💿🐜 Antkeeper source code
https://antkeeper.com
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143 lines
4.5 KiB
143 lines
4.5 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/image.hpp"
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#include "gl/pixel-type.hpp"
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#include "gl/pixel-format.hpp"
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#include "gl/color-space.hpp"
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#include "gl/texture-2d.hpp"
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#include "gl/texture-wrapping.hpp"
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#include "gl/texture-filter.hpp"
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#include <sstream>
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#include <nlohmann/json.hpp>
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#include <physfs.h>
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template <>
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gl::texture_2d* resource_loader<gl::texture_2d>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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// Read file into buffer
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std::size_t size = static_cast<int>(PHYSFS_fileLength(file));
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std::string buffer;
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buffer.resize(size);
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PHYSFS_readBytes(file, &buffer[0], size);
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// Parse json from file buffer
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nlohmann::json json = nlohmann::json::parse(buffer);
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// Read image filename
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std::string image_filename;
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if (auto element = json.find("image"); element != json.end())
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image_filename = element.value().get<std::string>();
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// Read color space
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gl::color_space color_space = gl::color_space::linear;
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if (auto element = json.find("color_space"); element != json.end())
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{
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std::string value = element.value().get<std::string>();
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if (value == "linear")
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color_space = gl::color_space::linear;
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else if (value == "srgb")
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color_space = gl::color_space::srgb;
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}
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// Read extension mode
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gl::texture_wrapping wrapping = gl::texture_wrapping::repeat;
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if (auto element = json.find("extension"); element != json.end())
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{
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std::string value = element.value().get<std::string>();
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if (value == "clip")
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wrapping = gl::texture_wrapping::clip;
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else if (value == "extend")
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wrapping = gl::texture_wrapping::extend;
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else if (value == "repeat")
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wrapping = gl::texture_wrapping::repeat;
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else if (value == "mirrored_repeat")
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wrapping = gl::texture_wrapping::mirrored_repeat;
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}
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// Read interpolation mode
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gl::texture_min_filter min_filter = gl::texture_min_filter::linear_mipmap_linear;
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gl::texture_mag_filter mag_filter = gl::texture_mag_filter::linear;
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if (auto element = json.find("interpolation"); element != json.end())
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{
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std::string value = element.value().get<std::string>();
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if (value == "linear")
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{
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min_filter = gl::texture_min_filter::linear_mipmap_linear;
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mag_filter = gl::texture_mag_filter::linear;
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}
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else if (value == "closest")
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{
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min_filter = gl::texture_min_filter::nearest_mipmap_nearest;
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mag_filter = gl::texture_mag_filter::nearest;
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}
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}
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// Read max anisotropy
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float max_anisotropy = 0.0f;
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if (auto element = json.find("max_anisotropy"); element != json.end())
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max_anisotropy = element.value().get<float>();
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// Load image
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::image* image = resource_manager->load<::image>(image_filename);
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// Determine pixel type
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gl::pixel_type type = (image->is_hdr()) ? gl::pixel_type::float_32 : gl::pixel_type::uint_8;
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// Determine pixel format
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gl::pixel_format format;
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if (image->get_channels() == 1)
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{
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format = gl::pixel_format::r;
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}
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else if (image->get_channels() == 2)
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{
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format = gl::pixel_format::rg;
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}
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else if (image->get_channels() == 3)
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{
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format = gl::pixel_format::rgb;
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}
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else if (image->get_channels() == 4)
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{
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format = gl::pixel_format::rgba;
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}
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else
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{
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std::stringstream stream;
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stream << std::string("Texture cannot be created from an image with an unsupported number of color channels (") << image->get_channels() << std::string(").");
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delete image;
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throw std::runtime_error(stream.str().c_str());
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}
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// Create texture
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gl::texture_2d* texture = new gl::texture_2d(image->get_width(), image->get_height(), type, format, color_space, image->get_pixels());
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// Set wrapping and filtering
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texture->set_wrapping(wrapping, wrapping);
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texture->set_filters(min_filter, mag_filter);
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texture->set_max_anisotropy(max_anisotropy);
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// Free loaded image
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resource_manager->unload(image_filename);
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return texture;
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}
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