💿🐜 Antkeeper source code
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377 lines
9.1 KiB
377 lines
9.1 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 "resource-manager.hpp"
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#include "text-file.hpp"
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#include <sstream>
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#include <stdexcept>
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#include <emergent/emergent.hpp>
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using namespace Emergent;
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namespace CubemapLayout
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{
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enum
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{
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VERTICAL_CROSS,
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HORIZONTAL_CROSS,
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VERTICAL_STRIP,
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HORIZONTAL_STRIP,
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BLENDER
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};
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}
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static const int CUBEMAP_LAYOUT_DIMENSIONS[5][2] =
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{
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{3, 4}, // Vertical cross
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{4, 3}, // Horizontal cross
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{1, 6}, // Vertical strip
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{6, 1}, // Horizontal strip
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{3, 2} // Blender
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};
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static const int CUBEMAP_LAYOUT_OFFSETS[5][6][2] =
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{
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// Vertical cross
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{
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{0, 1}, // +X
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{2, 1}, // -X
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{1, 0}, // +Y
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{1, 2}, // -Y
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{1, 1}, // +Z
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{1, 3} // -Z
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},
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// Horizontal cross
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{
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{0, 1}, // +X
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{2, 1}, // -X
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{1, 0}, // +Y
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{1, 2}, // -Y
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{1, 1}, // +Z
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{3, 1} // -Z
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},
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// Vertical strip
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{
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{0, 1}, // +X
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{0, 0}, // -X
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{0, 2}, // +Y
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{0, 3}, // -Y
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{0, 4}, // +Z
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{0, 5} // -Z
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},
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// Horizontal strip
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{
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{1, 0}, // +X
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{0, 0}, // -X
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{2, 0}, // +Y
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{3, 0}, // -Y
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{4, 0}, // +Z
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{5, 0} // -Z
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},
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// Blender
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{
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{0, 0}, // +X
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{2, 0}, // -X
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{1, 1}, // +Y
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{0, 1}, // -Y
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{1, 0}, // +Z
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{2, 1} // -Z
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}
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};
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static const bool CUBEMAP_LAYOUT_FLIPS[5][6][2] =
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{
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// Vertical cross
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{
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{true, true}, // +X
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{true, true}, // -X
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{true, true}, // +Y
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{true, true}, // -Y
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{true, true}, // +Z
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{false, false}, // -Z
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},
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// Horizontal cross
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{
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{true, true}, // +X
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{true, true}, // -X
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{true, true}, // +Y
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{true, true}, // -Y
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{true, true}, // +Z
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{true, true}, // -Z
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},
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// Vertical strip
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{
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{true, true}, // +X
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{true, true}, // -X
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{true, true}, // +Y
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{true, true}, // -Y
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{true, true}, // +Z
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{true, true}, // -Z
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},
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// Horizontal strip
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{
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{true, true}, // +X
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{true, true}, // -X
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{true, true}, // +Y
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{true, true}, // -Y
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{true, true}, // +Z
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{true, true}, // -Z
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},
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// Blender
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{
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{true, true}, // +X
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{true, true}, // -X
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{true, true}, // +Y
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{true, true}, // -Y
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{true, true}, // +Z
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{true, true}, // -Z
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}
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};
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static void loadCubemapMipmap(TextureCube* texture, std::size_t level, Image* image)
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{
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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_CUBE_MAP, 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_CUBE_MAP, 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_CUBE_MAP, 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("Mipmap cannot be loaded from an image with an unsupported number of color channels (") << image->getChannels() << std::string(").");
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throw std::runtime_error(stream.str().c_str());
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}
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// Determine cubemap layout
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int layout = -1;
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for (std::size_t i = 0; i < 5; ++i)
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{
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// Compare aspect ratio of image to known cubemap layouts
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float aspectRatio = static_cast<float>(CUBEMAP_LAYOUT_DIMENSIONS[i][0]) / static_cast<float>(CUBEMAP_LAYOUT_DIMENSIONS[i][1]);
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if (static_cast<unsigned int>((static_cast<float>(image->getHeight()) * aspectRatio)) == image->getWidth())
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{
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layout = i;
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break;
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}
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}
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// Check that a layout was determined
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if (layout == -1)
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{
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throw std::runtime_error("Unsupported cubemap layout.");
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}
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// Calculate cubemap face size
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int faceSize = image->getWidth() / CUBEMAP_LAYOUT_DIMENSIONS[layout][0];
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if (!level)
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{
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texture->setFaceSize(faceSize);
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}
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// Allocate cubemap face pixels
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void* facePixels = nullptr;
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if (image->isHDR())
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{
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facePixels = new float[faceSize * faceSize * image->getChannels()];
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}
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else
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{
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facePixels = new unsigned char[faceSize * faceSize * image->getChannels()];
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}
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// Upload mipmap 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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for (std::size_t faceIndex = 0; faceIndex < 6; ++faceIndex)
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{
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int offsetX = faceSize * CUBEMAP_LAYOUT_OFFSETS[layout][faceIndex][0];
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int offsetY = faceSize * ((CUBEMAP_LAYOUT_DIMENSIONS[layout][1] - 1) - CUBEMAP_LAYOUT_OFFSETS[layout][faceIndex][1]);
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bool flipX = CUBEMAP_LAYOUT_FLIPS[layout][faceIndex][0];
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bool flipY = CUBEMAP_LAYOUT_FLIPS[layout][faceIndex][1];
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for (int y = 0; y < faceSize; ++y)
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{
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for (int x = 0; x < faceSize; ++x)
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{
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std::size_t facePixelIndex;
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int faceX = (flipX) ? (faceSize - 1 - x) : x;
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int faceY = (flipY) ? (faceSize - 1 - y) : y;
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facePixelIndex = (faceY * faceSize + faceX) * image->getChannels();
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std::size_t cubemapPixelIndex = ((offsetY + y) * image->getWidth() + (offsetX + x)) * image->getChannels();
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if (image->isHDR())
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{
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for (int c = 0; c < image->getChannels(); ++c)
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{
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reinterpret_cast<float*>(facePixels)[facePixelIndex + c] = static_cast<float*>(image->getPixels())[cubemapPixelIndex + c];
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}
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}
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else
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{
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for (int c = 0; c < image->getChannels(); ++c)
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{
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reinterpret_cast<unsigned char*>(facePixels)[facePixelIndex + c] = static_cast<unsigned char*>(image->getPixels())[cubemapPixelIndex + c];
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}
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}
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}
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}
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// Upload cubemap face pixels to OpenGL
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glTexImage2D(GL_TEXTURE_CUBE_MAP_POSITIVE_X + faceIndex, level, internalFormat, faceSize, faceSize, 0, format, type, facePixels);
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}
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// Free cubemap face pixels
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if (image->isHDR())
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{
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delete[] reinterpret_cast<float*>(facePixels);
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}
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else
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{
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delete[] reinterpret_cast<unsigned char*>(facePixels);
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}
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}
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template <>
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TextureCube* ResourceLoader<TextureCube>::load(ResourceManager* resourceManager, std::istream* is)
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{
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// Load list of mipmap filenames
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TextFile* mipmapFilenames = ResourceLoader<TextFile>::load(resourceManager, is);
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// Allocate and initialize mipmap array
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std::size_t mipmapCount = mipmapFilenames->size();
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Image** mipmaps = new Image*[mipmapCount];
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for (std::size_t i = 0; i < mipmapCount; ++i)
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{
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mipmaps[i] = nullptr;
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}
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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_CUBE_MAP, textureID);
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// Set wrapping and filtering parameters
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_S, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_T, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_WRAP_R, GL_CLAMP_TO_EDGE);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MIN_FILTER, GL_LINEAR_MIPMAP_LINEAR);
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glTexParameteri(GL_TEXTURE_CUBE_MAP, GL_TEXTURE_MAG_FILTER, GL_LINEAR);
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// Create texture cube
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TextureCube* texture = new TextureCube();
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texture->setTextureID(textureID);
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// Load mipmaps
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std::size_t loadedMipmapCount = 0;
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try
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{
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for (std::size_t i = 0; i < mipmapCount; ++i)
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{
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// Load mipmap image data
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mipmaps[i] = resourceManager->load<Image>((*mipmapFilenames)[i]);
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// Load mipmap from image data
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loadCubemapMipmap(texture, i, mipmaps[i]);
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// Unload mipmap image data
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resourceManager->unload((*mipmapFilenames)[i]);
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mipmaps[i] = nullptr;
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++loadedMipmapCount;
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}
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}
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catch (const std::exception& e)
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{
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std::string error = std::string("ResourceLoader<TextureCube>::load(): Failed to load mipmap \"") + (*mipmapFilenames)[loadedMipmapCount] + std::string("\": \"") + e.what() + std::string("\"");
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// Free TextureCube
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delete texture;
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// Delete OpenGL texture
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glDeleteTextures(1, &textureID);
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// Free loaded mipmap images
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for (std::size_t i = 0; i < mipmapCount; ++i)
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{
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if (mipmaps[i] != nullptr)
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{
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resourceManager->unload((*mipmapFilenames)[i]);
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}
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}
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delete[] mipmaps;
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// Free list of mipmap filenames
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delete mipmapFilenames;
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throw std::runtime_error(error.c_str());
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}
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// Free mipmap array
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delete[] mipmaps;
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// Free list of mipmap filenames
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delete mipmapFilenames;
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return texture;
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}
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