Replace old repo contents with new repo contents

3 years ago · c9779bf766
--- a/.gitignore
+++ b/.gitignore
@ -1,5 +0,0 @@
 CMakeFiles
 cmake_install.cmake
 CMakeCache.txt
 Makefile
 tags
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@ -1,97 +1,122 @@
 # Prevent in-source builds
 if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
 	message(FATAL_ERROR "In-source builds prohibited. Call cmake from the build directory.")
 endif()

 cmake_minimum_required(VERSION 3.7)

 # Set compiler flags
 if(CMAKE_COMPILER_IS_GNUCC)
 	set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -g")
 	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3")
 elseif(MSVC)
 	set(CMAKE_CXX_FLAGS "/W3 /MP /MD")
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS}")
 	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} /Ox")
 endif()

 # Include project macro
 include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/project.cmake)

 # Find dependency packages
 find_package(emergent REQUIRED CONFIG)
 find_package(OpenAL REQUIRED CONFIG)

 # Determine dependencies
 set(STATIC_LIBS
 	emergent)
 set(SHARED_LIBS
 	OpenAL::OpenAL)

 # Generate configuration header file
 configure_file(${PROJECT_SOURCE_DIR}/src/configuration.hpp.in
 	${PROJECT_BINARY_DIR}/src/configuration.hpp)

 # Collect source files
 file(GLOB_RECURSE SOURCE_FILES
 	${PROJECT_SOURCE_DIR}/src/*.cpp)

 # Make DPI-aware on Windows
 if(MSVC)
 	list(APPEND SOURCE_FILES "${PROJECT_SOURCE_DIR}/src/dpi-aware.manifest")
 endif()

 # Add executable target
 set(EXECUTABLE_TARGET ${PROJECT_NAME}-executable)
 add_executable(${EXECUTABLE_TARGET} ${SOURCE_FILES})
 set_target_properties(${EXECUTABLE_TARGET} PROPERTIES OUTPUT_NAME ${PROJECT_NAME})

 # Add compile definitions
 if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 	target_compile_definitions(${EXECUTABLE_TARGET} PRIVATE DEBUG)
 else()
 	target_compile_definitions(${EXECUTABLE_TARGET} PRIVATE NDEBUG)
 endif()

 # Set C++17 standard
 set_target_properties(${EXECUTABLE_TARGET} PROPERTIES
 	CXX_STANDARD 17
 	CXX_EXTENSIONS OFF)
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES COMPILE_FLAGS "-std=c++17")
 elseif(MSVC)
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES COMPILE_FLAGS "/std:c++17")
 endif()

 # Set link flags to show console window on debug builds and hide it on release builds
 if(MSVC)
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:CONSOLE")
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS /ENTRY:\"mainCRTStartup\"")
 endif(MSVC)

 # Set include directories
 target_include_directories(${EXECUTABLE_TARGET}
 	PUBLIC
 	${PROJECT_SOURCE_DIR}/src
 	${PROJECT_BINARY_DIR}/src)

 # Link to dependencies
 target_link_libraries(${EXECUTABLE_TARGET} ${STATIC_LIBS} ${SHARED_LIBS})

 # Install executable
 if(PACKAGE_PLATFORM MATCHES "linux")
 	install(TARGETS ${EXECUTABLE_TARGET} DESTINATION bin)
 elseif(PACKAGE_PLATFORM MATCHES "win")
 	# Install executable
 	install(TARGETS ${EXECUTABLE_TARGET} DESTINATION .)
 	
 	# Install OpenAL DLL
 	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 		get_target_property(OPENAL_DLL OpenAL::OpenAL IMPORTED_LOCATION_DEBUG)
 	else()
 		get_target_property(OPENAL_DLL OpenAL::OpenAL IMPORTED_LOCATION_RELEASE)
 	endif()
 	
 	install(FILES ${OPENAL_DLL} DESTINATION .)
 endif()
 # Prevent in-source builds
 if(${CMAKE_SOURCE_DIR} STREQUAL ${CMAKE_BINARY_DIR})
 	message(FATAL_ERROR "In-source builds prohibited. Call cmake from the build directory.")
 endif()

 cmake_minimum_required(VERSION 3.7)

 # Include project macro
 include(${CMAKE_CURRENT_SOURCE_DIR}/cmake/project.cmake)

 # Set compiler flags
 if(CMAKE_COMPILER_IS_GNUCC)
 	set(CMAKE_CXX_FLAGS "-Wall -Wextra")
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS} -g")
 	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} -O3")
 elseif(MSVC)
 	set(CMAKE_CXX_FLAGS "/W3 /MP /MD")
 	set(CMAKE_CXX_FLAGS_DEBUG "${CMAKE_CXX_FLAGS}")
 	set(CMAKE_CXX_FLAGS_RELEASE "${CMAKE_CXX_FLAGS} /Ox")
 endif()


 # Find dependency packages
 find_package(vmq REQUIRED CONFIG)
 find_package(EnTT REQUIRED CONFIG)
 find_package(OpenGL REQUIRED)
 find_package(SDL2 REQUIRED COMPONENTS SDL2::SDL2-static SDL2::SDL2main CONFIG)
 find_package(OpenAL REQUIRED CONFIG)

 # Determine dependencies
 set(STATIC_LIBS
 	vmq
 	EnTT
 	SDL2::SDL2main)
 set(SHARED_LIBS
 	${OPENGL_gl_LIBRARY}
 	SDL2::SDL2
 	OpenAL::OpenAL)

 # Generate configuration header file
 configure_file(${PROJECT_SOURCE_DIR}/src/antkeeper/configuration.hpp.in
 	${PROJECT_BINARY_DIR}/src/antkeeper/configuration.hpp)

 # Collect source files
 file(GLOB_RECURSE SOURCE_FILES
 	${PROJECT_SOURCE_DIR}/src/*.cpp
 	${PROJECT_SOURCE_DIR}/src/*.c)

 if(MSVC)
 	# Generate Windows icon resource file
 	set(ICON_FILE "${PROJECT_SOURCE_DIR}/../antkeeper-data/src/icons/antkeeper.ico")
 	configure_file(${PROJECT_SOURCE_DIR}/src/antkeeper/platform/windows/icon.rc.in
 		${PROJECT_BINARY_DIR}/src/antkeeper/platform/windows/icon.rc)
 	
 	# Add executable icon
 	list(APPEND SOURCE_FILES "${PROJECT_BINARY_DIR}/src/antkeeper/platform/windows/icon.rc")
 	
 	# Make DPI-aware on Windows
 	list(APPEND SOURCE_FILES "${PROJECT_SOURCE_DIR}/src/antkeeper/platform/windows/dpi-aware.manifest")
 endif()

 # Add executable target
 set(EXECUTABLE_TARGET ${PROJECT_NAME}-executable)
 add_executable(${EXECUTABLE_TARGET} ${SOURCE_FILES})
 set_target_properties(${EXECUTABLE_TARGET} PROPERTIES OUTPUT_NAME ${PROJECT_NAME})

 # Add compile definitions
 if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 	target_compile_definitions(${EXECUTABLE_TARGET} PRIVATE DEBUG)
 else()
 	target_compile_definitions(${EXECUTABLE_TARGET} PRIVATE NDEBUG)
 endif()

 # Set C++17 standard
 set_target_properties(${EXECUTABLE_TARGET} PROPERTIES
 	CXX_STANDARD 17
 	CXX_EXTENSIONS OFF)
 if(CMAKE_CXX_COMPILER_ID STREQUAL "GNU")
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES COMPILE_FLAGS "-std=c++17")
 elseif(MSVC)
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES COMPILE_FLAGS "/std:c++17")
 endif()

 # Set link flags to show console window on debug builds and hide it on release builds
 if(MSVC)
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES LINK_FLAGS_DEBUG "/SUBSYSTEM:CONSOLE")
 	set_target_properties(${EXECUTABLE_TARGET} PROPERTIES LINK_FLAGS_RELEASE "/SUBSYSTEM:WINDOWS /ENTRY:\"mainCRTStartup\"")
 endif(MSVC)

 # Set include directories
 target_include_directories(${EXECUTABLE_TARGET}
 	PUBLIC
 		${PROJECT_SOURCE_DIR}/src
 		${PROJECT_SOURCE_DIR}/src/antkeeper
 		${PROJECT_BINARY_DIR}/src/antkeeper)

 # Link to dependencies
 target_link_libraries(${EXECUTABLE_TARGET} ${STATIC_LIBS} ${SHARED_LIBS})

 # Install executable
 if(PACKAGE_PLATFORM MATCHES "linux")
 	install(TARGETS ${EXECUTABLE_TARGET} DESTINATION bin)
 elseif(PACKAGE_PLATFORM MATCHES "win")
 	# Install executable
 	install(TARGETS ${EXECUTABLE_TARGET} DESTINATION .)

 	# Install SDL2 DLLs
 	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 		get_target_property(SDL2_DLL SDL2::SDL2 IMPORTED_LOCATION_DEBUG)
 	else()
 		get_target_property(SDL2_DLL SDL2::SDL2 IMPORTED_LOCATION_RELEASE)
 	endif()
 	install(FILES ${SDL2_DLL} DESTINATION .)
 	
 	# Install OpenAL DLL
 	if(CMAKE_BUILD_TYPE STREQUAL "Debug")
 		get_target_property(OPENAL_DLL OpenAL::OpenAL IMPORTED_LOCATION_DEBUG)
 	else()
 		get_target_property(OPENAL_DLL OpenAL::OpenAL IMPORTED_LOCATION_RELEASE)
 	endif()
 	install(FILES ${OPENAL_DLL} DESTINATION .)
 endif()
--- a/+ 0
+++ b/+ 0
@ -1,674 +0,0 @@
                    GNU GENERAL PUBLIC LICENSE
                       Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc. <http://fsf.org/>
 Everyone is permitted to copy and distribute verbatim copies
 of this license document, but changing it is not allowed.

                            Preamble

  The GNU General Public License is a free, copyleft license for
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 not accept this License.  Therefore, by modifying or propagating a
 covered work, you indicate your acceptance of this License to do so.

  10. Automatic Licensing of Downstream Recipients.

  Each time you convey a covered work, the recipient automatically
 receives a license from the original licensors, to run, modify and
 propagate that work, subject to this License.  You are not responsible
 for enforcing compliance by third parties with this License.

  An "entity transaction" is a transaction transferring control of an
 organization, or substantially all assets of one, or subdividing an
 organization, or merging organizations.  If propagation of a covered
 work results from an entity transaction, each party to that
 transaction who receives a copy of the work also receives whatever
 licenses to the work the party's predecessor in interest had or could
 give under the previous paragraph, plus a right to possession of the
 Corresponding Source of the work from the predecessor in interest, if
 the predecessor has it or can get it with reasonable efforts.

  You may not impose any further restrictions on the exercise of the
 rights granted or affirmed under this License.  For example, you may
 not impose a license fee, royalty, or other charge for exercise of
 rights granted under this License, and you may not initiate litigation
 (including a cross-claim or counterclaim in a lawsuit) alleging that
 any patent claim is infringed by making, using, selling, offering for
 sale, or importing the Program or any portion of it.

  11. Patents.

  A "contributor" is a copyright holder who authorizes use under this
 License of the Program or a work on which the Program is based.  The
 work thus licensed is called the contributor's "contributor version".

  A contributor's "essential patent claims" are all patent claims
 owned or controlled by the contributor, whether already acquired or
 hereafter acquired, that would be infringed by some manner, permitted
 by this License, of making, using, or selling its contributor version,
 but do not include claims that would be infringed only as a
 consequence of further modification of the contributor version.  For
 purposes of this definition, "control" includes the right to grant
 patent sublicenses in a manner consistent with the requirements of
 this License.

  Each contributor grants you a non-exclusive, worldwide, royalty-free
 patent license under the contributor's essential patent claims, to
 make, use, sell, offer for sale, import and otherwise run, modify and
 propagate the contents of its contributor version.

  In the following three paragraphs, a "patent license" is any express
 agreement or commitment, however denominated, not to enforce a patent
 (such as an express permission to practice a patent or covenant not to
 sue for patent infringement).  To "grant" such a patent license to a
 party means to make such an agreement or commitment not to enforce a
 patent against the party.

  If you convey a covered work, knowingly relying on a patent license,
 and the Corresponding Source of the work is not available for anyone
 to copy, free of charge and under the terms of this License, through a
 publicly available network server or other readily accessible means,
 then you must either (1) cause the Corresponding Source to be so
 available, or (2) arrange to deprive yourself of the benefit of the
 patent license for this particular work, or (3) arrange, in a manner
 consistent with the requirements of this License, to extend the patent
 license to downstream recipients.  "Knowingly relying" means you have
 actual knowledge that, but for the patent license, your conveying the
 covered work in a country, or your recipient's use of the covered work
 in a country, would infringe one or more identifiable patents in that
 country that you have reason to believe are valid.

  If, pursuant to or in connection with a single transaction or
 arrangement, you convey, or propagate by procuring conveyance of, a
 covered work, and grant a patent license to some of the parties
 receiving the covered work authorizing them to use, propagate, modify
 or convey a specific copy of the covered work, then the patent license
 you grant is automatically extended to all recipients of the covered
 work and works based on it.

  A patent license is "discriminatory" if it does not include within
 the scope of its coverage, prohibits the exercise of, or is
 conditioned on the non-exercise of one or more of the rights that are
 specifically granted under this License.  You may not convey a covered
 work if you are a party to an arrangement with a third party that is
 in the business of distributing software, under which you make payment
 to the third party based on the extent of your activity of conveying
 the work, and under which the third party grants, to any of the
 parties who would receive the covered work from you, a discriminatory
 patent license (a) in connection with copies of the covered work
 conveyed by you (or copies made from those copies), or (b) primarily
 for and in connection with specific products or compilations that
 contain the covered work, unless you entered into that arrangement,
 or that patent license was granted, prior to 28 March 2007.

  Nothing in this License shall be construed as excluding or limiting
 any implied license or other defenses to infringement that may
 otherwise be available to you under applicable patent law.

  12. No Surrender of Others' Freedom.

  If conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License.  If you cannot convey a
 covered work so as to satisfy simultaneously your obligations under this
 License and any other pertinent obligations, then as a consequence you may
 not convey it at all.  For example, if you agree to terms that obligate you
 to collect a royalty for further conveying from those to whom you convey
 the Program, the only way you could satisfy both those terms and this
 License would be to refrain entirely from conveying the Program.

  13. Use with the GNU Affero General Public License.

  Notwithstanding any other provision of this License, you have
 permission to link or combine any covered work with a work licensed
 under version 3 of the GNU Affero General Public License into a single
 combined work, and to convey the resulting work.  The terms of this
 License will continue to apply to the part which is the covered work,
 but the special requirements of the GNU Affero General Public License,
 section 13, concerning interaction through a network will apply to the
 combination as such.

  14. Revised Versions of this License.

  The Free Software Foundation may publish revised and/or new versions of
 the GNU General Public License from time to time.  Such new versions will
 be similar in spirit to the present version, but may differ in detail to
 address new problems or concerns.

  Each version is given a distinguishing version number.  If the
 Program specifies that a certain numbered version of the GNU General
 Public License "or any later version" applies to it, you have the
 option of following the terms and conditions either of that numbered
 version or of any later version published by the Free Software
 Foundation.  If the Program does not specify a version number of the
 GNU General Public License, you may choose any version ever published
 by the Free Software Foundation.

  If the Program specifies that a proxy can decide which future
 versions of the GNU General Public License can be used, that proxy's
 public statement of acceptance of a version permanently authorizes you
 to choose that version for the Program.

  Later license versions may give you additional or different
 permissions.  However, no additional obligations are imposed on any
 author or copyright holder as a result of your choosing to follow a
 later version.

  15. Disclaimer of Warranty.

  THERE IS NO WARRANTY FOR THE PROGRAM, TO THE EXTENT PERMITTED BY
 APPLICABLE LAW.  EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT WARRANTY
 OF ANY KIND, EITHER EXPRESSED OR IMPLIED, INCLUDING, BUT NOT LIMITED TO,
 THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 PURPOSE.  THE ENTIRE RISK AS TO THE QUALITY AND PERFORMANCE OF THE PROGRAM
 IS WITH YOU.  SHOULD THE PROGRAM PROVE DEFECTIVE, YOU ASSUME THE COST OF
 ALL NECESSARY SERVICING, REPAIR OR CORRECTION.

  16. Limitation of Liability.

  IN NO EVENT UNLESS REQUIRED BY APPLICABLE LAW OR AGREED TO IN WRITING
 WILL ANY COPYRIGHT HOLDER, OR ANY OTHER PARTY WHO MODIFIES AND/OR CONVEYS
 THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES, INCLUDING ANY
 GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES ARISING OUT OF THE
 USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT NOT LIMITED TO LOSS OF
 DATA OR DATA BEING RENDERED INACCURATE OR LOSSES SUSTAINED BY YOU OR THIRD
 PARTIES OR A FAILURE OF THE PROGRAM TO OPERATE WITH ANY OTHER PROGRAMS),
 EVEN IF SUCH HOLDER OR OTHER PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF
 SUCH DAMAGES.

  17. Interpretation of Sections 15 and 16.

  If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
 copy of the Program in return for a fee.

                     END OF TERMS AND CONDITIONS

            How to Apply These Terms to Your New Programs

  If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these terms.

  To do so, attach the following notices to the program.  It is safest
 to attach them to the start of each source file to most effectively
 state the exclusion of warranty; and each file should have at least
 the "copyright" line and a pointer to where the full notice is found.

    <one line to give the program's name and a brief idea of what it does.>
    Copyright (C) <year>  <name of author>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.

 Also add information on how to contact you by electronic and paper mail.

  If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:

    <program>  Copyright (C) <year>  <name of author>
    This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
    This is free software, and you are welcome to redistribute it
    under certain conditions; type `show c' for details.

 The hypothetical commands `show w' and `show c' should show the appropriate
 parts of the General Public License.  Of course, your program's commands
 might be different; for a GUI interface, you would use an "about box".

  You should also get your employer (if you work as a programmer) or school,
 if any, to sign a "copyright disclaimer" for the program, if necessary.
 For more information on this, and how to apply and follow the GNU GPL, see
 <http://www.gnu.org/licenses/>.

  The GNU General Public License does not permit incorporating your program
 into proprietary programs.  If your program is a subroutine library, you
 may consider it more useful to permit linking proprietary applications with
 the library.  If this is what you want to do, use the GNU Lesser General
 Public License instead of this License.  But first, please read
 <http://www.gnu.org/philosophy/why-not-lgpl.html>.
--- a/LICENSE.md
+++ b/LICENSE.md
@ -0,0 +1,675 @@
 ### GNU GENERAL PUBLIC LICENSE

 Version 3, 29 June 2007

 Copyright (C) 2007 Free Software Foundation, Inc.
 <https://fsf.org/>

 Everyone is permitted to copy and distribute verbatim copies of this
 license document, but changing it is not allowed.

 ### Preamble

 The GNU General Public License is a free, copyleft license for
 software and other kinds of works.

 The licenses for most software and other practical works are designed
 to take away your freedom to share and change the works. By contrast,
 the GNU General Public License is intended to guarantee your freedom
 to share and change all versions of a program--to make sure it remains
 free software for all its users. We, the Free Software Foundation, use
 the GNU General Public License for most of our software; it applies
 also to any other work released this way by its authors. You can apply
 it to your programs, too.

 When we speak of free software, we are referring to freedom, not
 price. Our General Public Licenses are designed to make sure that you
 have the freedom to distribute copies of free software (and charge for
 them if you wish), that you receive source code or can get it if you
 want it, that you can change the software or use pieces of it in new
 free programs, and that you know you can do these things.

 To protect your rights, we need to prevent others from denying you
 these rights or asking you to surrender the rights. Therefore, you
 have certain responsibilities if you distribute copies of the
 software, or if you modify it: responsibilities to respect the freedom
 of others.

 For example, if you distribute copies of such a program, whether
 gratis or for a fee, you must pass on to the recipients the same
 freedoms that you received. You must make sure that they, too, receive
 or can get the source code. And you must show them these terms so they
 know their rights.

 Developers that use the GNU GPL protect your rights with two steps:
 (1) assert copyright on the software, and (2) offer you this License
 giving you legal permission to copy, distribute and/or modify it.

 For the developers' and authors' protection, the GPL clearly explains
 that there is no warranty for this free software. For both users' and
 authors' sake, the GPL requires that modified versions be marked as
 changed, so that their problems will not be attributed erroneously to
 authors of previous versions.

 Some devices are designed to deny users access to install or run
 modified versions of the software inside them, although the
 manufacturer can do so. This is fundamentally incompatible with the
 aim of protecting users' freedom to change the software. The
 systematic pattern of such abuse occurs in the area of products for
 individuals to use, which is precisely where it is most unacceptable.
 Therefore, we have designed this version of the GPL to prohibit the
 practice for those products. If such problems arise substantially in
 other domains, we stand ready to extend this provision to those
 domains in future versions of the GPL, as needed to protect the
 freedom of users.

 Finally, every program is threatened constantly by software patents.
 States should not allow patents to restrict development and use of
 software on general-purpose computers, but in those that do, we wish
 to avoid the special danger that patents applied to a free program
 could make it effectively proprietary. To prevent this, the GPL
 assures that patents cannot be used to render the program non-free.

 The precise terms and conditions for copying, distribution and
 modification follow.

 ### TERMS AND CONDITIONS

 #### 0. Definitions.

 "This License" refers to version 3 of the GNU General Public License.

 "Copyright" also means copyright-like laws that apply to other kinds
 of works, such as semiconductor masks.

 "The Program" refers to any copyrightable work licensed under this
 License. Each licensee is addressed as "you". "Licensees" and
 "recipients" may be individuals or organizations.

 To "modify" a work means to copy from or adapt all or part of the work
 in a fashion requiring copyright permission, other than the making of
 an exact copy. The resulting work is called a "modified version" of
 the earlier work or a work "based on" the earlier work.

 A "covered work" means either the unmodified Program or a work based
 on the Program.

 To "propagate" a work means to do anything with it that, without
 permission, would make you directly or secondarily liable for
 infringement under applicable copyright law, except executing it on a
 computer or modifying a private copy. Propagation includes copying,
 distribution (with or without modification), making available to the
 public, and in some countries other activities as well.

 To "convey" a work means any kind of propagation that enables other
 parties to make or receive copies. Mere interaction with a user
 through a computer network, with no transfer of a copy, is not
 conveying.

 An interactive user interface displays "Appropriate Legal Notices" to
 the extent that it includes a convenient and prominently visible
 feature that (1) displays an appropriate copyright notice, and (2)
 tells the user that there is no warranty for the work (except to the
 extent that warranties are provided), that licensees may convey the
 work under this License, and how to view a copy of this License. If
 the interface presents a list of user commands or options, such as a
 menu, a prominent item in the list meets this criterion.

 #### 1. Source Code.

 The "source code" for a work means the preferred form of the work for
 making modifications to it. "Object code" means any non-source form of
 a work.

 A "Standard Interface" means an interface that either is an official
 standard defined by a recognized standards body, or, in the case of
 interfaces specified for a particular programming language, one that
 is widely used among developers working in that language.

 The "System Libraries" of an executable work include anything, other
 than the work as a whole, that (a) is included in the normal form of
 packaging a Major Component, but which is not part of that Major
 Component, and (b) serves only to enable use of the work with that
 Major Component, or to implement a Standard Interface for which an
 implementation is available to the public in source code form. A
 "Major Component", in this context, means a major essential component
 (kernel, window system, and so on) of the specific operating system
 (if any) on which the executable work runs, or a compiler used to
 produce the work, or an object code interpreter used to run it.

 The "Corresponding Source" for a work in object code form means all
 the source code needed to generate, install, and (for an executable
 work) run the object code and to modify the work, including scripts to
 control those activities. However, it does not include the work's
 System Libraries, or general-purpose tools or generally available free
 programs which are used unmodified in performing those activities but
 which are not part of the work. For example, Corresponding Source
 includes interface definition files associated with source files for
 the work, and the source code for shared libraries and dynamically
 linked subprograms that the work is specifically designed to require,
 such as by intimate data communication or control flow between those
 subprograms and other parts of the work.

 The Corresponding Source need not include anything that users can
 regenerate automatically from other parts of the Corresponding Source.

 The Corresponding Source for a work in source code form is that same
 work.

 #### 2. Basic Permissions.

 All rights granted under this License are granted for the term of
 copyright on the Program, and are irrevocable provided the stated
 conditions are met. This License explicitly affirms your unlimited
 permission to run the unmodified Program. The output from running a
 covered work is covered by this License only if the output, given its
 content, constitutes a covered work. This License acknowledges your
 rights of fair use or other equivalent, as provided by copyright law.

 You may make, run and propagate covered works that you do not convey,
 without conditions so long as your license otherwise remains in force.
 You may convey covered works to others for the sole purpose of having
 them make modifications exclusively for you, or provide you with
 facilities for running those works, provided that you comply with the
 terms of this License in conveying all material for which you do not
 control copyright. Those thus making or running the covered works for
 you must do so exclusively on your behalf, under your direction and
 control, on terms that prohibit them from making any copies of your
 copyrighted material outside their relationship with you.

 Conveying under any other circumstances is permitted solely under the
 conditions stated below. Sublicensing is not allowed; section 10 makes
 it unnecessary.

 #### 3. Protecting Users' Legal Rights From Anti-Circumvention Law.

 No covered work shall be deemed part of an effective technological
 measure under any applicable law fulfilling obligations under article
 11 of the WIPO copyright treaty adopted on 20 December 1996, or
 similar laws prohibiting or restricting circumvention of such
 measures.

 When you convey a covered work, you waive any legal power to forbid
 circumvention of technological measures to the extent such
 circumvention is effected by exercising rights under this License with
 respect to the covered work, and you disclaim any intention to limit
 operation or modification of the work as a means of enforcing, against
 the work's users, your or third parties' legal rights to forbid
 circumvention of technological measures.

 #### 4. Conveying Verbatim Copies.

 You may convey verbatim copies of the Program's source code as you
 receive it, in any medium, provided that you conspicuously and
 appropriately publish on each copy an appropriate copyright notice;
 keep intact all notices stating that this License and any
 non-permissive terms added in accord with section 7 apply to the code;
 keep intact all notices of the absence of any warranty; and give all
 recipients a copy of this License along with the Program.

 You may charge any price or no price for each copy that you convey,
 and you may offer support or warranty protection for a fee.

 #### 5. Conveying Modified Source Versions.

 You may convey a work based on the Program, or the modifications to
 produce it from the Program, in the form of source code under the
 terms of section 4, provided that you also meet all of these
 conditions:

 -   a) The work must carry prominent notices stating that you modified
    it, and giving a relevant date.
 -   b) The work must carry prominent notices stating that it is
    released under this License and any conditions added under
    section 7. This requirement modifies the requirement in section 4
    to "keep intact all notices".
 -   c) You must license the entire work, as a whole, under this
    License to anyone who comes into possession of a copy. This
    License will therefore apply, along with any applicable section 7
    additional terms, to the whole of the work, and all its parts,
    regardless of how they are packaged. This License gives no
    permission to license the work in any other way, but it does not
    invalidate such permission if you have separately received it.
 -   d) If the work has interactive user interfaces, each must display
    Appropriate Legal Notices; however, if the Program has interactive
    interfaces that do not display Appropriate Legal Notices, your
    work need not make them do so.

 A compilation of a covered work with other separate and independent
 works, which are not by their nature extensions of the covered work,
 and which are not combined with it such as to form a larger program,
 in or on a volume of a storage or distribution medium, is called an
 "aggregate" if the compilation and its resulting copyright are not
 used to limit the access or legal rights of the compilation's users
 beyond what the individual works permit. Inclusion of a covered work
 in an aggregate does not cause this License to apply to the other
 parts of the aggregate.

 #### 6. Conveying Non-Source Forms.

 You may convey a covered work in object code form under the terms of
 sections 4 and 5, provided that you also convey the machine-readable
 Corresponding Source under the terms of this License, in one of these
 ways:

 -   a) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by the
    Corresponding Source fixed on a durable physical medium
    customarily used for software interchange.
 -   b) Convey the object code in, or embodied in, a physical product
    (including a physical distribution medium), accompanied by a
    written offer, valid for at least three years and valid for as
    long as you offer spare parts or customer support for that product
    model, to give anyone who possesses the object code either (1) a
    copy of the Corresponding Source for all the software in the
    product that is covered by this License, on a durable physical
    medium customarily used for software interchange, for a price no
    more than your reasonable cost of physically performing this
    conveying of source, or (2) access to copy the Corresponding
    Source from a network server at no charge.
 -   c) Convey individual copies of the object code with a copy of the
    written offer to provide the Corresponding Source. This
    alternative is allowed only occasionally and noncommercially, and
    only if you received the object code with such an offer, in accord
    with subsection 6b.
 -   d) Convey the object code by offering access from a designated
    place (gratis or for a charge), and offer equivalent access to the
    Corresponding Source in the same way through the same place at no
    further charge. You need not require recipients to copy the
    Corresponding Source along with the object code. If the place to
    copy the object code is a network server, the Corresponding Source
    may be on a different server (operated by you or a third party)
    that supports equivalent copying facilities, provided you maintain
    clear directions next to the object code saying where to find the
    Corresponding Source. Regardless of what server hosts the
    Corresponding Source, you remain obligated to ensure that it is
    available for as long as needed to satisfy these requirements.
 -   e) Convey the object code using peer-to-peer transmission,
    provided you inform other peers where the object code and
    Corresponding Source of the work are being offered to the general
    public at no charge under subsection 6d.

 A separable portion of the object code, whose source code is excluded
 from the Corresponding Source as a System Library, need not be
 included in conveying the object code work.

 A "User Product" is either (1) a "consumer product", which means any
 tangible personal property which is normally used for personal,
 family, or household purposes, or (2) anything designed or sold for
 incorporation into a dwelling. In determining whether a product is a
 consumer product, doubtful cases shall be resolved in favor of
 coverage. For a particular product received by a particular user,
 "normally used" refers to a typical or common use of that class of
 product, regardless of the status of the particular user or of the way
 in which the particular user actually uses, or expects or is expected
 to use, the product. A product is a consumer product regardless of
 whether the product has substantial commercial, industrial or
 non-consumer uses, unless such uses represent the only significant
 mode of use of the product.

 "Installation Information" for a User Product means any methods,
 procedures, authorization keys, or other information required to
 install and execute modified versions of a covered work in that User
 Product from a modified version of its Corresponding Source. The
 information must suffice to ensure that the continued functioning of
 the modified object code is in no case prevented or interfered with
 solely because modification has been made.

 If you convey an object code work under this section in, or with, or
 specifically for use in, a User Product, and the conveying occurs as
 part of a transaction in which the right of possession and use of the
 User Product is transferred to the recipient in perpetuity or for a
 fixed term (regardless of how the transaction is characterized), the
 Corresponding Source conveyed under this section must be accompanied
 by the Installation Information. But this requirement does not apply
 if neither you nor any third party retains the ability to install
 modified object code on the User Product (for example, the work has
 been installed in ROM).

 The requirement to provide Installation Information does not include a
 requirement to continue to provide support service, warranty, or
 updates for a work that has been modified or installed by the
 recipient, or for the User Product in which it has been modified or
 installed. Access to a network may be denied when the modification
 itself materially and adversely affects the operation of the network
 or violates the rules and protocols for communication across the
 network.

 Corresponding Source conveyed, and Installation Information provided,
 in accord with this section must be in a format that is publicly
 documented (and with an implementation available to the public in
 source code form), and must require no special password or key for
 unpacking, reading or copying.

 #### 7. Additional Terms.

 "Additional permissions" are terms that supplement the terms of this
 License by making exceptions from one or more of its conditions.
 Additional permissions that are applicable to the entire Program shall
 be treated as though they were included in this License, to the extent
 that they are valid under applicable law. If additional permissions
 apply only to part of the Program, that part may be used separately
 under those permissions, but the entire Program remains governed by
 this License without regard to the additional permissions.

 When you convey a copy of a covered work, you may at your option
 remove any additional permissions from that copy, or from any part of
 it. (Additional permissions may be written to require their own
 removal in certain cases when you modify the work.) You may place
 additional permissions on material, added by you to a covered work,
 for which you have or can give appropriate copyright permission.

 Notwithstanding any other provision of this License, for material you
 add to a covered work, you may (if authorized by the copyright holders
 of that material) supplement the terms of this License with terms:

 -   a) Disclaiming warranty or limiting liability differently from the
    terms of sections 15 and 16 of this License; or
 -   b) Requiring preservation of specified reasonable legal notices or
    author attributions in that material or in the Appropriate Legal
    Notices displayed by works containing it; or
 -   c) Prohibiting misrepresentation of the origin of that material,
    or requiring that modified versions of such material be marked in
    reasonable ways as different from the original version; or
 -   d) Limiting the use for publicity purposes of names of licensors
    or authors of the material; or
 -   e) Declining to grant rights under trademark law for use of some
    trade names, trademarks, or service marks; or
 -   f) Requiring indemnification of licensors and authors of that
    material by anyone who conveys the material (or modified versions
    of it) with contractual assumptions of liability to the recipient,
    for any liability that these contractual assumptions directly
    impose on those licensors and authors.

 All other non-permissive additional terms are considered "further
 restrictions" within the meaning of section 10. If the Program as you
 received it, or any part of it, contains a notice stating that it is
 governed by this License along with a term that is a further
 restriction, you may remove that term. If a license document contains
 a further restriction but permits relicensing or conveying under this
 License, you may add to a covered work material governed by the terms
 of that license document, provided that the further restriction does
 not survive such relicensing or conveying.

 If you add terms to a covered work in accord with this section, you
 must place, in the relevant source files, a statement of the
 additional terms that apply to those files, or a notice indicating
 where to find the applicable terms.

 Additional terms, permissive or non-permissive, may be stated in the
 form of a separately written license, or stated as exceptions; the
 above requirements apply either way.

 #### 8. Termination.

 You may not propagate or modify a covered work except as expressly
 provided under this License. Any attempt otherwise to propagate or
 modify it is void, and will automatically terminate your rights under
 this License (including any patent licenses granted under the third
 paragraph of section 11).

 However, if you cease all violation of this License, then your license
 from a particular copyright holder is reinstated (a) provisionally,
 unless and until the copyright holder explicitly and finally
 terminates your license, and (b) permanently, if the copyright holder
 fails to notify you of the violation by some reasonable means prior to
 60 days after the cessation.

 Moreover, your license from a particular copyright holder is
 reinstated permanently if the copyright holder notifies you of the
 violation by some reasonable means, this is the first time you have
 received notice of violation of this License (for any work) from that
 copyright holder, and you cure the violation prior to 30 days after
 your receipt of the notice.

 Termination of your rights under this section does not terminate the
 licenses of parties who have received copies or rights from you under
 this License. If your rights have been terminated and not permanently
 reinstated, you do not qualify to receive new licenses for the same
 material under section 10.

 #### 9. Acceptance Not Required for Having Copies.

 You are not required to accept this License in order to receive or run
 a copy of the Program. Ancillary propagation of a covered work
 occurring solely as a consequence of using peer-to-peer transmission
 to receive a copy likewise does not require acceptance. However,
 nothing other than this License grants you permission to propagate or
 modify any covered work. These actions infringe copyright if you do
 not accept this License. Therefore, by modifying or propagating a
 covered work, you indicate your acceptance of this License to do so.

 #### 10. Automatic Licensing of Downstream Recipients.

 Each time you convey a covered work, the recipient automatically
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 #### 11. Patents.

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 covered work, unless you entered into that arrangement, or that patent
 license was granted, prior to 28 March 2007.

 Nothing in this License shall be construed as excluding or limiting
 any implied license or other defenses to infringement that may
 otherwise be available to you under applicable patent law.

 #### 12. No Surrender of Others' Freedom.

 If conditions are imposed on you (whether by court order, agreement or
 otherwise) that contradict the conditions of this License, they do not
 excuse you from the conditions of this License. If you cannot convey a
 covered work so as to satisfy simultaneously your obligations under
 this License and any other pertinent obligations, then as a
 consequence you may not convey it at all. For example, if you agree to
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 from those to whom you convey the Program, the only way you could
 satisfy both those terms and this License would be to refrain entirely
 from conveying the Program.

 #### 13. Use with the GNU Affero General Public License.

 Notwithstanding any other provision of this License, you have
 permission to link or combine any covered work with a work licensed
 under version 3 of the GNU Affero General Public License into a single
 combined work, and to convey the resulting work. The terms of this
 License will continue to apply to the part which is the covered work,
 but the special requirements of the GNU Affero General Public License,
 section 13, concerning interaction through a network will apply to the
 combination as such.

 #### 14. Revised Versions of this License.

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 of the GNU General Public License from time to time. Such new versions
 will be similar in spirit to the present version, but may differ in
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 specifies that a certain numbered version of the GNU General Public
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 of the GNU General Public License can be used, that proxy's public
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 author or copyright holder as a result of your choosing to follow a
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 #### 15. Disclaimer of Warranty.

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 APPLICABLE LAW. EXCEPT WHEN OTHERWISE STATED IN WRITING THE COPYRIGHT
 HOLDERS AND/OR OTHER PARTIES PROVIDE THE PROGRAM "AS IS" WITHOUT
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 DEFECTIVE, YOU ASSUME THE COST OF ALL NECESSARY SERVICING, REPAIR OR
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 CONVEYS THE PROGRAM AS PERMITTED ABOVE, BE LIABLE TO YOU FOR DAMAGES,
 INCLUDING ANY GENERAL, SPECIAL, INCIDENTAL OR CONSEQUENTIAL DAMAGES
 ARISING OUT OF THE USE OR INABILITY TO USE THE PROGRAM (INCLUDING BUT
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 LOSSES SUSTAINED BY YOU OR THIRD PARTIES OR A FAILURE OF THE PROGRAM
 TO OPERATE WITH ANY OTHER PROGRAMS), EVEN IF SUCH HOLDER OR OTHER
 PARTY HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES.

 #### 17. Interpretation of Sections 15 and 16.

 If the disclaimer of warranty and limitation of liability provided
 above cannot be given local legal effect according to their terms,
 reviewing courts shall apply local law that most closely approximates
 an absolute waiver of all civil liability in connection with the
 Program, unless a warranty or assumption of liability accompanies a
 copy of the Program in return for a fee.

 END OF TERMS AND CONDITIONS

 ### How to Apply These Terms to Your New Programs

 If you develop a new program, and you want it to be of the greatest
 possible use to the public, the best way to achieve this is to make it
 free software which everyone can redistribute and change under these
 terms.

 To do so, attach the following notices to the program. It is safest to
 attach them to the start of each source file to most effectively state
 the exclusion of warranty; and each file should have at least the
 "copyright" line and a pointer to where the full notice is found.

        <one line to give the program's name and a brief idea of what it does.>
        Copyright (C) <year>  <name of author>

        This program is free software: you can redistribute it and/or modify
        it under the terms of the GNU General Public License as published by
        the Free Software Foundation, either version 3 of the License, or
        (at your option) any later version.

        This program is distributed in the hope that it will be useful,
        but WITHOUT ANY WARRANTY; without even the implied warranty of
        MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
        GNU General Public License for more details.

        You should have received a copy of the GNU General Public License
        along with this program.  If not, see <https://www.gnu.org/licenses/>.

 Also add information on how to contact you by electronic and paper
 mail.

 If the program does terminal interaction, make it output a short
 notice like this when it starts in an interactive mode:

        <program>  Copyright (C) <year>  <name of author>
        This program comes with ABSOLUTELY NO WARRANTY; for details type `show w'.
        This is free software, and you are welcome to redistribute it
        under certain conditions; type `show c' for details.

 The hypothetical commands \`show w' and \`show c' should show the
 appropriate parts of the General Public License. Of course, your
 program's commands might be different; for a GUI interface, you would
 use an "about box".

 You should also get your employer (if you work as a programmer) or
 school, if any, to sign a "copyright disclaimer" for the program, if
 necessary. For more information on this, and how to apply and follow
 the GNU GPL, see <https://www.gnu.org/licenses/>.

 The GNU General Public License does not permit incorporating your
 program into proprietary programs. If your program is a subroutine
 library, you may consider it more useful to permit linking proprietary
 applications with the library. If this is what you want to do, use the
 GNU Lesser General Public License instead of this License. But first,
 please read <https://www.gnu.org/licenses/why-not-lgpl.html>.
--- a/README.md
+++ b/README.md
@ -1,17 +1,54 @@
 # Antkeeper Source &middot; [![GitHub license](https://img.shields.io/github/license/cjhoward/antkeeper.svg)](https://github.com/cjhoward/antkeeper/blob/master/COPYING) [![GitHub release](https://img.shields.io/github/release/cjhoward/antkeeper.svg)](https://github.com/cjhoward/antkeeper/releases/)

 Antkeeper is an ant colony simulation game for Windows, Mac OS X, and GNU/Linux. This repository contains all of the source code to Antkeeper. The game data, however, is proprietary. You can access the game data by purchasing a copy of Antkeeper at [antkeeper.com](https://antkeeper.com/).

 ## License

 The source code for Antkeeper is licensed under the GNU General Public License, version 3. See [`COPYING`](./COPYING) for details.

 ### 3rd-Party Software

 | Name             | Author(s)    | License                     | Files |
 | :--------------- | :----------- | :-------------------------- | :---- |
 | dr_wav           | David Reid   | Public Domain               | [`dr_wav.h`](./src/dr_libs/dr_wav.h) |
 | Emergent         | C. J. Howard | GNU GPL v3.0                |       |
 | OpenAL soft      |              | GNU GPL v2.0                |       |
 | stb_image        | Sean Barrett | Public Domain / MIT License | [`stb_image.h`](./src/stb/stb_image.h) |
 | stb_image_writer | Sean Barrett | Public Domain / MIT License | [`stb_image_writer.h`](./src/stb/stb_image_writer.h) |
 # Antkeeper Source

 Antkeeper is an ant colony simulation game currently in development for Windows, Mac OS X, and GNU/Linux. This repository contains all of the source code to Antkeeper.

 Head over to [antkeeper.com](https://antkeeper.com/) if you're interested in following the development of the game or purchasing a copy when it's released. Antkeeper is an indie game with a single developer, so feel free to reach out to me personally with any questions, comments, or feedback you may have.

 ## Configuration & Building

 CMake is required to configure and build the application. Depending on the target build platform, CMake should be invoked from one of the following directories:

 	build/linux32 // 32-bit GNU/Linux application
 	build/linux64 // 64-bit GNU/Linux application
 	build/win32   // 32-bit Windows application
 	build/win64   // 64-bit Windows application

 The following arguments may be passed to CMake during configuration:

 	-DCMAKE_BUILD_TYPE // [Debug, Release]

 ### GNU/Linux

 Building on GNU/Linux requires CMake, GCC, G++, and GNU Make. Open a terminal in the project root directory and run the following commands:

 	cd build/linux64
 	cmake ../.. -G "Unix Makefiles" -DCMAKE_BUILD_TYPE=...
 	cmake --build .

 ### Windows

 Building on Windows requires CMake and Visual Studio. Additionally, [NSIS](http://nsis.sourceforge.net/) is required if you want to build a distributable installer program. In order to correctly build for your target architecture, you must use the `x86 Native Tools Command Prompt` or the `x64 Native Tools Command Prompt` for 32-bit and 64-bit applications, respectively. Then navigate to the project root directory and run the following commands:

 	cd build\win64
 	cmake ..\.. -G "NMake Makefiles" -DCMAKE_BUILD_TYPE=...
 	cmake --build .

 ## License

 Antkeeper source code is licensed under the GNU General Public License, version 3. For more information, see [LICENSE.md](./LICENSE.md).

 ### 3rd-Party Software

 | Name                            | Author(s)              | License                     | File(s)                                                  |
 | :------------------------------ | :--------------------- | :-------------------------- | :------------------------------------------------------- |
 | dr_wav                          | David Reid             | Public Domain (Unlicense)   | [dr_wav.h](./src/dr_libs/dr_wav.h)                       |
 | Easing Functions (Equations)    | Robert Penner          | MIT License                 | [easings.hpp](./src/antkeeper/animation/easings.hpp)     |
 | EnTT                            | Michele Caini          | MIT License                 | *Not included in repository*                             |
 | khrplatform.h                   | The Khronos Group Inc. | MIT License                 | [khrplatform.h](./src/glad/khrplatform.h)                |
 | OpenGL loader generated by glad | David Herberth         | Public Domain / WTFPL / CC0 | [glad.h](./src/glad/glad.h), [glad.c](./src/glad/glad.c) |
 | JSON for Modern C++             | Niels Lohmann          | MIT License                 | [json.hpp](./src/nlohmann/json.hpp)                      |
 | OpenAL Soft                     |                        | GNU GPL v2.0                | *Not included in repository*                             |
 | Simple DirectMedia Layer        | Sam Lantinga           | zlib License                | *Not included in repository*                             |
 | stb_image                       | Sean Barrett           | Public Domain / MIT License | [stb_image.h](./src/stb/stb_image.h)                     |
 | stb_image_write                 | Sean Barrett           | Public Domain / MIT License | [stb_image_write.h](./src/stb/stb_image_writer.h)        |

--- a/build/.gitignore
+++ b/build/.gitignore
@ -1,2 +1,2 @@
 *
 !.gitignore
 !.gitignore
--- a/src/antkeeper/animation/animation.cpp
+++ b/src/antkeeper/animation/animation.cpp
@ -1,27 +1,29 @@
 /*
 * Copyright (C) 2017-2019  Christopher J. Howard
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 * This file is part of Antkeeper source code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "game-state.hpp"
 #include "animation.hpp"

 GameState::GameState(Game* game):
 	game(game)
 void animation_base::animate(float dt)
 {}

 GameState::~GameState()
 {}
 void animator::animate(float dt)
 {

 }

--- a/src/antkeeper/animation/animation.hpp
+++ b/src/antkeeper/animation/animation.hpp
@ -0,0 +1,64 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ANIMATION_HPP
 #define ANTKEEPER_ANIMATION_HPP

 #include <functional>

 class animation_base
 {
 public:
 	void animate(float dt);
 };

 template <typename T>
 class animation: public animation_base
 {
 public:
 	void set_start_callback(std::function<void()> callback);
 	void set_end_callback(std::function<void()> callback);
 	void set_loop_callback(std::function<void()> callback);
 	void set_frame_callback(std::function<void(std::size_t, const T&)> callback);

 private:
 	std::function<void()> start_callback;
 	std::function<void()> end_callback;
 	std::function<void()> loop_callback;
 	std::function<void(std::size_t, const T&)> motion_callback;
 };

 class skeletal_animation: public animation<int>
 {

 };

 class animator
 {
 public:
 	/**
 	 * Progresses all active animations by @p dt.
 	 *
 	 * @param dt Delta time by which the animations will be progressed.
 	 */
 	void animate(float dt);
 };

 #endif // ANTKEEPER_ANIMATION_HPP

--- a/src/antkeeper/animation/easings.hpp
+++ b/src/antkeeper/animation/easings.hpp
@ -0,0 +1,284 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 /*
 * Easing Functions (Equations)
 *
 * Copyright (C) 2001 Robert Penner
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 * * Redistributions of source code must retain the above copyright notice, this
 *   list of conditions and the following disclaimer.
 *
 * * Redistributions in binary form must reproduce the above copyright notice,
 *   this list of conditions and the following disclaimer in the documentation
 *   and/or other materials provided with the distribution.
 *
 * * Neither the name of the author nor the names of contributors may be used to
 *   endorse or promote products derived from this software without specific
 *   prior written permission.

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
 * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

 #ifndef ANTKEEPER_EASINGS_HPP
 #define ANTKEEPER_EASINGS_HPP

 #include <vmq/vmq.hpp>
 #include <cmath>

 template <typename T>
 inline T ease_linear(const T& x, const T& y, float a)
 {
 	return (y - x) * a + x;
 }

 template <typename T>
 T ease_in_sine(const T& x, const T& y, float a)
 {
 	return -(y - x) * std::cos(a * vmq::half_pi<float>) + (y - x) + x;
 }

 template <typename T>
 T ease_out_sine(const T& x, const T& y, float a)
 {
 	return (y - x) * std::sin(a * vmq::half_pi<float>) + x;
 }

 template <typename T>
 T ease_in_out_sine(const T& x, const T& y, float a)
 {
 	return -(y - x) * 0.5f * (std::cos(vmq::pi<float> * a) - 1.0f) + x;
 }

 template <typename T>
 T ease_in_quad(const T& x, const T& y, float a)
 {
 	return (y - x) * a * a + x;
 }

 template <typename T>
 T ease_out_quad(const T& x, const T& y, float a)
 {
 	return -(y - x) * a * (a - 2.0f) + x;
 }

 template <typename T>
 T ease_in_out_quad(const T& x, const T& y, float a)
 {
 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * a * a + x;
 	}

 	a -= 1.0f;
 	return -(y - x) * 0.5f * (a * (a - 2.0f) - 1.0f) + x;
 }

 template <typename T>
 T ease_in_cubic(const T& x, const T& y, float a)
 {
 	return (y - x) * a * a * a + x;
 }

 template <typename T>
 T ease_out_cubic(const T& x, const T& y, float a)
 {
 	a -= 1.0f;
 	return (y - x) * (a * a * a + 1.0f) + x;
 }

 template <typename T>
 T ease_in_out_cubic(const T& x, const T& y, float a)
 {
 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * a * a * a + x;
 	}
 	
 	a -= 2.0f;
 	return (y - x) * 0.5f * (a * a * a + 2.0f) + x;
 }

 template <typename T>
 T ease_in_quart(const T& x, const T& y, float a)
 {
 	return (y - x) * a * a * a * a + x;
 }

 template <typename T>
 T ease_out_quart(const T& x, const T& y, float a)
 {
 	a -= 1.0f;
 	return -(y - x) * (a * a * a * a - 1.0f) + x;
 }

 template <typename T>
 T ease_in_out_quart(const T& x, const T& y, float a)
 {
 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * a * a * a * a + x;
 	}
 	
 	a -= 2.0f;
 	return -(y - x) * 0.5f * (a * a * a * a - 2.0f) + x;
 }

 template <typename T>
 T ease_in_quint(const T& x, const T& y, float a)
 {
 	return (y - x) * a * a * a * a * a + x;
 }

 template <typename T>
 T ease_out_quint(const T& x, const T& y, float a)
 {
 	a -= 1.0f;
 	return (y - x) * (a * a * a * a * a + 1.0f) + x;
 }

 template <typename T>
 T ease_in_out_quint(const T& x, const T& y, float a)
 {
 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * a * a * a * a * a + x;
 	}
 	
 	a -= 2.0f;
 	return (y - x) * 0.5f * (a * a * a * a * a + 2.0f) + x;
 }

 template <typename T>
 T ease_in_expo(const T& x, const T& y, float a)
 {
 	if (a == 0.0f)
 	{
 		return x;
 	}

 	return (y - x) * std::pow(2.0f, 10.0f * (a - 1.0f)) + x;
 }

 template <typename T>
 T ease_out_expo(const T& x, const T& y, float a)
 {
 	if (a == 1.0f)
 	{
 		return y;
 	}

 	return (y - x) * (-std::pow(2.0f, -10.0f * a) + 1.0f) + x;
 }

 template <typename T>
 T ease_in_out_expo(const T& x, const T& y, float a)
 {
 	if (a == 0.0f)
 	{
 		return x;
 	}
 	else if (a == 1.0f)
 	{
 		return y;
 	}

 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * std::pow(2.0f, 10.0f * (a - 1.0f)) + x;
 	}

 	a -= 1.0f;
 	return (y - x) * 0.5f * (-std::pow(2.0f, -10.0f * a) + 2.0f) + x;
 }

 template <typename T>
 T ease_in_circ(const T& x, const T& y, float a)
 {
 	return -(y - x) * (std::sqrt(1.0f - a * a) - 1.0f) + x;
 }

 template <typename T>
 T ease_out_circ(const T& x, const T& y, float a)
 {
 	a -= 1.0f;
 	return (y - x) * std::sqrt(1.0f - a * a) + x;
 }

 template <typename T>
 T ease_in_out_circ(const T& x, const T& y, float a)
 {
 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return -(y - x) * 0.5f * (std::sqrt(1.0f - a * a) - 1.0f) + x;
 	}
 	
 	a -= 2.0f;
 	return (y - x) * 0.5f * (std::sqrt(1.0f - a * a) + 1.0f) + x;
 }

 template <typename T>
 T ease_in_back(const T& x, const T& y, float a)
 {
 	const float s = 1.70158f;
 	return (y - x) * a * a * ((s + 1.0f) * a - s) + x;
 }

 template <typename T>
 T ease_out_back(const T& x, const T& y, float a)
 {
 	const float s = 1.70158f;
 	a -= 1.0f;
 	return (y - x) * (a * a * ((s + 1.0f) * a + s) + 1.0f) + x;
 }

 template <typename T>
 T ease_in_out_back(const T& x, const T& y, float a)
 {
 	const float s = 1.70158f * 1.525f;

 	a *= 2.0f;
 	if (a < 1.0f)
 	{
 		return (y - x) * 0.5f * (a * a * ((s + 1.0f) * a - s)) + x;
 	}

 	a -= 2.0f;
 	return (y - x) * 0.5f * (a * a * ((s + 1.0f) * a + s) + 2.0f) + x;
 }

 #endif // ANTKEEPER_EASINGS_HPP
--- a/src/antkeeper/animation/timeline.cpp
+++ b/src/antkeeper/animation/timeline.cpp
@ -0,0 +1,112 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "timeline.hpp"

 auto cue_compare = [](const cue& a, const cue& b)
 {
 	return std::get<0>(a) < std::get<0>(b);
 };

 timeline::timeline():
 	cues(cue_compare),
 	position(0.0f),
 	autoremove(false)
 {}

 void timeline::advance(float dt)
 {
 	auto lower_bound = cues.lower_bound({position, nullptr});
 	auto upper_bound = cues.upper_bound({position + dt, nullptr});

 	for (auto iterator = lower_bound; iterator != upper_bound; ++iterator)
 	{
 		std::get<1>(*iterator)();
 	}

 	if (autoremove && lower_bound != upper_bound)
 	{
 		cues.erase(lower_bound, upper_bound);
 	}

 	position += dt;
 }

 void timeline::seek(float t)
 {
 	position = t;
 }

 void timeline::add_cue(const cue& c)
 {
 	cues.emplace(c);
 }

 void timeline::remove_cue(const cue& c)
 {
 	cues.erase(c);
 }

 void timeline::remove_cues(float start, float end)
 {
 	auto lower_bound = cues.lower_bound({start, nullptr});
 	auto upper_bound = cues.upper_bound({end, nullptr});
 	cues.erase(lower_bound, upper_bound);
 }

 void timeline::add_sequence(const sequence& s)
 {
 	for (const cue& c: s)
 	{
 		add_cue(c);
 	}
 }

 void timeline::remove_sequence(const sequence& s)
 {
 	for (const cue& c: s)
 	{
 		remove_cue(c);
 	}
 }

 void timeline::clear()
 {
 	cues.clear();
 }

 void timeline::set_autoremove(bool enabled)
 {
 	autoremove = enabled;
 }

 sequence timeline::get_cues(float start, float end)
 {
 	sequence s;

 	auto lower_bound = cues.lower_bound({start, nullptr});
 	auto upper_bound = cues.upper_bound({end, nullptr});
 	for (auto iterator = lower_bound; iterator != upper_bound; ++iterator)
 	{
 		s.push_back(*iterator);
 	}

 	return s;
 }

--- a/src/antkeeper/animation/timeline.hpp
+++ b/src/antkeeper/animation/timeline.hpp
@ -0,0 +1,136 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_TIMELINE_HPP
 #define ANTKEEPER_TIMELINE_HPP

 #include <functional>
 #include <set>
 #include <tuple>

 /**
 * Scheduled function consisting of a time and function object.
 */
 typedef std::tuple<float, std::function<void()>> cue;

 /**
 * List of cues.
 */
 typedef std::list<cue> sequence;

 /**
 * Timeline which executes cues (scheduled functions) when advanced over their respective positions in time.
 */
 class timeline
 {
 public:
 	/**
 	 * Creates a timeline.
 	 */
 	timeline();

 	/**
 	 * Advances the timeline position (t) by @p dt, triggering any cues scheduled between `t` and `dt`. If autoremove is enabled, triggered cues will be removed.
 	 *
 	 * @param dt Delta time by which the timeline position will be advanced.
 	 */
 	void advance(float dt);

 	/**
 	 * Sets the timeline position to @p t.
 	 *
 	 * @param t Position in time to which the timeline position will be set.
 	 */
 	void seek(float t);

 	/**
 	 * Adds a cue to the timeline.
 	 *
 	 * @param c Cue to add.
 	 */
 	void add_cue(const cue& c);

 	/**
 	 * Removes a cue from the timeline. If there are multiple identical cues (same time and function), they will all be removed.
 	 *
 	 * @param c Cue to remove.
 	 */
 	void remove_cue(const cue& c);

 	/**
 	 * Removes all cues on `[start, end)`.
 	 *
 	 * @param start Starting position in time (inclusive).
 	 * @param end Ending position in time (non-inclusive).
 	 */
 	void remove_cues(float start, float end);

 	/**
 	 * Adds a sequence of cues to the timeline.
 	 *
 	 * @param s Sequence of cues to add.
 	 */
 	void add_sequence(const sequence& s);

 	/**
 	 * Removes a sequence of cues from the timeline.
 	 *
 	 * @param s Sequence of cues to remove.
 	 */
 	void remove_sequence(const sequence& s);

 	/**
 	 * Removes all cues from the timeline.
 	 */
 	void clear();

 	/**
 	 * If enabled, cues will be automatically removed from the timeline when they are triggered.
 	 *
 	 * @param enabled Whether to enable autoremove.
 	 */
 	void set_autoremove(bool enabled);

 	/**
 	 * Returns the current position in time on the timeline.
 	 */
 	float get_position() const;

 	/**
 	 * Returns all the cues on `[start, end)`.
 	 *
 	 * @param start Starting position in time (inclusive).
 	 * @param end Ending position in time (non-inclusive).
 	 * @return All cues on `[start, end)`.
 	 */
 	sequence get_cues(float start, float end);

 private:
 	std::multiset<cue, std::function<bool(const cue&, const cue&)>> cues;
 	float position;
 	bool autoremove;
 };

 inline float timeline::get_position() const
 {
 	return position;
 }

 #endif // ANTKEEPER_TIMELINE_HPP

--- a/src/antkeeper/animation/tween.hpp
+++ b/src/antkeeper/animation/tween.hpp
@ -0,0 +1,177 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_TWEEN_HPP
 #define ANTKEEPER_TWEEN_HPP

 #include <algorithm>
 #include <functional>
 #include <type_traits>

 /**
 * Linearly interpolates between two values.
 *
 * @param x Start of the range in which to interpolate.
 * @param y End of the range in which to interpolate.
 * @param a Value used to interpolate between @p x and @p y.
 * @return Interpolated value.
 */
 template <class T>
 T tween_default_lerp(const T& x, const T& y, float a);

 /**
 * Container which stores two states along with an interpolator, for quick and easy tweening.
 *
 * @tparam T Value type.
 * @tparam Interpolator Interpolator function or function object type.
 */
 template <class T, class Interpolator = typename std::function<std::remove_pointer<T>::type(const T&, const T&, float)>>
 class tween
 {
 public:
 	typedef typename std::remove_pointer<T>::type value_type;
 	typedef typename std::decay<Interpolator>::type interpolator_type;

 	/**
 	 * Creates a tween.
 	 *
 	 * @param state0 Initial value of state 0.
 	 * @param state1 Initial value of state 1.
 	 * @param interpolator Function or function object that will be used to interpolate between states 0 and 1.
 	 */
 	explicit tween(const T& state0, const T& state1, const interpolator_type& interpolator = tween_default_lerp<T>);

 	/**
 	 * Creates a tween.
 	 *
 	 * @param value Initial value of states 0 and 1.
 	 * @param interpolator Function or function object that will be used to interpolate between states 0 and 1.
 	 */
 	explicit tween(const T& value, const interpolator_type& interpolator = tween_default_lerp<T>);

 	/**
 	 * Creates a tween.
 	 *
 	 * @param interpolator Function or function object that will be used to interpolate between states 0 and 1.
 	 */
 	explicit tween(const interpolator_type& interpolator = tween_default_lerp<T>);

 	/**
 	 * Returns a reference to the specified tween state.
 	 *
 	 * @param state Index of a tween state. Should be either `0` or `1`.
 	 * @return Reference to the specified tween state.
 	 */
 	const T& operator[](int state) const;

 	/// @copydoc tween::operator[](int) const
 	T& operator[](int state);

 	/**
 	 * Returns an interpolated state between state 0 and state 1.
 	 *
 	 * @param a Interpolation factor. Should be on `[0.0, 1.0]`.
 	 * @return Interpolated state.
 	 */
 	value_type interpolate(float a) const;

 	/**
 	 * Returns the function or function object that is used to interpolate between states 0 and 1.
 	 */
 	const interpolator_type& get_interpolator() const;

 	/**
 	 * Sets state 0 = state 1.
 	 */
 	void update();

 	/**
 	 * Swaps state 0 and state 1.
 	 */
 	void swap();

 private:
 	interpolator_type interpolator;
 	T state0;
 	T state1;
 };

 template <class T>
 inline T tween_default_lerp(const T& x, const T& y, float a)
 {
 	return x * (1.0f - a) + y * a;
 }

 template <class T, class Interpolator>
 tween<T, Interpolator>::tween(const T& value, const interpolator_type& interpolator):
 	interpolator(interpolator),
 	state0(value),
 	state1(value)
 {}

 template <class T, class Interpolator>
 tween<T, Interpolator>::tween(const T& state0, const T& state1, const interpolator_type& interpolator):
 	interpolator(interpolator),
 	state0(state0),
 	state1(state1)
 {}

 template <class T, class Interpolator>
 tween<T, Interpolator>::tween(const interpolator_type& interpolator):
 	interpolator(interpolator)
 {}

 template <class T, class Interpolator>
 inline const T& tween<T, Interpolator>::operator[](int state) const
 {
 	return (state <= 0) ? state0 : state1;
 }

 template <class T, class Interpolator>
 inline T& tween<T, Interpolator>::operator[](int state)
 {
 	return (state <= 0) ? state0 : state1;
 }

 template <class T, class Interpolator>
 inline typename tween<T, Interpolator>::value_type tween<T, Interpolator>::interpolate(float a) const
 {
 	return interpolator(state0, state1, a);
 }

 template <class T, class Interpolator>
 inline const typename tween<T, Interpolator>::interpolator_type& tween<T, Interpolator>::get_interpolator() const
 {
 	return interpolator;
 }

 template <class T, class Interpolator>
 inline void tween<T, Interpolator>::update()
 {
 	state0 = state1;
 }

 template <class T, class Interpolator>
 inline void tween<T, Interpolator>::swap()
 {
 	std::swap(state0, state1);
 }

 #endif // ANTKEEPER_TWEEN_HPP

--- a/src/antkeeper/application.cpp
+++ b/src/antkeeper/application.cpp
--- a/src/antkeeper/application.hpp
+++ b/src/antkeeper/application.hpp
@ -0,0 +1,386 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_APPLICATION_HPP
 #define ANTKEEPER_APPLICATION_HPP

 // STL
 #include <fstream>
 #include <functional>
 #include <list>
 #include <map>
 #include <string>

 // External
 #include <entt/entt.hpp>

 // Debug
 #include "debug/logger.hpp"
 #include "debug/performance-sampler.hpp"

 // Input
 #include "input/control.hpp"
 #include "input/control-set.hpp"
 #include "input/keyboard.hpp"
 #include "input/mouse.hpp"
 #include "input/game-controller.hpp"
 #include "input/input-event-router.hpp"
 #include "input/input-mapper.hpp"

 // Event
 #include "event/event-dispatcher.hpp"

 // Renderer
 #include "renderer/compositor.hpp"
 #include "renderer/renderer.hpp"

 // Scene
 #include "scene/scene.hpp"
 #include "scene/camera.hpp"
 #include "scene/ambient-light.hpp"
 #include "scene/directional-light.hpp"
 #include "scene/point-light.hpp"
 #include "scene/spotlight.hpp"
 #include "scene/model-instance.hpp"

 // Animation
 #include "animation/timeline.hpp"
 #include "animation/animation.hpp"
 #include "animation/tween.hpp"

 // Misc
 #include "state/fsm.hpp"
 #include "frame-scheduler.hpp"
 #include "pheromone-matrix.hpp"
 #include "orbit-cam.hpp"

 // Forward declarations
 //{
 	// SDL
 	typedef struct SDL_Window SDL_Window;
 	typedef void* SDL_GLContext;
 	
 	// Resources
 	class resource_manager;
 	
 	// Rasterizer
 	class rasterizer;
 	class framebuffer;
 	class vertex_buffer;
 	class vertex_array;
 	class texture_2d;
 	
 	// Renderer
 	class clear_pass;
 	class shadow_map_pass;
 	class material_pass;
 	class sky_pass;
 	class bloom_pass;
 	class final_pass;

 	// Systems
 	class behavior_system;
 	class camera_system;
 	class collision_system;
 	class locomotion_system;
 	class model_system;
 	class nest_system;
 	class placement_system;
 	class samara_system;
 	class subterrain_system;
 	class terrain_system;
 	class vegetation_system;
 	class tool_system;
 	class control_system;
 	class ui_system;
 //}

 class application
 {
 public:
 	/**
 	 * Creates and initializes an application.
 	 */
 	application(int argc, char** argv);
 	
 	/**
 	 * Destroys an application.
 	 */
 	~application();

 	/**
 	 * Executes the application, causing it to enter the execution loop until closed.
 	 *
 	 * @return Exit status code.
 	 */
 	int execute();

 	/**
 	 * Requests the application's execution loop to cleanly terminate, and specifies its exit status code.
 	 *
 	 * @param status Status to be returned by application::execute() upon execution loop termination.
 	 */
 	void close(int status);

 	logger* get_logger();
 	resource_manager* get_resource_manager();
 	fsm::machine* get_state_machine();
 	const fsm::state& get_loading_state() const;
 	const fsm::state& get_language_select_state() const;
 	const fsm::state& get_splash_state() const;
 	const fsm::state& get_title_state() const;
 	const fsm::state& get_play_state() const;
 	const fsm::state& get_pause_state() const;
 	timeline* get_timeline();
 	animator* get_animator();
 	camera* get_camera();
 	orbit_cam* get_orbit_cam();
 	control_system* get_control_system();

 	entt::registry& get_ecs_registry();
 	scene& get_scene();

 	void take_screenshot() const;

 private:
 	void update(double t, double dt);
 	void render(double alpha);
 	void translate_sdl_events();
 	void set_relative_mouse_mode(bool enabled);
 	void toggle_fullscreen();
 	void window_resized();
 	static void save_image(const std::string& filename, int w, int h, const unsigned char* pixels);

 	bool fullscreen;
 	std::tuple<int, int> saved_mouse_position;
 	std::tuple<int, int> window_dimensions;
 	std::tuple<int, int> window_position;
 	std::tuple<int, int> display_dimensions;
 	float4 viewport;

 	// Debugging
 	std::ofstream log_filestream;
 	logger logger;

 	// Paths
 	std::string data_path;
 	std::string config_path;
 	std::string screenshots_path;

 	// Resources
 	resource_manager* resource_manager;

 	SDL_Window* window;
 	SDL_GLContext context;
 	bool closed;
 	int exit_status;

 	// Updatable systems
 	timeline timeline;
 	animator animator;
 	std::list<std::function<void(double, double)>> systems;
 	
 	int shadow_map_resolution;
 	framebuffer* shadow_map_framebuffer;
 	texture_2d* shadow_map_depth_texture;
 	
 	framebuffer* framebuffer_hdr;
 	texture_2d* framebuffer_hdr_color;
 	texture_2d* framebuffer_hdr_depth;
 	
 	framebuffer* framebuffer_bloom; // General purpose framebuffer A
 	texture_2d* bloom_texture;
 	
 	// Rendering
 	rasterizer* rasterizer;
 	material* fallback_material;
 	::clear_pass* clear_pass;
 	::sky_pass* sky_pass;
 	::material_pass* material_pass;
 	compositor default_compositor;
 	::clear_pass* shadow_map_clear_pass;
 	::shadow_map_pass* shadow_map_pass;
 	::bloom_pass* bloom_pass;
 	::final_pass* final_pass;
 	
 	camera default_camera;
 	ambient_light sun_indirect;
 	directional_light sun_direct;
 	point_light subterrain_light;
 	ambient_light underworld_ambient_light;
 	model_instance darkness_volume;
 	model_instance lantern;
 	model_instance cloud;
 	model_instance* grass_patches;
 	::spotlight spotlight;
 	vertex_buffer* billboard_vbo;
 	vertex_array* billboard_vao;
 	::renderer renderer;
 	scene overworld_scene;
 	scene underworld_scene;
 	scene* active_scene;

 	// FSM
 	fsm::machine state_machine;
 	fsm::state loading_state;
 	fsm::state language_select_state;
 	fsm::state splash_state;
 	fsm::state title_state;
 	fsm::state play_state;
 	fsm::state pause_state;

 	// Frame timing
 	frame_scheduler frame_scheduler;
 	performance_sampler performance_sampler;
 	tween<double> time;

 	// Events
 	event_dispatcher event_dispatcher;
 	input_event_router input_event_router;
 	input_mapper input_mapper;

 	// Input devices
 	keyboard keyboard;
 	mouse mouse;
 	game_controller game_controller;

 	// Controls
 	control_set menu_controls;
 	control menu_back_control;
 	control menu_select_control;
 	control_set* camera_controls;

 	// System controls
 	control_set application_controls;
 	control toggle_fullscreen_control;
 	control screenshot_control;
 	control dig_control;

 	// Game
 	orbit_cam orbit_cam;
 	pheromone_matrix pheromones;
 	control_system* control_system;

 	// ECS
 	entt::registry ecs_registry;
 	behavior_system* behavior_system;
 	camera_system* camera_system;
 	collision_system* collision_system;
 	locomotion_system* locomotion_system;
 	model_system* model_system;
 	nest_system* nest_system;
 	placement_system* placement_system;
 	samara_system* samara_system;
 	subterrain_system* subterrain_system;
 	terrain_system* terrain_system;
 	vegetation_system* vegetation_system;
 	tool_system* tool_system;
 	
 	// UI
 	ui_system* ui_system;
 	compositor ui_compositor;
 	::clear_pass* ui_clear_pass;
 	::material_pass* ui_material_pass;
 	
 	// Animation
 	tween<float3> focal_point_tween;
 };

 inline logger* application::get_logger()
 {
 	return &logger;
 }

 inline resource_manager* application::get_resource_manager()
 {
 	return resource_manager;
 }

 inline fsm::machine* application::get_state_machine()
 {
 	return &state_machine;
 }

 inline const fsm::state& application::get_loading_state() const
 {
 	return loading_state;
 }

 inline const fsm::state& application::get_language_select_state() const
 {
 	return language_select_state;
 }

 inline const fsm::state& application::get_splash_state() const
 {
 	return splash_state;
 }

 inline const fsm::state& application::get_title_state() const
 {
 	return title_state;
 }

 inline const fsm::state& application::get_play_state() const
 {
 	return play_state;
 }

 inline const fsm::state& application::get_pause_state() const
 {
 	return pause_state;
 }

 inline timeline* application::get_timeline()
 {
 	return &timeline;
 }

 inline animator* application::get_animator()
 {
 	return &animator;
 }

 inline camera* application::get_camera()
 {
 	return &default_camera;
 }

 inline orbit_cam* application::get_orbit_cam()
 {
 	return &orbit_cam;
 }

 inline control_system* application::get_control_system()
 {
 	return control_system;
 }

 inline entt::registry& application::get_ecs_registry()
 {
 	return ecs_registry;
 }

 inline scene& application::get_scene()
 {
 	return overworld_scene;
 }

 #endif // ANTKEEPER_APPLICATION_HPP

--- a/src/antkeeper/behavior/behavior-tree.hpp
+++ b/src/antkeeper/behavior/behavior-tree.hpp
@ -0,0 +1,193 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_BEHAVIOR_TREE_HPP
 #define ANTKEEPER_BEHAVIOR_TREE_HPP

 #include <functional>
 #include <list>

 namespace behavior_tree {

 /// Behavior tree node return status enumerations.
 enum class status
 {
 	failure, ///< Indicates a node's execution failed.
 	success, ///< Indicates a node's execution succeed.
 	running  ///< Indicates a node's execution has not finished.
 };

 /**
 * Abstract base class for behavior tree nodes.
 *
 * @tparam T Data type on which nodes operate.
 */
 template <class T>
 struct node
 {
 	/// Data type on which nodes operate.
 	typedef T context_type;

 	/**
 	 * Executes a node's functionality and returns its status.
 	 *
 	 * @param context Context data on which the node will operate.
 	 */
 	virtual status execute(context_type& context) const = 0;
 };

 /// A node with no children.
 template <class T>
 using leaf_node = node<T>;

 /// A node with exactly one child.
 template <class T>
 struct decorator_node: node<T>
 {
 	node* child;
 };

 /// A node that can have one or more children.
 template <class T>
 struct composite_node: node<T>
 {
 	std::list<node*> children;
 };

 /// Executes a function on a context and returns the status.
 template <class T>
 struct action: leaf_node<T>
 {
 	virtual status execute(context_type& context) const final;
 	typedef std::function<status(context_type&)> function_type;
 	function_type function;
 };

 /// Evaluates a boolean condition (predicate) and returns either `status::success` or `status::failure`.
 template <class T>
 struct condition: leaf_node<T>
 {
 	virtual status execute(context_type& context) const final;
 	typedef std::function<status(const context_type&)> predicate_type;
 	predicate_type predicate;
 };

 /// Executes a child node and returns its inverted status. If the child returns `status::success`, then `status::failure` will be returned. Otherwise if the child returns `status::failure`, then `status::success` will be returned.
 template <class T>
 struct inverter: decorator_node<T>
 {
 	virtual status execute(context_type& context) const final;
 };

 /// Attempts to execute a child node `n` times or until the child fails.
 template <class T>
 struct repeater: decorator_node<T>
 {
 	virtual status execute(context_type& context) const final;
 	int n;
 };

 /// Executes a child node and returns `status::success` regardless of the child node status.
 template <class T>
 struct succeeder: decorator_node<T>
 {
 	virtual status execute(context_type& context) const final;
 };

 /// Attempts to execute each child node sequentially until one fails. If all children are executed successfully, `status::success` will be returned. Otherwise if any children fail, `status::failure` will be returned.
 template <class T>
 struct sequence: composite_node<T>
 {
 	virtual status execute(context_type& context) const final;
 };

 /// Attempts to execute each child node sequentially until one succeeds. If a child succeeds, `status::success` will be returned. Otherwise if all children fail, `status::failure` will be returned.
 template <class T>
 struct selector: composite_node<T>
 {
 	virtual status execute(context_type& context) const final;
 };

 template <class T>
 status action<T>::execute(context_type& context) const
 {
 	return function(context);
 }

 template <class T>
 status condition<T>::execute(context_type& context) const
 {
 	return (predicate(context)) ? status::success : status::failure;
 }

 template <class T>
 status inverter<T>::execute(context_type& context) const
 {
 	status child_status = child->execute(context);
 	return (child_status == status::success) ? status::failure : (child_status == status::failure) ? status::success : child_status;
 }

 template <class T>
 status repeater<T>::execute(context_type& context) const
 {
 	status child_status;
 	for (int i = 0; i < n; ++i)
 	{
 		child_status = child->execute(context);
 		if (child_status == status::failure)
 			break;
 	}
 	return child_status;
 }

 template <class T>
 status succeeder<T>::execute(context_type& context) const
 {
 	child->execute(context);
 	return status::success;
 }

 template <class T>
 status sequence<T>::execute(context_type& context) const
 {
 	for (const node* child: children)
 	{
 		status child_status = child->execute(context);
 		if (child_status != status::success)
 			return child_status;
 	}
 	return status::success;
 }

 template <class T>
 status selector<T>::execute(context_type& context) const
 {
 	for (const node* child: children)
 	{
 		status child_status = child->execute(context);
 		if (child_status != status::failure)
 			return child_status;
 	}
 	return status::failure;
 }

 } // namespace behavior_tree

 #endif // ANTKEEPER_BEHAVIOR_TREE_HPP

--- a/src/antkeeper/behavior/ebt.cpp
+++ b/src/antkeeper/behavior/ebt.cpp
@ -0,0 +1,54 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "behavior/ebt.hpp"
 #include "entity/components/transform-component.hpp"
 #include <iostream>

 using namespace ecs;

 namespace ebt {

 status print(context& context, const std::string& text)
 {
 	std::cout << text;
 	return status::success;
 }

 status print_eid(context& context)
 {
 	std::cout << context.entity << std::endl;
 	return status::success;
 }

 status warp_to(context& context, float x, float y, float z)
 {
 	auto& transform = context.registry->get<transform_component>(context.entity);
 	transform.transform.translation = {x, y, z};
 	transform.warp = true;
 	return status::success;
 }

 bool is_carrying_food(const context& context)
 {
 	return false;
 }

 } // namespace ebt

--- a/src/antkeeper/behavior/ebt.hpp
+++ b/src/antkeeper/behavior/ebt.hpp
@ -0,0 +1,66 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_EBT_HPP
 #define ANTKEEPER_EBT_HPP

 #include "behavior/behavior-tree.hpp"
 #include <entt/entt.hpp>

 /// Entity Behavior Tree

 /**
 * The `ebt` namespace defines Entity Behavior Tree (EBT) nodes and an EBT context, on which EBT nodes operate.
 */
 namespace ebt {

 /**
 * EBT context which references an entity and its registry.
 */
 struct context
 {
 	entt::registry* registry;
 	entt::entity entity;
 };

 typedef behavior_tree::status status;
 typedef behavior_tree::node<context> node;
 typedef behavior_tree::leaf_node<context> leaf_node;
 typedef behavior_tree::decorator_node<context> decorator_node;
 typedef behavior_tree::composite_node<context> composite_node;
 typedef behavior_tree::action<context> action;
 typedef behavior_tree::condition<context> condition;
 typedef behavior_tree::inverter<context> inverter;
 typedef behavior_tree::repeater<context> repeater;
 typedef behavior_tree::succeeder<context> succeeder;
 typedef behavior_tree::sequence<context> sequence;
 typedef behavior_tree::selector<context> selector;

 // Actions
 status print(context& context, const std::string& text);
 status print_eid(context& context);
 status warp_to(context& context, float x, float y, float z);

 // Conditions
 bool is_carrying_food(const context& context);

 } // namespace ebt

 #endif // ANTKEEPER_EBT_HPP

--- a/src/antkeeper/camera-rig.cpp
+++ b/src/antkeeper/camera-rig.cpp
@ -0,0 +1,65 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "orbit-cam.hpp"
 #include "scene/camera.hpp"
 #include "configuration.hpp"
 #include <algorithm>
 #include <cmath>

 using namespace vmq::operators;

 camera_rig::camera_rig():
 	camera(nullptr),
 	translation{0.0f, 0.0f, 0.0f},
 	rotation(vmq::identity_quaternion<float>),
 	forward(global_forward),
 	right(global_right),
 	up(global_up)
 {}

 void camera_rig::attach(::camera* camera)
 {
 	this->camera = camera;
 	if (camera != nullptr)
 	{
 		camera->look_at(translation, translation + forward, up);
 	}
 }

 void camera_rig::detach()
 {
 	camera = nullptr;
 }

 void camera_rig::set_translation(const float3& translation)
 {
 	this->translation = translation;
 }

 void camera_rig::set_rotation(const vmq::quaternion<float>& rotation)
 {
 	this->rotation = rotation;
 	
 	// Calculate orthonormal basis
 	forward = rotation * global_forward;
 	up = rotation * global_up;
 	right = rotation * global_right;
 }

--- a/src/antkeeper/camera-rig.hpp
+++ b/src/antkeeper/camera-rig.hpp
@ -0,0 +1,125 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CAMERA_RIG_HPP
 #define ANTKEEPER_CAMERA_RIG_HPP

 #include <vmq/vmq.hpp>

 using namespace vmq::types;

 class camera;

 /**
 * Abstract base class for camera rigs which control the movement of cameras.
 */
 class camera_rig
 {
 public:
 	camera_rig();
 	
 	/**
 	 * Updates the rig.
 	 *
 	 * @param dt Delta time.
 	 */
 	virtual void update(float dt) = 0;
 	
 	/**
 	 * Attaches a camera to the rig.
 	 *
 	 * @param camera Camera to attach.
 	 */
 	void attach(::camera* camera);
 	
 	/**
 	 * Detaches a camera from the rig.
 	 */
 	void detach();
 	
 	/**
 	 * Sets the translation of the camera rig.
 	 */
 	void set_translation(const float3& translation);
 	
 	/**
 	 * Sets the rotation of the camera rig.
 	 */
 	void set_rotation(const vmq::quaternion<float>& rotation);
 	
 	/**
 	 * Returns the attached camera.
 	 */
 	const ::camera* get_camera() const;
 	
 	/// @copydoc camera_rig::get_camera() const
 	::camera* get_camera();
 	
 	const float3& get_translation() const;
 	const vmq::quaternion<float>& get_rotation() const;
 	const float3& get_forward() const;
 	const float3& get_right() const;
 	const float3& get_up() const;

 private:
 	camera* camera;
 	float3 translation;
 	vmq::quaternion<float> rotation;
 	float3 forward;
 	float3 right;
 	float3 up;
 };

 inline const camera* camera_rig::get_camera() const
 {
 	return camera;
 }

 inline camera* camera_rig::get_camera()
 {
 	return camera;
 }

 inline const float3& camera_rig::get_translation() const
 {
 	return translation;
 }

 inline const vmq::quaternion<float>& camera_rig::get_rotation() const
 {
 	return rotation;
 }

 inline const float3& camera_rig::get_forward() const
 {
 	return forward;
 }

 inline const float3& camera_rig::get_right() const
 {
 	return right;
 }

 inline const float3& camera_rig::get_up() const
 {
 	return up;
 }

 #endif // ANTKEEPER_CAMERA_RIG_HPP

--- a/src/antkeeper/configuration.hpp.in
+++ b/src/antkeeper/configuration.hpp.in
@ -0,0 +1,44 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CONFIGURATION_HPP
 #define ANTKEEPER_CONFIGURATION_HPP

 #include <vmq/vmq.hpp>

 using namespace vmq::types;

 #define ANTKEEPER_VERSION_MAJOR @PROJECT_VERSION_MAJOR@
 #define ANTKEEPER_VERSION_MINOR @PROJECT_VERSION_MINOR@
 #define ANTKEEPER_VERSION_PATCH @PROJECT_VERSION_PATCH@
 #define ANTKEEPER_VERSION_STRING "@PROJECT_VERSION@"

 constexpr float3 global_forward = {0.0f, 0.0f, -1.0f};
 constexpr float3 global_up = {0.0f, 1.0f, 0.0f};
 constexpr float3 global_right = {1.0f, 0.0f, 0.0f};

 #define MATERIAL_PASS_MAX_AMBIENT_LIGHT_COUNT 1
 #define MATERIAL_PASS_MAX_POINT_LIGHT_COUNT 1
 #define MATERIAL_PASS_MAX_DIRECTIONAL_LIGHT_COUNT 1
 #define MATERIAL_PASS_MAX_SPOTLIGHT_COUNT 1
 #define TERRAIN_PATCH_SIZE 200.0f
 #define TERRAIN_PATCH_RESOLUTION 4
 #define VEGETATION_PATCH_RESOLUTION 1

 #endif // ANTKEEPER_CONFIGURATION_HPP
--- a/src/antkeeper/debug/ansi-codes.hpp
+++ b/src/antkeeper/debug/ansi-codes.hpp
@ -0,0 +1,70 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ANSI_CODES_HPP
 #define ANTKEEPER_ANSI_CODES_HPP

 namespace ansi {

 constexpr char* reset = "\u004b[0m";

 constexpr char* black = "\u003b[30m";
 constexpr char* red = "\u003b[31m";
 constexpr char* green = "\u003b[32m";
 constexpr char* yellow = "\u003b[33m";
 constexpr char* blue = "\u003b[34m";
 constexpr char* magenta = "\u003b[35m";
 constexpr char* cyan = "\u003b[36m";
 constexpr char* white = "\u003b[37m";

 constexpr char* bright_black = "\u003b[30;1m";
 constexpr char* bright_red = "\u003b[31;1m";
 constexpr char* bright_green = "\u003b[32;1m";
 constexpr char* bright_yellow = "\u003b[33;1m";
 constexpr char* bright_blue = "\u003b[34;1m";
 constexpr char* bright_magenta = "\u003b[35;1m";
 constexpr char* bright_cyan = "\u003b[36;1m";
 constexpr char* bright_white = "\u003b[37;1m";

 constexpr char* background_black = "\u003b[40m";
 constexpr char* background_red = "\u003b[41m";
 constexpr char* background_green = "\u003b[42m";
 constexpr char* background_yellow = "\u003b[43m";
 constexpr char* background_blue = "\u003b[44m";
 constexpr char* background_magenta = "\u003b[45m";
 constexpr char* background_cyan = "\u003b[46m";
 constexpr char* background_white = "\u003b[47m";

 constexpr char* background_bright_black = "\u003b[40;1m";
 constexpr char* background_bright_red = "\u003b[41;1m";
 constexpr char* background_bright_green = "\u003b[42;1m";
 constexpr char* background_bright_yellow = "\u003b[43;1m";
 constexpr char* background_bright_blue = "\u003b[44;1m";
 constexpr char* background_bright_magenta = "\u003b[45;1m";
 constexpr char* background_bright_cyan = "\u003b[46;1m";
 constexpr char* background_bright_white = "\u003b[47;1m";

 constexpr char* bold = "\u003b[1m";
 constexpr char* underline = "\u003b[4m";
 constexpr char* reversed = "\u001b[7m";

 } // namespace ansi

 #endif // ANTKEEPER_ANSI_CODES_HPP

--- a/src/antkeeper/debug/cli.hpp
+++ b/src/antkeeper/debug/cli.hpp
@ -0,0 +1,153 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CLI_HPP
 #define ANTKEEPER_CLI_HPP

 #include <functional>
 #include <map>
 #include <sstream>
 #include <string>
 #include <tuple>

 /**
 * Minimal command-line interpreter.
 */
 class cli
 {
 public:
 	/// String-wrapped function object
 	typedef std::function<std::string(const std::string&)> command_type;

 	/**
 	 * Interprets a command line as a function invocation.
 	 *
 	 * @param line Command line.
 	 * @return Stringified return value of the command function.
 	 */
 	std::string interpret(const std::string& line) const;

 	/**
 	 * Registers a command with the CLI.
 	 *
 	 * @tparam T Command function return type.
 	 * @tparam Args Command function argument types.
 	 * @param name Command name.
 	 * @param function Command function.
 	 */
 	template <class T, class... Args>
 	void register_command(const std::string& name, const std::function<T(Args...)>& function);

 	/// @copydoc register_command(const std::string, const std::function<T(Args...)>&)
 	template <class T, class... Args>
 	void register_command(const std::string& name, T (*function)(Args...));

 	/**
 	 * Unregisters a command from the CLI.
 	 *
 	 * @param name Command name.
 	 */
 	void unregister_command(const std::string& name);

 private:
 	/**
 	 * Parses a single argument from a string stream.
 	 *
 	 * @param stream String stream from which an argument should be parsed.
 	 */
 	template <class T>
 	static T parse(std::istringstream& stream);

 	/**
 	 * Wraps a function in an interpreter function that parses strings as arguments then executes the wrapped function with the parsed arguments.
 	 *
 	 * @param function Function to wrap.
 	 * @return Wrapped function.
 	 */
 	template <class T, class... Args>
 	static command_type wrap(const std::function<T(Args...)>& function);

 	std::map<std::string, command_type> commands;
 };

 std::string cli::interpret(const std::string& line) const
 {
 	std::istringstream stream(line);
 	std::string command_name;
 	stream >> command_name;

 	if (auto it = commands.find(command_name); it != commands.end())
 	{
 		return it->second(line.substr(command_name.length() + 1));
 	}

 	return std::string();
 }

 template <class T, class... Args>
 void cli::register_command(const std::string& name, const std::function<T(Args...)>& function)
 {
 	commands[name] = wrap(function);
 }

 template <class T, class... Args>
 void cli::register_command(const std::string& name, T (*function)(Args...))
 {
 	commands[name] = wrap(std::function(function));
 }

 void cli::unregister_command(const std::string& name)
 {
 	if (auto it = commands.find(name); it != commands.end())
 		commands.erase(it);
 }

 template <class T>
 T cli::parse(std::istringstream& stream)
 {
 	T value;
 	stream >> value;
 	return value;
 }

 template <class T, class... Args>
 typename cli::command_type cli::wrap(const std::function<T(Args...)>& function)
 {
 	return std::bind(
 		[function](const std::string& line) -> std::string
 		{
 			//std::size_t argument_count = sizeof...(Args);

 			// Parse string into tuple of arguments
 			std::istringstream istream(line);
 			std::tuple<Args...> arguments{parse<Args>(istream)...};

 			// Invoke function with arguments and save the result
 			T result = std::apply(function, arguments);

 			// Return function result as string
 			std::ostringstream ostream;
 			ostream << result;
 			return ostream.str();
 		},
 		std::placeholders::_1);
 }

 #endif // ANTKEEPER_CLI_HPP

--- a/src/antkeeper/debug/logger.cpp
+++ b/src/antkeeper/debug/logger.cpp
@ -0,0 +1,122 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "logger.hpp"
 #include <iostream>

 logger::logger():
 	os(&std::cout),
 	log_prefix(std::string()),
 	log_postfix(std::string()),
 	warning_prefix(std::string("Warning: ")),
 	warning_postfix(std::string()),
 	error_prefix(std::string("Error: ")),
 	error_postfix(std::string()),
 	success_prefix(std::string("Success: ")),
 	success_postfix(std::string())
 {}

 logger::~logger()
 {}

 void logger::redirect(std::ostream* stream)
 {
 	os = stream;
 }

 void logger::log(const std::string& text)
 {
 	if (os)
 	{
 		for (const std::string& prefix: prefix_stack)
 		{
 			(*os) << prefix;
 		}

 		(*os) << (log_prefix + text + log_postfix);

 		os->flush();
 	}
 }

 void logger::warning(const std::string& text)
 {
 	log(warning_prefix + text + warning_postfix);
 }

 void logger::error(const std::string& text)
 {
 	log(error_prefix + text + error_postfix);
 }

 void logger::success(const std::string& text)
 {
 	log(success_prefix + text + success_postfix);
 }

 void logger::set_log_prefix(const std::string& prefix)
 {
 	log_prefix = prefix;
 }

 void logger::set_log_postfix(const std::string& postfix)
 {
 	log_postfix = postfix;
 }

 void logger::set_warning_prefix(const std::string& prefix)
 {
 	warning_prefix = prefix;
 }

 void logger::set_warning_postfix(const std::string& postfix)
 {
 	warning_postfix = postfix;
 }

 void logger::set_error_prefix(const std::string& prefix)
 {
 	error_prefix = prefix;
 }

 void logger::set_error_postfix(const std::string& postfix)
 {
 	error_postfix = postfix;
 }

 void logger::set_success_prefix(const std::string& prefix)
 {
 	success_prefix = prefix;
 }

 void logger::set_success_postfix(const std::string& postfix)
 {
 	success_postfix = postfix;
 }

 void logger::push_prefix(const std::string& prefix)
 {
 	prefix_stack.push_back(prefix);
 }

 void logger::pop_prefix()
 {
 	prefix_stack.pop_back();
 }

--- a/src/antkeeper/debug/logger.hpp
+++ b/src/antkeeper/debug/logger.hpp
@ -0,0 +1,74 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_LOGGER_HPP
 #define ANTKEEPER_LOGGER_HPP

 #include <list>
 #include <ostream>
 #include <string>

 class logger
 {
 public:
 	logger();
 	~logger();

 	/**
 	 * Redirects log output to the specified output stream.
 	 *
 	 * @param stream Output stream to which log text will be written.
 	 */
 	void redirect(std::ostream* stream);
 	/**
 	 * Outputs text to the log.
 	 */
 	void log(const std::string& text);

 	void warning(const std::string& text);
 	void error(const std::string& text);
 	void success(const std::string& text);

 	void set_log_prefix(const std::string& prefix);
 	void set_log_postfix(const std::string& postfix);
 	void set_warning_prefix(const std::string& prefix);
 	void set_warning_postfix(const std::string& postfix);
 	void set_error_prefix(const std::string& prefix);
 	void set_error_postfix(const std::string& postfix);
 	void set_success_prefix(const std::string& prefix);
 	void set_success_postfix(const std::string& postfix);

 	void push_prefix(const std::string& prefix);
 	void pop_prefix();

 private:
 	std::ostream* os;
 	std::string log_prefix;
 	std::string log_postfix;
 	std::string warning_prefix;
 	std::string warning_postfix;
 	std::string error_prefix;
 	std::string error_postfix;
 	std::string success_prefix;
 	std::string success_postfix;
 	std::list<std::string> prefix_stack;
 };

 #endif // ANTKEEPER_LOGGER_HPP

--- a/src/antkeeper/debug/performance-sampler.cpp
+++ b/src/antkeeper/debug/performance-sampler.cpp
@ -0,0 +1,62 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "performance-sampler.hpp"
 #include <algorithm>
 #include <numeric>

 performance_sampler::performance_sampler():
 	sample_size(1),
 	sample_index(0)
 {}

 void performance_sampler::sample(double duration)
 {
 	if (samples.size() < sample_size)
 	{
 		samples.push_back(duration);
 	}
 	else
 	{
 		samples[sample_index] = duration;
 		sample_index = (sample_index + 1) % samples.size();
 	}
 }

 void performance_sampler::reset()
 {
 	samples.clear();
 	sample_index = 0;
 }

 void performance_sampler::set_sample_size(std::size_t size)
 {
 	sample_size = size;
 	if (samples.size() > size)
 	{
 		samples.resize(size);
 		sample_index = 0;
 	}
 }

 double performance_sampler::mean_frame_duration() const
 {
 	return std::accumulate(samples.begin(), samples.end(), 0.0) / static_cast<double>(samples.size());
 }

--- a/src/antkeeper/debug/performance-sampler.hpp
+++ b/src/antkeeper/debug/performance-sampler.hpp
@ -0,0 +1,66 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_PERFORMANCE_SAMPLER_HPP
 #define ANTKEEPER_PERFORMANCE_SAMPLER_HPP

 #include <cstdlib>
 #include <vector>

 /**
 * Measures a rolling mean frame duration.
 */
 class performance_sampler
 {
 public:
 	/// Creates a performance sampler.
 	performance_sampler();

 	/**
 	 * Adds a frame duration to the sample.
 	 *
 	 * @param duration Duration of the frame.
 	 */
 	void sample(double duration);

 	/**
 	 * Resets the sampling process.
 	 */
 	void reset();

 	/**
 	 * Sets the number of frames in a sample.
 	 *
 	 * @param size Number of frames in a sample.
 	 */
 	void set_sample_size(std::size_t size);

 	/**
 	 * Returns the mean frame duration.
 	 */
 	double mean_frame_duration() const;

 private:
 	std::vector<double> samples;
 	std::size_t sample_size;
 	std::size_t sample_index;
 };

 #endif // ANTKEEPER_PERFORMANCE_SAMPLER_HPP

--- a/src/antkeeper/entity/archetype.hpp
+++ b/src/antkeeper/entity/archetype.hpp
@ -1,28 +1,32 @@
 /*
 * Copyright (C) 2017-2019  Christopher J. Howard
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 * This file is part of Antkeeper source code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef CURL_NOISE_HPP
 #define CURL_NOISE_HPP
 #ifndef ANTKEEPER_ECS_ARCHETYPE_HPP
 #define ANTKEEPER_ECS_ARCHETYPE_HPP

 #include <emergent/emergent.hpp>
 using namespace Emergent;
 #include <entt/entt.hpp>

 Vector3 curl(const Vector3& p, const Vector3& offset, float frequency);
 namespace ecs {

 typedef entt::prototype archetype;

 } // namespace ecs

 #endif // ANTKEEPER_ECS_ARCHETYPE_HPP

 #endif // CURL_NOISE_HPP
--- a/src/antkeeper/entity/components/behavior-component.hpp
+++ b/src/antkeeper/entity/components/behavior-component.hpp
@ -0,0 +1,35 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_BEHAVIOR_COMPONENT_HPP
 #define ANTKEEPER_ECS_BEHAVIOR_COMPONENT_HPP

 #include "behavior/ebt.hpp"

 namespace ecs {

 struct behavior_component
 {
 	const ebt::node* behavior_tree;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_BEHAVIOR_COMPONENT_HPP

--- a/src/antkeeper/entity/components/cavity-component.hpp
+++ b/src/antkeeper/entity/components/cavity-component.hpp
@ -0,0 +1,37 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_CAVITY_COMPONENT_HPP
 #define ANTKEEPER_ECS_CAVITY_COMPONENT_HPP

 #include <vmq/vmq.hpp>
 using namespace vmq::types;

 namespace ecs {

 struct cavity_component
 {
 	float3 position;
 	float radius;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_CAVITY_COMPONENT_HPP

--- a/src/antkeeper/entity/components/collision-component.hpp
+++ b/src/antkeeper/entity/components/collision-component.hpp
@ -0,0 +1,40 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_COLLISION_COMPONENT_HPP
 #define ANTKEEPER_ECS_COLLISION_COMPONENT_HPP

 #include "geometry/aabb.hpp"
 #include "geometry/mesh-accelerator.hpp"

 class mesh;

 namespace ecs {

 struct collision_component
 {
 	mesh* mesh;
 	aabb<float> bounds;
 	mesh_accelerator mesh_accelerator;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_COLLISION_COMPONENT_HPP

--- a/src/antkeeper/entity/components/locomotion-component.hpp
+++ b/src/antkeeper/entity/components/locomotion-component.hpp
@ -0,0 +1,38 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP
 #define ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP

 #include "geometry/mesh.hpp"
 #include <vmq/vmq.hpp>
 using namespace vmq::types;

 namespace ecs {

 struct locomotion_component
 {
 	const mesh::face* triangle;
 	float3 barycentric_position;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP

--- a/src/antkeeper/entity/components/model-component.hpp
+++ b/src/antkeeper/entity/components/model-component.hpp
@ -0,0 +1,38 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_MODEL_COMPONENT_HPP
 #define ANTKEEPER_ECS_MODEL_COMPONENT_HPP

 #include "renderer/model.hpp"
 #include <unordered_map>

 namespace ecs {

 struct model_component
 {
 	model* model;
 	std::unordered_map<int, material*> materials;
 	int instance_count;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_MODEL_COMPONENT_HPP

--- a/src/antkeeper/entity/components/nest-component.hpp
+++ b/src/antkeeper/entity/components/nest-component.hpp
@ -0,0 +1,33 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_NEST_COMPONENT_HPP
 #define ANTKEEPER_ECS_NEST_COMPONENT_HPP

 namespace ecs {

 struct nest_component
 {
 	int bla;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_NEST_COMPONENT_HPP

--- a/src/antkeeper/entity/components/placement-component.hpp
+++ b/src/antkeeper/entity/components/placement-component.hpp
@ -0,0 +1,35 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP
 #define ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP

 #include "geometry/ray.hpp"

 namespace ecs {

 struct placement_component
 {
 	::ray<float> ray;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_PLACEMENT_COMPONENT_HPP

--- a/src/antkeeper/entity/components/samara-component.hpp
+++ b/src/antkeeper/entity/components/samara-component.hpp
@ -0,0 +1,38 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_SAMARA_COMPONENT_HPP
 #define ANTKEEPER_ECS_SAMARA_COMPONENT_HPP

 #include <vmq/vmq.hpp>
 using namespace vmq::types;

 namespace ecs {

 struct samara_component
 {
 	float3 direction;
 	float angle;
 	float chirality;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_SAMARA_COMPONENT_HPP

--- a/src/antkeeper/entity/components/terrain-component.hpp
+++ b/src/antkeeper/entity/components/terrain-component.hpp
@ -0,0 +1,35 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_TERRAIN_COMPONENT_HPP
 #define ANTKEEPER_ECS_TERRAIN_COMPONENT_HPP

 namespace ecs {

 struct terrain_component
 {
 	int subdivisions;
 	int x;
 	int z;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_TERRAIN_COMPONENT_HPP

--- a/src/antkeeper/entity/components/tool-component.hpp
+++ b/src/antkeeper/entity/components/tool-component.hpp
@ -0,0 +1,33 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_TOOL_COMPONENT_HPP
 #define ANTKEEPER_ECS_TOOL_COMPONENT_HPP

 namespace ecs {

 struct tool_component
 {
 	bool active;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_TOOL_COMPONENT_HPP

--- a/src/antkeeper/entity/components/transform-component.hpp
+++ b/src/antkeeper/entity/components/transform-component.hpp
@ -0,0 +1,36 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ECS_TRANSFORM_COMPONENT_HPP
 #define ANTKEEPER_ECS_TRANSFORM_COMPONENT_HPP

 #include <vmq/vmq.hpp>

 namespace ecs {

 struct transform_component
 {
 	vmq::transform<float> transform;
 	bool warp;
 };

 } // namespace ecs

 #endif // ANTKEEPER_ECS_TRANSFORM_COMPONENT_HPP

--- a/src/antkeeper/event/event-dispatcher.cpp
+++ b/src/antkeeper/event/event-dispatcher.cpp
@ -0,0 +1,107 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "event-dispatcher.hpp"

 event_dispatcher::event_dispatcher()
 {}

 event_dispatcher::~event_dispatcher()
 {
 	clear();
 }

 void event_dispatcher::update(double time)
 {
 	// Process pending subscriptions
 	for (auto it = to_subscribe.begin(); it != to_subscribe.end(); ++it)
 	{
 		handler_map[std::get<0>(*it)].push_back(std::get<1>(*it));
 	}
 	to_subscribe.clear();

 	// Process pending unsubscriptions
 	for (auto it = to_unsubscribe.begin(); it != to_unsubscribe.end(); ++it)
 	{
 		handler_map[std::get<0>(*it)].remove(std::get<1>(*it));
 	}
 	to_unsubscribe.clear();

 	// Dispatch queued events
 	flush();

 	// For each scheduled event
 	for (auto event = scheduled_events.begin(); event != scheduled_events.end();)
 	{
 		// If the event is due
 		if (time >= event->first)
 		{
 			// Dispatch event
 			dispatch(*(event->second));

 			// Delete event
 			delete event->second;
 			event = scheduled_events.erase(event);
 		}
 		else
 		{
 			break;
 		}
 	}
 }

 void event_dispatcher::flush()
 {
 	// For each event in the queue
 	for (auto event = queued_events.begin(); event != queued_events.end(); ++event)
 	{
 		// Dispatch event
 		dispatch(**event);

 		// Delete event
 		delete (*event);
 	}

 	// Clear event queue
 	queued_events.clear();
 }

 void event_dispatcher::clear()
 {
 	// For each event in the queue
 	for (auto event = queued_events.begin(); event != queued_events.end(); ++event)
 	{
 		// Delete event
 		delete (*event);
 	}

 	// Clear event queue
 	queued_events.clear();

 	// For each scheduled event
 	for (auto event = scheduled_events.begin(); event != scheduled_events.end(); ++event)
 	{
 		// Delete event
 		delete event->second;
 	}

 	// Clear scheduled events
 	scheduled_events.clear();
 }

--- a/src/antkeeper/event/event-dispatcher.hpp
+++ b/src/antkeeper/event/event-dispatcher.hpp
@ -0,0 +1,138 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_EVENT_DISPATCHER_HPP
 #define ANTKEEPER_EVENT_DISPATCHER_HPP

 #include "event.hpp"
 #include "event-handler.hpp"
 #include <cstdlib>
 #include <list>
 #include <map>

 /**
 * Queues events and dispatches them to event handlers.
 */
 class event_dispatcher
 {
 public:
 	/// Creates an event dispatcher
 	event_dispatcher();

 	/// Destroys an event dispatcher
 	~event_dispatcher();

 	/**
 	 * Processes all pending subscriptions and unsubscriptions, dispatches queued events, then dispatches due scheduled events.
 	 *
 	 * @param time The current time.
 	 */
 	void update(double time);

 	/**
 	 * Subscribes an event handler to event dispatches.
 	 *
 	 * @param handler Handler to subscribe.
 	 */
 	template <typename T>
 	void subscribe(event_handler<T>* handler);

 	/**
 	 * Unsubscribes an event handler from event dispatches.
 	 *
 	 * @param handler Handler to unsubscribe.
 	 */
 	template <typename T>
 	void unsubscribe(event_handler<T>* handler);

 	/**
 	 * Adds an event to the queue.
 	 *
 	 * @param event Event to queue.
 	 */
 	void queue(const event_base& event);

 	/**
 	 * Schedules an event to be dispatched at a specific time.
 	 *
 	 * @param event Event to schedule.
 	 * @param time Time that the event should be dispatched.
 	 */
 	void schedule(const event_base& event, double time);

 	/**
 	 * Dispatches a single event.
 	 *
 	 * @param event Event to dispatch.
 	 */
 	void dispatch(const event_base& event);

 	/**
 	 * Dispatches all events in the queue.
 	 */
 	void flush();

 	/// Removes all queued and scheduled events from the queue without notifying handlers.
 	void clear();

 private:
 	std::list<std::tuple<std::size_t, event_handler_base*>> to_subscribe;
 	std::list<std::tuple<std::size_t, event_handler_base*>> to_unsubscribe;
 	std::map<std::size_t, std::list<event_handler_base*>> handler_map;
 	std::list<event_base*> queued_events;
 	std::multimap<double, event_base*> scheduled_events;
 };

 template <typename T>
 void event_dispatcher::subscribe(event_handler<T>* handler)
 {
 	to_subscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
 }

 template <typename T>
 void event_dispatcher::unsubscribe(event_handler<T>* handler)
 {
 	to_unsubscribe.push_back(std::make_tuple(handler->get_handled_event_type_id(), handler));
 }

 inline void event_dispatcher::queue(const event_base& event)
 {
 	queued_events.push_back(event.clone());
 }

 inline void event_dispatcher::schedule(const event_base& event, double time)
 {
 	scheduled_events.insert(std::pair<double, event_base*>(time, event.clone()));
 }

 inline void event_dispatcher::dispatch(const event_base& event)
 {
 	// Get list of handlers for this type of event
 	const std::list<event_handler_base*>& handlers = handler_map[event.get_event_type_id()];

 	// For each handler
 	for (auto handler = handlers.begin(); handler != handlers.end(); ++handler)
 	{
 		// Pass event to the handler
 		(*handler)->route_event(event);
 	}
 }

 #endif // ANTKEEPER_EVENT_DISPATCHER_HPP

--- a/src/antkeeper/event/event-handler.hpp
+++ b/src/antkeeper/event/event-handler.hpp
@ -0,0 +1,83 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_EVENT_HANDLER_HPP
 #define ANTKEEPER_EVENT_HANDLER_HPP

 #include "event.hpp"
 #include <type_traits>

 class event_dispatcher;

 /**
 * Abstract base class for event handlers.
 */
 class event_handler_base
 {
 private:
 	friend class event_dispatcher;

 	/**
 	 * Receives an event, casts it to its derived event type, then handles it.
 	 *
 	 * @param event Received event.
 	 */
 	virtual void route_event(const event_base& event) = 0;
 };

 /**
 * Templates abstract base class for event handlers.
 *
 * @tparam Event type.
 */
 template <typename T>
 class event_handler: public event_handler_base
 {
 public:
 	static_assert(std::is_base_of<event_base, T>::value, "T must be a descendant of event_base.");

 	/// Returns the unique event type identifier for the event type handled by this event handler.
 	const std::size_t get_handled_event_type_id() const;

 	/**
 	 * Handles an event of type T.
 	 *
 	 * @param event Event to handle.
 	 */
 	virtual void handle_event(const T& event) = 0;

 private:
 	/// @copydoc event_handler_base::route_event()
 	virtual void route_event(const event_base& event) final;
 };

 template <typename T>
 inline const std::size_t event_handler<T>::get_handled_event_type_id() const
 {
 	return T::event_type_id;
 }

 template <typename T>
 void event_handler<T>::route_event(const event_base& event)
 {
 	handle_event(static_cast<const T&>(event));
 }

 #endif // ANTKEEPER_EVENT_HANDLER_HPP

--- a/src/antkeeper/event/event.hpp
+++ b/src/antkeeper/event/event.hpp
@ -0,0 +1,85 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_EVENT_HPP
 #define ANTKEEPER_EVENT_HPP

 #include <atomic>
 #include <cstdlib>

 /**
 * Abstract base class for events.
 */
 class event_base
 {
 public:
 	/// Destroys an event base.
 	virtual ~event_base() = default;

 	/// Returns the unique event type identifier for this event type.
 	virtual const std::size_t get_event_type_id() const = 0;

 	/**
 	 * Allocates a copy of this event.
 	 *
 	 * @return Newly allocated copy of this event.
 	 */
 	virtual event_base* clone() const = 0;

 protected:
 	/// Returns then increments the next available event type ID.
 	static std::size_t next_event_type_id();
 };

 inline std::size_t event_base::next_event_type_id()
 {
 	static std::atomic<std::size_t> next_event_type_id{0};
 	return next_event_type_id++;
 }

 /**
 * Templated abstract base class for events.
 *
 * @tparam T The derived class.
 */
 template <typename T>
 class event: public event_base
 {
 public:
 	/// The unique event type identifier for this event type.
 	static const std::atomic<std::size_t> event_type_id;

 	/// Destroys an event
 	virtual ~event() = default;

 	virtual const std::size_t get_event_type_id() const final;
 	virtual event_base* clone() const = 0;
 };

 template <typename T>
 const std::atomic<std::size_t> event<T>::event_type_id{event_base::next_event_type_id()};

 template <typename T>
 inline const std::size_t event<T>::get_event_type_id() const
 {
 	return event_type_id;
 }

 #endif // ANTKEEPER_EVENT_HPP

--- a/src/antkeeper/filesystem.cpp
+++ b/src/antkeeper/filesystem.cpp
@ -1,20 +1,20 @@
 /*
 * Copyright (C) 2017-2019  Christopher J. Howard
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 * This file is part of Antkeeper source code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "filesystem.hpp"
@ -49,9 +49,9 @@
 	}
 #endif

 std::string getExecutablePath()
 std::string get_executable_path()
 {
 	std::string executablePath;
 	std::string executable_path;
 	
 	#if defined(_WIN32)
 		// Get executable path on Windows
@ -59,7 +59,7 @@ std::string getExecutablePath()
 		std::wstring wpath(MAX_PATH, L'\0');
 		GetModuleFileNameW(hModule, &wpath[0], MAX_PATH);
 		wpath.erase(std::find(wpath.begin(), wpath.end(), L'\0'), wpath.end());
 		executablePath = narrow(wpath);
 		executable_path = narrow(wpath);
 	#else
 		// Get executable path on Linux
 		char path[PATH_MAX];
@ -67,45 +67,45 @@ std::string getExecutablePath()
 		if (length != -1)
 		{
 			path[length] = '\0';
 			executablePath = path;
 			executable_path = path;
 		}
 	#endif

 	return executablePath;
 	return executable_path;
 }

 std::string getDataPath(const std::string& applicationName)
 std::string get_data_path(const std::string& application_name)
 {
 	std::string dataPath;
 	std::string data_path;
 	
 	#if defined(_WIN32)
 		std::string executablePath = getExecutablePath();
 		std::size_t delimeter =  executablePath.find_last_of("\\/") + 1;
 		dataPath = executablePath.substr(0, delimeter);
 		std::string executable_path = get_executable_path();
 		std::size_t delimeter =  executable_path.find_last_of("\\/") + 1;
 		data_path = executable_path.substr(0, delimeter);
 	#else
 		std::string executablePath = getExecutablePath();
 		std::size_t delimeter =  executablePath.find_last_of("\\/") + 1;
 		dataPath = executablePath.substr(0, delimeter) + std::string("../share/") + applicationName + std::string("/");
 		std::string executable_path = get_executable_path();
 		std::size_t delimeter =  executable_path.find_last_of("\\/") + 1;
 		data_path = executable_path.substr(0, delimeter) + std::string("../share/") + application_name + std::string("/");
 	#endif
 	
 	return dataPath;
 	return data_path;
 }

 std::string getConfigPath(const std::string& applicationName)
 std::string get_config_path(const std::string& application_name)
 {
 	std::string configPath;
 	std::string config_path;
 	
 	#if defined(_WIN32)
 		std::wstring wpath(MAX_PATH, L'\0');
 		if (SHGetSpecialFolderPathW(nullptr, &wpath[0], CSIDL_LOCAL_APPDATA, FALSE))
 		{
 			wpath.erase(std::find(wpath.begin(), wpath.end(), L'\0'), wpath.end());
 			configPath = narrow(wpath);
 			configPath += std::string("\\") + applicationName + std::string("\\");
 			config_path = narrow(wpath);
 			config_path += std::string("\\") + application_name + std::string("\\");
 		}
 	#else
 		// Determine home path
 		std::string homePath = std::string(getpwuid(getuid())->pw_dir);
 		std::string home_path = std::string(getpwuid(getuid())->pw_dir);

 		// Determine config path
 		char* xdgConfigHome = std::getenv("XDG_CONFIG_HOME");
@ -113,18 +113,18 @@ std::string getConfigPath(const std::string& applicationName)
 		{
 			// Default to $HOME/.config/ as per:
 			// https://specifications.freedesktop.org/basedir-spec/basedir-spec-latest.html#variables
 			configPath = homePath + std::string("/.config/") + applicationName + std::string("/");
 			config_path = home_path + std::string("/.config/") + application_name + std::string("/");
 		}
 		else
 		{
 			configPath = xdgConfigHome + std::string("/") + applicationName + std::string("/");
 			config_path = xdgConfigHome + std::string("/") + application_name + std::string("/");
 		}
 	#endif
 	
 	return configPath;
 	return config_path;
 }

 bool pathExists(const std::string& path)
 bool path_exists(const std::string& path)
 {
 	#if defined(_WIN32)
 		std::wstring wpath = widen(path);
@ -136,7 +136,7 @@ bool pathExists(const std::string& path)
 	#endif
 }

 bool createDirectory(const std::string& path)
 bool create_directory(const std::string& path)
 {
 	#if defined(_WIN32)
 		std::wstring wpath = widen(path);
@ -145,3 +145,4 @@ bool createDirectory(const std::string& path)
 		return (mkdir(path.c_str(), 0777) == 0);
 	#endif
 }

--- a/src/antkeeper/filesystem.hpp
+++ b/src/antkeeper/filesystem.hpp
@ -1,24 +1,24 @@
 /*
 * Copyright (C) 2017-2019  Christopher J. Howard
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 * This file is part of Antkeeper source code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef FILESYSTEM_HPP
 #define FILESYSTEM_HPP
 #ifndef ANTKEEPER_FILESYSTEM_HPP
 #define ANTKEEPER_FILESYSTEM_HPP

 #include <string>

@ -27,35 +27,35 @@
 *
 * @return Path to the application's executable.
 */
 std::string getExecutablePath();
 std::string get_executable_path();

 /**
 * Returns the absolute path to the directory containing application data.
 *
 * Windows: executableDirectory
 * GNU/Linux: executableDirectory/../share/applicationName/
 * Windows: executable_directory
 * GNU/Linux: executable_directory/../share/applicationName/
 *
 * @param applicationName Name of the application.
 * @param application_name Name of the application.
 * @return Path to the application's data directory.
 */
 std::string getDataPath(const std::string& applicationName);
 std::string get_data_path(const std::string& application_name);

 /**
 * Returns the absolute path to the directory containing user-specific application data.
 *
 * Windows: %LOCALAPPDATA%\applicationName\
 * GNU/Linux: $XDG_CONFIG_HOME/applicationName/ or ~/.config/applicationName/ if $XDG_CONFIG_HOME is not set.
 * Windows: %LOCALAPPDATA%\application_name\
 * GNU/Linux: $XDG_CONFIG_HOME/application_name/ or ~/.config/application_name/ if $XDG_CONFIG_HOME is not set.
 *
 * @param applicationName Name of the application.
 * @param application_name Name of the application.
 * @return Path to the application's config directory.
 */
 std::string getConfigPath(const std::string& applicationName);
 std::string get_config_path(const std::string& application_name);

 /// Checks if a file or directory exists
 bool pathExists(const std::string& path);
 bool path_exists(const std::string& path);

 /// Creates a directory
 bool createDirectory(const std::string& path);
 bool create_directory(const std::string& path);

 #endif // FILESYSTEM_HPP
 #endif // ANTKEEPER_FILESYSTEM_HPP

--- a/src/antkeeper/frame-scheduler.cpp
+++ b/src/antkeeper/frame-scheduler.cpp
@ -0,0 +1,85 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "frame-scheduler.hpp"
 #include <algorithm>

 frame_scheduler::frame_scheduler():
 	update_callback(nullptr),
 	render_callback(nullptr),
 	update_rate(60.0),
 	update_timestep(1.0 / update_rate),
 	max_frame_duration(update_timestep)
 {
 	reset();
 }

 void frame_scheduler::set_update_callback(std::function<void(double, double)> callback)
 {
 	update_callback = callback;
 }

 void frame_scheduler::set_render_callback(std::function<void(double)> callback)
 {
 	render_callback = callback;
 }

 void frame_scheduler::set_update_rate(double frequency)
 {
 	update_rate = frequency;
 	update_timestep = 1.0 / frequency;
 }

 void frame_scheduler::set_max_frame_duration(double duration)
 {
 	max_frame_duration = duration;
 }

 double frame_scheduler::get_frame_duration() const
 {
 	return frame_duration;
 }

 void frame_scheduler::reset()
 {
 	elapsed_time = 0.0;
 	accumulator = 0.0;
 	frame_start = std::chrono::high_resolution_clock::now();
 	frame_end = frame_start;
 	frame_duration = 0.0;
 }

 void frame_scheduler::tick()
 {
 	accumulator += std::min<double>(max_frame_duration, frame_duration);

 	while (accumulator >= update_timestep)
 	{
 		update_callback(elapsed_time, update_timestep);
 		elapsed_time += update_timestep;
 		accumulator -= update_timestep;
 	}

 	render_callback(accumulator * update_rate);

 	frame_end = std::chrono::high_resolution_clock::now();
 	frame_duration = static_cast<double>(std::chrono::duration_cast<std::chrono::microseconds>(frame_end - frame_start).count()) / 1000000.0;
 	frame_start = frame_end;
 }

--- a/src/antkeeper/frame-scheduler.hpp
+++ b/src/antkeeper/frame-scheduler.hpp
@ -0,0 +1,91 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_FRAME_SCHEDULER_HPP
 #define ANTKEEPER_FRAME_SCHEDULER_HPP

 #include <chrono>
 #include <functional>

 /**
 * Schedules fixed-timestep update calls and variable timestep render calls.
 */
 class frame_scheduler
 {
 public:
 	frame_scheduler();

 	/**
 	 * Sets the update callback.
 	 *
 	 * @param callback Function which takes two parameters: `t`, the total elapsed time, and `dt`, delta time (timestep) which is calculated as `1.0 / update_rate`. This function will be called at the frequency specified by `frame_scheduler::set_update_rate()`.
 	 */
 	void set_update_callback(std::function<void(double, double)> callback);

 	/**
 	 * Sets the render callback.
 	 *
 	 * @param callback Function which takes one parameter: `alpha`, which is a factor that can be used to interpolate between the previous and current update states.
 	 */
 	void set_render_callback(std::function<void(double)> callback);

 	/**
 	 * Sets the update rate.
 	 *
 	 * @param frequency Frequency, in hertz, at which the update callback should be called.
 	 */
 	void set_update_rate(double frequency);

 	/**
 	 * Sets the maximum duration of a frame. This limits the number of times the update callback is called per frame, thereby preventing a "spiral of death", in which the update callback is called too many times per frame while trying to catch up to the target update rate.
 	 *
 	 * @param duration Maximum frame duration, in seconds..
 	 */
 	void set_max_frame_duration(double duration);

 	/**
 	 * Returns the duration of the last frame, in seconds.
 	 */
 	double get_frame_duration() const;

 	/**
 	 * Resets the total elapsed time, frame duration, and internal timers.
 	 */
 	void reset();

 	/**
 	 * Updates the internal timers and performs the scheduled update and render callbacks.
 	 */
 	void tick();

 private:
 	std::function<void(double, double)> update_callback;
 	std::function<void(double)> render_callback;
 	double update_rate;
 	double update_timestep;
 	double max_frame_duration;
 	double elapsed_time;
 	double accumulator;
 	std::chrono::high_resolution_clock::time_point frame_start;
 	std::chrono::high_resolution_clock::time_point frame_end;
 	double frame_duration;
 };

 #endif // ANTKEEPER_FRAME_SCHEDULER_HPP

--- a/src/antkeeper/geometry/aabb.hpp
+++ b/src/antkeeper/geometry/aabb.hpp
@ -0,0 +1,201 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_AABB_HPP
 #define ANTKEEPER_AABB_HPP

 #include "bounding-volume.hpp"
 #include "sphere.hpp"
 #include <vmq/vmq.hpp>
 #include <array>
 #include <limits>

 using vmq::vector;
 using vmq::matrix;
 using vmq::transform;
 using namespace vmq::operators;

 template <class T>
 struct aabb: public bounding_volume<T>
 {
 	vector<T, 3> min_point;
 	vector<T, 3> max_point;
 	
 	/**
 	 * Transforms an AABB.
 	 *
 	 * @param a AABB to be transformed.
 	 * @param t Transform by which the AABB should be transformed.
 	 * @return Transformed AABB.
 	 */
 	static aabb transform(const aabb& a, const ::transform<T>& t);
 	
 	/**
 	 * Transforms an AABB.
 	 *
 	 * @param a AABB to be transformed.
 	 * @param m Matrix by which the AABB should be transformed.
 	 * @return Transformed AABB.
 	 */
 	static aabb transform(const aabb& a, const matrix<T, 4, 4>& m);
 	
 	aabb(const vector<T, 3>& min_point, const vector<T, 3>& max_point);
 	aabb();
 	
 	virtual bounding_volume_type get_bounding_volume_type() const;
 	virtual bool intersects(const sphere<T>& sphere) const;
 	virtual bool intersects(const aabb<T>& aabb) const;
 	virtual bool contains(const sphere<T>& sphere) const;
 	virtual bool contains(const aabb<T>& aabb) const;
 	virtual bool contains(const vector<T, 3>& point) const;

 	/**
 	 * Returns the position of the specified corner.
 	 *
 	 * @param index Index of a corner.
 	 * @return Position of the specified corner.
 	 */
 	vector<T, 3> corner(int index) const noexcept;
 };

 template <class T>
 aabb<T> aabb<T>::transform(const aabb& a, const ::transform<T>& t)
 {
 	vector<T, 3> min_point = {std::numeric_limits<T>::infinity(), std::numeric_limits<T>::infinity(), std::numeric_limits<T>::infinity()};
 	vector<T, 3> max_point = {-std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity()};
 	
 	for (std::size_t i = 0; i < 8; ++i)
 	{
 		vector<T, 3> transformed_corner = vmq::mul(t, a.corner(i));

 		for (std::size_t j = 0; j < 3; ++j)
 		{
 			min_point[j] = std::min<T>(min_point[j], transformed_corner[j]);
 			max_point[j] = std::max<T>(max_point[j], transformed_corner[j]);
 		}
 	}

 	return {min_point, max_point};
 }

 template <class T>
 aabb<T> aabb<T>::transform(const aabb& a, const matrix<T, 4, 4>& m)
 {
 	vector<T, 3> min_point = {std::numeric_limits<T>::infinity(), std::numeric_limits<T>::infinity(), std::numeric_limits<T>::infinity()};
 	vector<T, 3> max_point = {-std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity(), -std::numeric_limits<T>::infinity()};
 	
 	for (std::size_t i = 0; i < 8; ++i)
 	{
 		vector<T, 3> corner = a.corner(i);
 		vector<T, 4> transformed_corner = vmq::mul(m, vector<T, 4>{corner.x, corner.y, corner.z, T(1)});

 		for (std::size_t j = 0; j < 3; ++j)
 		{
 			min_point[j] = std::min<T>(min_point[j], transformed_corner[j]);
 			max_point[j] = std::max<T>(max_point[j], transformed_corner[j]);
 		}
 	}

 	return {min_point, max_point};
 }

 template <class T>
 aabb<T>::aabb(const vector<T, 3>& min_point, const vector<T, 3>& max_point):
 	min_point(min_point),
 	max_point(max_point)
 {}

 template <class T>
 aabb<T>::aabb()
 {}

 template <class T>
 inline bounding_volume_type aabb<T>::get_bounding_volume_type() const
 {
 	return bounding_volume_type::aabb;
 }

 template <class T>
 bool aabb<T>::intersects(const sphere<T>& sphere) const
 {
 	const vector<T, 3> radius_vector = {sphere.radius, sphere.radius, sphere.radius};
 	return aabb<T>(min_point - radius_vector, max_point + radius_vector).contains(sphere.center);
 }

 template <class T>
 bool aabb<T>::intersects(const aabb<T>& aabb) const
 {
 	if (max_point.x < aabb.min_point.x || min_point.x > aabb.max_point.x)
 		return false;
 	if (max_point.y < aabb.min_point.y || min_point.y > aabb.max_point.y)
 		return false;
 	if (max_point.z < aabb.min_point.z || min_point.z > aabb.max_point.z)
 		return false;
 	return true;
 }

 template <class T>
 bool aabb<T>::contains(const sphere<T>& sphere) const
 {
 	if (sphere.center.x - sphere.radius < min_point.x || sphere.center.x + sphere.radius > max_point.x)
 		return false;
 	if (sphere.center.y - sphere.radius < min_point.y || sphere.center.y + sphere.radius > max_point.y)
 		return false;
 	if (sphere.center.z - sphere.radius < min_point.z || sphere.center.z + sphere.radius > max_point.z)
 		return false;
 	return true;
 }

 template <class T>
 bool aabb<T>::contains(const aabb<T>& aabb) const
 {
 	if (aabb.min_point.x < min_point.x || aabb.max_point.x > max_point.x)
 		return false;
 	if (aabb.min_point.y < min_point.y || aabb.max_point.y > max_point.y)
 		return false;
 	if (aabb.min_point.z < min_point.z || aabb.max_point.z > max_point.z)
 		return false;
 	return true;
 }

 template <class T>
 bool aabb<T>::contains(const vector<T, 3>& point) const
 {
 	if (point.x < min_point.x || point.x > max_point.x)
 		return false;
 	if (point.y < min_point.y || point.y > max_point.y)
 		return false;
 	if (point.z < min_point.z || point.z > max_point.z)
 		return false;
 	return true;
 }

 template <class T>
 vector<T, 3> aabb<T>::corner(int index) const noexcept
 {
 	return
 		{
 			((index >> 2) & 1) ? max_point[0] : min_point[0],
 			((index >> 1) & 1) ? max_point[1] : min_point[1],
 			((index >> 0) & 1) ? max_point[2] : min_point[2]
 		};
 }

 #endif // ANTKEEPER_AABB_HPP

--- a/src/antkeeper/geometry/bounding-volume.hpp
+++ b/src/antkeeper/geometry/bounding-volume.hpp
@ -0,0 +1,94 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_BOUNDING_VOLUME_HPP
 #define ANTKEEPER_BOUNDING_VOLUME_HPP

 #include <stdexcept>
 #include <vmq/vmq.hpp>

 using vmq::vector;

 template <class T>
 struct sphere;
 template <class T>
 struct aabb;

 /// Enumerates bounding volume types.
 enum class bounding_volume_type
 {
 	aabb, ///< Indicates the bounding volume is an axis-aligned bounding box.
 	sphere, ///< Indicates the bounding volume is a sphere.
 	convex_hull ///< Indicates the bounding volume is a convex hull.
 };

 /**
 * Abstract base class for bounding volumes.
 *
 * @tparam T Scalar type.
 */
 template <class T>
 class bounding_volume
 {
 public:
 	/// Returns the enumerated type of this bounding volume.
 	virtual bounding_volume_type get_bounding_volume_type() const = 0;
 	
 	/// Tests for intersection between this bounding volume and a bounding sphere.
 	virtual bool intersects(const sphere<T>& sphere) const = 0;
 	
 	/// Tests for intersection between this bounding volume and an axis-aligned bounding box.
 	virtual bool intersects(const aabb<T>& aabb) const = 0;
 	
 	/// Tests whether this bounding volume contains a sphere.
 	virtual bool contains(const sphere<T>& sphere) const = 0;
 	
 	/// Tests whether this bounding volume contains an axis-aligned bounding box.
 	virtual bool contains(const aabb<T>& aabb) const = 0;
 	
 	/// Tests whether this bounding volume contains a point.
 	virtual bool contains(const vector<T, 3>& point) const = 0;
 	
 	/// Tests for intersection between this bounding volume and another bounding volume.
 	bool intersects(const bounding_volume& volume) const;
 };

 /// Tests for intersection between this bounding volume and another bounding volume.
 template <class T>
 bool bounding_volume<T>::intersects(const bounding_volume& volume) const
 {
 	const bounding_volume_type type = volume.get_bounding_volume_type();
 	switch (type)
 	{
 		case bounding_volume_type::sphere:
 			return intersects(static_cast<const sphere<T>&>(volume));
 			break;
 		
 		case bounding_volume_type::aabb:
 			return intersects(static_cast<const aabb<T>&>(volume));
 			break;
 		
 		default:
 			throw std::runtime_error("unimplemented");
 			break;
 	}
 }

 #endif // ANTKEEPER_BOUNDING_VOLUME_HPP

--- a/src/antkeeper/geometry/convex-hull.hpp
+++ b/src/antkeeper/geometry/convex-hull.hpp
@ -0,0 +1,139 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CONVEX_HULL_HPP
 #define ANTKEEPER_CONVEX_HULL_HPP

 #include <cstdlib>
 #include <vector>
 #include "bounding-volume.hpp"
 #include "plane.hpp"
 #include "sphere.hpp"
 #include "aabb.hpp"

 /**
 * A plane-bounded convex hull.
 */
 template <class T>
 struct convex_hull: public bounding_volume<T>
 {
 	/// Vector of planes with descibe the bounds of the convex hull.
 	std::vector<plane<T>> planes;
 	
 	/**
 	 * Creates a convex hull.
 	 *
 	 * @param size Number of planes the convex hull should accommodate.
 	 */
 	convex_hull(std::size_t size);
 	
 	/// Creates a convex hull.
 	convex_hull();
 	
 	virtual bounding_volume_type get_bounding_volume_type() const;
 	virtual bool intersects(const sphere<T>& sphere) const;
 	virtual bool intersects(const aabb<T>& aabb) const;
 	virtual bool contains(const sphere<T>& sphere) const;
 	virtual bool contains(const aabb<T>& aabb) const;
 	virtual bool contains(const vector<T, 3>& point) const;
 };

 template <class T>
 convex_hull<T>::convex_hull(std::size_t size):
 	planes(size, plane<T>())
 {}

 template <class T>
 convex_hull<T>::convex_hull()
 {}

 template <class T>
 inline bounding_volume_type convex_hull<T>::get_bounding_volume_type() const
 {
 	return bounding_volume_type::convex_hull;
 }

 template <class T>
 bool convex_hull<T>::intersects(const sphere<T>& sphere) const
 {
 	for (const plane<T>& plane: planes)
 		if (signed_distance(plane, sphere.center) < -sphere.radius)
 			return false;
 	return true;
 }

 template <class T>
 bool convex_hull<T>::intersects(const aabb<T>& aabb) const
 {
 	vector<T, 3> pv;
 	for (const plane<T>& plane: planes)
 	{	
 		pv.x = (plane.normal.x > T(0)) ? aabb.max_point.x : aabb.min_point.x;
 		pv.y = (plane.normal.y > T(0)) ? aabb.max_point.y : aabb.min_point.y;
 		pv.z = (plane.normal.z > T(0)) ? aabb.max_point.z : aabb.min_point.z;
 		if (signed_distance(plane, pv) < T(0))
 			return false;
 	}
 	
 	return true;
 }

 template <class T>
 bool convex_hull<T>::contains(const sphere<T>& sphere) const
 {
 	for (const plane<T>& plane: planes)
 		if (signed_distance(plane, sphere.center) < sphere.radius)
 			return false;
 	return true;
 }

 template <class T>
 bool convex_hull<T>::contains(const aabb<T>& aabb) const
 {
 	vector<T, 3> pv;
 	vector<T, 3> nv;
 	
 	for (const plane<T>& plane: planes)
 	{
 		pv.x = (plane.normal.x > T(0)) ? aabb.max_point.x : aabb.min_point.x;
 		pv.y = (plane.normal.y > T(0)) ? aabb.max_point.y : aabb.min_point.y;
 		pv.z = (plane.normal.z > T(0)) ? aabb.max_point.z : aabb.min_point.z;
 		nv.x = (plane.normal.x < T(0)) ? aabb.max_point.x : aabb.min_point.x;
 		nv.y = (plane.normal.y < T(0)) ? aabb.max_point.y : aabb.min_point.y;
 		nv.z = (plane.normal.z < T(0)) ? aabb.max_point.z : aabb.min_point.z;
 		
 		if (signed_distance(plane, pv) < T(0) || signed_distance(plane, nv) < T(0))
 			return false;
 	}
 	
 	return true;
 }

 template <class T>
 bool convex_hull<T>::contains(const vector<T, 3>& point) const
 {
 	for (const plane<T>& plane: planes)
 		if (signed_distance(plane, point) < T(0))
 			return false;

 	return true;
 }

 #endif // ANTKEEPER_CONVEX_HULL_HPP

--- a/src/antkeeper/geometry/csg.cpp
+++ b/src/antkeeper/geometry/csg.cpp
@ -0,0 +1,115 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "csg.hpp"
 #include <tuple>

 namespace csg {

 enum class polygon_classification
 {
 	coplanar,
 	front,
 	back,
 	spanning
 };

 /**
 * Classifies a polygon relative to a partitioning plane.
 *
 * @param partition Partitioning plane relative to which the polygon should be classified.
 * @param poly Polygon to be classified.
 * @return Classification of the polygon, relative to the plane.
 */
 static polygon_classification classify_polygon(const plane& partition, const polygon& poly)
 {
 	for (const float3& vertex: poly.vertices)
 	{
 		
 	}

 	return polygon_classification::coplanar;
 }

 /**
 * Splits a polygon along a partitioning plane.
 *
 * @param poly Polygon to split.
 * @param partition Partitioning plane along which the polygon should be split.
 * @return List of polygons which were formed by splitting the specified polygon along the partitioning plane, along with their respective classifications relative to the partition.
 */
 std::list<std::tuple<polygon, polygon_classification>> split_polygon(const polygon& poly, const plane& partition)
 {
 	return {};
 }


 bsp_tree::bsp_tree(const std::list<polygon>& polygons):
 	front(nullptr),
 	back(nullptr)
 {
 	//partition = polygons.front();

 	std::list<polygon> front_polygons;
 	std::list<polygon> back_polygons;

 	// Classify all polygons relative to this node's partitioning plane
 	for (const polygon& p: polygons)
 	{
 		polygon_classification classification = classify_polygon(partition, p);
 		switch (classification)
 		{
 			case polygon_classification::coplanar:
 				coplanar_polygons.push_back(p);
 				break;

 			case polygon_classification::front:
 				front_polygons.push_back(p);
 				break;

 			case polygon_classification::back:
 				back_polygons.push_back(p);
 				break;

 			case polygon_classification::spanning:
 				break;
 		}
 	}

 	if (!front_polygons.empty())
 	{
 		// Make subtree containing all polygons in front of this node's plane
 		front = new bsp_tree(front_polygons);
 	}

 	if (!back_polygons.empty())
 	{
 		// Make subtree containing all polygons behind this node's plane
 		back = new bsp_tree(back_polygons);
 	}
 }

 bsp_tree::~bsp_tree()
 {
 	delete front;
 	delete back;
 }

 } // namespace csg

--- a/src/antkeeper/geometry/csg.hpp
+++ b/src/antkeeper/geometry/csg.hpp
@ -0,0 +1,88 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CSG_HPP
 #define ANTKEEPER_CSG_HPP

 #include <list>
 #include <vmq/vmq.hpp>


 namespace csg {

 using vmq::float3;
 using vmq::float4;

 struct plane
 {
 	float3 normal;
 	float distance;
 };

 struct polygon
 {
 	std::list<float3> vertices;
 	void* shared;
 };

 /**
 * 3D solid represented by a collection of polygons.
 */
 typedef std::list<polygon> solid;

 /**
 * BSP tree node.
 */
 class bsp_tree
 {
 public:
 	/**
 	 * Recursively constructs a BSP tree from a collection of polygons.
 	 *
 	 * @param polygons Collection of polygons from which to create the BSP tree.
 	 */
 	explicit bsp_tree(const std::list<polygon>& polygons);

 	/**
 	 * Destroys a BSP tree.
 	 */
 	~bsp_tree();

 private:
 	/// Partition which separates the front and back polygons.
 	plane partition;

 	/// Set of polygons which are coplanar with the partition.
 	std::list<polygon> coplanar_polygons;

 	/// Subtree containing all polygons in front of the partition.
 	bsp_tree* front;

 	/// Subtree containing all polygons behind the partition.
 	bsp_tree* back;
 };

 solid op_union(const solid& a, const solid& b);
 solid op_difference(const solid& a, const solid& b);
 solid op_intersect(const solid& a, const solid& b);

 } // namespace csg

 #endif // ANTKEEPER_CSG_HPP

--- a/src/antkeeper/geometry/intersection.cpp
+++ b/src/antkeeper/geometry/intersection.cpp
@ -0,0 +1,184 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "intersection.hpp"
 #include <limits>

 std::tuple<bool, float> ray_plane_intersection(const ray<float>& ray, const plane<float>& plane)
 {
 	float denom = vmq::dot(ray.direction, plane.normal);
 	if (denom != 0.0f)
 	{
 		float t = -(vmq::dot(ray.origin, plane.normal) + plane.distance) / denom;
 		
 		if (t >= 0.0f)
 		{
 			return std::make_tuple(true, t);
 		}
 	}
 	
 	return std::make_tuple(false, std::numeric_limits<float>::infinity());
 }

 std::tuple<bool, float, float, float> ray_triangle_intersection(const ray<float>& ray, const float3& a, const float3& b, const float3& c)
 {
 	// Find edges
 	float3 edge10 = b - a;
 	float3 edge20 = c - a;

 	// Calculate determinant
 	float3 pv = vmq::cross(ray.direction, edge20);
 	float det = vmq::dot(edge10, pv);

 	if (!det)
 	{
 		return std::make_tuple(false, std::numeric_limits<float>::infinity(), 0.0f, 0.0f);
 	}

 	float inverse_det = 1.0f / det;

 	// Calculate u
 	float3 tv = ray.origin - a;
 	float u = vmq::dot(tv, pv) * inverse_det;
 	
 	if (u < 0.0f || u > 1.0f)
 	{
 		return std::make_tuple(false, std::numeric_limits<float>::infinity(), 0.0f, 0.0f);
 	}

 	// Calculate v
 	float3 qv = vmq::cross(tv, edge10);
 	float v = vmq::dot(ray.direction, qv) * inverse_det;

 	if (v < 0.0f || u + v > 1.0f)
 	{
 		return std::make_tuple(false, std::numeric_limits<float>::infinity(), 0.0f, 0.0f);
 	}

 	// Calculate t
 	float t = vmq::dot(edge20, qv) * inverse_det;

 	if (t > 0.0f)
 	{
 		return std::make_tuple(true, t, u, v);
 	}

 	return std::make_tuple(false, std::numeric_limits<float>::infinity(), 0.0f, 0.0f);
 }

 std::tuple<bool, float, float> ray_aabb_intersection(const ray<float>& ray, const aabb<float>& aabb)
 {
 	float t0 = -std::numeric_limits<float>::infinity();
 	float t1 = std::numeric_limits<float>::infinity();
 	
 	for (std::size_t i = 0; i < 3; ++i)
 	{
 		if (ray.direction[i] == 0.0f)
 		{
 			if (ray.origin[i] < aabb.min_point[i] || ray.origin[i] > aabb.max_point[i])
 			{
 				return std::make_tuple(false, std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity());	
 			}
 		}
 		else
 		{
 			float tmin = (aabb.min_point[i] - ray.origin[i]) / ray.direction[i];
 			float tmax = (aabb.max_point[i] - ray.origin[i]) / ray.direction[i];
 			
 			t0 = std::max(t0, std::min(tmin, tmax));
 			t1 = std::min(t1, std::max(tmin, tmax));
 		}
 	}
 	
 	if (t0 > t1 || t1 < 0.0f)
 	{
 		return std::make_tuple(false, std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity());
 	}
 	
 	return std::make_tuple(true, t0, t1);
 }

 std::tuple<bool, float, float, std::size_t, std::size_t> ray_mesh_intersection(const ray<float>& ray, const mesh& mesh)
 {
 	const std::vector<mesh::face*>& triangles = mesh.get_faces();
 	
 	bool intersection = false;
 	float t0 = std::numeric_limits<float>::infinity();
 	float t1 = -std::numeric_limits<float>::infinity();
 	std::size_t index0 = triangles.size();
 	std::size_t index1 = triangles.size();

 	for (std::size_t i = 0; i < triangles.size(); ++i)
 	{
 		const mesh::face* triangle = triangles[i];

 		const float3& a = reinterpret_cast<const float3&>(triangle->edge->vertex->position);
 		const float3& b = reinterpret_cast<const float3&>(triangle->edge->next->vertex->position);
 		const float3& c = reinterpret_cast<const float3&>(triangle->edge->previous->vertex->position);

 		auto result = ray_triangle_intersection(ray, a, b, c);

 		if (std::get<0>(result))
 		{
 			intersection = true;
 			float t = std::get<1>(result);

 			if (t < t0)
 			{
 				t0 = t;
 				index0 = i;
 			}

 			if (t > t1)
 			{
 				t1 = t;
 				index1 = i;
 			}
 		}
 	}

 	return std::make_tuple(intersection, t0, t1, index0, index1);
 }

 bool aabb_aabb_intersection(const aabb<float>& a, const aabb<float>& b)
 {
 	if (a.max_point.x < b.min_point.x || a.min_point.x > b.max_point.x)
 		return false;
 	if (a.max_point.y < b.min_point.y || a.min_point.y > b.max_point.y)
 		return false;
 	if (a.max_point.z < b.min_point.z || a.min_point.z > b.max_point.z)
 		return false;
 	return true;
 }

 bool aabb_sphere_intersection(const aabb<float>& aabb, const float3& center, float radius)
 {
 	float distance_squared = 0.0f;
 	for (int i = 0; i < 3; ++i)
 	{
 		float v = center[i];
 		if (v < aabb.min_point[i])
 			distance_squared += (aabb.min_point[i] - v) * (aabb.min_point[i] - v);
 		if (v > aabb.max_point[i])
 			distance_squared += (v - aabb.max_point[i]) * (v - aabb.max_point[i]);
 	}

 	return (distance_squared <= (radius * radius));
 }

--- a/src/antkeeper/geometry/intersection.hpp
+++ b/src/antkeeper/geometry/intersection.hpp
@ -0,0 +1,54 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_INTERSECTION_HPP
 #define ANTKEEPER_INTERSECTION_HPP

 #include <tuple>
 #include <vmq/vmq.hpp>
 #include "aabb.hpp"
 #include "mesh.hpp"
 #include "plane.hpp"
 #include "ray.hpp"

 using namespace vmq::types;
 using namespace vmq::operators;


 /**
 * Tests for intersection between a ray and a plane.
 *
 * @param ray Ray to test for intersection.
 * @param plane Plane to test for intersection.
 * @return Tuple containing a boolean indicating whether intersection occurred, and a float indicating the signed distance along the ray to the point of intersection.
 */
 std::tuple<bool, float> ray_plane_intersection(const ray<float>& ray, const plane<float>& plane);

 std::tuple<bool, float, float, float> ray_triangle_intersection(const ray<float>& ray, const float3& a, const float3& b, const float3& c);

 std::tuple<bool, float, float> ray_aabb_intersection(const ray<float>& ray, const aabb<float>& aabb);

 std::tuple<bool, float, float, std::size_t, std::size_t> ray_mesh_intersection(const ray<float>& ray, const mesh& mesh);

 bool aabb_sphere_intersection(const aabb<float>& aabb, const float3& center, float radius);

 bool aabb_aabb_intersection(const aabb<float>& a, const aabb<float>& b);

 #endif // ANTKEEPER_INTERSECTION_HPP

--- a/src/antkeeper/geometry/mesh-accelerator.cpp
+++ b/src/antkeeper/geometry/mesh-accelerator.cpp
@ -0,0 +1,179 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "mesh-accelerator.hpp"
 #include "mesh-functions.hpp"
 #include "morton.hpp"
 #include <iostream>
 #include <bitset>

 mesh_accelerator::mesh_accelerator()
 {}

 void mesh_accelerator::build(const mesh& mesh)
 {
 	// Clear octree and face map
 	octree.clear();
 	face_map.clear();

 	// Calculate mesh dimensions
 	aabb<float> bounds = calculate_bounds(mesh);
 	float3 mesh_dimensions = bounds.max_point - bounds.min_point;
 	center_offset = mesh_dimensions * 0.5f - (bounds.min_point + bounds.max_point) * 0.5f;

 	// Calculate node dimensions at each octree depth
 	for (auto i = 0; i <= octree32::max_depth; ++i)
 	{
 		node_dimensions[i] = mesh_dimensions * static_cast<float>((1.0f / std::pow(2, i)));
 	}

 	// Add faces to octree
 	for (mesh::face* face: mesh.get_faces())
 	{
 		// Calculate face bounds
 		float3 min_point = reinterpret_cast<const float3&>(face->edge->vertex->position);
 		float3 max_point = min_point;
 		mesh::edge* edge = face->edge;
 		do
 		{
 			const auto& position = edge->vertex->position;
 			for (int i = 0; i < 3; ++i)
 			{
 				min_point[i] = std::min<float>(min_point[i], position[i]);
 				max_point[i] = std::max<float>(max_point[i], position[i]);
 			}

 			edge = edge->next;
 		}
 		while (edge != face->edge);

 		// 1. Find max depth node of aabb min
 		// 2. Find max depth node of aabb max
 		// 3. Find common ancestor of the two nodes--that's the containing node.
 		octree32::node_type min_node = find_node(min_point);
 		octree32::node_type max_node = find_node(max_point);
 		octree32::node_type containing_node = octree32::common_ancestor(min_node, max_node);

 		// Insert containing node into octree
 		octree.insert(containing_node);

 		// Add face to face map
 		face_map[containing_node].push_back(face);
 	}
 }

 std::optional<mesh_accelerator::ray_query_result> mesh_accelerator::query_nearest(const ray<float>& ray) const
 {
 	ray_query_result result;
 	result.t = std::numeric_limits<float>::infinity();
 	result.face = nullptr;

 	query_nearest_recursive(result.t, result.face, octree.root, ray);

 	if (result.face)
 		return std::optional{result};
 	return std::nullopt;
 }

 void mesh_accelerator::query_nearest_recursive(float& nearest_t, ::mesh::face*& nearest_face, octree32::node_type node, const ray<float>& ray) const
 {
 	// Get node bounds
 	const aabb<float> node_bounds = get_node_bounds(node);

 	// Test for intersection with node bounds
 	auto aabb_intersection = ray_aabb_intersection(ray, node_bounds);

 	// If ray passed through this node
 	if (std::get<0>(aabb_intersection))
 	{
 		// Test all triangles in the node
 		if (auto it = face_map.find(node); it != face_map.end())
 		{
 			const std::list<mesh::face*>& faces = it->second;

 			//std::cout << std::bitset<32>(node) << " has " << faces.size() << " faces\n";

 			for (mesh::face* face: faces)
 			{
 				// Get triangle coordinates
 				const float3& a = reinterpret_cast<const float3&>(face->edge->vertex->position);
 				const float3& b = reinterpret_cast<const float3&>(face->edge->next->vertex->position);
 				const float3& c = reinterpret_cast<const float3&>(face->edge->previous->vertex->position);

 				// Test for intersection with triangle
 				auto triangle_intersection = ray_triangle_intersection(ray, a, b, c);
 				if (std::get<0>(triangle_intersection))
 				{
 					float t = std::get<1>(triangle_intersection);
 					if (t < nearest_t)
 					{
 						nearest_t = t;
 						nearest_face = face;
 					}
 				}
 			}
 		}

 		// Test all child nodes
 		if (!octree.is_leaf(node))
 		{
 			for (int i = 0; i < 8; ++i)
 				query_nearest_recursive(nearest_t, nearest_face, octree.child(node, i), ray);
 		}
 	}
 }

 aabb<float> mesh_accelerator::get_node_bounds(octree32::node_type node) const
 {
 	// Decode Morton location of node
 	auto [x, y, z] = morton::decode_3d(octree32::location(node));
 	float3 node_location = float3{static_cast<float>(x), static_cast<float>(y), static_cast<float>(z)};

 	// Get node dimensions at node depth
 	const float3& dimensions = node_dimensions[octree32::depth(node)];

 	// Calculate AABB
 	float3 min_point = (node_location * dimensions) - center_offset;
 	return aabb<float>{min_point, min_point + dimensions};
 }

 octree32::node_type mesh_accelerator::find_node(const float3& point) const
 {
 	// Transform point to octree space
 	float3 transformed_point = (point + center_offset);

 	// Account for floating-point tolerance
 	const float epsilon = 0.00001f;
 	transformed_point.x = std::max<float>(0.0f, std::min<float>(node_dimensions[0].x - epsilon, transformed_point.x));
 	transformed_point.y = std::max<float>(0.0f, std::min<float>(node_dimensions[0].y - epsilon, transformed_point.y));
 	transformed_point.z = std::max<float>(0.0f, std::min<float>(node_dimensions[0].z - epsilon, transformed_point.z));

 	// Transform point to max-depth node space
 	transformed_point = transformed_point / node_dimensions[octree32::max_depth];

 	// Encode transformed point as a Morton location code
 	std::uint32_t location = morton::encode_3d(
 		static_cast<std::uint32_t>(transformed_point.x),
 		static_cast<std::uint32_t>(transformed_point.y),
 		static_cast<std::uint32_t>(transformed_point.z));
 	
 	/// Return max depth node at the determined location
 	return octree32::node(octree32::max_depth, location);
 }

--- a/src/antkeeper/geometry/mesh-accelerator.hpp
+++ b/src/antkeeper/geometry/mesh-accelerator.hpp
@ -0,0 +1,76 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MESH_ACCELERATOR_HPP
 #define ANTKEEPER_MESH_ACCELERATOR_HPP

 #include "mesh.hpp"
 #include "octree.hpp"
 #include "geometry/aabb.hpp"
 #include "intersection.hpp"
 #include <list>
 #include <unordered_map>
 #include <optional>
 #include <vmq/vmq.hpp>
 using namespace vmq::types;
 using namespace vmq::operators;

 /**
 * Acceleration structure for querying mesh geometry.
 */
 class mesh_accelerator
 {
 public:
 	struct ray_query_result
 	{
 		float t;
 		::mesh::face* face;
 	};

 	mesh_accelerator();

 	/**
 	 * Builds the acceleration structure.
 	 */
 	void build(const mesh& mesh);

 	/**
 	 * Finds the first intersection between a ray and a triangle in the mesh.
 	 *
 	 * @param ray Ray to test for intersection.
 	 * @return Ray query result on intersection, and `std::nullopt` if no intersection occurreda.
 	 */
 	std::optional<ray_query_result> query_nearest(const ray<float>& ray) const;
 	
 private:
 	aabb<float> get_node_bounds(octree32::node_type node) const;

 	void query_nearest_recursive(float& nearest_t, ::mesh::face*& nearest_face, octree32::node_type node, const ray<float>& ray) const;

 	/// Returns the max-depth node in which the point is located
 	octree32::node_type find_node(const float3& point) const;

 	octree32 octree;
 	float3 node_dimensions[octree32::max_depth + 1];
 	float3 center_offset;
 	std::unordered_map<octree32::node_type, std::list<mesh::face*>> face_map;
 };

 #endif // ANTKEEPER_MESH_ACCELERATOR_HPP

--- a/src/antkeeper/geometry/mesh-functions.cpp
+++ b/src/antkeeper/geometry/mesh-functions.cpp
@ -0,0 +1,122 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "mesh-functions.hpp"
 #include <vmq/vmq.hpp>
 #include <stdexcept>
 #include <unordered_map>
 #include <map>
 #include <iostream>

 using namespace vmq::operators;

 struct edge_hasher
 {
 	std::size_t operator()(const std::array<std::size_t, 2>& v) const noexcept
 	{
 		std::size_t hash = std::hash<std::size_t>()(v[0]);
 		return hash ^ (std::hash<std::size_t>()(v[1]) + 0x9e3779b9 + (hash << 6) + (hash >> 2));
 	}
 };

 void create_triangle_mesh(mesh& mesh, const std::vector<float3>& vertices, const std::vector<std::array<std::uint_fast32_t, 3>>& triangles)
 {
 	for (const auto& vertex: vertices)
 		mesh.add_vertex(vertex);

 	std::unordered_map<std::array<std::size_t, 2>, ::mesh::edge*, edge_hasher> edge_map;
 	const std::vector<mesh::vertex*>& mesh_vertices = mesh.get_vertices();
 	std::vector<::mesh::edge*> loop(3);

 	for (const auto& triangle: triangles)
 	{
 		::mesh::vertex* triangle_vertices[3] =
 		{
 			mesh_vertices[triangle[0]],
 			mesh_vertices[triangle[1]],
 			mesh_vertices[triangle[2]]
 		};

 		for (int j = 0; j < 3; ++j)
 		{
 			::mesh::vertex* start = triangle_vertices[j];
 			::mesh::vertex* end = triangle_vertices[(j + 1) % 3];

 			if (auto it = edge_map.find({start->index, end->index}); it != edge_map.end())
 			{
 				/*
 				if (it->second->face)
 					std::cout << "THIS EDGE ALREADY HAS A FACE!\n" << std::endl;
 				*/
 				loop[j] = it->second;
 			}
 			else
 			{
 				loop[j] = mesh.add_edge(start, end);
 				edge_map[{start->index, end->index}] = loop[j];
 				edge_map[{end->index, start->index}] = loop[j]->symmetric;
 			}

 		}

 		mesh.add_face(loop);
 	}
 }

 void calculate_face_normals(float* normals, const mesh& mesh)
 {
 	const std::vector<mesh::face*>& faces = mesh.get_faces();

 	for (std::size_t i = 0; i < faces.size(); ++i)
 	{
 		const mesh::face& face = *(faces[i]);
 		float3& normal = reinterpret_cast<float3&>(normals[i * 3]);

 		const float3& a = reinterpret_cast<const float3&>(face.edge->vertex->position);
 		const float3& b = reinterpret_cast<const float3&>(face.edge->next->vertex->position);
 		const float3& c = reinterpret_cast<const float3&>(face.edge->previous->vertex->position);

 		normal = vmq::normalize(vmq::cross(b - a, c - a));
 	}
 }

 aabb<float> calculate_bounds(const mesh& mesh)
 {
 	float3 bounds_min;
 	float3 bounds_max;
 	for (int i = 0; i < 3; ++i)
 	{
 		bounds_min[i] = std::numeric_limits<float>::infinity();
 		bounds_max[i] = -std::numeric_limits<float>::infinity();
 	}

 	for (const mesh::vertex* vertex: mesh.get_vertices())
 	{
 		const auto& position = vertex->position;
 		for (int i = 0; i < 3; ++i)
 		{
 			bounds_min[i] = std::min<float>(bounds_min[i], position[i]);
 			bounds_max[i] = std::max<float>(bounds_max[i], position[i]);
 		}
 	}

 	return aabb<float>{bounds_min, bounds_max};
 }


--- a/src/antkeeper/geometry/mesh-functions.hpp
+++ b/src/antkeeper/geometry/mesh-functions.hpp
@ -0,0 +1,58 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MESH_FUNCTIONS_HPP
 #define ANTKEEPER_MESH_FUNCTIONS_HPP

 #include "mesh.hpp"
 #include <vmq/vmq.hpp>
 #include <array>
 #include <vector>
 #include "geometry/aabb.hpp"

 using namespace vmq::types;

 /**
 * Creates a triangle mesh from a list of vertices and indices.
 *
 * @param[out] mesh Mesh to which vertices, edges, and faces will be added.
 * @param vertices Vertex positions
 * @param triangles Triangle indices
 * @return Newly created triangle mesh.
 */
 void create_triangle_mesh(mesh& mesh, const std::vector<float3>& vertices, const std::vector<std::array<std::uint_fast32_t, 3>>& triangles);

 /**
 * Calculates normals for each face.
 *
 * @param[out] Array in which normals will be stored. Must be able to hold `3 * face count` floats.
 * @param layer Face layer in which the normals will be stored. Must have three components.
 */
 void calculate_face_normals(float* normals, const mesh& mesh);

 void calculate_vertex_normals(float* normals, const mesh& mesh);

 /**
 * Calculates the AABB bounds of a mesh.
 */
 aabb<float> calculate_bounds(const mesh& mesh);


 #endif // ANTKEEPER_MESH_FUNCTIONS_HPP

--- a/src/antkeeper/geometry/mesh.cpp
+++ b/src/antkeeper/geometry/mesh.cpp
@ -0,0 +1,332 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "mesh.hpp"
 #include <stdexcept>

 mesh::~mesh()
 {
 	// Deallocate vertices
 	for (mesh::vertex* vertex: vertices)
 	{		
 		delete vertex;
 	}

 	// Deallocate edges
 	for (mesh::edge* edge: edges)
 	{
 		delete edge->symmetric;
 		delete edge;
 	}

 	// Deallocate faces
 	for (mesh::face* face: faces)
 	{
 		delete face;
 	}
 }

 mesh::vertex* mesh::add_vertex(const std::array<float, 3>& position)
 {
 	mesh::vertex* vertex = new mesh::vertex();
 	vertex->edge = nullptr;
 	vertex->position = position;
 	vertex->index = vertices.size();
 	vertices.push_back(vertex);

 	return vertex;
 }

 mesh::edge* mesh::add_edge(mesh::vertex* a, mesh::vertex* b)
 {
 	mesh::edge* ab = new mesh::edge();
 	mesh::edge* ba = new mesh::edge();

 	ab->vertex = a;
 	ab->face = nullptr;
 	ab->previous = ba;
 	ab->next = ba;
 	ab->symmetric = ba;
 	ab->index = edges.size();

 	ba->vertex = b;
 	ba->face = nullptr;
 	ba->previous = ab;
 	ba->next = ab;
 	ba->symmetric = ab;
 	ba->index = edges.size();

 	if (!a->edge)
 	{
 		a->edge = ab;
 	}
 	else
 	{
 		mesh::edge* a_in = find_free_incident(a);
 		mesh::edge* a_out = a_in->next;
 		a_in->next = ab;
 		ab->previous = a_in;
 		ba->next = a_out;
 		a_out->previous = ba;
 	}

 	if (!b->edge)
 	{
 		b->edge = ba;
 	}
 	else
 	{
 		mesh::edge* b_in = find_free_incident(b);
 		mesh::edge* b_out = b_in->next;
 		b_in->next = ba;
 		ba->previous = b_in;
 		ab->next = b_out;
 		b_out->previous = ab;
 	}

 	// Add edge
 	edges.push_back(ab);

 	return ab;
 }

 mesh::face* mesh::add_face(const loop& loop)
 {
 	if (loop.empty())
 	{
 		throw std::runtime_error("Empty edge loop");
 	}

 	// Validate edge loop
 	for (std::size_t i = 0; i < loop.size(); ++i)
 	{
 		mesh::edge* current = loop[i];
 		mesh::edge* next = loop[(i + 1) % loop.size()];

 		if (current->symmetric->vertex != next->vertex)
 		{
 			// Disconnected edge loop
 			throw std::runtime_error("Disconnected edge loop");
 		}

 		if (current->face)
 		{
 			// This edge already has a face
 			throw std::runtime_error("Non-manifold mesh 1");
 		}
 	}

 	// Make edges adjacent
 	for (std::size_t i = 0; i < loop.size(); ++i)
 	{
 		if (!make_adjacent(loop[i], loop[(i + 1) % loop.size()]))
 		{
 			throw std::runtime_error("Non-manifold mesh 2");
 		}
 	}

 	// Create face
 	mesh::face* face = new mesh::face();
 	face->edge = loop[0];
 	face->index = faces.size();

 	// Add face
 	faces.push_back(face);

 	// Connect edges to the face
 	for (mesh::edge* edge: loop)
 	{
 		edge->face = face;
 	}

 	return face;
 }

 void mesh::remove_face(mesh::face* face)
 {
 	// Nullify pointers to this face
 	mesh::edge* edge = face->edge;
 	do
 	{
 		edge->face = nullptr;
 		edge = edge->next;
 	}
 	while (edge != face->edge);

 	// Adjust indices of faces after this face
 	for (std::size_t i = face->index + 1; i < faces.size(); ++i)
 	{
 		--faces[i]->index;
 	}

 	// Remove face from the faces vector
 	faces.erase(faces.begin() + face->index);

 	// Deallocate face
 	delete face;
 }

 void mesh::remove_edge(mesh::edge* edge)
 {
 	mesh::edge* ab = edge;
 	mesh::edge* ba = edge->symmetric;
 	mesh::vertex* a = ab->vertex;
 	mesh::edge* a_in = ab->previous;
 	mesh::edge* a_out = ba->next;
 	mesh::vertex* b = ba->vertex;
 	mesh::edge* b_in = ba->previous;
 	mesh::edge* b_out = ab->next;

 	// Remove dependent faces
 	if (ab->face)
 		remove_face(ab->face);
 	if (ba->face)
 		remove_face(ba->face);

 	// Re-link edges
 	if (a->edge == ab)
 		a->edge = (a_out == ab) ? nullptr : a_out;
 	if (b->edge == ba)
 		b->edge = (b_out == ba) ? nullptr : b_out;
 	a_in->next = a_out;
 	a_out->previous = a_in;
 	b_in->next = b_out;
 	b_out->previous = b_in;

 	// Adjust indices of edges after this edge
 	for (std::size_t i = edge->index + 1; i < edges.size(); ++i)
 	{
 		--edges[i]->index;
 		--edges[i]->symmetric->index;
 	}

 	// Remove edge from the edges vector
 	edges.erase(edges.begin() + edge->index);

 	// Deallocate edge
 	delete edge->symmetric;
 	delete edge;
 }

 void mesh::remove_vertex(mesh::vertex* vertex)
 {
 	// Remove connected edges
 	if (vertex->edge)
 	{
 		mesh::edge* current = nullptr;
 		mesh::edge* next = vertex->edge;

 		do
 		{
 			current = next;

 			next = next->symmetric->next;
 			if (next == current)
 			{
 				next = next->symmetric->next;
 			}

 			remove_edge(current);
 		}
 		while (current != next);
 	}

 	// Adjust indices of vertices after this vertex
 	for (std::size_t i = vertex->index + 1; i < vertices.size(); ++i)
 	{
 		--vertices[i]->index;
 	}

 	// Remove vertex from the vertices vector
 	vertices.erase(vertices.begin() + vertex->index);

 	// Deallocate vertex
 	delete vertex;
 }

 mesh::edge* mesh::find_free_incident(mesh::vertex* vertex) const
 {
 	mesh::edge* begin = vertex->edge->symmetric;
 	mesh::edge* current = begin;

 	do
 	{
 		if (!current->face)
 		{
 			return current;
 		}

 		current = current->next->symmetric;
 	}
 	while (current != begin);

 	return nullptr;
 }

 mesh::edge* mesh::find_free_incident(mesh::edge* start_edge, mesh::edge* end_edge) const
 {
 	if (start_edge == end_edge)
 	{
 		return nullptr;
 	}

 	mesh::edge* current = start_edge;
 	do
 	{
 		if (!current->face)
 		{
 			return current;
 		}

 		current = current->next->symmetric;
 	}
 	while (current != end_edge);

 	return nullptr;
 }

 bool mesh::make_adjacent(mesh::edge* in, mesh::edge* out)
 {
 	if (in->next == out)
 	{
 		return true;
 	}

 	mesh::edge* b = in->next;
 	mesh::edge* d = out->previous;
 	mesh::edge* g = find_free_incident(out->symmetric, in);
 	if (!g)
 	{
 		return false;
 	}

 	mesh::edge* h = g->next;

 	in->next = out;
 	out->previous = in;

 	g->next = b;
 	b->previous = g;

 	d->next = h;
 	h->previous = d;

 	return true;
 }

--- a/src/antkeeper/geometry/mesh.hpp
+++ b/src/antkeeper/geometry/mesh.hpp
@ -0,0 +1,181 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MESH_HPP
 #define ANTKEEPER_MESH_HPP

 #include <array>
 #include <vector>

 /**
 * Half-edge mesh.
 *
 * @see http://kaba.hilvi.org/homepage/blog/halfedge/halfedge.htm
 */
 class mesh
 {
 public:
 	struct vertex;
 	struct edge;
 	struct face;
 	typedef std::vector<edge*> loop;

 	/**
 	 * Creates a mesh.
 	 */
 	mesh() = default;
 	
 	/**
 	 * Destroys a mesh.
 	 */
 	~mesh();

 	/**
 	 * Adds a vertex to the mesh. This vertex initially has a null edge.
 	 *
 	 * @param position Position of the vertex.
 	 * @return Pointer to the added vertex.
 	 */
 	mesh::vertex* add_vertex(const std::array<float, 3>& position);

 	/**
 	 * Adds an edge to the mesh.
 	 *
 	 * @param a The vertex from which the edge originates.
 	 * @param b The vertex at which the edge ends.
 	 * @return Pointer to the added edge.
 	 */
 	mesh::edge* add_edge(mesh::vertex* a, mesh::vertex* b);

 	/**
 	 * Adds a face to the mesh.
 	 *
 	 * @param loop List of edges which form the face.
 	 * @return Pointer to the added face.
 	 */
 	mesh::face* add_face(const loop& loop);

 	/**
 	 * Removes a face from the mesh.
 	 *
 	 * @param face Face to be removed. This face will be deallocated after removal.
 	 */
 	void remove_face(mesh::face* face);

 	/**
 	 * Removes an edge and all dependent faces from the mesh.
 	 *
 	 * @param edge Edge to be removed. This edge will be deallocated after removal.
 	 */
 	void remove_edge(mesh::edge* edge);

 	/**
 	 * Removes a vertex, all dependent edges, and all dependent faces from the mesh.
 	 *
 	 * @param vertex Vertex to be removed. This vertex will be deallocated after removal.
 	 */
 	void remove_vertex(mesh::vertex* vertex);
 	
 	/// Returns the mesh vertices
 	const std::vector<mesh::vertex*>& get_vertices() const;
 	
 	/// Returns the mesh edges
 	const std::vector<mesh::edge*>& get_edges() const;
 	
 	/// Returns the mesh faces
 	const std::vector<mesh::face*>& get_faces() const;

 	/**
 	 * Half-edge vertex which contains a pointer to its parent edge, a position vector, and an index.
 	 */
 	struct vertex
 	{
 		/// Pointer to the edge to which this vertex belongs
 		mesh::edge* edge;
 		
 		/// Vertex position
 		std::array<float, 3> position;
 		
 		/// Index of this vertex
 		std::size_t index;
 	};
 	
 	/**
 	 * Half-edge edge which contains pointers to its starting vertex, parent face, and related edges.
 	 */
 	struct edge
 	{
 		/// Pointer to the vertex at which the edge starts
 		mesh::vertex* vertex;     
 		
 		/// Pointer to the face on the left of this edge
 		mesh::face* face;
 		
 		/// Pointer to the previous edge in the parent face
 		mesh::edge* previous;
 		
 		/// Pointer to the next edge in the parent face
 		mesh::edge* next;
 		
 		/// Pointer to the symmetric edge
 		mesh::edge* symmetric;
 		
 		/// Index of this edge
 		std::size_t index;
 	};
 	
 	/**
 	 * Half-edge face which contains a pointer to its first edge and its normal vector.
 	 */
 	struct face
 	{
 		/// Pointer to the first edge in this face
 		mesh::edge* edge;
 		
 		/// Index of this face
 		std::size_t index;
 	};

 private:
 	mesh::edge* find_free_incident(mesh::vertex* vertex) const;
 	mesh::edge* find_free_incident(mesh::edge* start_edge, mesh::edge* end_edge) const;
 	bool make_adjacent(mesh::edge* in_edge, mesh::edge* out_edge);

 	std::vector<mesh::vertex*> vertices;
 	std::vector<mesh::edge*> edges;
 	std::vector<mesh::face*> faces;
 };

 inline const std::vector<mesh::vertex*>& mesh::get_vertices() const
 {
 	return vertices;
 }

 inline const std::vector<mesh::edge*>& mesh::get_edges() const
 {
 	return edges;
 }

 inline const std::vector<mesh::face*>& mesh::get_faces() const
 {
 	return faces;
 }

 #endif // ANTKEEPER_MESH_HPP

--- a/src/antkeeper/geometry/plane.hpp
+++ b/src/antkeeper/geometry/plane.hpp
@ -0,0 +1,112 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_PLANE_HPP
 #define ANTKEEPER_PLANE_HPP

 #include <vmq/vmq.hpp>

 using vmq::vector;
 using namespace vmq::operators;

 template <class T>
 struct plane
 {
 	vector<T, 3> normal;
 	T distance;
 	
 	/**
 	 * Creates a plane given a normal vector and distance.
 	 */
 	plane(const vector<T, 3>& normal, T distance);
 	
 	/**
 	 * Creates a plane given a normal vector and offset vector.
 	 */
 	plane(const vector<T, 3>& normal, const vector<T, 3>& offset);
 	
 	/**
 	 * Creates a plane given three points.
 	 */
 	plane(const vector<T, 3>& a, const vector<T, 3>& b, const vector<T, 3>& c);
 	
 	/**
 	 * Creates a plane given its coefficients.
 	 *
 	 * @param coefficients Vector containing the plane coefficients, A, B, C and D, as x, y, z, and w, respectively.
 	 */
 	plane(const vector<T, 4>& coefficients);
 	
 	/// Creates an uninitialized plane.
 	plane() = default;
 };

 template <class T>
 inline plane<T>::plane(const vector<T, 3>& normal, T distance):
 	normal(normal),
 	distance(distance)
 {}

 template <class T>
 plane<T>::plane(const vector<T, 3>& normal, const vector<T, 3>& offset):
 	normal(normal),
 	distance(-vmq::dot(normal, offset))
 {}

 template <class T>
 plane<T>::plane(const vector<T, 3>& a, const vector<T, 3>& b, const vector<T, 3>& c)
 {
 	normal = vmq::normalize(vmq::cross(c - b, a - b));
 	distance = -(vmq::dot(normal, b));
 }

 template <class T>
 plane<T>::plane(const vector<T, 4>& coefficients)
 {
 	const vector<T, 3> abc = vmq::resize<3>(coefficients);
 	const float inverse_length = T(1) / vmq::length(abc);
 	
 	normal = abc * inverse_length;
 	distance = coefficients[3] * inverse_length;
 }

 /**
 * Calculates the signed distance between a plane and a vector.
 *
 * @param p Plane.
 * @param v Vector.
 * @return Signed distance between the plane and a vector.
 */
 template <class T>
 inline T signed_distance(const plane<T>& p, const vector<T, 3>& v)
 {
 	return p.distance + vmq::dot(p.normal, v);
 }

 /**
 * Calculates the point of intersection between three planes.
 */
 template <class T>
 vector<T, 3> intersection(const plane<T>& p0, const plane<T>& p1, const plane<T>& p2)
 {
 	return -(p0.distance * vmq::cross(p1.normal, p2.normal) + p1.distance * vmq::cross(p2.normal, p0.normal) + p2.distance * vmq::cross(p0.normal, p1.normal)) / vmq::dot(p0.normal, vmq::cross(p1.normal, p2.normal));
 }

 #endif // ANTKEEPER_PLANE_HPP

--- a/src/antkeeper/geometry/ray.hpp
+++ b/src/antkeeper/geometry/ray.hpp
@ -0,0 +1,44 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_RAY_HPP
 #define ANTKEEPER_RAY_HPP

 #include <vmq/vmq.hpp>

 using vmq::vector;
 using namespace vmq::operators;

 template <class T>
 struct ray
 {
 	vector<T, 3> origin;
 	vector<T, 3> direction;

 	vector<T, 3> extrapolate(T distance) const;
 };

 template <class T>
 inline vector<T, 3> ray<T>::extrapolate(T distance) const
 {
 	return origin + direction * distance;
 }

 #endif // ANTKEEPER_RAY_HPP

--- a/src/antkeeper/geometry/sphere.hpp
+++ b/src/antkeeper/geometry/sphere.hpp
@ -0,0 +1,112 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_SPHERE_HPP
 #define ANTKEEPER_SPHERE_HPP

 #include "bounding-volume.hpp"
 #include "aabb.hpp"
 #include <vmq/vmq.hpp>
 #include <algorithm>

 using vmq::vector;
 using namespace vmq::operators;

 template <class T>
 struct sphere: public bounding_volume<T>
 {
 	vector<T, 3> center;
 	T radius;
 	
 	sphere(const vector<T, 3>& center, T radius);
 	sphere();
 	
 	virtual bounding_volume_type get_bounding_volume_type() const;
 	virtual bool intersects(const sphere<T>& sphere) const;
 	virtual bool intersects(const aabb<T>& aabb) const;
 	virtual bool contains(const sphere<T>& sphere) const;
 	virtual bool contains(const aabb<T>& aabb) const;
 	virtual bool contains(const vector<T, 3>& point) const;
 };

 template <class T>
 sphere<T>::sphere(const vector<T, 3>& center, T radius):
 	center(center),
 	radius(radius)
 {}

 template <class T>
 sphere<T>::sphere()
 {}

 template <class T>
 inline bounding_volume_type sphere<T>::get_bounding_volume_type() const
 {
 	return bounding_volume_type::sphere;
 }

 template <class T>
 bool sphere<T>::intersects(const sphere<T>& sphere) const
 {
 	vector<T, 3> d = center - sphere.center;
 	float r = radius + sphere.radius;
 	return (vmq::dot(d, d) <= r * r);
 }

 template <class T>
 bool sphere<T>::intersects(const aabb<T>& aabb) const
 {
 	return aabb.intersects(*this);
 }

 template <class T>
 bool sphere<T>::contains(const sphere<T>& sphere) const
 {
 	float containment_radius = radius - sphere.radius;
 	if (containment_radius < T(0))
 		return false;
 	
 	vector<T, 3> d = center - sphere.center;
 	return (vmq::dot(d, d) <= containment_radius * containment_radius);
 }

 template <class T>
 bool sphere<T>::contains(const aabb<T>& aabb) const
 {
 	T distance = T(0);
 	
 	vector<T, 3> a = center - aabb.min_point;
 	vector<T, 3> b = center - aabb.max_point;
 	
 	distance += std::max(a.x * a.x, b.x * b.x);
 	distance += std::max(a.y * a.y, b.y * b.y);
 	distance += std::max(a.z * a.z, b.z * b.z);
 	
 	return (distance <= radius * radius);
 }

 template <class T>
 bool sphere<T>::contains(const vector<T, 3>& point) const
 {
 	vector<T, 3> d = center - point;
 	return (vmq::dot(d, d) <= radius * radius);
 }

 #endif // ANTKEEPER_SPHERE_HPP

--- a/src/antkeeper/geometry/view-frustum.hpp
+++ b/src/antkeeper/geometry/view-frustum.hpp
@ -0,0 +1,181 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_VIEW_FRUSTUM_HPP
 #define ANTKEEPER_VIEW_FRUSTUM_HPP

 #include "convex-hull.hpp"
 #include <array>
 #include <vmq/vmq.hpp>

 using vmq::vector;
 using vmq::matrix;
 using namespace vmq::operators;

 template <class T>
 class view_frustum
 {
 public:
 	/**
 	 * Creates a view frustum from a view-projection matrix.
 	 *
 	 * @param view_projection View-projection matrix.
 	 */
 	view_frustum(const matrix<T, 4, 4>& view_projection);
 	
 	/// Creates an uninitialized view frustum.
 	view_frustum();
 	
 	/**
 	 * Recalculates the view frustum from a view-projection matrix.
 	 *
 	 * @param view_projection View-projection matrix.
 	 */
 	void set_matrix(const matrix<T, 4, 4>& view_projection);
 	
 	/// Returns a convex hull which describes the bounds of the view frustum.
 	const convex_hull<T>& get_bounds() const;
 	
 	/// Returns the left clipping plane.
 	const plane<T>& get_left() const;
 	
 	/// Returns the right clipping plane.
 	const plane<T>& get_right() const;
 	
 	/// Returns the bottom clipping plane.
 	const plane<T>& get_bottom() const;
 	
 	/// Returns the top clipping plane.
 	const plane<T>& get_top() const;
 	
 	/// Returns the near clipping plane.
 	const plane<T>& get_near() const;
 	
 	/// Returns the far clipping plane.
 	const plane<T>& get_far() const;
 	
 	/**
 	 * Returns an array containing the corners of the view frustum bounds.
 	 *
 	 * @return Array containing the corners of the view frustum bounds. Corners are stored in the following order: NTL, NTR, NBL, NBR, FTL, FTR, FBL, FBR; where N is near, F is far, T is top, B is bottom, L is left, and R is right, therefore NTL refers to the corner shared between the near, top, and left clipping planes.
 	 */
 	const std::array<vector<T, 3>, 8>& get_corners() const;

 private:
 	void recalculate_planes(const matrix<T, 4, 4>& view_projection);
 	void recalculate_corners();
 	
 	convex_hull<T> bounds;
 	std::array<vector<T, 3>, 8> corners;
 };

 template <class T>
 view_frustum<T>::view_frustum(const matrix<T, 4, 4>& view_projection):
 	bounds(6)
 {
 	set_matrix(view_projection);
 }

 template <class T>
 view_frustum<T>::view_frustum():
 	view_frustum(vmq::identity4x4<T>)
 {}

 template <class T>
 void view_frustum<T>::set_matrix(const matrix<T, 4, 4>& view_projection)
 {
 	recalculate_planes(view_projection);
 	recalculate_corners();
 }

 template <class T>
 inline const convex_hull<T>& view_frustum<T>::get_bounds() const
 {
 	return bounds;
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_left() const
 {
 	return bounds.planes[0];
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_right() const
 {
 	return bounds.planes[1];
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_bottom() const
 {
 	return bounds.planes[2];
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_top() const
 {
 	return bounds.planes[3];
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_near() const
 {
 	return bounds.planes[4];
 }

 template <class T>
 inline const plane<T>& view_frustum<T>::get_far() const
 {
 	return bounds.planes[5];
 }

 template <class T>
 inline const std::array<vector<T, 3>, 8>& view_frustum<T>::get_corners() const
 {
 	return corners;
 }

 template <class T>
 void view_frustum<T>::recalculate_planes(const matrix<T, 4, 4>& view_projection)
 {
 	matrix<T, 4, 4> transpose = vmq::transpose(view_projection);
 	bounds.planes[0] = plane<T>(transpose[3] + transpose[0]);
 	bounds.planes[1] = plane<T>(transpose[3] - transpose[0]);
 	bounds.planes[2] = plane<T>(transpose[3] + transpose[1]);
 	bounds.planes[3] = plane<T>(transpose[3] - transpose[1]);
 	bounds.planes[4] = plane<T>(transpose[3] + transpose[2]);
 	bounds.planes[5] = plane<T>(transpose[3] - transpose[2]);
 }

 template <class T>
 void view_frustum<T>::recalculate_corners()
 {
 	corners[0] = intersection(get_near(), get_top(), get_left());
 	corners[1] = intersection(get_near(), get_top(), get_right());
 	corners[2] = intersection(get_near(), get_bottom(), get_left());
 	corners[3] = intersection(get_near(), get_bottom(), get_right());
 	corners[4] = intersection(get_far(), get_top(), get_left());
 	corners[5] = intersection(get_far(), get_top(), get_right());
 	corners[6] = intersection(get_far(), get_bottom(), get_left());
 	corners[7] = intersection(get_far(), get_bottom(), get_right());
 }

 #endif // ANTKEEPER_VIEW_FRUSTUM_HPP

--- a/src/antkeeper/input/control-set.cpp
+++ b/src/antkeeper/input/control-set.cpp
@ -0,0 +1,53 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "control-set.hpp"
 #include "control.hpp"

 void control_set::add_control(control* control)
 {
 	controls.push_back(control);
 }

 void control_set::remove_control(control* control)
 {
 	controls.remove(control);
 }

 void control_set::remove_controls()
 {
 	controls.clear();
 }

 void control_set::update()
 {
 	for (control* control: controls)
 	{
 		control->update();
 	}
 }

 void control_set::set_callbacks_enabled(bool enabled)
 {
 	for (control* control: controls)
 	{
 		control->set_callbacks_enabled(enabled);
 	}
 }

--- a/src/antkeeper/input/control-set.hpp
+++ b/src/antkeeper/input/control-set.hpp
@ -0,0 +1,81 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CONTROL_SET_HPP
 #define ANTKEEPER_CONTROL_SET_HPP

 #include <list>

 class control;

 /**
 * A set of controls which can be managed simultaneously.
 *
 * @ingroup input
 */
 class control_set
 {
 public:
 	/**
 	 * Adds a control to the control set.
 	 *
 	 * @param control Pointer to the control to add.
 	 */
 	void add_control(control* control);

 	/**
 	 * Removes a control from the control set.
 	 *
 	 * @param control Pointer to the control to remove.
 	 */
 	void remove_control(control* control);

 	/**
 	 * Removes all controls from the control set.
 	 */
 	void remove_controls();
 	
 	/**
 	 * Calls control::update() on each control in this control set.
 	 */
 	void update();

 	/**
 	 * Enables or disables callbacks for all controls in the control set.
 	 *
 	 * @param enabled Whether to enable or disable callbacks for all controls in the control set.
 	 */
 	void set_callbacks_enabled(bool enabled);

 	/**
 	 * Returns the list of controls in the control set.
 	 */
 	const std::list<control*>* get_controls() const;
 	
 private:
 	std::list<control*> controls;
 };

 inline const std::list<control*>* control_set::get_controls() const
 {
 	return &controls;
 }

 #endif // ANTKEEPER_CONTROL_SET_HPP

--- a/src/antkeeper/input/control.cpp
+++ b/src/antkeeper/input/control.cpp
@ -0,0 +1,111 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "control.hpp"

 control::control():
 	deadzone(0.0f),
 	current_value(0.0f),
 	previous_value(0.0f),
 	reset(false),
 	activated_callback(nullptr),
 	deactivated_callback(nullptr),
 	value_changed_callback(nullptr),
 	callbacks_enabled(true)
 {}

 control::~control()
 {}

 void control::update()
 {
 	// Perform callbacks, if enabled
 	if (callbacks_enabled)
 	{
 		if (activated_callback)
 		{
 			if (is_active() && !was_active())
 			{
 				activated_callback();
 			}
 		}

 		if (deactivated_callback)
 		{
 			if (!is_active() && was_active())
 			{
 				deactivated_callback();
 			}
 		}

 		if (value_changed_callback)
 		{
 			if (current_value != previous_value)
 			{
 				if (is_active() || was_active())
 				{
 					value_changed_callback(current_value);
 				}
 			}
 		}
 	}

 	// Update previous value
 	previous_value = current_value;

 	// Reset temporary values
 	if (reset)
 	{
 		current_value = 0.0f;
 		reset = false;
 	}
 }

 void control::set_current_value(float value)
 {
 	current_value = value;
 	reset = false;
 }

 void control::set_temporary_value(float value)
 {
 	current_value = value;
 	reset = true;
 }

 void control::set_deadzone(float value)
 {
 	deadzone = value;
 }

 void control::set_activated_callback(std::function<void()> callback)
 {
 	this->activated_callback = callback;
 }

 void control::set_deactivated_callback(std::function<void()> callback)
 {
 	this->deactivated_callback = callback;
 }

 void control::set_value_changed_callback(std::function<void(float)> callback)
 {
 	this->value_changed_callback = callback;
 }

--- a/src/antkeeper/input/control.hpp
+++ b/src/antkeeper/input/control.hpp
@ -0,0 +1,136 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_CONTROL_HPP
 #define ANTKEEPER_CONTROL_HPP

 #include <functional>

 /**
 * A control can be bound to multiple types of input events.
 *
 * @ingroup input
 */
 class control
 {
 public:
 	/// Creates a control.
 	control();

 	/// Destroys a control.
 	virtual ~control();

 	/**
 	 * Performs callbacks then sets the previous value equal to the current value.
 	 */
 	void update();

 	/**
 	 * Sets the current value of the control.
 	 *
 	 * @param value control value.
 	 */
 	void set_current_value(float value);

 	/**
 	 * This works the same as setting the current value, but causes the value to be reset on the next call to update.
 	 */
 	void set_temporary_value(float value);

 	/**
 	 * Sets the deadzone value. If the current value of the control is not greater than the deadzone value, the control will not be considered active.
 	 *
 	 * @param value Deadzone value.
 	 */
 	void set_deadzone(float value);

 	/// Sets the callback for when the control is activated.
 	void set_activated_callback(std::function<void()> callback);

 	/// Sets the callback for when the control is deactivated.
 	void set_deactivated_callback(std::function<void()> callback);

 	/// Sets the callback for when the control value is changed.
 	void set_value_changed_callback(std::function<void(float)> callback);

 	/**
 	 * Enables or disables callbacks.
 	 *
 	 * @param enabled Whether to enable or disable callbacks.
 	 */
 	void set_callbacks_enabled(bool enabled);

 	/// Returns the deadzone value. The default value is 0.0.
 	float get_deadzone() const;

 	/// Returns the current value of the control.
 	float get_current_value() const;

 	/// Returns the previous value of the control.
 	float get_previous_value() const;

 	/// Returns true if the control is currently active.
 	bool is_active() const;

 	/// Returns true if the control was previously active when update() was last called.
 	bool was_active() const;

 private:
 	float deadzone;
 	float current_value;
 	float previous_value;
 	bool reset;
 	std::function<void()> activated_callback;
 	std::function<void()> deactivated_callback;
 	std::function<void(float)> value_changed_callback;
 	bool callbacks_enabled;
 };

 inline void control::set_callbacks_enabled(bool enabled)
 {
 	this->callbacks_enabled = enabled;
 }

 inline float control::get_deadzone() const
 {
 	return deadzone;
 }

 inline float control::get_current_value() const
 {
 	return current_value;
 }

 inline float control::get_previous_value() const
 {
 	return previous_value;
 }

 inline bool control::is_active() const
 {
 	return current_value > deadzone;
 }

 inline bool control::was_active() const
 {
 	return previous_value > deadzone;
 }

 #endif // ANTKEEPER_CONTROL_HPP

--- a/src/antkeeper/input/game-controller.cpp
+++ b/src/antkeeper/input/game-controller.cpp
@ -0,0 +1,70 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "game-controller.hpp"
 #include "input-events.hpp"
 #include "event/event-dispatcher.hpp"
 #include <cmath>

 game_controller::game_controller()
 {}

 void game_controller::press(game_controller_button button)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	game_controller_button_pressed_event event;
 	event.game_controller = this;
 	event.button = button;

 	input_device::event_dispatcher->queue(event);
 }

 void game_controller::release(game_controller_button button)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	game_controller_button_released_event event;
 	event.game_controller = this;
 	event.button = button;

 	input_device::event_dispatcher->queue(event);
 }

 void game_controller::move(game_controller_axis axis, float value)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	game_controller_axis_moved_event event;
 	event.game_controller = this;
 	event.axis = axis;
 	event.value = value;

 	input_device::event_dispatcher->queue(event);
 }

--- a/src/antkeeper/input/game-controller.hpp
+++ b/src/antkeeper/input/game-controller.hpp
@ -0,0 +1,95 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_GAME_CONTROLLER_HPP
 #define ANTKEEPER_GAME_CONTROLLER_HPP

 #include "input-device.hpp"

 enum class game_controller_button
 {
 	a,
 	b,
 	x,
 	y,
 	back,
 	guide,
 	start,
 	left_stick,
 	right_stick,
 	left_shoulder,
 	right_shoulder,
 	dpad_up,
 	dpad_down,
 	dpad_left,
 	dpad_right
 };

 enum class game_controller_axis
 {
 	left_x,
 	left_y,
 	right_x,
 	right_y,
 	trigger_left,
 	trigger_right,
 };

 /**
 * A virtual game controller which can generate game controller-related input events and pass them to an event dispatcher.
 *
 * @ingroup input
 */
 class game_controller: public input_device
 {
 public:
 	/**
 	 * Creates a game controller input device.
 	 */
 	game_controller();

 	/// Destroys a game controller input device.
 	virtual ~game_controller() = default;
 	
 	/**
 	 * Simulates a game controller button press.
 	 *
 	 * @param button Index of the pressed button.
 	 */
 	void press(game_controller_button button);

 	/**
 	 * Simulates a game controller button release.
 	 *
 	 * @param button Index of the released button.
 	 */
 	void release(game_controller_button button);

 	/**
 	 * Simulates a game controller axis movement.
 	 *
 	 * @param axis Index of the moved axis.
 	 * @param negative Whether the movement was negative or positive.
 	 * @param value Normalized degree of movement.
 	 */
 	void move(game_controller_axis axis, float value);
 };

 #endif // ANTKEEPER_GAME_CONTROLLER_HPP

--- a/src/antkeeper/input/input-device.cpp
+++ b/src/antkeeper/input/input-device.cpp
@ -0,0 +1,30 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "input-device.hpp"
 #include "event/event-dispatcher.hpp"

 input_device::input_device():
 	event_dispatcher(nullptr)
 {}

 void input_device::set_event_dispatcher(::event_dispatcher* event_dispatcher)
 {
 	this->event_dispatcher = event_dispatcher;
 }
--- a/src/antkeeper/input/input-device.hpp
+++ b/src/antkeeper/input/input-device.hpp
@ -0,0 +1,55 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_INPUT_DEVICE_HPP
 #define ANTKEEPER_INPUT_DEVICE_HPP

 #include "input-device.hpp"

 class event_dispatcher;

 /**
 * Base class for virtual devices which generate input events.
 */
 class input_device
 {
 public:
 	input_device();
 	virtual ~input_device() = default;

 	void set_event_dispatcher(event_dispatcher* event_dispatcher);
 	const event_dispatcher* get_event_dispatcher() const;
 	event_dispatcher* get_event_dispatcher();

 protected:
 	event_dispatcher* event_dispatcher;
 };

 inline const event_dispatcher* input_device::get_event_dispatcher() const
 {
 	return event_dispatcher;
 }

 inline event_dispatcher* input_device::get_event_dispatcher()
 {
 	return event_dispatcher;
 }

 #endif // ANTKEEPER_INPUT_DEVICE_HPP

--- a/src/antkeeper/input/input-event-router.cpp
+++ b/src/antkeeper/input/input-event-router.cpp
@ -0,0 +1,341 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "input-event-router.hpp"
 #include "control.hpp"
 #include "input-mapping.hpp"
 #include "mouse.hpp"
 #include "event/event-dispatcher.hpp"

 input_event_router::input_event_router():
 	event_dispatcher(nullptr)
 {}

 input_event_router::~input_event_router()
 {
 	remove_mappings();
 	set_event_dispatcher(nullptr);
 }

 void input_event_router::add_mapping(const input_mapping& mapping)
 {
 	control* control = mapping.control;

 	switch (mapping.get_type())
 	{
 		case input_mapping_type::key:
 		{
 			::key_mapping* key_mapping = new ::key_mapping(static_cast<const ::key_mapping&>(mapping));
 			key_mappings.push_back(key_mapping);
 			controls[control].push_back(key_mapping);

 			break;
 		}

 		case input_mapping_type::mouse_motion:
 		{
 			::mouse_motion_mapping* mouse_motion_mapping = new ::mouse_motion_mapping(static_cast<const ::mouse_motion_mapping&>(mapping));
 			mouse_motion_mappings.push_back(mouse_motion_mapping);
 			controls[control].push_back(mouse_motion_mapping);

 			break;
 		}

 		case input_mapping_type::mouse_wheel:
 		{
 			::mouse_wheel_mapping* mouse_wheel_mapping = new ::mouse_wheel_mapping(static_cast<const ::mouse_wheel_mapping&>(mapping));
 			mouse_wheel_mappings.push_back(mouse_wheel_mapping);
 			controls[control].push_back(mouse_wheel_mapping);

 			break;
 		}

 		case input_mapping_type::mouse_button:
 		{
 			::mouse_button_mapping* mouse_button_mapping = new ::mouse_button_mapping(static_cast<const ::mouse_button_mapping&>(mapping));
 			mouse_button_mappings.push_back(mouse_button_mapping);
 			controls[control].push_back(mouse_button_mapping);

 			break;
 		}

 		case input_mapping_type::game_controller_axis:
 		{
 			::game_controller_axis_mapping* game_controller_axis_mapping = new ::game_controller_axis_mapping(static_cast<const ::game_controller_axis_mapping&>(mapping));
 			game_controller_axis_mappings.push_back(game_controller_axis_mapping);
 			controls[control].push_back(game_controller_axis_mapping);

 			break;
 		}

 		case input_mapping_type::game_controller_button:
 		{
 			::game_controller_button_mapping* game_controller_button_mapping = new ::game_controller_button_mapping(static_cast<const ::game_controller_button_mapping&>(mapping));
 			game_controller_button_mappings.push_back(game_controller_button_mapping);
 			controls[control].push_back(game_controller_button_mapping);

 			break;
 		}

 		default:
 			break;
 	}
 }

 void input_event_router::remove_mappings(control* control)
 {
 	auto it = controls.find(control);
 	if (it != controls.end())
 	{
 		for (input_mapping* mapping: it->second)
 		{
 			switch (mapping->get_type())
 			{
 				case input_mapping_type::key:
 					key_mappings.remove(static_cast<key_mapping*>(mapping));
 					break;

 				case input_mapping_type::mouse_motion:
 					mouse_motion_mappings.remove(static_cast<mouse_motion_mapping*>(mapping));
 					break;

 				case input_mapping_type::mouse_wheel:
 					mouse_wheel_mappings.remove(static_cast<mouse_wheel_mapping*>(mapping));
 					break;

 				case input_mapping_type::mouse_button:
 					mouse_button_mappings.remove(static_cast<mouse_button_mapping*>(mapping));
 					break;

 				case input_mapping_type::game_controller_axis:
 					game_controller_axis_mappings.remove(static_cast<game_controller_axis_mapping*>(mapping));
 					break;

 				case input_mapping_type::game_controller_button:
 					game_controller_button_mappings.remove(static_cast<game_controller_button_mapping*>(mapping));
 					break;

 				default:
 					break;
 			}

 			delete mapping;
 		}

 		controls.erase(it);
 	}
 }

 void input_event_router::set_event_dispatcher(::event_dispatcher* event_dispatcher)
 {
 	if (this->event_dispatcher)
 	{
 		this->event_dispatcher->unsubscribe<key_pressed_event>(this);
 		this->event_dispatcher->unsubscribe<key_released_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_moved_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_wheel_scrolled_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_button_pressed_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_button_released_event>(this);
 		this->event_dispatcher->unsubscribe<game_controller_axis_moved_event>(this);
 		this->event_dispatcher->unsubscribe<game_controller_button_pressed_event>(this);
 		this->event_dispatcher->unsubscribe<game_controller_button_released_event>(this);
 	}

 	this->event_dispatcher = event_dispatcher;

 	if (event_dispatcher)
 	{
 		event_dispatcher->subscribe<key_pressed_event>(this);
 		event_dispatcher->subscribe<key_released_event>(this);
 		event_dispatcher->subscribe<mouse_moved_event>(this);
 		event_dispatcher->subscribe<mouse_wheel_scrolled_event>(this);
 		event_dispatcher->subscribe<mouse_button_pressed_event>(this);
 		event_dispatcher->subscribe<mouse_button_released_event>(this);
 		event_dispatcher->subscribe<game_controller_axis_moved_event>(this);
 		event_dispatcher->subscribe<game_controller_button_pressed_event>(this);
 		event_dispatcher->subscribe<game_controller_button_released_event>(this);
 	}
 }

 void input_event_router::remove_mappings()
 {
 	for (auto it = controls.begin(); it != controls.end(); ++it)
 	{
 		for (input_mapping* mapping: it->second)
 		{
 			delete mapping;
 		}
 	}

 	controls.clear();
 	key_mappings.clear();
 	mouse_motion_mappings.clear();
 	mouse_wheel_mappings.clear();
 	mouse_button_mappings.clear();
 	game_controller_axis_mappings.clear();
 	game_controller_button_mappings.clear();
 }

 const std::list<input_mapping*>* input_event_router::get_mappings(control* control) const
 {
 	auto it = controls.find(control);
 	if (it == controls.end())
 	{
 		return nullptr;
 	}

 	return &it->second;
 }

 void input_event_router::handle_event(const key_pressed_event& event)
 {
 	for (const key_mapping* mapping: key_mappings)
 	{
 		if ((!mapping->keyboard || mapping->keyboard == event.keyboard) && mapping->scancode == event.scancode)
 		{
 			mapping->control->set_current_value(1.0f);
 		}
 	}
 }

 void input_event_router::handle_event(const key_released_event& event)
 {
 	for (const key_mapping* mapping: key_mappings)
 	{
 		if ((!mapping->keyboard || mapping->keyboard == event.keyboard) && mapping->scancode == event.scancode)
 		{
 			mapping->control->set_current_value(0.0f);
 		}
 	}
 }

 void input_event_router::handle_event(const mouse_moved_event& event)
 {
 	for (const mouse_motion_mapping* mapping: mouse_motion_mappings)
 	{
 		if (!mapping->mouse || mapping->mouse == event.mouse)
 		{
 			if (mapping->axis == mouse_motion_axis::negative_x && event.dx < 0)
 			{
 				mapping->control->set_temporary_value(-event.dx);
 			}
 			else if (mapping->axis == mouse_motion_axis::positive_x && event.dx > 0)
 			{
 				mapping->control->set_temporary_value(event.dx);
 			}
 			else if (mapping->axis == mouse_motion_axis::negative_y && event.dy < 0)
 			{
 				mapping->control->set_temporary_value(-event.dy);
 			}
 			else if (mapping->axis == mouse_motion_axis::positive_y && event.dy > 0)
 			{
 				mapping->control->set_temporary_value(event.dy);
 			}
 		}
 	}
 }

 void input_event_router::handle_event(const mouse_wheel_scrolled_event& event)
 {
 	for (const mouse_wheel_mapping* mapping: mouse_wheel_mappings)
 	{
 		if (!mapping->mouse || mapping->mouse == event.mouse)
 		{
 			if (mapping->axis == mouse_wheel_axis::negative_x && event.x < 0)
 			{
 				mapping->control->set_temporary_value(-event.x);
 			}
 			else if (mapping->axis == mouse_wheel_axis::positive_x && event.x > 0)
 			{
 				mapping->control->set_temporary_value(event.x);
 			}
 			else if (mapping->axis == mouse_wheel_axis::negative_y && event.y < 0)
 			{
 				mapping->control->set_temporary_value(-event.y);
 			}
 			else if (mapping->axis == mouse_wheel_axis::positive_y && event.y > 0)
 			{
 				mapping->control->set_temporary_value(event.y);
 			}
 		}
 	}
 }

 void input_event_router::handle_event(const mouse_button_pressed_event& event)
 {
 	for (const mouse_button_mapping* mapping: mouse_button_mappings)
 	{
 		if ((!mapping->mouse || mapping->mouse == event.mouse) && mapping->button == event.button)
 		{
 			mapping->control->set_current_value(1.0f);
 		}
 	}
 }

 void input_event_router::handle_event(const mouse_button_released_event& event)
 {
 	for (const mouse_button_mapping* mapping: mouse_button_mappings)
 	{
 		if ((!mapping->mouse || mapping->mouse == event.mouse) && mapping->button == event.button)
 		{
 			mapping->control->set_current_value(0.0f);
 		}
 	}
 }

 void input_event_router::handle_event(const game_controller_axis_moved_event& event)
 {
 	for (const game_controller_axis_mapping* mapping: game_controller_axis_mappings)
 	{
 		if ((!mapping->game_controller || mapping->game_controller == event.game_controller) && mapping->axis == event.axis)
 		{
 			if (mapping->negative && event.value >= 0.0f || !mapping->negative && event.value <= 0.0f)
 			{
 				mapping->control->set_current_value(0.0f);
 			}
 			else
 			{
 				mapping->control->set_current_value(std::abs(event.value));
 			}
 		}
 	}
 }

 void input_event_router::handle_event(const game_controller_button_pressed_event& event)
 {
 	for (const game_controller_button_mapping* mapping: game_controller_button_mappings)
 	{
 		if ((!mapping->game_controller || mapping->game_controller == event.game_controller) && mapping->button == event.button)
 		{
 			mapping->control->set_current_value(1.0f);
 		}
 	}
 }

 void input_event_router::handle_event(const game_controller_button_released_event& event)
 {
 	for (const game_controller_button_mapping* mapping: game_controller_button_mappings)
 	{
 		if ((!mapping->game_controller || mapping->game_controller == event.game_controller) && mapping->button == event.button)
 		{
 			mapping->control->set_current_value(0.0f);
 		}
 	}
 }

--- a/src/antkeeper/input/input-event-router.hpp
+++ b/src/antkeeper/input/input-event-router.hpp
@ -0,0 +1,115 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEER_INPUT_EVENT_ROUTER_HPP
 #define ANTKEEER_INPUT_EVENT_ROUTER_HPP

 #include "input-events.hpp"
 #include "event/event-handler.hpp"
 #include <list>
 #include <map>

 class control;
 class event_dispatcher;
 class input_mapping;
 class key_mapping;
 class mouse_motion_mapping;
 class mouse_wheel_mapping;
 class mouse_button_mapping;
 class game_controller_axis_mapping;
 class game_controller_button_mapping;
 enum class mouse_motion_axis;
 enum class mouse_wheel_axis;

 /**
 * Uses input mappings to route input events to controls.
 */
 class input_event_router:
 	public event_handler<key_pressed_event>,
 	public event_handler<key_released_event>,
 	public event_handler<mouse_moved_event>,
 	public event_handler<mouse_wheel_scrolled_event>,
 	public event_handler<mouse_button_pressed_event>,
 	public event_handler<mouse_button_released_event>,
 	public event_handler<game_controller_axis_moved_event>,
 	public event_handler<game_controller_button_pressed_event>,
 	public event_handler<game_controller_button_released_event>
 {
 public:
 	/**
 	 * Creates an input router and subscribes it to the input events of the specified event dispatcher.
 	 */
 	input_event_router();

 	/**
 	 * Destroys an input router and unsubscribes it from input events.
 	 */
 	~input_event_router();

 	/**
 	 * Adds an input mapping to the router.
 	 *
 	 * @param mapping Input mapping to add.
 	 */
 	void add_mapping(const input_mapping& mapping);


 	/**
 	 * Removes all input mappings from the router that are associated with the specified control.
 	 *
 	 * @param control control with which associated input mappings should be removed.
 	 */
 	void remove_mappings(control* control);

 	/**
 	 * Sets the event dispatcher to which this input event router will subscribe itself.
 	 */
 	void set_event_dispatcher(event_dispatcher* event_dispatcher);

 	/**
 	 * Removes all input mappings from the router.
 	 */
 	void remove_mappings();

 	/// Returns a list of mappings for the specified control, or nullptr if the control is unmapped.
 	const std::list<input_mapping*>* get_mappings(control* control) const;
 	
 private:
 	virtual void handle_event(const key_pressed_event& event);
 	virtual void handle_event(const key_released_event& event);
 	virtual void handle_event(const mouse_moved_event& event);
 	virtual void handle_event(const mouse_wheel_scrolled_event& event);
 	virtual void handle_event(const mouse_button_pressed_event& event);
 	virtual void handle_event(const mouse_button_released_event& event);
 	virtual void handle_event(const game_controller_axis_moved_event& event);
 	virtual void handle_event(const game_controller_button_pressed_event& event);
 	virtual void handle_event(const game_controller_button_released_event& event);

 	event_dispatcher* event_dispatcher;
 	std::map<control*, std::list<input_mapping*>> controls;
 	std::list<key_mapping*> key_mappings;
 	std::list<mouse_motion_mapping*> mouse_motion_mappings;
 	std::list<mouse_wheel_mapping*> mouse_wheel_mappings;
 	std::list<mouse_button_mapping*> mouse_button_mappings;
 	std::list<game_controller_axis_mapping*> game_controller_axis_mappings;
 	std::list<game_controller_button_mapping*> game_controller_button_mappings;
 };

 #endif // ANTKEEER_INPUT_EVENT_ROUTER_HPP

--- a/src/antkeeper/input/input-events.cpp
+++ b/src/antkeeper/input/input-events.cpp
@ -0,0 +1,117 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "input-events.hpp"

 event_base* key_pressed_event::clone() const
 {
 	key_pressed_event* event = new key_pressed_event();
 	event->keyboard = keyboard;
 	event->scancode = scancode;
 	return event;
 }

 event_base* key_released_event::clone() const
 {
 	key_released_event* event = new key_released_event();
 	event->keyboard = keyboard;
 	event->scancode = scancode;
 	return event;
 }

 event_base* mouse_moved_event::clone() const
 {
 	mouse_moved_event* event = new mouse_moved_event();
 	event->mouse = mouse;
 	event->x = x;
 	event->y = y;
 	event->dx = dx;
 	event->dy = dy;
 	return event;
 }

 event_base* mouse_button_pressed_event::clone() const
 {
 	mouse_button_pressed_event* event = new mouse_button_pressed_event();
 	event->mouse = mouse;
 	event->button = button;
 	event->x = x;
 	event->y = y;
 	return event;
 }

 event_base* mouse_button_released_event::clone() const
 {
 	mouse_button_released_event* event = new mouse_button_released_event();
 	event->mouse = mouse;
 	event->button = button;
 	event->x = x;
 	event->y = y;
 	return event;
 }

 event_base* mouse_wheel_scrolled_event::clone() const
 {
 	mouse_wheel_scrolled_event* event = new mouse_wheel_scrolled_event();
 	event->mouse = mouse;
 	event->x = x;
 	event->y = y;
 	return event;
 }

 event_base* game_controller_connected_event::clone() const
 {
 	game_controller_connected_event* event = new game_controller_connected_event();
 	event->game_controller = game_controller;
 	event->reconnected = reconnected;
 	return event;
 }

 event_base* game_controller_disconnected_event::clone() const
 {
 	game_controller_disconnected_event* event = new game_controller_disconnected_event();
 	event->game_controller = game_controller;
 	return event;
 }

 event_base* game_controller_button_pressed_event::clone() const
 {
 	game_controller_button_pressed_event* event = new game_controller_button_pressed_event();
 	event->game_controller = game_controller;
 	event->button = button;
 	return event;
 }

 event_base* game_controller_button_released_event::clone() const
 {
 	game_controller_button_released_event* event = new game_controller_button_released_event();
 	event->game_controller = game_controller;
 	event->button = button;
 	return event;
 }

 event_base* game_controller_axis_moved_event::clone() const
 {
 	game_controller_axis_moved_event* event = new game_controller_axis_moved_event();
 	event->game_controller = game_controller;
 	event->axis = axis;
 	event->value = value;
 	return event;
 }

--- a/src/antkeeper/input/input-events.hpp
+++ b/src/antkeeper/input/input-events.hpp
@ -0,0 +1,173 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_INPUT_EVENT_HPP
 #define ANTKEEPER_INPUT_EVENT_HPP

 #include "event/event.hpp"

 enum class scancode;
 enum class game_controller_axis;
 enum class game_controller_button;
 class keyboard;
 class mouse;
 class game_controller;

 /**
 * Input event which indicates a keyboard key has been pressed.
 */
 class key_pressed_event: public event<key_pressed_event>
 {
 public:
 	virtual event_base* clone() const;

 	keyboard* keyboard;
 	scancode scancode;
 };

 /**
 * Input event which indicates a keyboard key has been released.
 */
 class key_released_event: public event<key_released_event>
 {
 public:
 	virtual event_base* clone() const;

 	keyboard* keyboard;
 	scancode scancode;
 };

 /**
 * Input event which indicates a mouse has been moved.
 */
 class mouse_moved_event: public event<mouse_moved_event>
 {
 public:
 	virtual event_base* clone() const;

 	mouse* mouse;
 	int x;
 	int y;
 	int dx;
 	int dy;
 };

 /**
 * Input event which indicates a mouse button has been pressed.
 */
 class mouse_button_pressed_event: public event<mouse_button_pressed_event>
 {
 public:
 	virtual event_base* clone() const;

 	mouse* mouse;
 	int button;
 	int x;
 	int y;
 };

 /**
 * Input event which indicates a mouse button has been released.
 */
 class mouse_button_released_event: public event<mouse_button_released_event>
 {
 public:
 	virtual event_base* clone() const;

 	mouse* mouse;
 	int button;
 	int x;
 	int y;
 };

 /**
 * Input event which indicates a mouse wheel has been scrolled.
 */
 class mouse_wheel_scrolled_event: public event<mouse_wheel_scrolled_event>
 {
 public:
 	virtual event_base* clone() const;

 	mouse* mouse;
 	int x;
 	int y;
 };

 /**
 * Input event which indicates a controller has been connected.
 */
 class game_controller_connected_event: public event<game_controller_connected_event>
 {
 public:
 	virtual event_base* clone() const;

 	game_controller* game_controller;
 	bool reconnected;
 };

 /**
 * Input event which indicates a controller has been disconnected.
 */
 class game_controller_disconnected_event: public event<game_controller_disconnected_event>
 {
 public:
 	virtual event_base* clone() const;

 	game_controller* game_controller;
 };

 /**
 * Input event which indicates a controller button has been pressed.
 */
 class game_controller_button_pressed_event: public event<game_controller_button_pressed_event>
 {
 public:
 	virtual event_base* clone() const;

 	game_controller* game_controller;
 	game_controller_button button;
 };

 /**
 * Input event which indicates a controller button has been released.
 */
 class game_controller_button_released_event: public event<game_controller_button_released_event>
 {
 public:
 	virtual event_base* clone() const;

 	game_controller* game_controller;
 	game_controller_button button;
 };

 /**
 * Input event which indicates a controller axis has been moved.
 */
 class game_controller_axis_moved_event: public event<game_controller_axis_moved_event>
 {
 public:
 	virtual event_base* clone() const;

 	game_controller* game_controller;
 	game_controller_axis axis;
 	float value;
 };

 #endif // ANTKEEPER_INPUT_EVENT_HPP

--- a/src/antkeeper/input/input-mapper.cpp
+++ b/src/antkeeper/input/input-mapper.cpp
@ -0,0 +1,155 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "input-mapper.hpp"
 #include "mouse.hpp"
 #include "event/event-dispatcher.hpp"

 input_mapper::input_mapper():
 	event_dispatcher(nullptr),
 	control(nullptr),
 	callback(nullptr),
 	enabled(false)
 {}

 input_mapper::~input_mapper()
 {
 	set_event_dispatcher(nullptr);
 }

 void input_mapper::set_event_dispatcher(::event_dispatcher* event_dispatcher)
 {
 	if (this->event_dispatcher)
 	{
 		this->event_dispatcher->unsubscribe<key_pressed_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_moved_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_wheel_scrolled_event>(this);
 		this->event_dispatcher->unsubscribe<mouse_button_pressed_event>(this);
 		this->event_dispatcher->unsubscribe<game_controller_axis_moved_event>(this);
 		this->event_dispatcher->unsubscribe<game_controller_button_pressed_event>(this);
 	}

 	this->event_dispatcher = event_dispatcher;

 	if (event_dispatcher)
 	{
 		event_dispatcher->subscribe<key_pressed_event>(this);
 		event_dispatcher->subscribe<mouse_moved_event>(this);
 		event_dispatcher->subscribe<mouse_wheel_scrolled_event>(this);
 		event_dispatcher->subscribe<mouse_button_pressed_event>(this);
 		event_dispatcher->subscribe<game_controller_axis_moved_event>(this);
 		event_dispatcher->subscribe<game_controller_button_pressed_event>(this);
 	}
 }

 void input_mapper::set_control(::control* control)
 {
 	this->control = control;
 }

 void input_mapper::set_callback(std::function<void(const input_mapping&)> callback)
 {
 	this->callback = callback;
 }

 void input_mapper::set_enabled(bool enabled)
 {
 	this->enabled = enabled;
 }

 void input_mapper::handle_event(const key_pressed_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	callback(key_mapping(control, event.keyboard, event.scancode));
 }

 void input_mapper::handle_event(const mouse_moved_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	if (event.dx != 0)
 	{
 		mouse_motion_axis axis = (event.dx < 0) ? mouse_motion_axis::negative_x : mouse_motion_axis::positive_x;
 		callback(mouse_motion_mapping(control, event.mouse, axis));
 	}

 	if (event.dy != 0)
 	{
 		mouse_motion_axis axis = (event.dy < 0) ? mouse_motion_axis::negative_y : mouse_motion_axis::positive_y;
 		callback(mouse_motion_mapping(control, event.mouse, axis));
 	}
 }

 void input_mapper::handle_event(const mouse_button_pressed_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	callback(mouse_button_mapping(control, event.mouse, event.button));
 }

 void input_mapper::handle_event(const mouse_wheel_scrolled_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	if (event.x != 0)
 	{
 		mouse_wheel_axis axis = (event.x < 0) ? mouse_wheel_axis::negative_x : mouse_wheel_axis::positive_x;
 		callback(mouse_wheel_mapping(control, event.mouse, axis));
 	}

 	if (event.y != 0)
 	{
 		mouse_wheel_axis axis = (event.y < 0) ? mouse_wheel_axis::negative_y : mouse_wheel_axis::positive_y;
 		callback(mouse_wheel_mapping(control, event.mouse, axis));
 	}
 }

 void input_mapper::handle_event(const game_controller_button_pressed_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	callback(game_controller_button_mapping(control, event.game_controller, event.button));
 }

 void input_mapper::handle_event(const game_controller_axis_moved_event& event)
 {
 	if (!is_enabled() || !callback)
 	{
 		return;
 	}

 	callback(game_controller_axis_mapping(control, event.game_controller, event.axis, (event.value < 0.0f)));
 }

--- a/src/antkeeper/input/input-mapper.hpp
+++ b/src/antkeeper/input/input-mapper.hpp
@ -0,0 +1,103 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_INPUT_MAPPER_HPP
 #define ANTKEEPER_INPUT_MAPPER_HPP

 #include "input-events.hpp"
 #include "input-mapping.hpp"
 #include "event/event-handler.hpp"
 #include <functional>

 class event_dispatcher;

 /**
 * An input mapper takes a control and listens to input events then generates corresponding input mappings which can be added to an input router.
 */
 class input_mapper:
 	public event_handler<key_pressed_event>,
 	public event_handler<mouse_moved_event>,
 	public event_handler<mouse_wheel_scrolled_event>,
 	public event_handler<mouse_button_pressed_event>,
 	public event_handler<game_controller_axis_moved_event>,
 	public event_handler<game_controller_button_pressed_event>
 {
 public:
 	/**
 	 * Creates an input mapper.
 	 */
 	input_mapper();

 	/**
 	 * Destroys an input mapper.
 	 */
 	virtual ~input_mapper();

 	/**
 	 * Sets the event dispatcher to which this input event router will subscribe itself.
 	 */
 	void set_event_dispatcher(event_dispatcher* event_dispatcher);

 	/**
 	 * Sets the control for which input mappings will be generated.
 	 *
 	 * @param control ::control for which input mappings will be generated.
 	 */
 	void set_control(::control* control);

 	/**
 	 * Sets the callback function to the input mappings generated by this input mapper.
 	 *
 	 * @param callback Callback function operates on an input mapping.
 	 */
 	void set_callback(std::function<void(const input_mapping&)> callback);

 	/**
 	 * Enables or disables the input mapping generation.
 	 *
 	 * @param enabled Whether to enable input mapping generation or not.
 	 */
 	void set_enabled(bool enabled);

 	/**
 	 * Returns true if input mapping generation is enabled.
 	 */
 	bool is_enabled() const;
 	
 private:
 	void handle_event(const key_pressed_event& event);
 	void handle_event(const mouse_moved_event& event);
 	void handle_event(const mouse_wheel_scrolled_event& event);
 	void handle_event(const mouse_button_pressed_event& event);
 	void handle_event(const game_controller_axis_moved_event& event);
 	void handle_event(const game_controller_button_pressed_event& event);

 	event_dispatcher* event_dispatcher;
 	::control* control;
 	std::function<void(const input_mapping&)> callback;
 	bool enabled;
 };

 inline bool input_mapper::is_enabled() const
 {
 	return enabled;
 }

 #endif // ANTKEEPER_INPUT_MAPPER_HPP

--- a/src/antkeeper/input/input-mapping.cpp
+++ b/src/antkeeper/input/input-mapping.cpp
@ -0,0 +1,141 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "input-mapping.hpp"

 input_mapping::input_mapping(::control* control):
 	control(control)
 {}

 key_mapping::key_mapping(const key_mapping& mapping)
 {
 	*this = mapping;
 }

 key_mapping::key_mapping(::control* control, ::keyboard* keyboard, ::scancode scancode):
 	input_mapping(control),
 	keyboard(keyboard),
 	scancode(scancode)
 {}

 key_mapping& key_mapping::operator=(const key_mapping& mapping)
 {
 	control = mapping.control;
 	keyboard = mapping.keyboard;
 	scancode = mapping.scancode;
 	return *this;
 }

 mouse_motion_mapping::mouse_motion_mapping(const mouse_motion_mapping& mapping)
 {
 	*this = mapping;
 }

 mouse_motion_mapping::mouse_motion_mapping(::control* control, ::mouse* mouse, mouse_motion_axis axis):
 	input_mapping(control),
 	mouse(mouse),
 	axis(axis)
 {}

 mouse_motion_mapping& mouse_motion_mapping::operator=(const mouse_motion_mapping& mapping)
 {
 	control = mapping.control;
 	mouse = mapping.mouse;
 	axis = mapping.axis;
 	return *this;
 }

 mouse_wheel_mapping::mouse_wheel_mapping(const mouse_wheel_mapping& mapping)
 {
 	*this = mapping;
 }

 mouse_wheel_mapping::mouse_wheel_mapping(::control* control, ::mouse* mouse, ::mouse_wheel_axis axis):
 	input_mapping(control),
 	mouse(mouse),
 	axis(axis)
 {}

 mouse_wheel_mapping& mouse_wheel_mapping::operator=(const mouse_wheel_mapping& mapping)
 {
 	control = mapping.control;
 	mouse = mapping.mouse;
 	axis = mapping.axis;
 	return *this;
 }

 mouse_button_mapping::mouse_button_mapping(const mouse_button_mapping& mapping)
 {
 	*this = mapping;
 }

 mouse_button_mapping::mouse_button_mapping(::control* control, ::mouse* mouse, int button):
 	input_mapping(control),
 	mouse(mouse),
 	button(button)
 {}

 mouse_button_mapping& mouse_button_mapping::operator=(const mouse_button_mapping& mapping)
 {
 	control = mapping.control;
 	mouse = mapping.mouse;
 	button = mapping.button;
 	return *this;
 }

 game_controller_axis_mapping::game_controller_axis_mapping(const game_controller_axis_mapping& mapping)
 {
 	*this = mapping;
 }

 game_controller_axis_mapping::game_controller_axis_mapping(::control* control, ::game_controller* game_controller, game_controller_axis axis, bool negative):
 	input_mapping(control),
 	game_controller(game_controller),
 	axis(axis),
 	negative(negative)
 {}

 game_controller_axis_mapping& game_controller_axis_mapping::operator=(const game_controller_axis_mapping& mapping)
 {
 	control = mapping.control;
 	game_controller = mapping.game_controller;
 	axis = mapping.axis;
 	negative = mapping.negative;
 	return *this;
 }

 game_controller_button_mapping::game_controller_button_mapping(const game_controller_button_mapping& mapping)
 {
 	*this = mapping;
 }

 game_controller_button_mapping::game_controller_button_mapping(::control* control, ::game_controller* game_controller, game_controller_button button):
 	input_mapping(control),
 	game_controller(game_controller),
 	button(button)
 {}

 game_controller_button_mapping& game_controller_button_mapping::operator=(const game_controller_button_mapping& mapping)
 {
 	control = mapping.control;
 	game_controller = mapping.game_controller;
 	button = mapping.button;
 	return *this;
 }

--- a/src/antkeeper/input/input-mapping.hpp
+++ b/src/antkeeper/input/input-mapping.hpp
@ -0,0 +1,198 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_INPUT_MAPPING_HPP
 #define ANTKEEPER_INPUT_MAPPING_HPP

 enum class mouse_motion_axis;
 enum class mouse_wheel_axis;
 enum class scancode;
 enum class game_controller_axis;
 enum class game_controller_button;
 class control;
 class keyboard;
 class mouse;
 class game_controller;

 /**
 * Enumerates the supported types of control mappings.
 */
 enum class input_mapping_type
 {
 	key,
 	mouse_motion,
 	mouse_wheel,
 	mouse_button,
 	game_controller_axis,
 	game_controller_button
 };

 /**
 * Abstract base class for input mappings.
 */
 class input_mapping
 {
 public:
 	input_mapping() = default;
 	input_mapping(::control* control);
 	virtual ~input_mapping() = default;

 	/// Returns this control mapping's type.
 	virtual input_mapping_type get_type() const = 0;

 	control* control;
 };

 /**
 * A mapping between a control and a keyboard key.
 */
 class key_mapping: public input_mapping
 {
 public:
 	key_mapping() = default;
 	key_mapping(const key_mapping& mapping);
 	key_mapping(::control* control, keyboard* keyboard, scancode scancode);
 	virtual ~key_mapping() = default;
 	key_mapping& operator=(const key_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	keyboard* keyboard;
 	scancode scancode;
 };

 inline input_mapping_type key_mapping::get_type() const
 {
 	return input_mapping_type::key;
 }

 /**
 * A mapping between a control and a mouse motion axis.
 */
 class mouse_motion_mapping: public input_mapping
 {
 public:
 	mouse_motion_mapping() = default;
 	mouse_motion_mapping(const mouse_motion_mapping& mapping);
 	mouse_motion_mapping(::control* control, ::mouse* mouse, mouse_motion_axis axis);
 	virtual ~mouse_motion_mapping() = default;
 	mouse_motion_mapping& operator=(const mouse_motion_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	mouse* mouse;
 	mouse_motion_axis axis;
 };

 inline input_mapping_type mouse_motion_mapping::get_type() const
 {
 	return input_mapping_type::mouse_motion;
 }

 /**
 * A mapping between a control and a mouse wheel axis.
 */
 class mouse_wheel_mapping: public input_mapping
 {
 public:
 	mouse_wheel_mapping() = default;
 	mouse_wheel_mapping(const mouse_wheel_mapping& mapping);
 	mouse_wheel_mapping(::control* control, mouse* mouse, mouse_wheel_axis axis);
 	virtual ~mouse_wheel_mapping() = default;
 	mouse_wheel_mapping& operator=(const mouse_wheel_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	mouse* mouse;
 	mouse_wheel_axis axis;
 };

 inline input_mapping_type mouse_wheel_mapping::get_type() const
 {
 	return input_mapping_type::mouse_wheel;
 }

 /**
 * A mapping between a control and a mouse button.
 */
 class mouse_button_mapping: public input_mapping
 {
 public:
 	mouse_button_mapping() = default;
 	mouse_button_mapping(const mouse_button_mapping& mapping);
 	mouse_button_mapping(::control* control, mouse* mouse, int button);
 	virtual ~mouse_button_mapping() = default;
 	mouse_button_mapping& operator=(const mouse_button_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	mouse* mouse;
 	int button;
 };

 inline input_mapping_type mouse_button_mapping::get_type() const
 {
 	return input_mapping_type::mouse_button;
 }

 /**
 * A mapping between a control and a game controller axis.
 */
 class game_controller_axis_mapping: public input_mapping
 {
 public:
 	game_controller_axis_mapping() = default;
 	game_controller_axis_mapping(const game_controller_axis_mapping& mapping);
 	game_controller_axis_mapping(::control* control, game_controller* game_controller, game_controller_axis axis, bool negative);
 	virtual ~game_controller_axis_mapping() = default;
 	game_controller_axis_mapping& operator=(const game_controller_axis_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	game_controller* game_controller;
 	game_controller_axis axis;
 	bool negative;
 };

 inline input_mapping_type game_controller_axis_mapping::get_type() const
 {
 	return input_mapping_type::game_controller_axis;
 }

 /**
 * A mapping between a control and a game controller button.
 *
 * @ingroup input.
 */
 class game_controller_button_mapping: public input_mapping
 {
 public:
 	game_controller_button_mapping() = default;
 	game_controller_button_mapping(const game_controller_button_mapping& mapping);
 	game_controller_button_mapping(::control* control, game_controller* game_controller, game_controller_button button);
 	virtual ~game_controller_button_mapping() = default;
 	game_controller_button_mapping& operator=(const game_controller_button_mapping& mapping);
 	virtual input_mapping_type get_type() const;

 	game_controller* game_controller;
 	game_controller_button button;
 };

 inline input_mapping_type game_controller_button_mapping::get_type() const
 {
 	return input_mapping_type::game_controller_button;
 }

 #endif // ANTKEEPER_INPUT_MAPPING_HPP

--- a/src/antkeeper/input/keyboard.cpp
+++ b/src/antkeeper/input/keyboard.cpp
@ -0,0 +1,341 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "keyboard.hpp"
 #include "scancode.hpp"
 #include "event/event-dispatcher.hpp"
 #include "input-events.hpp"

 const char* keyboard::get_scancode_name(scancode scancode)
 {
 	return scancode_names[static_cast<std::size_t>(scancode)];
 };

 scancode keyboard::get_scancode_from_name(const char* name)
 {
 	auto it = scancode_map.find(std::string(name));
 	if (it == scancode_map.end())
 	{
 		return scancode::unknown;
 	}

 	return it->second;
 }

 keyboard::keyboard()
 {}

 keyboard::~keyboard()
 {}

 void keyboard::press(scancode scancode)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	key_pressed_event event;
 	event.keyboard = this;
 	event.scancode = scancode;

 	input_device::event_dispatcher->queue(event);
 }

 void keyboard::release(scancode scancode)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	key_released_event event;
 	event.keyboard = this;
 	event.scancode = scancode;

 	input_device::event_dispatcher->queue(event);
 }

 std::map<std::string, scancode> keyboard::build_scancode_map()
 {
 	std::map<std::string, scancode> scancode_map;
 	for (std::size_t i = 0; i <= static_cast<std::size_t>(scancode::audio_fast_forward); ++i)
 	{
 		if (scancode_names[i] != nullptr)
 		{
 			std::string scancode_name = scancode_names[i];
 			scancode_map[scancode_name] = static_cast<scancode>(i);
 		}
 	}

 	return scancode_map;
 }

 const char* keyboard::scancode_names[] =
 {
 	nullptr, // UNKNOWN
 	"A", // A
 	"B", // B
 	"C", // C
 	"D", // D
 	"E", // E
 	"F", // F
 	"G", // G
 	"H", // H
 	"I", // I
 	"J", // J
 	"K", // K
 	"L", // L
 	"M", // M
 	"N", // N
 	"O", // O
 	"P", // P
 	"Q", // Q
 	"R", // R
 	"S", // S
 	"T", // T
 	"U", // U
 	"V", // V
 	"W", // W
 	"X", // X
 	"Y", // Y
 	"Z", // Z
 	"1", // ONE
 	"2", // TWO
 	"3", // THREE
 	"4", // FOUR
 	"5", // FIVE
 	"6", // SIX
 	"7", // SEVEN
 	"8", // EIGHT
 	"9", // NINE
 	"0", // ZERO
 	"Enter", // ENTER
 	"Escape", // ESCAPE
 	"Backspace", // BACKSPACE
 	"Tab", // TAB
 	"Space", // SPACE
 	"-", // MINUS
 	"=", // EQUALS
 	"[", // LEFTBRACKET
 	"]", // RIGHTBRACKET
 	"\\", // BACKSLASH
 	"#", // NONUSHASH
 	";", // SEMICOLON
 	"'", // APOSTROPHE
 	"`", // GRAVE
 	",", // COMMA
 	".", // PERIOD
 	"/", // SLASH
 	"Caps Lock", // CAPSLOCK
 	"F1", // F1
 	"F2", // F2
 	"F3", // F3
 	"F4", // F4
 	"F5", // F5
 	"F6", // F6
 	"F7", // F7
 	"F8", // F8
 	"F9", // F9
 	"F10", // F10
 	"F11", // F11
 	"F12", // F12
 	"Print Screen", // PRINTSCREEN
 	"Scroll Lock", // SCROLLLOCK
 	"Pause", // PAUSE
 	"Insert", // INSERT
 	"Home", // HOME
 	"Page Up", // PAGEUP
 	"Delete", // DELETE
 	"End", // END
 	"Page Down", // PAGEDOWN
 	"Right", // RIGHT
 	"Left", // LEFT
 	"Down", // DOWN
 	"Up", // UP
 	"Num Lock", // NUMLOCKCLEAR
 	"Keypad /", // KP_DIVIDE
 	"Keypad *", // KP_MULTIPLY
 	"Keypad -", // KP_MINUS
 	"Keypad +", // KP_PLUS
 	"Keypad Enter", // KP_ENTER
 	"Keypad 1", // KP_1
 	"Keypad 2", // KP_2
 	"Keypad 3", // KP_3
 	"Keypad 4", // KP_4
 	"Keypad 5", // KP_5
 	"Keypad 6", // KP_6
 	"Keypad 7", // KP_7
 	"Keypad 8", // KP_8
 	"Keypad 9", // KP_9
 	"Keypad 0", // KP_0
 	"Keypad .", // KP_PERIOD
 	nullptr, // NONUSBACKSLASH
 	"Application", // APPLICATION
 	"Power", // POWER
 	"Keypad =", // KP_EQUALS
 	"F13", // F13
 	"F14", // F14
 	"F15", // F15
 	"F16", // F16
 	"F17", // F17
 	"F18", // F18
 	"F19", // F19
 	"F20", // F20
 	"F21", // F21
 	"F22", // F22
 	"F23", // F23
 	"F24", // F24
 	"Execute", // EXECUTE
 	"Help", // HELP
 	"Menu", // MENU
 	"Select", // SELECT
 	"Stop", // STOP
 	"Again", // AGAIN
 	"Undo", // UNDO
 	"Cut", // CUT
 	"Copy", // COPY
 	"Paste", // PASTE
 	"Find", // FIND
 	"Mute", // MUTE
 	"Volume Up", // VOLUMEUP
 	"Volume Down", // VOLUMEDOWN
 	nullptr, // LOCKINGCAPSLOCK
 	nullptr, // LOCKINGNUMLOCK
 	nullptr, // LOCKINGSCROLLLOCK
 	"Keypad ,", // KP_COMMA
 	"Keypad = (AS400)", // KP_EQUALSAS400
 	nullptr, // INTERNATIONAL1
 	nullptr, // INTERNATIONAL2
 	nullptr, // INTERNATIONAL3
 	nullptr, // INTERNATIONAL4
 	nullptr, // INTERNATIONAL5
 	nullptr, // INTERNATIONAL6
 	nullptr, // INTERNATIONAL7
 	nullptr, // INTERNATIONAL8
 	nullptr, // INTERNATIONAL9
 	nullptr, // LANG1
 	nullptr, // LANG2
 	nullptr, // LANG3
 	nullptr, // LANG4
 	nullptr, // LANG5
 	nullptr, // LANG6
 	nullptr, // LANG7
 	nullptr, // LANG8
 	nullptr, // LANG9
 	"Alt Erase", // ALTERASE
 	"Sys Req", // SYSREQ
 	"Cancel", // CANCEL
 	"Clear", // CLEAR
 	"Prior", // PRIOR
 	"Return", // RETURN2
 	"Separator", // SEPARATOR
 	"Out", // OUT
 	"Oper", // OPER
 	"Clear/Again", // CLEARAGAIN
 	"CrSel", // CRSEL
 	"ExSel", // EXSEL
 	"Keypad 00", // KP_00
 	"Keypad 000", // KP_000
 	"Thousands Separator", // THOUSANDSSEPARATOR
 	"Decimal Separator", // DECIMALSEPARATOR
 	"Currency Unit", // CURRENCYUNIT
 	"Currency Sub-Unit", // CURRENCYSUBUNIT
 	"Keypad (", // KP_LEFTPAREN
 	"Keypad )", // KP_RIGHTPAREN
 	"Keypad {", // KP_LEFTBRACE
 	"Keypad }", // KP_RIGHTBRACE
 	"Keypad Tab", // KP_TAB
 	"Keypad Backspace", // KP_BACKSPACE
 	"Keypad A", // KP_A
 	"Keypad B", // KP_B
 	"Keypad C", // KP_C
 	"Keypad D", // KP_D
 	"Keypad E", // KP_E
 	"Keypad F", // KP_F
 	"Keypad XOR", // KP_XOR
 	"Keypad ^", // KP_POWER
 	"Keypad %", // KP_PERCENT
 	"Keypad <", // KP_LESS
 	"Keypad >", // KP_GREATER
 	"Keypad &", // KP_AMPERSAND
 	"Keypad &&", // KP_DBLAMPERSAND
 	"Keypad |", // KP_VERTICALBAR
 	"Keypad ||", // KP_DBLVERTICALBAR
 	"Keypad :", // KP_COLON
 	"Keypad #", // KP_HASH
 	"Keypad Space", // KP_SPACE
 	"Keypad @", // KP_AT
 	"Keypad !", // KP_EXCLAM
 	"Keypad Mem Store", // KP_MEMSTORE
 	"Keypad Mem Recall", // KP_MEMRECALL
 	"Keypad Mem Clear", // KP_MEMCLEAR
 	"Keypad Mem Add", // KP_MEMADD
 	"Keypad Mem Subtract", // KP_MEMSUBTRACT
 	"Keypad Mem Multiply", // KP_MEMMULTIPLY
 	"Keypad Mem Divide", // KP_MEMDIVIDE
 	"Keypad +/-", // KP_PLUSMINUS
 	"Keypad Clear", // KP_CLEAR
 	"Keypad Clear Entry", // KP_CLEARENTRY
 	"Keypad Binary", // KP_BINARY
 	"Keypad Octal", // KP_OCTAL
 	"Keypad Decimal", // KP_DECIMAL
 	"Keypad Hexadecimal", // KP_HEXADECIMAL
 	"Left Ctrl", // LCTRL
 	"Left Shift", // LSHIFT
 	"Left Alt", // LALT
 	"Left GUI", // LGUI
 	"Right Ctrl", // RCTRL
 	"Right Shift", // RSHIFT
 	"Right Alt", // RALT
 	"Right GUI", // RGUI
 	"Mode Switch", // MODE
 	"Audio Next", // AUDIONEXT
 	"Audio Prev", // AUDIOPREV
 	"Audio Stop", // AUDIOSTOP
 	"Audio Play", // AUDIOPLAY
 	"Audio Mute", // AUDIOMUTE
 	"Media Select", // MEDIASELECT
 	"WWW", // WWW
 	"Mail", // MAIL
 	"Calculator", // CALCULATOR
 	"Computer", // COMPUTER
 	"AC Search", // AC_SEARCH
 	"AC Home", // AC_HOME
 	"AC Back", // AC_BACK
 	"AC Forward", // AC_FORWARD
 	"AC Stop", // AC_STOP
 	"AC Refresh", // AC_REFRESH
 	"AC Bookmarks", // AC_BOOKMARKS
 	"Brightness Down", // BRIGHTNESSDOWN
 	"Brightness Up", // BRIGHTNESSUP
 	"Display Switch", // DISPLAYSWITCH
 	"KBD Illum Toggle", // KBDILLUMTOGGLE
 	"KBD Illum Down", // KBDILLUMDOWN
 	"KBD Illum Up", // KBDILLUMUP
 	"Eject", // EJECT
 	"Sleep", // SLEEP
 	"App 1", // APP1
 	"App 2", // APP2
 	"Audio Rewind", // AUDIOREWIND
 	"Audio Fast-Forward", // AUDIOFASTFORWARD
 };

 std::map<std::string, scancode> keyboard::scancode_map = keyboard::build_scancode_map();

--- a/src/antkeeper/input/keyboard.hpp
+++ b/src/antkeeper/input/keyboard.hpp
@ -0,0 +1,77 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_KEYBOARD_HPP
 #define ANTKEEPER_KEYBOARD_HPP

 #include "input-device.hpp"
 #include <map>
 #include <string>

 enum class scancode;

 /**
 * A virtual keyboard which can generate keyboard-related input events and pass them to an event dispatcher.
 */
 class keyboard: public input_device
 {
 public:
 	/**
 	 * Returns the UTF-8 encoded name of a scancode.
 	 */
 	static const char* get_scancode_name(scancode scancode);

 	/**
 	 * Returns the scancode corresponding to a scancode name.
 	 *
 	 * @param name Name of a scancode.
 	 * @return Corresponding scancode, or nullptr if a matching scancode was not found.
 	 */
 	static scancode get_scancode_from_name(const char* name);

 	/**
 	 * Creates a keyboard input device.
 	 */
 	keyboard();

 	/// Destroys a keyboard input device.
 	virtual ~keyboard();
 	
 	/**
 	 * Simulates a key press.
 	 *
 	 * @param scancode scancode of the simulated key press.
 	 */
 	void press(scancode scancode);

 	/**
 	 * Simulates a key release.
 	 *
 	 * @param scancode scancode of the simulated key release.
 	 */
 	void release(scancode scancode);

 private:
 	static std::map<std::string, scancode> build_scancode_map();
 	static const char* scancode_names[];
 	static std::map<std::string, scancode> scancode_map;
 };

 #endif // ANTKEEPER_KEYBOARD_HPP

--- a/src/antkeeper/input/mouse.cpp
+++ b/src/antkeeper/input/mouse.cpp
@ -0,0 +1,93 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "mouse.hpp"
 #include "input-events.hpp"
 #include "event/event-dispatcher.hpp"

 mouse::mouse()
 {}

 void mouse::press(int button, int x, int y)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	mouse_button_pressed_event event;
 	event.mouse = this;
 	event.button = button;
 	event.x = x;
 	event.y = y;

 	input_device::event_dispatcher->queue(event);
 }

 void mouse::release(int button, int x, int y)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	mouse_button_released_event event;
 	event.mouse = this;
 	event.button = button;
 	event.x = x;
 	event.y = y;

 	input_device::event_dispatcher->queue(event);
 }

 void mouse::move(int x, int y, int dx, int dy)
 {
 	previous_position = current_position;
 	current_position = {x, y};

 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	mouse_moved_event event;
 	event.mouse = this;
 	event.x = x;
 	event.y = y;
 	event.dx = dx;
 	event.dy = dy;

 	input_device::event_dispatcher->queue(event);
 }

 void mouse::scroll(int x, int y)
 {
 	if (!input_device::event_dispatcher)
 	{
 		return;
 	}

 	mouse_wheel_scrolled_event event;
 	event.mouse = this;
 	event.x = x;
 	event.y = y;

 	input_device::event_dispatcher->queue(event);
 }

--- a/src/antkeeper/input/mouse.hpp
+++ b/src/antkeeper/input/mouse.hpp
@ -0,0 +1,131 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MOUSE_HPP
 #define ANTKEEPER_MOUSE_HPP

 #include "input-device.hpp"
 #include <tuple>

 /**
 * Enumerates the mouse motion axes.
 */
 enum class mouse_motion_axis
 {
 	/// Indicates the positive X-axis.
 	positive_x,

 	/// Indicates the negative X-axis.
 	negative_x,

 	/// Indicates the positive Y-axis.
 	positive_y,

 	/// Indicates the negative Y-axis.
 	negative_y
 };

 /**
 * Enumerates the mouse wheel axes.
 */
 enum class mouse_wheel_axis
 {
 	/// Indicates the positive X-axis.
 	positive_x,

 	/// Indicates the negative X-axis.
 	negative_x,

 	/// Indicates the positive Y-axis.
 	positive_y,

 	/// Indicates the negative Y-axis.
 	negative_y
 };

 /**
 * A virtual mouse which can generate mouse-related input events and pass them to an event dispatcher.
 */
 class mouse: public input_device
 {
 public:
 	/**
 	 * Creates a mouse input device.
 	 */
 	mouse();

 	/// Destroys a mouse input device.
 	virtual ~mouse() = default;
 	
 	/**
 	 * Simulates a mouse button press.
 	 *
 	 * @param button Index of the pressed button.
 	 * @param x X-coordinate of the mouse position.
 	 * @param y Y-coordinate of the mouse position.
 	 */
 	void press(int button, int x, int y);

 	/**
 	 * Simulates a mouse button release.	
 	 *
 	 * @param button Index of the released button.
 	 * @param x X-coordinate of the mouse position.
 	 * @param y Y-coordinate of the mouse position.
 	 */
 	void release(int button, int x, int y);

 	/**
 	 * Simulates mouse movement.
 	 *
 	 * @param x X-coordinate of the mouse position.
 	 * @param y Y-coordinate of the mouse position.
 	 * @param dx Relative movement on the X-axis.
 	 * @param dy Relative movement on the Y-axis.
 	 */
 	void move(int x, int y, int dx, int dy);

 	/**
 	 * Simulates mouse wheel scrolling.
 	 */
 	void scroll(int x, int y);
 	
 	/// Returns the current mouse position.
 	const std::tuple<int, int>& get_current_position() const;

 	/// Returns the previous mouse position.
 	const std::tuple<int, int>& get_previous_position() const;
 	
 private:
 	std::tuple<int, int> current_position;
 	std::tuple<int, int> previous_position;
 };

 inline const std::tuple<int, int>& mouse::get_current_position() const
 {
 	return current_position;
 }

 inline const std::tuple<int, int>& mouse::get_previous_position() const
 {
 	return previous_position;
 }

 #endif // ANTKEEPER_MOUSE_HPP

--- a/src/antkeeper/input/scancode.hpp
+++ b/src/antkeeper/input/scancode.hpp
@ -0,0 +1,277 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_SCANCODE_HPP
 #define ANTKEEPER_SCANCODE_HPP

 /**
 * Enumerates keyboard scancodes.
 */
 enum class scancode
 {
 	unknown,
 	a,
 	b,
 	c,
 	d,
 	e,
 	f,
 	g,
 	h,
 	i,
 	j,
 	k,
 	l,
 	m,
 	n,
 	o,
 	p,
 	q,
 	r,
 	s,
 	t,
 	u,
 	v,
 	w,
 	x,
 	y,
 	z,
 	one,
 	two,
 	three,
 	four,
 	five,
 	six,
 	seven,
 	eight,
 	nine,
 	zero,
 	enter,
 	escape,
 	backspace,
 	tab,
 	space,
 	minus,
 	equal,
 	left_brace,
 	right_brace,
 	backslash,
 	non_us_hash,
 	semicolon,
 	apostrophe,
 	grave,
 	comma,
 	dot,
 	slash,
 	caps_lock,
 	f1,
 	f2,
 	f3,
 	f4,
 	f5,
 	f6,
 	f7,
 	f8,
 	f9,
 	f10,
 	f11,
 	f12,
 	print_screen,
 	scroll_lock,
 	pause,
 	insert,
 	home,
 	page_up,
 	del,
 	end,
 	page_down,
 	right,
 	left,
 	down,
 	up,
 	num_lock,
 	kp_slash,
 	kp_asterisk,
 	kp_minus,
 	kp_plus,
 	kp_enter,
 	kp_1,
 	kp_2,
 	kp_3,
 	kp_4,
 	kp_5,
 	kp_6,
 	kp_7,
 	kp_8,
 	kp_9,
 	kp_0,
 	kp_dot,
 	non_us_backslash,
 	application,
 	power,
 	kp_equal,
 	f13,
 	f14,
 	f15,
 	f16,
 	f17,
 	f18,
 	f19,
 	f20,
 	f21,
 	f22,
 	f23,
 	f24,
 	execute,
 	help,
 	menu,
 	select,
 	stop,
 	again,
 	undo,
 	cut,
 	copy,
 	paste,
 	find,
 	mute,
 	volume_up,
 	volume_down,
 	locking_caps_lock,
 	locking_num_lock,
 	locking_scroll_lock,
 	kp_comma,
 	kp_equal_as400,
 	international_1,
 	international_2,
 	international_3,
 	international_4,
 	international_5,
 	international_6,
 	international_7,
 	international_8,
 	international_9,
 	lang_1,
 	lang_2,
 	lang_3,
 	lang_4,
 	lang_5,
 	lang_6,
 	lang_7,
 	lang_8,
 	lang_9,
 	alt_erase,
 	sys_req,
 	cancel,
 	clear,
 	prior,
 	return_2,
 	separator,
 	_out,
 	oper,
 	clear_again,
 	cr_sel,
 	ex_sel,
 	kp_00,
 	kp_000,
 	thousands_separator,
 	decimal_separator,
 	currency_unit,
 	currency_sub_unit,
 	kp_left_paren,
 	kp_right_paren,
 	kp_left_brace,
 	kp_right_brace,
 	kp_tab,
 	kp_backspace,
 	kp_a,
 	kp_b,
 	kp_c,
 	kp_d,
 	kp_e,
 	kp_f,
 	kp_xor,
 	kp_power,
 	kp_percent,
 	kp_less,
 	kp_greater,
 	kp_ampersand,
 	kp_double_ampersand,
 	kp_vertical_bar,
 	kp_double_vertical_bar,
 	kp_colon,
 	kp_hash,
 	kp_space,
 	kp_at,
 	kp_exclam,
 	kp_mem_store,
 	kp_mem_recall,
 	kp_mem_clear,
 	kp_mem_add,
 	kp_mem_subtract,
 	kp_mem_multiply,
 	kp_mem_divide,
 	kp_plus_minus,
 	kp_clear,
 	kp_clear_entry,
 	kp_binary,
 	kp_octal,
 	kp_decimal,
 	kp_hexadecimal,
 	left_ctrl,
 	left_shift,
 	left_alt,
 	left_gui,
 	right_ctrl,
 	right_shift,
 	right_alt,
 	right_gui,
 	mode,
 	audio_next,
 	audio_prev,
 	audio_stop,
 	audio_play,
 	audio_mute,
 	media_select,
 	www,
 	mail,
 	calculator,
 	computer,
 	ac_search,
 	ac_home,
 	ac_back,
 	ac_forward,
 	ac_stop,
 	ac_refresh,
 	ac_bookmarks,
 	brightness_down,
 	brightness_up,
 	display_switch,
 	kbd_illum_toggle,
 	kbd_illum_down,
 	kbd_illum_up,
 	eject,
 	sleep,
 	app_1,
 	app_2,
 	audio_rewind,
 	audio_fast_forward
 };

 #endif // ANTKEEPER_SCANCODE_HPP

--- a/src/antkeeper/input/sdl-game-controller-tables.cpp
+++ b/src/antkeeper/input/sdl-game-controller-tables.cpp
@ -0,0 +1,51 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "sdl-game-controller-tables.hpp"
 #include "game-controller.hpp"

 const game_controller_button sdl_button_table[15] =
 {
 	game_controller_button::a, // SDL_CONTROLLER_BUTTON_A,
 	game_controller_button::b, // SDL_CONTROLLER_BUTTON_B,
 	game_controller_button::x, // SDL_CONTROLLER_BUTTON_X,
 	game_controller_button::y, // SDL_CONTROLLER_BUTTON_Y,
 	game_controller_button::back, // SDL_CONTROLLER_BUTTON_BACK,
 	game_controller_button::guide, // SDL_CONTROLLER_BUTTON_GUIDE,
 	game_controller_button::start, // SDL_CONTROLLER_BUTTON_START,
 	game_controller_button::left_stick, // SDL_CONTROLLER_BUTTON_LEFTSTICK,
 	game_controller_button::right_stick, // SDL_CONTROLLER_BUTTON_RIGHTSTICK,
 	game_controller_button::left_shoulder, // SDL_CONTROLLER_BUTTON_LEFTSHOULDER,
 	game_controller_button::right_shoulder, // SDL_CONTROLLER_BUTTON_RIGHTSHOULDER,
 	game_controller_button::dpad_up, // SDL_CONTROLLER_BUTTON_DPAD_UP,
 	game_controller_button::dpad_down, // SDL_CONTROLLER_BUTTON_DPAD_DOWN,
 	game_controller_button::dpad_left, // SDL_CONTROLLER_BUTTON_DPAD_LEFT,
 	game_controller_button::dpad_right, // SDL_CONTROLLER_BUTTON_DPAD_RIGHT,
 };

 const game_controller_axis sdl_axis_table[6] =
 {
 	game_controller_axis::left_x, // SDL_CONTROLLER_AXIS_LEFTX,
 	game_controller_axis::left_y, // SDL_CONTROLLER_AXIS_LEFTY,
 	game_controller_axis::right_x, // SDL_CONTROLLER_AXIS_RIGHTX,
 	game_controller_axis::right_y, // SDL_CONTROLLER_AXIS_RIGHTY,
 	game_controller_axis::trigger_left, // SDL_CONTROLLER_AXIS_TRIGGERLEFT,
 	game_controller_axis::trigger_right, // SDL_CONTROLLER_AXIS_TRIGGERRIGHT,
 };

--- a/src/antkeeper/input/sdl-game-controller-tables.hpp
+++ b/src/antkeeper/input/sdl-game-controller-tables.hpp
@ -0,0 +1,30 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_SDL_GAME_CONTROLLER_TABLES_HPP
 #define ANTKEEPER_SDL_GAME_CONTROLLER_TABLES_HPP

 enum class game_controller_button;
 enum class game_controller_axis;

 extern const game_controller_button sdl_button_table[15];
 extern const game_controller_axis sdl_axis_table[6];

 #endif // ANTKEEPER_SDL_GAME_CONTROLLER_TABLES_HPP

--- a/src/antkeeper/input/sdl-scancode-table.cpp
+++ b/src/antkeeper/input/sdl-scancode-table.cpp
@ -0,0 +1,313 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "sdl-scancode-table.hpp"
 #include "scancode.hpp"

 const scancode sdl_scancode_table[287] =
 {
 	scancode::unknown, // SDL_SCANCODE_UNKNOWN = 0,
 	scancode::unknown, // Unassigned = 1
 	scancode::unknown, // Unassigned = 2
 	scancode::unknown, // Unassigned = 3
 	scancode::a, // SDL_SCANCODE_A = 4,
 	scancode::b, // SDL_SCANCODE_B = 5,
 	scancode::c, // SDL_SCANCODE_C = 6,
 	scancode::d, // SDL_SCANCODE_D = 7,
 	scancode::e, // SDL_SCANCODE_E = 8,
 	scancode::f, // SDL_SCANCODE_F = 9,
 	scancode::g, // SDL_SCANCODE_G = 10,
 	scancode::h, // SDL_SCANCODE_H = 11,
 	scancode::i, // SDL_SCANCODE_I = 12,
 	scancode::j, // SDL_SCANCODE_J = 13,
 	scancode::k, // SDL_SCANCODE_K = 14,
 	scancode::l, // SDL_SCANCODE_L = 15,
 	scancode::m, // SDL_SCANCODE_M = 16,
 	scancode::n, // SDL_SCANCODE_N = 17,
 	scancode::o, // SDL_SCANCODE_O = 18,
 	scancode::p, // SDL_SCANCODE_P = 19,
 	scancode::q, // SDL_SCANCODE_Q = 20,
 	scancode::r, // SDL_SCANCODE_R = 21,
 	scancode::s, // SDL_SCANCODE_S = 22,
 	scancode::t, // SDL_SCANCODE_T = 23,
 	scancode::u, // SDL_SCANCODE_U = 24,
 	scancode::v, // SDL_SCANCODE_V = 25,
 	scancode::w, // SDL_SCANCODE_W = 26,
 	scancode::x, // SDL_SCANCODE_X = 27,
 	scancode::y, // SDL_SCANCODE_Y = 28,
 	scancode::z, // SDL_SCANCODE_Z = 29,
 	scancode::one, // SDL_SCANCODE_1 = 30,
 	scancode::two, // SDL_SCANCODE_2 = 31,
 	scancode::three, // SDL_SCANCODE_3 = 32,
 	scancode::four, // SDL_SCANCODE_4 = 33,
 	scancode::five, // SDL_SCANCODE_5 = 34,
 	scancode::six, // SDL_SCANCODE_6 = 35,
 	scancode::seven, // SDL_SCANCODE_7 = 36,
 	scancode::eight, // SDL_SCANCODE_8 = 37,
 	scancode::nine, // SDL_SCANCODE_9 = 38,
 	scancode::zero, // SDL_SCANCODE_0 = 39,
 	scancode::enter, // SDL_SCANCODE_RETURN = 40,
 	scancode::escape, // SDL_SCANCODE_ESCAPE = 41,
 	scancode::backspace, // SDL_SCANCODE_BACKSPACE = 42,
 	scancode::tab, // SDL_SCANCODE_TAB = 43,
 	scancode::space, // SDL_SCANCODE_SPACE = 44,
 	scancode::minus, // SDL_SCANCODE_MINUS = 45,
 	scancode::equal, // SDL_SCANCODE_EQUALS = 46,
 	scancode::left_brace, // SDL_SCANCODE_LEFTBRACKET = 47,
 	scancode::right_brace, // SDL_SCANCODE_RIGHTBRACKET = 48,
 	scancode::backslash, // SDL_SCANCODE_BACKSLASH = 49,
 	scancode::non_us_hash, // SDL_SCANCODE_NONUSHASH = 50,
 	scancode::semicolon, // SDL_SCANCODE_SEMICOLON = 51,
 	scancode::apostrophe, // SDL_SCANCODE_APOSTROPHE = 52,
 	scancode::grave, // SDL_SCANCODE_GRAVE = 53,
 	scancode::comma, // SDL_SCANCODE_COMMA = 54,
 	scancode::dot, // SDL_SCANCODE_PERIOD = 55,
 	scancode::slash, // SDL_SCANCODE_SLASH = 56,
 	scancode::caps_lock, // SDL_SCANCODE_CAPSLOCK = 57,
 	scancode::f1, // SDL_SCANCODE_F1 = 58,
 	scancode::f2, // SDL_SCANCODE_F2 = 59,
 	scancode::f3, // SDL_SCANCODE_F3 = 60,
 	scancode::f4, // SDL_SCANCODE_F4 = 61,
 	scancode::f5, // SDL_SCANCODE_F5 = 62,
 	scancode::f6, // SDL_SCANCODE_F6 = 63,
 	scancode::f7, // SDL_SCANCODE_F7 = 64,
 	scancode::f8, // SDL_SCANCODE_F8 = 65,
 	scancode::f9, // SDL_SCANCODE_F9 = 66,
 	scancode::f10, // SDL_SCANCODE_F10 = 67,
 	scancode::f11, // SDL_SCANCODE_F11 = 68,
 	scancode::f12, // SDL_SCANCODE_F12 = 69,
 	scancode::print_screen, // SDL_SCANCODE_PRINTSCREEN = 70,
 	scancode::scroll_lock, // SDL_SCANCODE_SCROLLLOCK = 71,
 	scancode::pause, // SDL_SCANCODE_PAUSE = 72,
 	scancode::insert, // SDL_SCANCODE_INSERT = 73,
 	scancode::home, // SDL_SCANCODE_HOME = 74,
 	scancode::page_up, // SDL_SCANCODE_PAGEUP = 75,
 	scancode::del, // SDL_SCANCODE_DELETE = 76,
 	scancode::end, // SDL_SCANCODE_END = 77,
 	scancode::page_down, // SDL_SCANCODE_PAGEDOWN = 78,
 	scancode::right, // SDL_SCANCODE_RIGHT = 79,
 	scancode::left, // SDL_SCANCODE_LEFT = 80,
 	scancode::down, // SDL_SCANCODE_DOWN = 81,
 	scancode::up, // SDL_SCANCODE_UP = 82,
 	scancode::num_lock, // SDL_SCANCODE_NUMLOCKCLEAR = 83,
 	scancode::kp_slash, // SDL_SCANCODE_KP_DIVIDE = 84,
 	scancode::kp_asterisk, // SDL_SCANCODE_KP_MULTIPLY = 85,
 	scancode::kp_minus, // SDL_SCANCODE_KP_MINUS = 86,
 	scancode::kp_plus, // SDL_SCANCODE_KP_PLUS = 87,
 	scancode::kp_enter, // SDL_SCANCODE_KP_ENTER = 88,
 	scancode::kp_1, // SDL_SCANCODE_KP_1 = 89,
 	scancode::kp_2, // SDL_SCANCODE_KP_2 = 90,
 	scancode::kp_3, // SDL_SCANCODE_KP_3 = 91,
 	scancode::kp_4, // SDL_SCANCODE_KP_4 = 92,
 	scancode::kp_5, // SDL_SCANCODE_KP_5 = 93,
 	scancode::kp_6, // SDL_SCANCODE_KP_6 = 94,
 	scancode::kp_7, // SDL_SCANCODE_KP_7 = 95,
 	scancode::kp_8, // SDL_SCANCODE_KP_8 = 96,
 	scancode::kp_9, // SDL_SCANCODE_KP_9 = 97,
 	scancode::kp_0, // SDL_SCANCODE_KP_0 = 98,
 	scancode::kp_dot, // SDL_SCANCODE_KP_PERIOD = 99,
 	scancode::non_us_backslash, // SDL_SCANCODE_NONUSBACKSLASH = 100,
 	scancode::application, // SDL_SCANCODE_APPLICATION = 101,
 	scancode::power, // SDL_SCANCODE_POWER = 102,
 	scancode::kp_equal, // SDL_SCANCODE_KP_EQUALS = 103,
 	scancode::f13, // SDL_SCANCODE_F13 = 104,
 	scancode::f14, // SDL_SCANCODE_F14 = 105,
 	scancode::f15, // SDL_SCANCODE_F15 = 106,
 	scancode::f16, // SDL_SCANCODE_F16 = 107,
 	scancode::f17, // SDL_SCANCODE_F17 = 108,
 	scancode::f18, // SDL_SCANCODE_F18 = 109,
 	scancode::f19, // SDL_SCANCODE_F19 = 110,
 	scancode::f20, // SDL_SCANCODE_F20 = 111,
 	scancode::f21, // SDL_SCANCODE_F21 = 112,
 	scancode::f22, // SDL_SCANCODE_F22 = 113,
 	scancode::f23, // SDL_SCANCODE_F23 = 114,
 	scancode::f24, // SDL_SCANCODE_F24 = 115,
 	scancode::execute, // SDL_SCANCODE_EXECUTE = 116,
 	scancode::help, // SDL_SCANCODE_HELP = 117,
 	scancode::menu, // SDL_SCANCODE_MENU = 118,
 	scancode::select, // SDL_SCANCODE_SELECT = 119,
 	scancode::stop, // SDL_SCANCODE_STOP = 120,
 	scancode::again, // SDL_SCANCODE_AGAIN = 121,
 	scancode::undo, // SDL_SCANCODE_UNDO = 122,
 	scancode::cut, // SDL_SCANCODE_CUT = 123,
 	scancode::copy, // SDL_SCANCODE_COPY = 124,
 	scancode::paste, // SDL_SCANCODE_PASTE = 125,
 	scancode::find, // SDL_SCANCODE_FIND = 126,
 	scancode::mute, // SDL_SCANCODE_MUTE = 127,
 	scancode::volume_up, // SDL_SCANCODE_VOLUMEUP = 128,
 	scancode::volume_down, // SDL_SCANCODE_VOLUMEDOWN = 129,
 	scancode::locking_caps_lock, // Unassigned = 130
 	scancode::locking_num_lock, // Unassigned = 131
 	scancode::locking_scroll_lock, // Unassigned = 132
 	scancode::kp_comma, // SDL_SCANCODE_KP_COMMA = 133,
 	scancode::kp_equal_as400, // SDL_SCANCODE_KP_EQUALSAS400 = 134,
 	scancode::international_1, // SDL_SCANCODE_INTERNATIONAL1 = 135,
 	scancode::international_2, // SDL_SCANCODE_INTERNATIONAL2 = 136,
 	scancode::international_3, // SDL_SCANCODE_INTERNATIONAL3 = 137,
 	scancode::international_4, // SDL_SCANCODE_INTERNATIONAL4 = 138,
 	scancode::international_5, // SDL_SCANCODE_INTERNATIONAL5 = 139,
 	scancode::international_6, // SDL_SCANCODE_INTERNATIONAL6 = 140,
 	scancode::international_7, // SDL_SCANCODE_INTERNATIONAL7 = 141,
 	scancode::international_8, // SDL_SCANCODE_INTERNATIONAL8 = 142,
 	scancode::international_9, // SDL_SCANCODE_INTERNATIONAL9 = 143,
 	scancode::lang_1, // SDL_SCANCODE_LANG1 = 144,
 	scancode::lang_2, // SDL_SCANCODE_LANG2 = 145,
 	scancode::lang_3, // SDL_SCANCODE_LANG3 = 146,
 	scancode::lang_4, // SDL_SCANCODE_LANG4 = 147,
 	scancode::lang_5, // SDL_SCANCODE_LANG5 = 148,
 	scancode::lang_6, // SDL_SCANCODE_LANG6 = 149,
 	scancode::lang_7, // SDL_SCANCODE_LANG7 = 150,
 	scancode::lang_8, // SDL_SCANCODE_LANG8 = 151,
 	scancode::lang_9, // SDL_SCANCODE_LANG9 = 152,
 	scancode::alt_erase, // SDL_SCANCODE_ALTERASE = 153,
 	scancode::sys_req, // SDL_SCANCODE_SYSREQ = 154,
 	scancode::cancel, // SDL_SCANCODE_CANCEL = 155,
 	scancode::clear, // SDL_SCANCODE_CLEAR = 156,
 	scancode::prior, // SDL_SCANCODE_PRIOR = 157,
 	scancode::return_2, // SDL_SCANCODE_RETURN2 = 158,
 	scancode::separator, // SDL_SCANCODE_SEPARATOR = 159,
 	scancode::_out, // SDL_SCANCODE_OUT = 160,
 	scancode::oper, // SDL_SCANCODE_OPER = 161,
 	scancode::clear_again, // SDL_SCANCODE_CLEARAGAIN = 162,
 	scancode::cr_sel, // SDL_SCANCODE_CRSEL = 163,
 	scancode::ex_sel, // SDL_SCANCODE_EXSEL = 164,
 	scancode::unknown, // Unassigned = 165
 	scancode::unknown, // Unassigned = 166
 	scancode::unknown, // Unassigned = 167
 	scancode::unknown, // Unassigned = 168
 	scancode::unknown, // Unassigned = 169
 	scancode::unknown, // Unassigned = 170
 	scancode::unknown, // Unassigned = 171
 	scancode::unknown, // Unassigned = 172
 	scancode::unknown, // Unassigned = 173
 	scancode::unknown, // Unassigned = 174
 	scancode::unknown, // Unassigned = 175
 	scancode::kp_00, // SDL_SCANCODE_KP_00 = 176,
 	scancode::kp_000, // SDL_SCANCODE_KP_000 = 177,
 	scancode::thousands_separator, // SDL_SCANCODE_THOUSANDSSEPARATOR = 178,
 	scancode::decimal_separator, // SDL_SCANCODE_DECIMALSEPARATOR = 179,
 	scancode::currency_unit, // SDL_SCANCODE_CURRENCYUNIT = 180,
 	scancode::currency_sub_unit, // SDL_SCANCODE_CURRENCYSUBUNIT = 181,
 	scancode::kp_left_paren, // SDL_SCANCODE_KP_LEFTPAREN = 182,
 	scancode::kp_right_paren, // SDL_SCANCODE_KP_RIGHTPAREN = 183,
 	scancode::kp_left_brace, // SDL_SCANCODE_KP_LEFTBRACE = 184,
 	scancode::kp_right_brace, // SDL_SCANCODE_KP_RIGHTBRACE = 185,
 	scancode::kp_tab, // SDL_SCANCODE_KP_TAB = 186,
 	scancode::kp_backspace, // SDL_SCANCODE_KP_BACKSPACE = 187,
 	scancode::kp_a, // SDL_SCANCODE_KP_A = 188,
 	scancode::kp_b, // SDL_SCANCODE_KP_B = 189,
 	scancode::kp_c, // SDL_SCANCODE_KP_C = 190,
 	scancode::kp_d, // SDL_SCANCODE_KP_D = 191,
 	scancode::kp_e, // SDL_SCANCODE_KP_E = 192,
 	scancode::kp_f, // SDL_SCANCODE_KP_F = 193,
 	scancode::kp_xor, // SDL_SCANCODE_KP_XOR = 194,
 	scancode::kp_power, // SDL_SCANCODE_KP_POWER = 195,
 	scancode::kp_percent, // SDL_SCANCODE_KP_PERCENT = 196,
 	scancode::kp_less, // SDL_SCANCODE_KP_LESS = 197,
 	scancode::kp_greater, // SDL_SCANCODE_KP_GREATER = 198,
 	scancode::kp_ampersand, // SDL_SCANCODE_KP_AMPERSAND = 199,
 	scancode::kp_double_ampersand, // SDL_SCANCODE_KP_DBLAMPERSAND = 200,
 	scancode::kp_vertical_bar, // SDL_SCANCODE_KP_VERTICALBAR = 201,
 	scancode::kp_double_vertical_bar, // SDL_SCANCODE_KP_DBLVERTICALBAR = 202,
 	scancode::kp_colon, // SDL_SCANCODE_KP_COLON = 203,
 	scancode::kp_hash, // SDL_SCANCODE_KP_HASH = 204,
 	scancode::kp_space, // SDL_SCANCODE_KP_SPACE = 205,
 	scancode::kp_at, // SDL_SCANCODE_KP_AT = 206,
 	scancode::kp_exclam, // SDL_SCANCODE_KP_EXCLAM = 207,
 	scancode::kp_mem_store, // SDL_SCANCODE_KP_MEMSTORE = 208,
 	scancode::kp_mem_recall, // SDL_SCANCODE_KP_MEMRECALL = 209,
 	scancode::kp_mem_clear, // SDL_SCANCODE_KP_MEMCLEAR = 210,
 	scancode::kp_mem_add, // SDL_SCANCODE_KP_MEMADD = 211,
 	scancode::kp_mem_subtract, // SDL_SCANCODE_KP_MEMSUBTRACT = 212,
 	scancode::kp_mem_multiply, // SDL_SCANCODE_KP_MEMMULTIPLY = 213,
 	scancode::kp_mem_divide, // SDL_SCANCODE_KP_MEMDIVIDE = 214,
 	scancode::kp_plus_minus, // SDL_SCANCODE_KP_PLUSMINUS = 215,
 	scancode::kp_clear, // SDL_SCANCODE_KP_CLEAR = 216,
 	scancode::kp_clear_entry, // SDL_SCANCODE_KP_CLEARENTRY = 217,
 	scancode::kp_binary, // SDL_SCANCODE_KP_BINARY = 218,
 	scancode::kp_octal, // SDL_SCANCODE_KP_OCTAL = 219,
 	scancode::kp_decimal, // SDL_SCANCODE_KP_DECIMAL = 220,
 	scancode::kp_hexadecimal, // SDL_SCANCODE_KP_HEXADECIMAL = 221,
 	scancode::unknown, // Unassigned = 222
 	scancode::unknown, // Unassigned = 223
 	scancode::left_ctrl, // SDL_SCANCODE_LCTRL = 224,
 	scancode::left_shift, // SDL_SCANCODE_LSHIFT = 225,
 	scancode::left_alt, // SDL_SCANCODE_LALT = 226,
 	scancode::left_gui, // SDL_SCANCODE_LGUI = 227,
 	scancode::right_ctrl, // SDL_SCANCODE_RCTRL = 228,
 	scancode::right_shift, // SDL_SCANCODE_RSHIFT = 229,
 	scancode::right_alt, // SDL_SCANCODE_RALT = 230,
 	scancode::right_gui, // SDL_SCANCODE_RGUI = 231,
 	scancode::unknown, // Unassigned = 232
 	scancode::unknown, // Unassigned = 233
 	scancode::unknown, // Unassigned = 234
 	scancode::unknown, // Unassigned = 235
 	scancode::unknown, // Unassigned = 236
 	scancode::unknown, // Unassigned = 237
 	scancode::unknown, // Unassigned = 238
 	scancode::unknown, // Unassigned = 239
 	scancode::unknown, // Unassigned = 240
 	scancode::unknown, // Unassigned = 241
 	scancode::unknown, // Unassigned = 242
 	scancode::unknown, // Unassigned = 243
 	scancode::unknown, // Unassigned = 244
 	scancode::unknown, // Unassigned = 245
 	scancode::unknown, // Unassigned = 246
 	scancode::unknown, // Unassigned = 247
 	scancode::unknown, // Unassigned = 248
 	scancode::unknown, // Unassigned = 249
 	scancode::unknown, // Unassigned = 250
 	scancode::unknown, // Unassigned = 251
 	scancode::unknown, // Unassigned = 252
 	scancode::unknown, // Unassigned = 253
 	scancode::unknown, // Unassigned = 254
 	scancode::unknown, // Unassigned = 255
 	scancode::unknown, // Unassigned = 256
 	scancode::mode, // SDL_SCANCODE_MODE = 257,
 	scancode::audio_next, // SDL_SCANCODE_AUDIONEXT = 258,
 	scancode::audio_prev, // SDL_SCANCODE_AUDIOPREV = 259,
 	scancode::audio_stop, // SDL_SCANCODE_AUDIOSTOP = 260,
 	scancode::audio_play, // SDL_SCANCODE_AUDIOPLAY = 261,
 	scancode::audio_mute, // SDL_SCANCODE_AUDIOMUTE = 262,
 	scancode::media_select, // SDL_SCANCODE_MEDIASELECT = 263,
 	scancode::www, // SDL_SCANCODE_WWW = 264,
 	scancode::mail, // SDL_SCANCODE_MAIL = 265,
 	scancode::calculator, // SDL_SCANCODE_CALCULATOR = 266,
 	scancode::computer, // SDL_SCANCODE_COMPUTER = 267,
 	scancode::ac_search, // SDL_SCANCODE_AC_SEARCH = 268,
 	scancode::ac_home, // SDL_SCANCODE_AC_HOME = 269,
 	scancode::ac_back, // SDL_SCANCODE_AC_BACK = 270,
 	scancode::ac_forward, // SDL_SCANCODE_AC_FORWARD = 271,
 	scancode::ac_stop, // SDL_SCANCODE_AC_STOP = 272,
 	scancode::ac_refresh, // SDL_SCANCODE_AC_REFRESH = 273,
 	scancode::ac_bookmarks, // SDL_SCANCODE_AC_BOOKMARKS = 274,
 	scancode::brightness_down, // SDL_SCANCODE_BRIGHTNESSDOWN = 275,
 	scancode::brightness_up, // SDL_SCANCODE_BRIGHTNESSUP = 276,
 	scancode::display_switch, // SDL_SCANCODE_DISPLAYSWITCH = 277,
 	scancode::kbd_illum_toggle, // SDL_SCANCODE_KBDILLUMTOGGLE = 278,
 	scancode::kbd_illum_down, // SDL_SCANCODE_KBDILLUMDOWN = 279,
 	scancode::kbd_illum_up, // SDL_SCANCODE_KBDILLUMUP = 280,
 	scancode::eject, // SDL_SCANCODE_EJECT = 281,
 	scancode::sleep, // SDL_SCANCODE_SLEEP = 282,
 	scancode::app_1, // SDL_SCANCODE_APP1 = 283,
 	scancode::app_2, // SDL_SCANCODE_APP2 = 284,
 	scancode::audio_rewind, // SDL_SCANCODE_AUDIOREWIND = 285,
 	scancode::audio_fast_forward, // SDL_SCANCODE_AUDIOFASTFORWARD = 286,
 };

--- a/src/antkeeper/input/sdl-scancode-table.hpp
+++ b/src/antkeeper/input/sdl-scancode-table.hpp
@ -0,0 +1,28 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_SDL_SCANCODE_TABLE_HPP
 #define ANTKEEPER_SDL_SCANCODE_TABLE_HPP

 enum class scancode;

 extern const scancode sdl_scancode_table[287];

 #endif // ANTKEEPER_SDL_SCANCODE_TABLE_HPP

--- a/src/antkeeper/main.cpp
+++ b/src/antkeeper/main.cpp
@ -1,35 +1,37 @@
 /*
 * Copyright (C) 2017-2019  Christopher J. Howard
 *
 * This file is part of Antkeeper Source Code.
 *
 * Antkeeper Source Code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper Source Code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper Source Code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "game.hpp"

 int main(int argc, char* argv[])
 {
 	try
 	{
 		return Game(argc, argv).execute();
 	}
 	catch (const std::exception& e)
 	{
 		std::cerr << "Exception caught: \"" << e.what() << "\"" << std::endl;
 	}

 	return EXIT_FAILURE;
 }

 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "application.hpp"
 #include <iostream>
 #include <stdexcept>

 int main(int argc, char* argv[])
 {
 	try
 	{
 		return application(argc, argv).execute();
 	}
 	catch (const std::exception& e)
 	{
 		std::cerr << "Exception caught: \"" << e.what() << "\"" << std::endl;
 	}

 	return EXIT_FAILURE;
 }

--- a/src/antkeeper/marching-cubes.cpp
+++ b/src/antkeeper/marching-cubes.cpp
@ -0,0 +1,417 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "marching-cubes.hpp"
 #include <cmath>

 namespace mc {

 static constexpr std::uint_fast8_t vertex_table[12][2] =
 {
 	{0, 1},
 	{1, 2},
 	{2, 3},
 	{3, 0},
 	{4, 5},
 	{5, 6},
 	{6, 7},
 	{7, 4},
 	{0, 4},
 	{1, 5},
 	{2, 6},
 	{3, 7}
 };

 static constexpr std::uint_fast16_t edge_table[256] =
 {
 	0x000, 0x109, 0x203, 0x30a, 0x406, 0x50f, 0x605, 0x70c,
 	0x80c, 0x905, 0xa0f, 0xb06, 0xc0a, 0xd03, 0xe09, 0xf00,
 	0x190, 0x099, 0x393, 0x29a, 0x596, 0x49f, 0x795, 0x69c,
 	0x99c, 0x895, 0xb9f, 0xa96, 0xd9a, 0xc93, 0xf99, 0xe90,
 	0x230, 0x339, 0x033, 0x13a, 0x636, 0x73f, 0x435, 0x53c,
 	0xa3c, 0xb35, 0x83f, 0x936, 0xe3a, 0xf33, 0xc39, 0xd30,
 	0x3a0, 0x2a9, 0x1a3, 0x0aa, 0x7a6, 0x6af, 0x5a5, 0x4ac,
 	0xbac, 0xaa5, 0x9af, 0x8a6, 0xfaa, 0xea3, 0xda9, 0xca0,
 	0x460, 0x569, 0x663, 0x76a, 0x066, 0x16f, 0x265, 0x36c,
 	0xc6c, 0xd65, 0xe6f, 0xf66, 0x86a, 0x963, 0xa69, 0xb60,
 	0x5f0, 0x4f9, 0x7f3, 0x6fa, 0x1f6, 0x0ff, 0x3f5, 0x2fc,
 	0xdfc, 0xcf5, 0xfff, 0xef6, 0x9fa, 0x8f3, 0xbf9, 0xaf0,
 	0x650, 0x759, 0x453, 0x55a, 0x256, 0x35f, 0x055, 0x15c,
 	0xe5c, 0xf55, 0xc5f, 0xd56, 0xa5a, 0xb53, 0x859, 0x950,
 	0x7c0, 0x6c9, 0x5c3, 0x4ca, 0x3c6, 0x2cf, 0x1c5, 0x0cc,
 	0xfcc, 0xec5, 0xdcf, 0xcc6, 0xbca, 0xac3, 0x9c9, 0x8c0,
 	0x8c0, 0x9c9, 0xac3, 0xbca, 0xcc6, 0xdcf, 0xec5, 0xfcc,
 	0x0cc, 0x1c5, 0x2cf, 0x3c6, 0x4ca, 0x5c3, 0x6c9, 0x7c0,
 	0x950, 0x859, 0xb53, 0xa5a, 0xd56, 0xc5f, 0xf55, 0xe5c,
 	0x15c, 0x055, 0x35f, 0x256, 0x55a, 0x453, 0x759, 0x650,
 	0xaf0, 0xbf9, 0x8f3, 0x9fa, 0xef6, 0xfff, 0xcf5, 0xdfc,
 	0x2fc, 0x3f5, 0x0ff, 0x1f6, 0x6fa, 0x7f3, 0x4f9, 0x5f0,
 	0xb60, 0xa69, 0x963, 0x86a, 0xf66, 0xe6f, 0xd65, 0xc6c,
 	0x36c, 0x265, 0x16f, 0x066, 0x76a, 0x663, 0x569, 0x460,
 	0xca0, 0xda9, 0xea3, 0xfaa, 0x8a6, 0x9af, 0xaa5, 0xbac,
 	0x4ac, 0x5a5, 0x6af, 0x7a6, 0x0aa, 0x1a3, 0x2a9, 0x3a0,
 	0xd30, 0xc39, 0xf33, 0xe3a, 0x936, 0x83f, 0xb35, 0xa3c,
 	0x53c, 0x435, 0x73f, 0x636, 0x13a, 0x033, 0x339, 0x230,
 	0xe90, 0xf99, 0xc93, 0xd9a, 0xa96, 0xb9f, 0x895, 0x99c,
 	0x69c, 0x795, 0x49f, 0x596, 0x29a, 0x393, 0x099, 0x190,
 	0xf00, 0xe09, 0xd03, 0xc0a, 0xb06, 0xa0f, 0x905, 0x80c,
 	0x70c, 0x605, 0x50f, 0x406, 0x30a, 0x203, 0x109, 0x000
 };

 static constexpr std::int_fast8_t triangle_table[256][16] =
 {
 	{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 1, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 8, 3, 9, 8, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 2, 10, 0, 2, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{2, 8, 3, 2, 10, 8, 10, 9, 8, -1, -1, -1, -1, -1, -1, -1},
 	{3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 11, 2, 8, 11, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 9, 0, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 11, 2, 1, 9, 11, 9, 8, 11, -1, -1, -1, -1, -1, -1, -1},
 	{3, 10, 1, 11, 10, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 10, 1, 0, 8, 10, 8, 11, 10, -1, -1, -1, -1, -1, -1, -1},
 	{3, 9, 0, 3, 11, 9, 11, 10, 9, -1, -1, -1, -1, -1, -1, -1},
 	{9, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 3, 0, 7, 3, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 1, 9, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 1, 9, 4, 7, 1, 7, 3, 1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 4, 7, 3, 0, 4, 1, 2, 10, -1, -1, -1, -1, -1, -1, -1},
 	{9, 2, 10, 9, 0, 2, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
 	{2, 10, 9, 2, 9, 7, 2, 7, 3, 7, 9, 4, -1, -1, -1, -1},
 	{8, 4, 7, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{11, 4, 7, 11, 2, 4, 2, 0, 4, -1, -1, -1, -1, -1, -1, -1},
 	{9, 0, 1, 8, 4, 7, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
 	{4, 7, 11, 9, 4, 11, 9, 11, 2, 9, 2, 1, -1, -1, -1, -1},
 	{3, 10, 1, 3, 11, 10, 7, 8, 4, -1, -1, -1, -1, -1, -1, -1},
 	{1, 11, 10, 1, 4, 11, 1, 0, 4, 7, 11, 4, -1, -1, -1, -1},
 	{4, 7, 8, 9, 0, 11, 9, 11, 10, 11, 0, 3, -1, -1, -1, -1},
 	{4, 7, 11, 4, 11, 9, 9, 11, 10, -1, -1, -1, -1, -1, -1, -1},
 	{9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 5, 4, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 5, 4, 1, 5, 0, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{8, 5, 4, 8, 3, 5, 3, 1, 5, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 0, 8, 1, 2, 10, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
 	{5, 2, 10, 5, 4, 2, 4, 0, 2, -1, -1, -1, -1, -1, -1, -1},
 	{2, 10, 5, 3, 2, 5, 3, 5, 4, 3, 4, 8, -1, -1, -1, -1},
 	{9, 5, 4, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 11, 2, 0, 8, 11, 4, 9, 5, -1, -1, -1, -1, -1, -1, -1},
 	{0, 5, 4, 0, 1, 5, 2, 3, 11, -1, -1, -1, -1, -1, -1, -1},
 	{2, 1, 5, 2, 5, 8, 2, 8, 11, 4, 8, 5, -1, -1, -1, -1},
 	{10, 3, 11, 10, 1, 3, 9, 5, 4, -1, -1, -1, -1, -1, -1, -1},
 	{4, 9, 5, 0, 8, 1, 8, 10, 1, 8, 11, 10, -1, -1, -1, -1},
 	{5, 4, 0, 5, 0, 11, 5, 11, 10, 11, 0, 3, -1, -1, -1, -1},
 	{5, 4, 8, 5, 8, 10, 10, 8, 11, -1, -1, -1, -1, -1, -1, -1},
 	{9, 7, 8, 5, 7, 9, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 3, 0, 9, 5, 3, 5, 7, 3, -1, -1, -1, -1, -1, -1, -1},
 	{0, 7, 8, 0, 1, 7, 1, 5, 7, -1, -1, -1, -1, -1, -1, -1},
 	{1, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 7, 8, 9, 5, 7, 10, 1, 2, -1, -1, -1, -1, -1, -1, -1},
 	{10, 1, 2, 9, 5, 0, 5, 3, 0, 5, 7, 3, -1, -1, -1, -1},
 	{8, 0, 2, 8, 2, 5, 8, 5, 7, 10, 5, 2, -1, -1, -1, -1},
 	{2, 10, 5, 2, 5, 3, 3, 5, 7, -1, -1, -1, -1, -1, -1, -1},
 	{7, 9, 5, 7, 8, 9, 3, 11, 2, -1, -1, -1, -1, -1, -1, -1},
 	{9, 5, 7, 9, 7, 2, 9, 2, 0, 2, 7, 11, -1, -1, -1, -1},
 	{2, 3, 11, 0, 1, 8, 1, 7, 8, 1, 5, 7, -1, -1, -1, -1},
 	{11, 2, 1, 11, 1, 7, 7, 1, 5, -1, -1, -1, -1, -1, -1, -1},
 	{9, 5, 8, 8, 5, 7, 10, 1, 3, 10, 3, 11, -1, -1, -1, -1},
 	{5, 7, 0, 5, 0, 9, 7, 11, 0, 1, 0, 10, 11, 10, 0, -1},
 	{11, 10, 0, 11, 0, 3, 10, 5, 0, 8, 0, 7, 5, 7, 0, -1},
 	{11, 10, 5, 7, 11, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 0, 1, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 8, 3, 1, 9, 8, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
 	{1, 6, 5, 2, 6, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 6, 5, 1, 2, 6, 3, 0, 8, -1, -1, -1, -1, -1, -1, -1},
 	{9, 6, 5, 9, 0, 6, 0, 2, 6, -1, -1, -1, -1, -1, -1, -1},
 	{5, 9, 8, 5, 8, 2, 5, 2, 6, 3, 2, 8, -1, -1, -1, -1},
 	{2, 3, 11, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{11, 0, 8, 11, 2, 0, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
 	{0, 1, 9, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1, -1, -1, -1},
 	{5, 10, 6, 1, 9, 2, 9, 11, 2, 9, 8, 11, -1, -1, -1, -1},
 	{6, 3, 11, 6, 5, 3, 5, 1, 3, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 11, 0, 11, 5, 0, 5, 1, 5, 11, 6, -1, -1, -1, -1},
 	{3, 11, 6, 0, 3, 6, 0, 6, 5, 0, 5, 9, -1, -1, -1, -1},
 	{6, 5, 9, 6, 9, 11, 11, 9, 8, -1, -1, -1, -1, -1, -1, -1},
 	{5, 10, 6, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 3, 0, 4, 7, 3, 6, 5, 10, -1, -1, -1, -1, -1, -1, -1},
 	{1, 9, 0, 5, 10, 6, 8, 4, 7, -1, -1, -1, -1, -1, -1, -1},
 	{10, 6, 5, 1, 9, 7, 1, 7, 3, 7, 9, 4, -1, -1, -1, -1},
 	{6, 1, 2, 6, 5, 1, 4, 7, 8, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 5, 5, 2, 6, 3, 0, 4, 3, 4, 7, -1, -1, -1, -1},
 	{8, 4, 7, 9, 0, 5, 0, 6, 5, 0, 2, 6, -1, -1, -1, -1},
 	{7, 3, 9, 7, 9, 4, 3, 2, 9, 5, 9, 6, 2, 6, 9, -1},
 	{3, 11, 2, 7, 8, 4, 10, 6, 5, -1, -1, -1, -1, -1, -1, -1},
 	{5, 10, 6, 4, 7, 2, 4, 2, 0, 2, 7, 11, -1, -1, -1, -1},
 	{0, 1, 9, 4, 7, 8, 2, 3, 11, 5, 10, 6, -1, -1, -1, -1},
 	{9, 2, 1, 9, 11, 2, 9, 4, 11, 7, 11, 4, 5, 10, 6, -1},
 	{8, 4, 7, 3, 11, 5, 3, 5, 1, 5, 11, 6, -1, -1, -1, -1},
 	{5, 1, 11, 5, 11, 6, 1, 0, 11, 7, 11, 4, 0, 4, 11, -1},
 	{0, 5, 9, 0, 6, 5, 0, 3, 6, 11, 6, 3, 8, 4, 7, -1},
 	{6, 5, 9, 6, 9, 11, 4, 7, 9, 7, 11, 9, -1, -1, -1, -1},
 	{10, 4, 9, 6, 4, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 10, 6, 4, 9, 10, 0, 8, 3, -1, -1, -1, -1, -1, -1, -1},
 	{10, 0, 1, 10, 6, 0, 6, 4, 0, -1, -1, -1, -1, -1, -1, -1},
 	{8, 3, 1, 8, 1, 6, 8, 6, 4, 6, 1, 10, -1, -1, -1, -1},
 	{1, 4, 9, 1, 2, 4, 2, 6, 4, -1, -1, -1, -1, -1, -1, -1},
 	{3, 0, 8, 1, 2, 9, 2, 4, 9, 2, 6, 4, -1, -1, -1, -1},
 	{0, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{8, 3, 2, 8, 2, 4, 4, 2, 6, -1, -1, -1, -1, -1, -1, -1},
 	{10, 4, 9, 10, 6, 4, 11, 2, 3, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 2, 2, 8, 11, 4, 9, 10, 4, 10, 6, -1, -1, -1, -1},
 	{3, 11, 2, 0, 1, 6, 0, 6, 4, 6, 1, 10, -1, -1, -1, -1},
 	{6, 4, 1, 6, 1, 10, 4, 8, 1, 2, 1, 11, 8, 11, 1, -1},
 	{9, 6, 4, 9, 3, 6, 9, 1, 3, 11, 6, 3, -1, -1, -1, -1},
 	{8, 11, 1, 8, 1, 0, 11, 6, 1, 9, 1, 4, 6, 4, 1, -1},
 	{3, 11, 6, 3, 6, 0, 0, 6, 4, -1, -1, -1, -1, -1, -1, -1},
 	{6, 4, 8, 11, 6, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{7, 10, 6, 7, 8, 10, 8, 9, 10, -1, -1, -1, -1, -1, -1, -1},
 	{0, 7, 3, 0, 10, 7, 0, 9, 10, 6, 7, 10, -1, -1, -1, -1},
 	{10, 6, 7, 1, 10, 7, 1, 7, 8, 1, 8, 0, -1, -1, -1, -1},
 	{10, 6, 7, 10, 7, 1, 1, 7, 3, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 6, 1, 6, 8, 1, 8, 9, 8, 6, 7, -1, -1, -1, -1},
 	{2, 6, 9, 2, 9, 1, 6, 7, 9, 0, 9, 3, 7, 3, 9, -1},
 	{7, 8, 0, 7, 0, 6, 6, 0, 2, -1, -1, -1, -1, -1, -1, -1},
 	{7, 3, 2, 6, 7, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{2, 3, 11, 10, 6, 8, 10, 8, 9, 8, 6, 7, -1, -1, -1, -1},
 	{2, 0, 7, 2, 7, 11, 0, 9, 7, 6, 7, 10, 9, 10, 7, -1},
 	{1, 8, 0, 1, 7, 8, 1, 10, 7, 6, 7, 10, 2, 3, 11, -1},
 	{11, 2, 1, 11, 1, 7, 10, 6, 1, 6, 7, 1, -1, -1, -1, -1},
 	{8, 9, 6, 8, 6, 7, 9, 1, 6, 11, 6, 3, 1, 3, 6, -1},
 	{0, 9, 1, 11, 6, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{7, 8, 0, 7, 0, 6, 3, 11, 0, 11, 6, 0, -1, -1, -1, -1},
 	{7, 11, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 0, 8, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 1, 9, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{8, 1, 9, 8, 3, 1, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
 	{10, 1, 2, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, 3, 0, 8, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
 	{2, 9, 0, 2, 10, 9, 6, 11, 7, -1, -1, -1, -1, -1, -1, -1},
 	{6, 11, 7, 2, 10, 3, 10, 8, 3, 10, 9, 8, -1, -1, -1, -1},
 	{7, 2, 3, 6, 2, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{7, 0, 8, 7, 6, 0, 6, 2, 0, -1, -1, -1, -1, -1, -1, -1},
 	{2, 7, 6, 2, 3, 7, 0, 1, 9, -1, -1, -1, -1, -1, -1, -1},
 	{1, 6, 2, 1, 8, 6, 1, 9, 8, 8, 7, 6, -1, -1, -1, -1},
 	{10, 7, 6, 10, 1, 7, 1, 3, 7, -1, -1, -1, -1, -1, -1, -1},
 	{10, 7, 6, 1, 7, 10, 1, 8, 7, 1, 0, 8, -1, -1, -1, -1},
 	{0, 3, 7, 0, 7, 10, 0, 10, 9, 6, 10, 7, -1, -1, -1, -1},
 	{7, 6, 10, 7, 10, 8, 8, 10, 9, -1, -1, -1, -1, -1, -1, -1},
 	{6, 8, 4, 11, 8, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 6, 11, 3, 0, 6, 0, 4, 6, -1, -1, -1, -1, -1, -1, -1},
 	{8, 6, 11, 8, 4, 6, 9, 0, 1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 4, 6, 9, 6, 3, 9, 3, 1, 11, 3, 6, -1, -1, -1, -1},
 	{6, 8, 4, 6, 11, 8, 2, 10, 1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, 3, 0, 11, 0, 6, 11, 0, 4, 6, -1, -1, -1, -1},
 	{4, 11, 8, 4, 6, 11, 0, 2, 9, 2, 10, 9, -1, -1, -1, -1},
 	{10, 9, 3, 10, 3, 2, 9, 4, 3, 11, 3, 6, 4, 6, 3, -1},
 	{8, 2, 3, 8, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1},
 	{0, 4, 2, 4, 6, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 9, 0, 2, 3, 4, 2, 4, 6, 4, 3, 8, -1, -1, -1, -1},
 	{1, 9, 4, 1, 4, 2, 2, 4, 6, -1, -1, -1, -1, -1, -1, -1},
 	{8, 1, 3, 8, 6, 1, 8, 4, 6, 6, 10, 1, -1, -1, -1, -1},
 	{10, 1, 0, 10, 0, 6, 6, 0, 4, -1, -1, -1, -1, -1, -1, -1},
 	{4, 6, 3, 4, 3, 8, 6, 10, 3, 0, 3, 9, 10, 9, 3, -1},
 	{10, 9, 4, 6, 10, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 9, 5, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, 4, 9, 5, 11, 7, 6, -1, -1, -1, -1, -1, -1, -1},
 	{5, 0, 1, 5, 4, 0, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
 	{11, 7, 6, 8, 3, 4, 3, 5, 4, 3, 1, 5, -1, -1, -1, -1},
 	{9, 5, 4, 10, 1, 2, 7, 6, 11, -1, -1, -1, -1, -1, -1, -1},
 	{6, 11, 7, 1, 2, 10, 0, 8, 3, 4, 9, 5, -1, -1, -1, -1},
 	{7, 6, 11, 5, 4, 10, 4, 2, 10, 4, 0, 2, -1, -1, -1, -1},
 	{3, 4, 8, 3, 5, 4, 3, 2, 5, 10, 5, 2, 11, 7, 6, -1},
 	{7, 2, 3, 7, 6, 2, 5, 4, 9, -1, -1, -1, -1, -1, -1, -1},
 	{9, 5, 4, 0, 8, 6, 0, 6, 2, 6, 8, 7, -1, -1, -1, -1},
 	{3, 6, 2, 3, 7, 6, 1, 5, 0, 5, 4, 0, -1, -1, -1, -1},
 	{6, 2, 8, 6, 8, 7, 2, 1, 8, 4, 8, 5, 1, 5, 8, -1},
 	{9, 5, 4, 10, 1, 6, 1, 7, 6, 1, 3, 7, -1, -1, -1, -1},
 	{1, 6, 10, 1, 7, 6, 1, 0, 7, 8, 7, 0, 9, 5, 4, -1},
 	{4, 0, 10, 4, 10, 5, 0, 3, 10, 6, 10, 7, 3, 7, 10, -1},
 	{7, 6, 10, 7, 10, 8, 5, 4, 10, 4, 8, 10, -1, -1, -1, -1},
 	{6, 9, 5, 6, 11, 9, 11, 8, 9, -1, -1, -1, -1, -1, -1, -1},
 	{3, 6, 11, 0, 6, 3, 0, 5, 6, 0, 9, 5, -1, -1, -1, -1},
 	{0, 11, 8, 0, 5, 11, 0, 1, 5, 5, 6, 11, -1, -1, -1, -1},
 	{6, 11, 3, 6, 3, 5, 5, 3, 1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 10, 9, 5, 11, 9, 11, 8, 11, 5, 6, -1, -1, -1, -1},
 	{0, 11, 3, 0, 6, 11, 0, 9, 6, 5, 6, 9, 1, 2, 10, -1},
 	{11, 8, 5, 11, 5, 6, 8, 0, 5, 10, 5, 2, 0, 2, 5, -1},
 	{6, 11, 3, 6, 3, 5, 2, 10, 3, 10, 5, 3, -1, -1, -1, -1},
 	{5, 8, 9, 5, 2, 8, 5, 6, 2, 3, 8, 2, -1, -1, -1, -1},
 	{9, 5, 6, 9, 6, 0, 0, 6, 2, -1, -1, -1, -1, -1, -1, -1},
 	{1, 5, 8, 1, 8, 0, 5, 6, 8, 3, 8, 2, 6, 2, 8, -1},
 	{1, 5, 6, 2, 1, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 3, 6, 1, 6, 10, 3, 8, 6, 5, 6, 9, 8, 9, 6, -1},
 	{10, 1, 0, 10, 0, 6, 9, 5, 0, 5, 6, 0, -1, -1, -1, -1},
 	{0, 3, 8, 5, 6, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{10, 5, 6, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{11, 5, 10, 7, 5, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{11, 5, 10, 11, 7, 5, 8, 3, 0, -1, -1, -1, -1, -1, -1, -1},
 	{5, 11, 7, 5, 10, 11, 1, 9, 0, -1, -1, -1, -1, -1, -1, -1},
 	{10, 7, 5, 10, 11, 7, 9, 8, 1, 8, 3, 1, -1, -1, -1, -1},
 	{11, 1, 2, 11, 7, 1, 7, 5, 1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, 1, 2, 7, 1, 7, 5, 7, 2, 11, -1, -1, -1, -1},
 	{9, 7, 5, 9, 2, 7, 9, 0, 2, 2, 11, 7, -1, -1, -1, -1},
 	{7, 5, 2, 7, 2, 11, 5, 9, 2, 3, 2, 8, 9, 8, 2, -1},
 	{2, 5, 10, 2, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1},
 	{8, 2, 0, 8, 5, 2, 8, 7, 5, 10, 2, 5, -1, -1, -1, -1},
 	{9, 0, 1, 5, 10, 3, 5, 3, 7, 3, 10, 2, -1, -1, -1, -1},
 	{9, 8, 2, 9, 2, 1, 8, 7, 2, 10, 2, 5, 7, 5, 2, -1},
 	{1, 3, 5, 3, 7, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 7, 0, 7, 1, 1, 7, 5, -1, -1, -1, -1, -1, -1, -1},
 	{9, 0, 3, 9, 3, 5, 5, 3, 7, -1, -1, -1, -1, -1, -1, -1},
 	{9, 8, 7, 5, 9, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{5, 8, 4, 5, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1},
 	{5, 0, 4, 5, 11, 0, 5, 10, 11, 11, 3, 0, -1, -1, -1, -1},
 	{0, 1, 9, 8, 4, 10, 8, 10, 11, 10, 4, 5, -1, -1, -1, -1},
 	{10, 11, 4, 10, 4, 5, 11, 3, 4, 9, 4, 1, 3, 1, 4, -1},
 	{2, 5, 1, 2, 8, 5, 2, 11, 8, 4, 5, 8, -1, -1, -1, -1},
 	{0, 4, 11, 0, 11, 3, 4, 5, 11, 2, 11, 1, 5, 1, 11, -1},
 	{0, 2, 5, 0, 5, 9, 2, 11, 5, 4, 5, 8, 11, 8, 5, -1},
 	{9, 4, 5, 2, 11, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{2, 5, 10, 3, 5, 2, 3, 4, 5, 3, 8, 4, -1, -1, -1, -1},
 	{5, 10, 2, 5, 2, 4, 4, 2, 0, -1, -1, -1, -1, -1, -1, -1},
 	{3, 10, 2, 3, 5, 10, 3, 8, 5, 4, 5, 8, 0, 1, 9, -1},
 	{5, 10, 2, 5, 2, 4, 1, 9, 2, 9, 4, 2, -1, -1, -1, -1},
 	{8, 4, 5, 8, 5, 3, 3, 5, 1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 4, 5, 1, 0, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{8, 4, 5, 8, 5, 3, 9, 0, 5, 0, 3, 5, -1, -1, -1, -1},
 	{9, 4, 5, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 11, 7, 4, 9, 11, 9, 10, 11, -1, -1, -1, -1, -1, -1, -1},
 	{0, 8, 3, 4, 9, 7, 9, 11, 7, 9, 10, 11, -1, -1, -1, -1},
 	{1, 10, 11, 1, 11, 4, 1, 4, 0, 7, 4, 11, -1, -1, -1, -1},
 	{3, 1, 4, 3, 4, 8, 1, 10, 4, 7, 4, 11, 10, 11, 4, -1},
 	{4, 11, 7, 9, 11, 4, 9, 2, 11, 9, 1, 2, -1, -1, -1, -1},
 	{9, 7, 4, 9, 11, 7, 9, 1, 11, 2, 11, 1, 0, 8, 3, -1},
 	{11, 7, 4, 11, 4, 2, 2, 4, 0, -1, -1, -1, -1, -1, -1, -1},
 	{11, 7, 4, 11, 4, 2, 8, 3, 4, 3, 2, 4, -1, -1, -1, -1},
 	{2, 9, 10, 2, 7, 9, 2, 3, 7, 7, 4, 9, -1, -1, -1, -1},
 	{9, 10, 7, 9, 7, 4, 10, 2, 7, 8, 7, 0, 2, 0, 7, -1},
 	{3, 7, 10, 3, 10, 2, 7, 4, 10, 1, 10, 0, 4, 0, 10, -1},
 	{1, 10, 2, 8, 7, 4, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 9, 1, 4, 1, 7, 7, 1, 3, -1, -1, -1, -1, -1, -1, -1},
 	{4, 9, 1, 4, 1, 7, 0, 8, 1, 8, 7, 1, -1, -1, -1, -1},
 	{4, 0, 3, 7, 4, 3, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{4, 8, 7, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{9, 10, 8, 10, 11, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 0, 9, 3, 9, 11, 11, 9, 10, -1, -1, -1, -1, -1, -1, -1},
 	{0, 1, 10, 0, 10, 8, 8, 10, 11, -1, -1, -1, -1, -1, -1, -1},
 	{3, 1, 10, 11, 3, 10, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 2, 11, 1, 11, 9, 9, 11, 8, -1, -1, -1, -1, -1, -1, -1},
 	{3, 0, 9, 3, 9, 11, 1, 2, 9, 2, 11, 9, -1, -1, -1, -1},
 	{0, 2, 11, 8, 0, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{3, 2, 11, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{2, 3, 8, 2, 8, 10, 10, 8, 9, -1, -1, -1, -1, -1, -1, -1},
 	{9, 10, 2, 0, 9, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{2, 3, 8, 2, 8, 10, 0, 1, 8, 1, 10, 8, -1, -1, -1, -1},
 	{1, 10, 2, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{1, 3, 8, 9, 1, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 9, 1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{0, 3, 8, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1},
 	{-1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1, -1}
 };

 void polygonize(float* vertices, std::uint_fast8_t* vertex_count, std::int_fast8_t* triangles, std::uint_fast8_t* triangle_count, const float* corners, const float* distances)
 {
 	*vertex_count = 0;
 	*triangle_count = 0;

 	// Calculate signed distances for each cube corner and form an edge table index.
 	std::uint_fast8_t edge_index = 0;
 	for (std::uint_fast8_t i = 0; i < 8; ++i)
 		edge_index |= (distances[i] < 0.0f) ? (1 << i) : 0;
 	
 	// Get edge flags from edge table
 	const std::uint_fast16_t edge_flags = edge_table[edge_index];
 	if (!edge_flags)
 		return;
 	
 	// Get vertex indices of the case
 	const std::int_fast8_t* indices = triangle_table[edge_index];
 	
 	// Calculate vertices and store in vertex buffer
 	float vertex_buffer[12 * 3];
 	for (std::uint_fast16_t i = 0; i < 12; ++i)
 	{
 		// If this edge is intersected
 		if (edge_flags & (1 << i))
 		{
 			// Find the two vertices which make up edge ab
 			std::uint_fast8_t a = vertex_table[i][0];
 			std::uint_fast8_t b = vertex_table[i][1];
 			const float* v_a = corners + a * 3;
 			const float* v_b = corners + b * 3;
 			float f_a = distances[a];
 			float f_b = distances[b];

 			// Determine interpolation ratio
 			static const float epsilon = 0.00001f;
 			float t;
 			if (std::fabs(f_a) < epsilon)
 				t = 1.0f;
 			else if (std::fabs(f_b) < epsilon)
 				t = 0.0f;
 			else if (std::fabs(f_b - f_a) < epsilon)
 				t = 0.5f; // Paul Bourke suggested this be 1.0f? Why?
 			else
 				t = (-f_a) / (f_b - f_a);	

 			// Interpolate between vertices
 			float* v = vertex_buffer + i * 3;
 			v[0] = v_a[0] + t * (v_b[0] - v_a[0]);
 			v[1] = v_a[1] + t * (v_b[1] - v_a[1]);
 			v[2] = v_a[2] + t * (v_b[2] - v_a[2]);
 		}
 	}

 	// Remap vertex buffer to be stored contiguously
 	std::int_fast8_t vertex_remap[12];
 	for (std::uint_fast8_t i = 0; i < 12; ++i)
 		vertex_remap[i] = -1;
 	for (std::uint_fast8_t i = 0; indices[i] != -1; ++i)
 	{
 		if (vertex_remap[indices[i]] == -1)
 		{
 			std::int_fast8_t index = indices[i] * 3;
 			*(vertices++) = vertex_buffer[  index];
 			*(vertices++) = vertex_buffer[++index];
 			*(vertices++) = vertex_buffer[++index];
 			vertex_remap[indices[i]] = (*vertex_count)++;
 		}
 	}
 	
 	// Form triangles
 	for (std::uint_fast8_t i = 0; indices[i] != -1;)
 	{
 		*(triangles++) = vertex_remap[indices[i++]];
 		*(triangles++) = vertex_remap[indices[i++]];
 		*(triangles++) = vertex_remap[indices[i++]];
 		++(*triangle_count);
 	}
 }

 } // namespace mc

--- a/src/antkeeper/marching-cubes.hpp
+++ b/src/antkeeper/marching-cubes.hpp
@ -0,0 +1,58 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MARCHING_CUBES_HPP
 #define ANTKEEPER_MARCHING_CUBES_HPP

 #include <cstdint>

 /**
 * Contains functions and constants related to the Marching Cubes (MC) algorithm.
 */
 namespace mc {

 /**
 * Uses the marching cubes algorithm to polygonize a single cell.
 *
 * @param[out] vertices Array which can hold at least 12 vertices (36 floats).
 * @param[out] vertex_count Number of generated vertices.
 * @param[out] triangles Array which can hold 5 at least triangles (15 ints).
 * @param[out] triangle_count Number of generated triangles. The maximum number triangles generated for a single cell is 5.
 */
 void polygonize(float* vertices, std::uint_fast8_t* vertex_count, std::int_fast8_t* triangles, std::uint_fast8_t* triangle_count, const float* corners, const float* distances);

 /**
 * Vertices of a unit cube.
 */
 constexpr float unit_cube[8][3] =
 {
 	{0, 0, 0},
 	{1, 0, 0},
 	{1, 1, 0},
 	{0, 1, 0},
 	{0, 0, 1},
 	{1, 0, 1},
 	{1, 1, 1},
 	{0, 1, 1}
 };

 } // namespace mc

 #endif // ANTKEEPER_MARCHING_CUBES_HPP

--- a/src/antkeeper/math.hpp
+++ b/src/antkeeper/math.hpp
@ -0,0 +1,75 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MATH_HPP
 #define ANTKEEPER_MATH_HPP

 #include <cstdlib>
 #include <type_traits>
 #include <vmq/vmq.hpp>

 using namespace vmq::operators;

 inline float frand(float start, float end)
 {
    float f = (float)std::rand() / RAND_MAX;
    return start + f * (end - start);
 }

 namespace math {

 /**
 * Reinterprets data as an `N`-dimensional vector of type `T`.
 *
 * @tparam N Number of vector dimensions.
 * @tparam T Scalar type.
 * @param data Data to reinterpret.
 */
 template <std::size_t N, typename T>
 inline vmq::vector<T, N>& as_vector(T& data)
 {
 	static_assert(std::is_pod<vmq::vector<T, N>>::value);
 	return reinterpret_cast<vmq::vector<T, N>&>(data);
 }

 /**
 * Reinterprets data as an `NxM` matrix of type `T`.
 *
 * @tparam N Number of columns.
 * @tparam M Number of rows.
 * @tparam T Element type.
 * @param data Data to reinterpret.
 */
 template <std::size_t N, std::size_t M, typename T>
 inline vmq::matrix<T, N, M>& as_matrix(T& data)
 {
 	static_assert(std::is_pod<vmq::matrix<T, N, M>>::value);
 	return reinterpret_cast<vmq::matrix<T, N, M>&>(data);
 }

 template <class T>
 vmq::vector<T, 3> project_on_plane(const vmq::vector<T, 3>& v, const vmq::vector<T, 3>& p, const vmq::vector<T, 3>& n)
 {
 	return v - n * vmq::dot(v - p, n);
 }

 } // namespace math

 #endif // ANTKEEPER_MATH_HPP

--- a/src/antkeeper/morton.cpp
+++ b/src/antkeeper/morton.cpp
@ -0,0 +1,85 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "morton.hpp"

 namespace morton {

 std::uint32_t encode_2d(std::uint32_t x, std::uint32_t y)
 {
 	auto interleave = [](std::uint32_t x) -> std::uint32_t
 	{
 		x &= 0x0000ffff;
 		x = (x ^ (x <<  8)) & 0x00ff00ff;
 		x = (x ^ (x <<  4)) & 0x0f0f0f0f;
 		x = (x ^ (x <<  2)) & 0x33333333;
 		x = (x ^ (x <<  1)) & 0x55555555;
 		return x;
 	};
 	
 	return (interleave(y) << 1) + interleave(x);
 }

 std::uint32_t encode_3d(std::uint32_t x, std::uint32_t y, std::uint32_t z)
 {
 	auto interleave = [](std::uint32_t x) -> std::uint32_t
 	{
 		x &= 0x000003ff;
 		x = (x ^ (x << 16)) & 0xff0000ff;
 		x = (x ^ (x <<  8)) & 0x0300f00f;
 		x = (x ^ (x <<  4)) & 0x030c30c3;
 		x = (x ^ (x <<  2)) & 0x09249249;
 		return x;
 	};

 	return interleave(x) | (interleave(y) << 1) | (interleave(z) << 2);
 }

 std::array<uint32_t, 2> decode_2d(std::uint32_t code)
 {
 	auto unravel = [](std::uint32_t x) -> std::uint32_t
 	{
 		x &= 0x55555555;
 		x = (x ^ (x >>  1)) & 0x33333333;
 		x = (x ^ (x >>  2)) & 0x0f0f0f0f;
 		x = (x ^ (x >>  4)) & 0x00ff00ff;
 		x = (x ^ (x >>  8)) & 0x0000ffff;
 		return x;
 	};

 	return {unravel(code >> 0), unravel(code >> 1)};
 }

 std::array<uint32_t, 3> decode_3d(std::uint32_t code)
 {
 	auto unravel = [](std::uint32_t x) -> std::uint32_t
 	{
 		x &= 0x09249249;
 		x = (x ^ (x >>  2)) & 0x030c30c3;
 		x = (x ^ (x >>  4)) & 0x0300f00f;
 		x = (x ^ (x >>  8)) & 0xff0000ff;
 		x = (x ^ (x >> 16)) & 0x000003ff;
 		return x;
 	};

 	return {unravel(code >> 0), unravel(code >> 1), unravel(code >> 2)};
 }

 } // namespace morton

--- a/src/antkeeper/morton.hpp
+++ b/src/antkeeper/morton.hpp
@ -0,0 +1,46 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_MORTON_HPP
 #define ANTKEEPER_MORTON_HPP

 #include <array>
 #include <cstdint>

 /**
 * Contains functions for encoding and decoding Morton location codes.
 */
 namespace morton {

 /// Encodes 2D coordinates as a 32-bit Morton location code.
 std::uint32_t encode_2d(std::uint32_t x, std::uint32_t y);

 /// Encodes 3D coordinates as a 32-bit Morton location code.
 std::uint32_t encode_3d(std::uint32_t x, std::uint32_t y, std::uint32_t z);

 /// Decodes X and Y coordinates from a 32-bit Morton location code.
 std::array<uint32_t, 2> decode_2d(std::uint32_t code);

 /// Decodes X, Y, and Z coordinates from a 32-bit Morton location code.
 std::array<uint32_t, 3> decode_3d(std::uint32_t code);

 } // namespace morton

 #endif // ANTKEEPER_MORTON_HPP

--- a/src/antkeeper/nest.cpp
+++ b/src/antkeeper/nest.cpp
@ -0,0 +1,99 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "nest.hpp"
 #include "animation/easings.hpp"
 #include "marching-cubes.hpp"
 #include "geometry/mesh-functions.hpp"
 #include "sdf.hpp"
 #include <functional>
 #include <iostream>
 #include <map>
 #include <vector>

 #include "math.hpp"
 #include <functional>
 #include <limits>

 nest::nest()
 {
 	dig_radius = 1.25f;
 }

 float3 nest::extend_shaft(shaft& shaft)
 {
 	float3 dig_position = get_shaft_position(shaft, shaft.current_depth);

 	float dr = frand(dig_radius * 0.75f, dig_radius * 1.25f);

 	shaft.current_depth += dr * 0.5f;

 	return dig_position;
 }

 float3 nest::expand_chamber(chamber& chamber)
 {
 	float dig_angle = frand(0.0f, vmq::two_pi<float>);
 	float2 dig_direction = vmq::normalize(float2{std::cos(dig_angle), std::sin(dig_angle)});

 	float3 chamber_center = get_shaft_position(*chamber.shaft, chamber.depth);
 	float3 dig_position = chamber_center;

 	float dr = frand(dig_radius * 0.75f, dig_radius * 1.25f);

 	float t = frand(0.0f, 1.0f);
 	dig_position.x += dig_direction.x * (chamber.outer_radius - dr) * t;
 	dig_position.z += dig_direction.y * (chamber.outer_radius - dr) * t;

 	return dig_position;
 }

 void nest::set_tunnel_radius(float radius)
 {
 	tunnel_radius = radius;
 }

 float nest::get_shaft_angle(const shaft& shaft, float depth) const
 {
 	float shaft_length = shaft.depth[1] - shaft.depth[0];
 	float depth_factor = (depth - shaft.depth[0]) / shaft_length;
 	float pitch = ease_linear(shaft.pitch[0], shaft.pitch[1], depth_factor);
 	return shaft.rotation + (depth / pitch) * shaft.chirality;
 }

 float3 nest::get_shaft_position(const shaft& shaft, float depth) const
 {
 	float shaft_length = shaft.depth[1] - shaft.depth[0];
 	float depth_factor = (depth - shaft.depth[0]) / shaft_length;

 	float pitch = ease_linear(shaft.pitch[0], shaft.pitch[1], depth_factor);
 	float radius = ease_out_expo(shaft.radius[0], shaft.radius[1], depth_factor);
 	float translation_x = ease_linear(shaft.translation[0][0], shaft.translation[1][0], depth_factor);
 	float translation_z = ease_linear(shaft.translation[0][1], shaft.translation[1][1], depth_factor);
 	float angle = shaft.rotation + (depth / pitch) * shaft.chirality;

 	float3 position;
 	position[0] = std::cos(angle) * radius + translation_x;
 	position[1] = -std::max<float>(shaft.depth[0], std::min<float>(shaft.depth[1], depth));
 	position[2] = std::sin(angle) * radius + translation_z;

 	return position;

 }

--- a/src/antkeeper/nest.hpp
+++ b/src/antkeeper/nest.hpp
@ -0,0 +1,91 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_NEST_HPP
 #define ANTKEEPER_NEST_HPP

 #include "geometry/mesh.hpp"
 #include <vmq/vmq.hpp>
 #include <array>
 #include <vector>

 using namespace vmq::types;
 using namespace vmq::operators;

 class nest
 {
 public:
 	struct chamber;

 	struct shaft
 	{
 		std::array<float, 2> depth;  ///< start and end shaft depth
 		float chirality; ///< 1 = right-handed, -1 = left-handed
 		float rotation;  ///< starting helix angle, in radians
 		std::array<float, 2> radius; ///< start and end helix radius
 		std::array<float, 2> pitch;  ///< start and end helix pitch
 		std::array<float2, 2> translation; ///< start and end helix translation
 		std::vector<chamber> chambers;
 		float current_depth;
 	};

 	struct chamber
 	{
 		shaft* shaft; ///< parent shaft
 		float depth; ///< chamber depth, relative to parent shaft
 		float rotation; ///< chamber rotation, relative to helix angle
 		float sector_angle; ///<
 		float inner_radius;
 		float outer_radius;
 	};

 	/**
 	 * Creates a nest.
 	 */
 	nest();

 	float3 extend_shaft(shaft& shaft);
 	float3 expand_chamber(chamber& chamber);

 	void regenerate();

 	void set_tunnel_radius(float radius);

 	shaft* get_central_shaft();

 	/**
 	 * Calculates the position on a shaft at the specified depth.
 	 */
 	float3 get_shaft_position(const shaft& shaft, float depth) const;

 	float get_shaft_angle(const shaft& shaft, float depth) const;
 	
 private:
 	float tunnel_radius;
 	shaft central_shaft;
 	float dig_radius;
 };

 inline nest::shaft* nest::get_central_shaft()
 {
 	return &central_shaft;
 }

 #endif // ANTKEEPER_NEST_HPP

--- a/src/antkeeper/octree.hpp
+++ b/src/antkeeper/octree.hpp
@ -0,0 +1,455 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_OCTREE_HPP
 #define ANTKEEPER_OCTREE_HPP

 #include <cstdint>
 #include <limits>
 #include <type_traits>
 #include <unordered_set>
 #include <stack>

 /**
 * A general purpose (hashed) linear octree. Nodes are integer identifiers and no other data is stored in the octree.
 *
 * @tparam T Integer node type. Must be 16-bit, 32-bit, or 64-bit.
 *
 * @see http://codervil.blogspot.com/2015/10/octree-node-identifiers.html
 * @see https://geidav.wordpress.com/2014/08/18/advanced-octrees-2-node-representations/
 */
 template <class T>
 class octree
 {
 private:
 	/// Compile-time calculation of the minimum bits required to represent `n` state changes.
 	static constexpr T ceil_log2(T n);

 public:
 	static_assert(std::is_integral<T>::value, "Node type must be integral.");
 	static_assert(sizeof(T) == 2 || sizeof(T) == 4 || sizeof(T) == 8, "Node type must be 16-bit, 32-bit, or 64-bit.");

 	/// Maximum octree depth
 	static constexpr T max_depth = (sizeof(T) == 2) ? 3 : (sizeof(T) == 4) ? 8 : 18;

 	/// Number of bits in the node type
 	static constexpr T node_bits = sizeof(T) * 8;

 	/// Number of bits used to encode the depth of a node.
 	static constexpr T depth_bits = ceil_log2(max_depth + 1);

 	/// Number of bits used to encode the Morton code location a node.
 	static constexpr T location_bits = (max_depth + 1) * 3;

 	/// Integer node type.
 	typedef T node_type;

 	/// Root node which is always guaranteed to exist.
 	static constexpr node_type root = 0;

 	/**
 	 * Accesses nodes in their internal hashmap order.
 	 */
 	struct unordered_iterator
 	{
 		inline unordered_iterator(const unordered_iterator& other): set_iterator(other.set_iterator) {};
 		inline unordered_iterator& operator=(const unordered_iterator& other) { this->set_iterator = other.set_iterator; return *this; };
 		inline unordered_iterator& operator++() { ++(this->set_iterator); return *this; };
 		inline unordered_iterator& operator--() { --(this->set_iterator); return *this; };
 		inline bool operator==(const unordered_iterator& other) const { return this->set_iterator == other.set_iterator; };
 		inline bool operator!=(const unordered_iterator& other) const { return this->set_iterator != other.set_iterator; };
 		inline const node_type& operator*() const { return *this->set_iterator; };
 	private:
 		friend class octree;
 		inline explicit unordered_iterator(const typename std::unordered_set<node_type>::const_iterator& it): set_iterator(it) {};
 		typename std::unordered_set<node_type>::const_iterator set_iterator;
 	};

 	/**
 	 * Accesses nodes in z-order. TODO: I think this can be done without a stack.
 	 */
 	struct iterator
 	{
 		inline iterator(const iterator& other): octree(other.octree), stack(other.stack) {};
 		inline iterator& operator=(const iterator& other) { this->octree = other.octree; this->stack = other.stack; return *this; };
 		iterator& operator++();
 		inline bool operator==(const iterator& other) const { return **this == *other; };
 		inline bool operator!=(const iterator& other) const { return **this != *other; };
 		inline const node_type& operator*() const { return stack.top(); };
 	private:
 		friend class octree;
 		inline explicit iterator(const octree* octree, node_type node): octree(octree), stack({node}) {};
 		const octree* octree;
 		std::stack<node_type> stack;
 	};

 	/**
 	 * Returns the depth of a node.
 	 *
 	 * @param node Node.
 	 * @return Depth of the node.
 	 */
 	static T depth(node_type node);

 	/**
 	 * Returns the Morton code location of a node.
 	 *
 	 * @param node Node.
 	 * @return Morton code location of the node.
 	 */
 	static T location(node_type node);

 	/**
 	 * Returns the node at the given depth and location.
 	 *
 	 * @param depth Node depth.
 	 * @param location Node Morton code location.
 	 */
 	static node_type node(T depth, T location);

 	/**
 	 * Returns the ancestor of a node at the specified depth.
 	 *
 	 * @param node Node whose ancestor will be located.
 	 * @param depth Absolute depth of the ancestors.
 	 * @return Ancestral node.
 	 */
 	static node_type ancestor(node_type node, T depth);

 	/**
 	 * Returns the parent of a node.
 	 *
 	 * @param node Node.
 	 * @return Parent node.
 	 */
 	static node_type parent(node_type node);

 	/**
 	 * Returns the nth sibling of a node.
 	 *
 	 * @param node Node.
 	 * @param n Offset to next sibling. (Automatically wraps to 0..7)
 	 * @return Next sibling node.
 	 */
 	static node_type sibling(node_type node, T n);

 	/**
 	 * Returns the nth child of a node.
 	 *
 	 * @param node Parent node.
 	 * @param n Offset to the nth sibling of the first child node. (Automatically wraps to 0..7)
 	 * @return nth child node.
 	 */
 	static node_type child(node_type node, T n);

 	/**
 	 * Calculates the first common ancestor of two nodes.
 	 *
 	 * @param a First node.
 	 * @param b Second node.
 	 * @return First common ancestor of the two nodes.
 	 */
 	static node_type common_ancestor(node_type a, node_type b);

 	/// Creates an octree with a single root node.
 	octree();

 	/// Returns a z-order iterator to the root node.
 	iterator begin() const;

 	/// Returns a z-order iterator indicating the end of a traversal.
 	iterator end() const;

 	/// Returns an iterator to the specified node.
 	iterator find(node_type node) const;

 	/// Returns an unordered iterator indicating the beginning of a traversal.
 	unordered_iterator unordered_begin() const;

 	/// Returns an unordered iterator indicating the end of a traversal.
 	unordered_iterator unordered_end() const;

 	/**
 	 * Inserts a node and its siblings into the octree, creating its ancestors as necessary. Note: The root node is persistent and cannot be inserted.
 	 *
 	 * @param node Node to insert.
 	 */
 	void insert(node_type node);

 	/**
 	 * Erases a node along with its siblings and descendants. Note: The root node is persistent and cannot be erased.
 	 *
 	 * @param node Node to erase.
 	 */
 	void erase(node_type node);

 	/**
 	 * Erases all nodes except the root.
 	 */
 	void clear();

 	/// Returns `true` if the node exists in the octree, and `false` otherwise.
 	bool exists(node_type node) const;

 	/// Returns `true` if the node has no children, and `false` otherwise.
 	bool is_leaf(node_type node) const;

 	/// Returns the number of nodes in the octree.
 	std::size_t size() const;

 private:
 	/// Compile-time pow()
 	static constexpr T pow(T x, T exponent);

 	/// Count leading zeros
 	static T clz(T x);

 	std::unordered_set<node_type> nodes;
 };

 /**
 * Octree with a 16-bit node type and a maximum depth of `3`.
 */
 typedef octree<std::uint16_t> octree16;

 /**
 * Octree with a 32-bit node type and a maximum depth of `8`.
 */
 typedef octree<std::uint32_t> octree32;

 /**
 * Octree with a 64-bit node type and a maximum depth of `18`.
 */
 typedef octree<std::uint64_t> octree64;

 template <typename T>
 typename octree<T>::iterator& octree<T>::iterator::operator++()
 {
 	// Get next node from top of stack
 	node_type node = stack.top();
 	stack.pop();

 	// If the node has children
 	if (!octree->is_leaf(node))
 	{
 		// Push first child onto the stack
 		for (T i = 0; i < 8; ++i)
 			stack.push(child(node, 7 - i));
 	}

 	if (stack.empty())
 		stack.push(std::numeric_limits<T>::max());

 	return *this;
 }

 template <class T>
 constexpr T octree<T>::ceil_log2(T n)
 {
 	return (n <= 1) ? 0 : ceil_log2((n + 1) / 2) + 1;
 }

 template <class T>
 inline T octree<T>::depth(node_type node)
 {
 	// Extract depth using a bit mask
 	constexpr T mask = pow(2, depth_bits) - 1;
 	return node & mask;
 }

 template <class T>
 inline T octree<T>::location(node_type node)
 {
 	return node >> ((node_bits - 1) - depth(node) * 3);
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::node(T depth, T location)
 {
 	return (location << ((node_bits - 1) - depth * 3)) | depth;
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::ancestor(node_type node, T depth)
 {
 	const T mask = std::numeric_limits<T>::max() << ((node_bits - 1) - depth * 3);
    return (node & mask) | depth;
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::parent(node_type node)
 {
 	return ancestor(node, depth(node) - 1);
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::sibling(node_type node, T n)
 {
 	T depth = octree::depth(node);
 	T location = node >> ((node_bits - 1) - depth * 3);
 	return octree::node(depth, (location & (~0b111)) | ((location + n) & 0b111));
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::child(node_type node, T n)
 {
 	return sibling(node + 1, n);
 }

 template <class T>
 inline typename octree<T>::node_type octree<T>::common_ancestor(node_type a, node_type b)
 {
 	T bits = std::min<T>(depth(a), depth(b)) * 3;
 	T marker = (T(1) << (node_bits - 1)) >> bits;
 	T depth = clz((a ^ b) | marker) / 3;
 	return ancestor(a, depth);
 }

 template <class T>
 inline octree<T>::octree():
 	nodes({0})
 {}

 template <class T>
 void octree<T>::insert(node_type node)
 {
 	if (exists(node))
 		return;
 	
 	// Insert node
 	nodes.emplace(node);

 	// Insert siblings
 	for (T i = 1; i < 8; ++i)
 		nodes.emplace(sibling(node, i));
 	
 	// Insert parent as necessary
 	node_type parent = octree::parent(node);
 	if (!exists(parent))
 		insert(parent);
 }

 template <class T>
 void octree<T>::erase(node_type node)
 {
 	// Don't erase the root!
 	if (node == root)
 		return;
 	
 	for (T i = 0; i < 8; ++i)
 	{
 		// Erase node
 		nodes.erase(node);

 		// Erase descendants
 		if (!is_leaf(node))
 		{
 			for (T j = 0; j < 8; ++j)
 				erase(child(node, j));
 		}

 		// Go to next sibling
 		if (i < 7)
 			node = sibling(node, i);
 	}
 }

 template <class T>
 void octree<T>::clear()
 {
 	nodes = {0};
 }

 template <class T>
 inline bool octree<T>::exists(node_type node) const
 {
 	return (nodes.find(node) != nodes.end());
 }

 template <class T>
 inline bool octree<T>::is_leaf(node_type node) const
 {
 	return !exists(child(node, 0));
 }

 template <class T>
 inline std::size_t octree<T>::size() const
 {
 	return nodes.size();
 }

 template <class T>
 typename octree<T>::iterator octree<T>::begin() const
 {
 	return iterator(this, octree::root);
 }

 template <class T>
 typename octree<T>::iterator octree<T>::end() const
 {
 	return iterator(this, std::numeric_limits<T>::max());
 }

 template <class T>
 typename octree<T>::iterator octree<T>::find(node_type node) const
 {
 	return exists(node) ? iterator(node) : end();
 }

 template <class T>
 typename octree<T>::unordered_iterator octree<T>::unordered_begin() const
 {
 	return unordered_iterator(nodes.begin());
 }

 template <class T>
 typename octree<T>::unordered_iterator octree<T>::unordered_end() const
 {
 	return unordered_iterator(nodes.end());
 }

 template <class T>
 constexpr T octree<T>::pow(T x, T exponent)
 {
 	return (exponent == 0) ? 1 : x * pow(x, exponent - 1);
 }

 template <class T>
 T octree<T>::clz(T x)
 {
 	if (!x)
 		return sizeof(T) * 8;
 	
 	#if defined(__GNU__)
 		return __builtin_clz(x);
 	#else
 		T n = 0;

 		while ((x & (T(1) << (8 * sizeof(x) - 1))) == 0)
 		{
 			x <<= 1;
 			++n;
 		}

 		return n;
 	#endif
 }

 #endif // ANTKEEPER_OCTREE_HPP

--- a/src/antkeeper/orbit-cam.cpp
+++ b/src/antkeeper/orbit-cam.cpp
@ -0,0 +1,161 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "orbit-cam.hpp"
 #include "scene/camera.hpp"
 #include <algorithm>
 #include <cmath>

 using namespace vmq::operators;

 template <class T>
 static inline T lerp(const T& x, const T& y, float a)
 {
 	return x * (1.0f - a) + y * a;
 }

 orbit_cam::orbit_cam():
 	elevation_rotation(vmq::identity_quaternion<float>),
 	azimuth_rotation(vmq::identity_quaternion<float>),
 	target_elevation_rotation(vmq::identity_quaternion<float>),
 	target_azimuth_rotation(vmq::identity_quaternion<float>),
 	target_rotation(vmq::identity_quaternion<float>)
 {}

 orbit_cam::~orbit_cam()
 {}

 void orbit_cam::update(float dt)
 {
 	float interpolation_factor = 1.0f;

 	// Calculate rotation and target rotation quaternions
 	//rotation = azimuth_rotation * elevation_rotation;
 	target_rotation = vmq::normalize(target_azimuth_rotation * target_elevation_rotation);
 	
 	// Calculate target translation
 	target_translation = target_focal_point + target_rotation * float3{0.0f, 0.0f, target_focal_distance};
 	
 	// Interpolate rotation
 	//rotation = glm::mix(rotation, target_rotation, interpolation_factor);
 	
 	// Interpolate angles
 	set_elevation(lerp(elevation, target_elevation, interpolation_factor));
 	set_azimuth(lerp(azimuth, target_azimuth, interpolation_factor));
 	
 	// Calculate rotation
 	set_rotation(vmq::normalize(azimuth_rotation * elevation_rotation));
 	
 	// Interpolate focal point and focal distance
 	focal_point = vmq::lerp(focal_point, target_focal_point, interpolation_factor);
 	focal_distance = lerp(focal_distance, target_focal_distance, interpolation_factor);
 	
 	// Caluclate translation
 	set_translation(focal_point + get_rotation() * float3{0.0f, 0.0f, focal_distance});
 	/*
 	// Recalculate azimuth
 	azimuth_rotation = rotation;
 	azimuth_rotation.x = 0.0f;
 	azimuth_rotation.z = 0.0f;
 	azimuth_rotation = glm::normalize(azimuth_rotation);
 	azimuth = 2.0f * std::acos(azimuth_rotation.w);
 	
 	// Recalculate elevation
 	elevation_rotation = rotation;
 	elevation_rotation.y = 0.0f;
 	elevation_rotation.z = 0.0f;
 	elevation_rotation = glm::normalize(elevation_rotation);
 	elevation = 2.0f * std::acos(elevation_rotation.w);
 	*/
 	
 	// Update camera
 	if (get_camera() != nullptr)
 	{
 		transform<float> transform = vmq::identity_transform<float>;
 		transform.translation = get_translation();
 		transform.rotation = get_rotation();
 		get_camera()->set_transform(transform);
 		//get_camera()->look_at(get_translation(), get_translation() + get_forward(), get_up());
 	}
 }

 void orbit_cam::move(const float2& direction)
 {
 	target_focal_point += azimuth_rotation * float3{direction[0], 0.0f, direction[1]};
 }

 void orbit_cam::rotate(float angle)
 {
 	set_target_azimuth(target_azimuth + angle);
 }

 void orbit_cam::tilt(float angle)
 {
 	set_target_elevation(target_elevation + angle);
 }

 void orbit_cam::zoom(float distance)
 {
 	set_target_focal_distance(target_focal_distance - distance);
 }

 void orbit_cam::set_focal_point(const float3& point)
 {
 	focal_point = point;
 }

 void orbit_cam::set_focal_distance(float distance)
 {
 	focal_distance = distance;
 }

 void orbit_cam::set_elevation(float angle)
 {
 	elevation = angle;
 	elevation_rotation = vmq::angle_axis(elevation, float3{-1.0f, 0.0f, 0.0f});
 }

 void orbit_cam::set_azimuth(float angle)
 {
 	azimuth = angle;
 	azimuth_rotation = vmq::angle_axis(azimuth, float3{0.0f, 1.0f, 0.0f});
 }

 void orbit_cam::set_target_focal_point(const float3& point)
 {
 	target_focal_point = point;
 }

 void orbit_cam::set_target_focal_distance(float distance)
 {
 	target_focal_distance = distance;
 }

 void orbit_cam::set_target_elevation(float angle)
 {
 	target_elevation = angle;
 	target_elevation_rotation = vmq::angle_axis(target_elevation, float3{-1.0f, 0.0f, 0.0f});
 }

 void orbit_cam::set_target_azimuth(float angle)
 {
 	target_azimuth = angle;
 	target_azimuth_rotation = vmq::angle_axis(target_azimuth, float3{0.0f, 1.0f, 0.0f});
 }

--- a/src/antkeeper/orbit-cam.hpp
+++ b/src/antkeeper/orbit-cam.hpp
@ -0,0 +1,130 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #ifndef ANTKEEPER_ORBIT_CAM_HPP
 #define ANTKEEPER_ORBIT_CAM_HPP

 #include "camera-rig.hpp"

 /**
 * Rig which orbits around a focal point.
 */
 class orbit_cam: public camera_rig
 {
 public:
 	orbit_cam();
 	virtual ~orbit_cam();
 	virtual void update(float dt);
 	
 	/// @param direction Specifies the movement direction and speed scale on the XZ plane
 	void move(const float2& direction);
 	void rotate(float angle);
 	void tilt(float angle);
 	void zoom(float distance);
 	
 	void set_focal_point(const float3& point);
 	void set_focal_distance(float distance);
 	void set_elevation(float angle);
 	void set_azimuth(float angle);
 	void set_target_focal_point(const float3& point);
 	void set_target_focal_distance(float distance);
 	void set_target_elevation(float angle);
 	void set_target_azimuth(float angle);
 	
 	const float3& get_focal_point() const;
 	float get_focal_distance() const;
 	float get_elevation() const;
 	float get_azimuth() const;
 	const float3& get_target_focal_point() const;
 	float get_target_focal_distance() const;
 	float get_target_elevation() const;
 	float get_target_azimuth() const;
 	const float3& get_target_translation() const;
 	const vmq::quaternion<float>& get_target_rotation() const;
 	
 private:
 	float3 focal_point;
 	float focal_distance;
 	float elevation;
 	float azimuth;
 	
 	float3 target_focal_point;
 	float target_focal_distance;
 	float target_elevation;
 	float target_azimuth;
 	
 	vmq::quaternion<float> elevation_rotation;
 	vmq::quaternion<float> azimuth_rotation;
 	vmq::quaternion<float> target_elevation_rotation;
 	vmq::quaternion<float> target_azimuth_rotation;
 	vmq::quaternion<float> target_rotation;
 	float3 target_translation;
 };

 inline const float3& orbit_cam::get_focal_point() const
 {
 	return focal_point;
 }

 inline float orbit_cam::get_focal_distance() const
 {
 	return focal_distance;
 }

 inline float orbit_cam::get_elevation() const
 {
 	return elevation;
 }

 inline float orbit_cam::get_azimuth() const
 {
 	return azimuth;
 }

 inline const float3& orbit_cam::get_target_focal_point() const
 {
 	return target_focal_point;
 }

 inline float orbit_cam::get_target_focal_distance() const
 {
 	return target_focal_distance;
 }

 inline float orbit_cam::get_target_elevation() const
 {
 	return target_elevation;
 }

 inline float orbit_cam::get_target_azimuth() const
 {
 	return target_azimuth;
 }

 inline const float3& orbit_cam::get_target_translation() const
 {
 	return target_translation;
 }

 inline const vmq::quaternion<float>& orbit_cam::get_target_rotation() const
 {
 	return target_rotation;
 }

 #endif // ANTKEEPER_ORBIT_CAM_HPP
--- a/src/antkeeper/pheromone-matrix.cpp
+++ b/src/antkeeper/pheromone-matrix.cpp
@ -0,0 +1,90 @@
 /*
 * Copyright (C) 2020  Christopher J. Howard
 *
 * This file is part of Antkeeper source code.
 *
 * Antkeeper source code is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * Antkeeper source code is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with Antkeeper source code.  If not, see <http://www.gnu.org/licenses/>.
 */

 #include "pheromone-matrix.hpp"
 #include <vmq/vmq.hpp>

 void convolve(pheromone_matrix* matrix, const float* kernel, int kernel_size)
 {
 	float* front = matrix->buffers[matrix->current];
 	float* back = matrix->buffers[(matrix->current + 1) % 2];
 	const int kernel_radius = kernel_size << 1;

 	// For each pheromone matrix row
 	for (int i = 0; i < matrix->rows; ++i)
 	{
 		// For each pheromone in the row
 		for (int j = 0; j < matrix->columns; ++j)
 		{
 			// Reset accumulator
 			float accumulator = 0.0f;

 			// For each kernel row
 			for (int k = -kernel_radius; k <= kernel_radius; ++k)
 			{
 				// For each kernel element
 				for (int l = -kernel_radius; l <= kernel_radius; ++l)
 				{
 					// Determine row and column of pheromone corresponding to the kernel element.
 					int m = i + k;
 					int n = j + l;

 					// If the row and column indices are within the matrix
 					if (m >= 0 && m < matrix->rows && n >= 0 && n < matrix->columns)
 					{
 						// Multiply pheromone strength in the front buffer by the kernel value and add it to the accumulator.
 						accumulator += front[m * matrix->columns + n] * kernel[(k + kernel_radius) * kernel_size + l + kernel_radius];
 					}
 				}
 			}

 			// Set pheromone strength in the back buffer equal to the accumulator value
 			back[i * matrix->columns + j] = accumulator;
 		}
 	}

 	// Swap buffers
 	matrix->current = (matrix->current + 1) % 2;
 }

 void evaporate(pheromone_matrix* matrix, float factor)
 {
 	const int size = matrix->columns * matrix->rows;

 	for (int i = 0; i < size; ++i)
 	{
 		matrix->buffers[matrix->current][i] *= factor;
 	}
 }

 void diffuse(pheromone_matrix* matrix)
 {
 	const vmq::matrix<float, 3, 3> diffusion_kernel =
 		vmq::mul(
 			vmq::matrix<float, 3, 3>
 			{{
 				{1, 2, 1},
 				{2, 4, 2},
 			 	{1, 2, 1}
 			}},
 			1.0f / 16.0f);
 	
 	convolve(matrix, &diffusion_kernel[0][0], 3);
 }