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/*
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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 "render/shader-template.hpp"
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#include "gl/shader-object.hpp"
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#include "gl/shader-program.hpp"
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#include <sstream>
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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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std::string token;
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std::istringstream line_stream((*source)[i]);
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// If line contains a `#pragma include` directive
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if (line_stream >> token && token == "#pragma" &&
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line_stream >> token && token == "include")
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{
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// If third token is enclosed in quotes or angled brackets
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if (line_stream >> token && token.size() > 2 &&
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((token.front() == '\"' && token.back() == '\"') ||
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(token.front() == '<' && token.back() == '>')))
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{
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// Extract include path
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std::string path = token.substr(1, token.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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(*source)[i] = "#error file not found (" + path + ")";
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}
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else
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{
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// Create copy of include file
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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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else
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{
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(*source)[i] = "#error malformed include directive (" + (*source)[i] + ")";
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}
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}
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}
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}
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template <>
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gl::shader_program* resource_loader<gl::shader_program>::load(resource_manager* resource_manager, PHYSFS_File* file, const std::filesystem::path& path)
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{
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// Load shader template source
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text_file source_lines = *resource_loader<text_file>::load(resource_manager, file, path);
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// Handle `#pragma include` directives
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handle_includes(&source_lines, resource_manager);
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// Join vector of source lines into single string
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std::ostringstream stream;
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std::copy(source_lines.begin(), source_lines.end(), std::ostream_iterator<std::string>(stream, "\n"));
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// Create shader template
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render::shader_template* shader = new render::shader_template(stream.str());
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// Build shader program
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gl::shader_program* program = shader->build(render::shader_template::dictionary_type());
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// Check if shader program was linked successfully
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if (!program->was_linked())
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{
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throw std::runtime_error("Shader program linking failed: " + program->get_info_log());
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}
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// Destroy shader template
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delete shader;
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return program;
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}
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