public static DDSMetadata ReadHeader(string ddsfile)
{
var metadata = new DDSMetadata();
using var fs = new FileStream(ddsfile, FileMode.Open, FileAccess.Read);
if (fs.Length < 128)
{
throw new InvalidParsingException(ddsfile);
}
using var reader = new BinaryReader(fs);
// check if DDS file
var buffer = reader.ReadBytes(4);
if (!buffer.SequenceEqual(BitConverter.GetBytes(DDS_MAGIC)))
{
return(metadata);
}
var id = reader.BaseStream.ReadStruct <DDS_HEADER>();
metadata = new DDSMetadata(id);
return(metadata);
}
public static unsafe bool TryGetMetadataFromDDSMemory(Span <byte> span, out DDSMetadata metadata)
{
try
{
var len = span.Length;
fixed(byte *ptr = span)
{
var md = DirectXTexSharp.Metadata.
GetMetadataFromDDSMemory(ptr, len, DirectXTexSharp.DDSFLAGS.DDS_FLAGS_NONE);
var bpp = DirectXTexSharp.Format.BitsPerPixel(md.format);
var iscube = md.is_cubemap();
metadata = new DDSMetadata(md, (uint)bpp, true);
}
}
catch (Exception)
{
metadata = default;
return(false);
}
return(true);
}
private static (DDS_HEADER, DDS_HEADER_DXT10) GenerateHeader(DDSMetadata metadata)
{
var height = metadata.Height;
var width = metadata.Width;
var mipscount = metadata.Mipscount;
var iscubemap = metadata.Iscubemap;
var format = metadata.Format;
bool dxt10 = /*metadata.Format == EFormat.BC7_UNORM;*/ metadata.Dx10; //TODO
// for BC7_UNORM, R8_UINT
var ddspf = new DDS_PIXELFORMAT()
{
dwSize = PIXELFORMAT_SIZE,
dwFlags = 0,
dwFourCC = 0,
dwRGBBitCount = 0,
dwRBitMask = 0,
dwGBitMask = 0,
dwBBitMask = 0,
dwABitMask = 0
};
var header = new DDS_HEADER()
{
dwSize = HEADER_SIZE,
dwFlags = DDS_HEADER_FLAGS_TEXTURE,
dwHeight = height,
dwWidth = width,
dwPitchOrLinearSize = 0,
dwDepth = 0,
dwMipMapCount = 0,
dwReserved1 = 0,
dwReserved2 = 0,
dwReserved3 = 0,
dwReserved4 = 0,
dwReserved5 = 0,
dwReserved6 = 0,
dwReserved7 = 0,
dwReserved8 = 0,
dwReserved9 = 0,
dwReserved10 = 0,
dwReserved11 = 0,
ddspf = ddspf,
dwCaps = DDSCAPS_TEXTURE,
dwCaps2 = 0,
dwCaps3 = 0,
dwCaps4 = 0,
dwReserved12 = 0,
};
var dx10header = new DDS_HEADER_DXT10()
{
dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM,
resourceDimension = D3D10_RESOURCE_DIMENSION.D3D10_RESOURCE_DIMENSION_TEXTURE2D,
miscFlag = 0,
arraySize = metadata.Slicecount,
miscFlags2 = 0
};
if (mipscount > 0)
{
header.dwMipMapCount = mipscount;
}
// pixelformat
{
// dwFourCC
if (dxt10)
{
ddspf.dwFourCC = MAKEFOURCC('D', 'X', '1', '0');
}
else
{
switch (format)
{
case EFormat.R32G32B32A32_FLOAT:
ddspf.dwFourCC = 116;
break;
case EFormat.R16G16B16A16_FLOAT:
ddspf.dwFourCC = 113;
break;
case EFormat.R10G10B10A2_UNORM:
throw new NotImplementedException();
case EFormat.R32_UINT:
throw new NotImplementedException();
case EFormat.R8G8_UNORM:
SetPixelmask(DDSPF_A8L8, ref ddspf);
break;
case EFormat.R16_FLOAT:
ddspf.dwFourCC = 111;
break;
case EFormat.R8_UNORM:
case EFormat.R8_UINT:
SetPixelmask(DDSPF_L8, ref ddspf);
break;
case EFormat.A8_UNORM:
SetPixelmask(DDSPF_A8, ref ddspf);
break;
case EFormat.R8G8B8A8_UNORM:
SetPixelmask(DDSPF_A8R8G8B8, ref ddspf);
break;
case EFormat.BC1_UNORM:
ddspf.dwFourCC = MAKEFOURCC('D', 'X', 'T', '1');
break;
case EFormat.BC2_UNORM:
ddspf.dwFourCC = MAKEFOURCC('D', 'X', 'T', '3');
break;
case EFormat.BC3_UNORM:
ddspf.dwFourCC = MAKEFOURCC('D', 'X', 'T', '5');
break;
case EFormat.BC4_UNORM:
ddspf.dwFourCC = MAKEFOURCC('B', 'C', '4', 'U');
break;
case EFormat.BC5_UNORM:
ddspf.dwFourCC = MAKEFOURCC('B', 'C', '5', 'U');
break;
case EFormat.BC7_UNORM:
dxt10 = true;
break;
default:
throw new MissingFormatException($"Missing format: {format}");
}
}
// dwflags
if (ddspf.dwABitMask != 0) // check this
{
ddspf.dwFlags |= DDPF_ALPHAPIXELS;
}
/*if (ddspf.dwABitMask != 0)
* ddspf.dwFlags |= DDPF_ALPHA;*///old
if (ddspf.dwFourCC != 0)
{
ddspf.dwFlags |= DDPF_FOURCC;
}
if (ddspf.dwRGBBitCount != 0 && ddspf.dwRBitMask != 0 && ddspf.dwGBitMask != 0 && ddspf.dwBBitMask != 0)
{
ddspf.dwFlags |= DDPF_RGB;
}
if (ddspf.dwRBitMask != 0 && ddspf.dwGBitMask == 0 && ddspf.dwBBitMask == 0 && ddspf.dwABitMask == 0)
{
ddspf.dwFlags |= DDPF_LUMINANCE;
}
header.ddspf = ddspf;
}
// dwPitchOrLinearSize
uint p = 0;
var bpp = ddspf.dwRGBBitCount;
switch (format)
{
case EFormat.R8_UNORM:
header.dwPitchOrLinearSize = (width * bpp + 7) / 8;
break;
case EFormat.R32G32B32A32_FLOAT:
case EFormat.R16G16B16A16_FLOAT:
case EFormat.R10G10B10A2_UNORM:
case EFormat.R32_UINT:
case EFormat.R8_UINT:
case EFormat.R8G8_UNORM:
case EFormat.R16_FLOAT:
case EFormat.A8_UNORM:
case EFormat.R8G8B8A8_UNORM:
header.dwPitchOrLinearSize = (width * bpp + 7) / 8;
header.dwFlags |= DDSD_PITCH;
break;
case EFormat.BC1_UNORM:
case EFormat.BC4_UNORM:
p = width * height / 2; //max(1,width ?4)x max(1,height ?4)x 8 (DXT1)
header.dwPitchOrLinearSize = (uint)(p);
header.dwFlags |= DDSD_LINEARSIZE;
break;
case EFormat.BC2_UNORM:
case EFormat.BC3_UNORM:
case EFormat.BC5_UNORM:
case EFormat.BC7_UNORM:
p = width * height; //max(1,width ?4)x max(1,height ?4)x 16 (DXT2-5)
header.dwPitchOrLinearSize = (uint)(p);
header.dwFlags |= DDSD_LINEARSIZE;
break;
default:
throw new MissingFormatException($"Missing format: {format}");
}
// unused R8G8_B8G8, G8R8_G8B8, legacy UYVY-packed, and legacy YUY2-packed formats,
// header.dwPitchOrLinearSize = ((width + 1) >> 1) * 4;
// depth
//if (slicecount > 0 && !iscubemap)
// header.dwDepth = slicecount;
// caps
if (iscubemap || mipscount > 0)
{
header.dwCaps |= DDSCAPS_COMPLEX;
}
if (mipscount > 0)
{
header.dwCaps |= DDSCAPS_MIPMAP;
}
// caps2
if (iscubemap)
{
header.dwCaps2 |= DDSCAPS2_CUBEMAP_ALL_FACES | DDSCAPS2_CUBEMAP;
}
//if (slicecount > 0)
// header.dwCaps2 |= DDSCAPS2_VOLUME;
// flags
//if (slicecount > 0)
// header.dwFlags |= DDSD_DEPTH;
if (mipscount > 0)
{
header.dwFlags |= DDSD_MIPMAPCOUNT;
}
// DXT10
if (dxt10)
{
// dxgiFormat
switch (format)
{
case EFormat.R32G32B32A32_FLOAT:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R32G32B32A32_FLOAT;
break;
case EFormat.R16G16B16A16_FLOAT:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R16G16B16A16_FLOAT;
break;
case EFormat.R10G10B10A2_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R10G10B10A2_UNORM;
break;
case EFormat.R8G8B8A8_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM;
break;
case EFormat.R32_UINT:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R32_UINT;
break;
case EFormat.R8G8_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R8G8_UNORM;
break;
case EFormat.R16_FLOAT:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R16_FLOAT;
break;
case EFormat.R8_UINT:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R8_UINT;
break;
case EFormat.R8_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_R8_UNORM;
break;
case EFormat.A8_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_A8_UNORM;
break;
case EFormat.BC1_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM;
break;
case EFormat.BC2_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM;
break;
case EFormat.BC3_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM;
break;
case EFormat.BC4_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM;
break;
case EFormat.BC7_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM;
break;
case EFormat.BC5_UNORM:
dx10header.dxgiFormat = DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM;
break;
default:
{
throw new MissingFormatException($"Missing format: {format}");
}
}
// resourceDimension
//if (slicecount > 0)
// dxt10header.resourceDimension = D3D10_RESOURCE_DIMENSION.D3D10_RESOURCE_DIMENSION_TEXTURE3D;
//misc flag
//if (iscubemap)
// dxt10header.miscFlag |= DDS_RESOURCE_MISC_TEXTURECUBE;
//if (mipscount > 0)
// dxt10header.miscFlag |= D3D10_RESOURCE_MISC_GENERATE_MIPS;
// array size
//if (iscubemap)
// dxt10header.arraySize = metadata.Slicecount;
// miscFlags2
}
return(header, dx10header);
}
public static void GenerateAndWriteHeader(Stream stream, DDSMetadata metadata)
{
var(header, dxt10header) = GenerateHeader(metadata);
WriteHeader(stream, header, dxt10header);
}