💿🐜 Antkeeper source code
https://antkeeper.com
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210 lines
5.8 KiB
210 lines
5.8 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "resources/resource-loader.hpp"
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#include "resources/resource-manager.hpp"
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#include "resources/text-file.hpp"
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#include "rasterizer/shader-type.hpp"
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#include "rasterizer/shader.hpp"
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#include "rasterizer/shader-program.hpp"
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#include <sstream>
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#include <iterator>
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/**
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* Tokenizes a line of shader source code.
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*/
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static std::vector<std::string> tokenize(const std::string& line)
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{
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std::vector<std::string> tokens;
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std::string token;
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std::istringstream linestream(line);
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while (linestream >> token)
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tokens.push_back(token);
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return tokens;
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}
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/**
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* Handles `#pragma include` directives by loading the specified text files and inserting them in place.
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*/
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static void handle_includes(text_file* source, resource_manager* resource_manager)
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{
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// For each line in the source
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for (std::size_t i = 0; i < source->size(); ++i)
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{
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// Tokenize line
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std::vector<std::string> tokens = tokenize((*source)[i]);
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// Look for `#pragma include` directives
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if (tokens.size() == 3 && tokens[0] == "#pragma" && tokens[1] == "include")
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{
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// Get path to include file
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std::string path = tokens[2].substr(1, tokens[2].length() - 2);
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// Load include file
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if (!resource_manager->load<text_file>(path))
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{
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std::string message = std::string("Failed to load shader include file \"") + path + std::string("\"");
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throw std::runtime_error(message.c_str());
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}
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text_file include_file = *(resource_manager->load<text_file>(path));
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// Handle `#pragma include` directives inside include file
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handle_includes(&include_file, resource_manager);
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// Replace #pragma include directive with include file contents
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source->erase(source->begin() + i);
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source->insert(source->begin() + i, include_file.begin(), include_file.end());
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i += include_file.size() - 1;
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}
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}
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}
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/**
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* Injects the `DEBUG` or `NDEBUG` macros after the `#version` directive.
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*/
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static void inject_debug_macro(text_file* source)
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{
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// For each line in the source
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for (std::size_t i = 0; i < source->size(); ++i)
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{
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// Tokenize line
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std::vector<std::string> tokens = tokenize((*source)[i]);
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// Inject DEBUG and NDEBUG macros
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if (!tokens.empty() && tokens[0] == "#version")
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{
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#if defined(NDEBUG)
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source->insert(source->begin() + i + 1, "#define NDEBUG");
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#else
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source->insert(source->begin() + i + 1, "#define DEBUG");
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#endif
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return;
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}
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}
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}
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/**
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* Injects a shader type macro definition after the `#version` directive.
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*/
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static void inject_shader_type_macro(text_file* source, shader_type type)
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{
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const char* vertex_macro = "#define _VERTEX";
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const char* fragment_macro = "#define _FRAGMENT";
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const char* geometry_macro = "#define _GEOMETRY";
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const char* macro = nullptr;
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if (type == shader_type::vertex)
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macro = vertex_macro;
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else if (type == shader_type::fragment)
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macro = fragment_macro;
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else if (type == shader_type::geometry)
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macro = geometry_macro;
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// For each line in the source
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for (std::size_t i = 0; i < source->size(); ++i)
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{
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// Tokenize line
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std::vector<std::string> tokens = tokenize((*source)[i]);
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// Inject shader type macro
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if (!tokens.empty() && tokens[0] == "#version")
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{
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source->insert(source->begin() + i + 1, macro);
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return;
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}
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}
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}
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static std::list<shader_type> detect_shader_types(text_file* source)
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{
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std::list<shader_type> types;
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// For each line in the source
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for (std::size_t i = 0; i < source->size(); ++i)
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{
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// Tokenize line
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std::vector<std::string> tokens = tokenize((*source)[i]);
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// Look for `#pragma include` directives
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if (tokens.size() == 2 && tokens[0] == "#pragma")
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{
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if (tokens[1] == "vertex")
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{
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types.push_back(shader_type::vertex);
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}
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else if (tokens[1] == "fragment")
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{
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types.push_back(shader_type::fragment);
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}
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else if (tokens[1] == "geometry")
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{
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types.push_back(shader_type::geometry);
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}
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}
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}
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return types;
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}
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static std::string generate_source_buffer(const std::vector<std::string>& source)
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{
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std::ostringstream stream;
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std::copy(source.begin(), source.end(), std::ostream_iterator<std::string>(stream, "\n"));
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return stream.str();
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}
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template <>
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shader_program* resource_loader<shader_program>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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// Load shader source
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text_file* source = resource_loader<text_file>::load(resource_manager, file);
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// Handle `#pragma include` directives
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handle_includes(source, resource_manager);
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// Inject `DEBUG` or `NDEBUG` macro definitions
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inject_debug_macro(source);
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// Detect declared shader types via the `#pragma vertex`, `#pragma fragment` and `#pragma geometry` directives
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std::list<shader_type> shader_types = detect_shader_types(source);
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// Load detected shaders
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std::list<shader*> shaders;
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for (shader_type type: shader_types)
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{
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text_file type_source = *source;
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inject_shader_type_macro(&type_source, type);
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std::string source_buffer = generate_source_buffer(type_source);
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shaders.push_back(new shader(type, source_buffer));
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}
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// Create shader program
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shader_program* program = new shader_program(shaders);
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// Delete shaders
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for (shader* shader: shaders)
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{
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delete shader;
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}
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return program;
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}
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