💿🐜 Antkeeper source code
https://antkeeper.com
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108 lines
3.4 KiB
108 lines
3.4 KiB
/*
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* Copyright (C) 2017-2019 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 "resource-loader.hpp"
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#include "image.hpp"
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#include <sstream>
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#include <emergent/emergent.hpp>
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using namespace Emergent;
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template <>
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Texture2D* ResourceLoader<Texture2D>::load(ResourceManager* resourceManager, std::istream* is)
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{
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Image* image = ResourceLoader<Image>::load(resourceManager, is);
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// Generate OpenGL texture ID
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GLuint textureID;
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glGenTextures(1, &textureID);
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glBindTexture(GL_TEXTURE_2D, textureID);
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// Set wrapping and filtering parameters
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_S, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_WRAP_T, GL_REPEAT);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MIN_FILTER, GL_LINEAR);
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glTexParameteri(GL_TEXTURE_2D, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Select texture formats according to number of color channels in the image
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GLint internalFormat;
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GLenum format;
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GLenum type = (image->isHDR()) ? GL_FLOAT : GL_UNSIGNED_BYTE;
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if (image->getChannels() == 1)
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{
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// Grey
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internalFormat = (image->isHDR()) ? GL_R32F : GL_R8;
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format = GL_RED;
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GLint swizzleMask[] = {GL_RED, GL_RED, GL_RED, GL_ONE};
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glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
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}
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else if (image->getChannels() == 2)
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{
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// Grey, alpha
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internalFormat = (image->isHDR()) ? GL_RG32F : GL_RG8;
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format = GL_RG;
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GLint swizzleMask[] = {GL_RED, GL_RED, GL_RED, GL_GREEN};
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glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
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}
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else if (image->getChannels() == 3)
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{
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// Red, green, blue
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internalFormat = (image->isHDR()) ? GL_RGB32F : GL_RGB8;
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format = GL_RGB;
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GLint swizzleMask[] = {GL_RED, GL_GREEN, GL_BLUE, GL_ONE};
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glTexParameteriv(GL_TEXTURE_2D, GL_TEXTURE_SWIZZLE_RGBA, swizzleMask);
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}
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else if (image->getChannels() == 4)
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{
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// Red, green, blue, alpha
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internalFormat = (image->isHDR()) ? GL_RGBA32F : GL_RGBA8;
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format = GL_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->getChannels() << std::string(").");
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delete image;
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glDeleteTextures(1, &textureID);
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throw std::runtime_error(stream.str().c_str());
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}
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// Upload image data to OpenGL
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glPixelStorei(GL_PACK_ALIGNMENT, 1);
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glPixelStorei(GL_UNPACK_ALIGNMENT, 1);
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glTexImage2D(GL_TEXTURE_2D, 0, internalFormat, image->getWidth(), image->getHeight(), 0, format, type, image->getPixels());
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// Generate mipmaps
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glGenerateMipmap(GL_TEXTURE_2D);
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// Create Texture2D
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Texture2D* texture = new Texture2D();
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texture->setTextureID(textureID);
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texture->setWidth(image->getWidth());
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texture->setHeight(image->getHeight());
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// Free loaded image
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delete image;
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return texture;
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}
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