68 lines
1.6 KiB
C++
68 lines
1.6 KiB
C++
#include "Images.hpp"
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using namespace render;
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std::unique_ptr<Texture> (*Texture::loadFunc)(const std::string&, const sampling&) = nullptr;
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#include <stdio.h>
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#include <string.h>
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#include <string>
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#define FOURCC_DXT1 0x31545844 // Equivalent to "DXT1" in ASCII
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#define FOURCC_DXT3 0x33545844 // Equivalent to "DXT3" in ASCII
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#define FOURCC_DXT5 0x35545844 // Equivalent to "DXT5" in ASCII
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std::optional<Image::properties> Image::Read(const std::string& imagepath, std::vector<unsigned char>& data) {
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unsigned char header[124];
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properties info;
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FILE *fp;
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/* try to open the file */
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fp = fopen(imagepath.c_str(), "rb");
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if (fp == NULL){
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printf("%s could not be opened.\n", imagepath.c_str()); getchar();
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return {};
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}
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/* verify the type of file */
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char filecode[4];
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fread(filecode, 1, 4, fp);
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if (strncmp(filecode, "DDS ", 4) != 0) {
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fclose(fp);
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return {};
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}
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/* get the surface desc */
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fread(&header, 124, 1, fp);
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info.size.height = *(unsigned int*)&(header[8 ]);
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info.size.width = *(unsigned int*)&(header[12]);
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unsigned int linearSize = *(unsigned int*)&(header[16]);
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info.mipmapLevels = *(unsigned int*)&(header[24]);
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unsigned int fourCC = *(unsigned int*)&(header[80]);
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/* how big is it going to be including all mipmaps? */
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unsigned int bufsize = info.mipmapLevels > 1 ? linearSize * 2 : linearSize;
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data.resize(bufsize);
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fread(data.data(), 1, bufsize, fp);
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/* close the file pointer */
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fclose(fp);
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switch(fourCC)
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{
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case FOURCC_DXT3:
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info.format = Format::BC2;
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break;
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case FOURCC_DXT5:
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info.format = Format::BC3;
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break;
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//MAYBE: VK_FORMAT_BC6H_SFLOAT_BLOCK
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default:
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return {};
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}
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return info;
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} |