Add SDL2 submodule

.gitmodules

@@ -10,3 +10,6 @@
 [submodule "modules/antkeeper-data"]
 	path = modules/antkeeper-data
 	url = git@cjhoward.org:antkeeper-data.git
+[submodule "modules/SDL2"]
+	path = modules/SDL2
+	url = git@cjhoward.org:SDL2.git

CMakeLists.txt

@@ -50,7 +50,37 @@ set(MODULE_INSTALL_DIR "${CMAKE_BINARY_DIR}/modules/install")
 # Include ExternalProject_Add macro
 include(${CMAKE_ROOT}/Modules/ExternalProject.cmake)
 
-# Build vmq module
+# Build SDL2 module
+ExternalProject_Add(SDL2
+	SOURCE_DIR ${MODULE_SOURCE_DIR}/SDL2
+	BINARY_DIR ${MODULE_BUILD_DIR}/SDL2
+	INSTALL_DIR ${MODULE_INSTALL_DIR}
+	CMAKE_ARGS
+		"-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
+		"-DCMAKE_INSTALL_PREFIX=${MODULE_INSTALL_DIR}"
+		"-DSDL_ATOMIC=OFF"
+		"-DSDL_AUDIO=OFF"
+		"-DSDL_CPUINFO=ON"
+		"-DSDL_DLOPEN=ON"
+		"-DSDL_EVENTS=ON"
+		"-DSDL_FILE=OFF"
+		"-DSDL_FILESYSTEM=OFF"
+		"-DSDL_HAPTIC=ON"
+		"-DSDL_JOYSTICK=ON"
+		"-DSDL_LOADSO=ON"
+		"-DSDL_POWER=ON"
+		"-DSDL_RENDER=OFF"
+		"-DSDL_SHARED=ON"
+		"-DSDL_STATIC=OFF"
+		"-DSDL_STATIC_PIC=OFF"
+		"-DSDL_TEST=OFF"
+		"-DSDL_THREADS=OFF"
+		"-DSDL_TIMERS=ON"
+		"-DSDL_VIDEO=ON"
+		"-DVIDEO_VULKAN=OFF"
+	BUILD_ALWAYS 0)
+
+# Build VMQ module
 ExternalProject_Add(vmq
 	SOURCE_DIR ${MODULE_SOURCE_DIR}/vmq
 	BINARY_DIR ${MODULE_BUILD_DIR}/vmq
@@ -59,11 +89,21 @@ ExternalProject_Add(vmq
 		"-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
 		"-DCMAKE_INSTALL_PREFIX=${MODULE_INSTALL_DIR}"
 		"-DBUILD_EXAMPLES=OFF"
-	BUILD_ALWAYS 1)
+	BUILD_ALWAYS 0)
+
+# Build EnTT module
+ExternalProject_Add(entt
+	SOURCE_DIR ${MODULE_SOURCE_DIR}/entt
+	BINARY_DIR ${MODULE_BUILD_DIR}/entt
+	INSTALL_DIR ${MODULE_INSTALL_DIR}
+	CMAKE_ARGS
+		"-DCMAKE_BUILD_TYPE=${CMAKE_BUILD_TYPE}"
+		"-DCMAKE_INSTALL_PREFIX=${MODULE_INSTALL_DIR}"
+	BUILD_ALWAYS 0)
 
 # Build antkeeper-source module
 ExternalProject_Add(antkeeper-source
-	DEPENDS vmq
+	DEPENDS vmq entt
 	SOURCE_DIR ${MODULE_SOURCE_DIR}/antkeeper-source
 	BINARY_DIR ${MODULE_BUILD_DIR}/antkeeper-source
 	INSTALL_DIR ${PACKAGE_INSTALL_DIR}

modules/SDL2

@@ -0,0 +1 @@
+Subproject commit 417eeb55b6b31c09ca4179458fda30cddc770a55

modules/antkeeper-source

@@ -1 +1 @@
-Subproject commit 03e321ffbef7da575ea74921df625743c3a5c70a
+Subproject commit d59f0df5b43c33ab932f5da5f9f02b9b7909c586