73 lines
2.2 KiB
C++
73 lines
2.2 KiB
C++
#include "Images.hpp"
|
|
|
|
using namespace render;
|
|
|
|
std::unique_ptr<Texture> (*Texture::loadFunc)(const std::string&, const sampling&) = nullptr;
|
|
std::unique_ptr<TextureCube> (*TextureCube::loadFunc)(const std::array<std::string, 6>&, const Texture::sampling &) = nullptr;
|
|
std::unique_ptr<TextureArray> (*TextureArray::loadFunc)(const std::vector<std::string>&, const Texture::sampling &) = nullptr;
|
|
|
|
#include <stdio.h>
|
|
#include <string.h>
|
|
#include <string>
|
|
|
|
#define FOURCC_DXT1 0x31545844 // Equivalent to "DXT1" in ASCII
|
|
#define FOURCC_DXT3 0x33545844 // Equivalent to "DXT3" in ASCII
|
|
#define FOURCC_DXT5 0x35545844 // Equivalent to "DXT5" in ASCII
|
|
|
|
std::optional<Image::properties> Image::Read(const std::string& imagepath, std::vector<unsigned char>& data, bool srgb) {
|
|
|
|
unsigned char header[124];
|
|
properties info;
|
|
|
|
FILE *fp;
|
|
|
|
/* try to open the file */
|
|
fp = fopen(imagepath.c_str(), "rb");
|
|
if (fp == NULL){
|
|
printf("%s could not be opened.\n", imagepath.c_str()); getchar();
|
|
return {};
|
|
}
|
|
|
|
/* verify the type of file */
|
|
char filecode[4];
|
|
fread(filecode, 1, 4, fp);
|
|
if (strncmp(filecode, "DDS ", 4) != 0) {
|
|
fclose(fp);
|
|
return {};
|
|
}
|
|
|
|
/* get the surface desc */
|
|
fread(&header, 124, 1, fp);
|
|
|
|
info.size.height = *(unsigned int*)&(header[8 ]);
|
|
info.size.width = *(unsigned int*)&(header[12]);
|
|
unsigned int linearSize = *(unsigned int*)&(header[16]);
|
|
info.mipmapLevels = *(unsigned int*)&(header[24]);
|
|
unsigned int fourCC = *(unsigned int*)&(header[80]);
|
|
|
|
|
|
/* how big is it going to be including all mipmaps? */
|
|
unsigned int bufsize = info.mipmapLevels > 1 ? linearSize * 2 : linearSize;
|
|
data.resize(bufsize);
|
|
fread(data.data(), 1, bufsize, fp);
|
|
/* close the file pointer */
|
|
fclose(fp);
|
|
|
|
switch(fourCC)
|
|
{
|
|
case FOURCC_DXT3:
|
|
info.format = srgb ? Format::BC2 : Format::BC2_UNORM;
|
|
break;
|
|
case FOURCC_DXT5:
|
|
info.format = srgb ? Format::BC3 : Format::BC3_UNORM;
|
|
break;
|
|
//MAYBE: VK_FORMAT_BC6H_SFLOAT_BLOCK
|
|
default:
|
|
return {};
|
|
}
|
|
//FIXME: miplevels with size < block size (2 last) are corrupted
|
|
const uint32_t maxMipmapLevels = 1 + std::floor(std::log2(std::max(info.size.height, info.size.width))) - 2;
|
|
info.mipmapLevels = std::min(maxMipmapLevels, info.mipmapLevels);
|
|
|
|
return info;
|
|
} |