💿🐜 Antkeeper source code
https://antkeeper.com
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78 lines
2.2 KiB
78 lines
2.2 KiB
/*
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* Copyright (C) 2020 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 "stb/stb_image.h"
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#include "resources/image.hpp"
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#include <cstring>
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#include <stdexcept>
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#include <physfs.h>
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template <>
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image* resource_loader<image>::load(resource_manager* resource_manager, PHYSFS_File* file)
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{
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unsigned char* buffer;
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int size;
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int width;
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int height;
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int channels;
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bool hdr;
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void* pixels;
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// Read input stream into buffer
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size = static_cast<int>(PHYSFS_fileLength(file));
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buffer = new unsigned char[size];
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PHYSFS_readBytes(file, buffer, size);
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// Determine if image is in an HDR format
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hdr = (stbi_is_hdr_from_memory(buffer, size) != 0);
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// Set vertical flip on load in order to upload pixels correctly to OpenGL
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stbi_set_flip_vertically_on_load(true);
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// Load image data
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if (hdr)
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{
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pixels = stbi_loadf_from_memory(buffer, size, &width, &height, &channels, 0);
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}
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else
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{
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pixels = stbi_load_from_memory(buffer, size, &width, &height, &channels, 0);
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}
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// Free file buffer
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delete[] buffer;
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// Check if image was loaded
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if (!pixels)
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{
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throw std::runtime_error("STBI failed to load image from memory.");
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}
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::image* image = new ::image();
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image->format(static_cast<unsigned int>(channels), hdr);
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image->resize(static_cast<unsigned int>(width), static_cast<unsigned int>(height));
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std::memcpy(image->get_pixels(), pixels, width * height * channels * ((hdr) ? sizeof(float) : sizeof(unsigned char)));
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// Free loaded image data
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stbi_image_free(pixels);
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return image;
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}
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