private void WriteHeader(BinaryWriter bw)
{
var ddsHeader = new DDS_HEADER();
ddsHeader.dwSize = ddsHeader.GetSize();
ddsHeader.dwHeaderFlags = DDS.DDS_HEADER_FLAGS_TEXTURE | DDS.DDS_HEADER_FLAGS_LINEARSIZE | DDS.DDS_HEADER_FLAGS_MIPMAP;
ddsHeader.dwHeight = _height;
ddsHeader.dwWidth = _width;
ddsHeader.dwMipMapCount = _numMips;
ddsHeader.PixelFormat.dwSize = ddsHeader.PixelFormat.GetSize();
ddsHeader.dwDepth = 1;
ddsHeader.dwSurfaceFlags = DDS.DDS_SURFACE_FLAGS_TEXTURE | DDS.DDS_SURFACE_FLAGS_MIPMAP;
switch ((DXGI_FORMAT)_format)
{
case DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('D', 'X', 'T', '1');
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height / 2); // 4bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_BC2_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('D', 'X', 'T', '3');
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height); // 8bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('D', 'X', 'T', '5');
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height); // 8bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_BC5_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
if (_bsa.UseATIFourCC)
{
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('A', 'T', 'I', '2'); // this is more correct but the only thing I have found that supports it is the nvidia photoshop plugin
}
else
{
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('B', 'C', '5', 'U');
}
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height); // 8bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('D', 'X', '1', '0');
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height / 2); // 4bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_FOURCC;
ddsHeader.PixelFormat.dwFourCC = DDS.MAKEFOURCC('D', 'X', '1', '0');
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height); // 8bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_RGBA;
ddsHeader.PixelFormat.dwRGBBitCount = 32;
ddsHeader.PixelFormat.dwRBitMask = 0x000000FF;
ddsHeader.PixelFormat.dwGBitMask = 0x0000FF00;
ddsHeader.PixelFormat.dwBBitMask = 0x00FF0000;
ddsHeader.PixelFormat.dwABitMask = 0xFF000000;
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height * 4); // 32bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_B8G8R8A8_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_B8G8R8X8_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_RGBA;
ddsHeader.PixelFormat.dwRGBBitCount = 32;
ddsHeader.PixelFormat.dwRBitMask = 0x00FF0000;
ddsHeader.PixelFormat.dwGBitMask = 0x0000FF00;
ddsHeader.PixelFormat.dwBBitMask = 0x000000FF;
ddsHeader.PixelFormat.dwABitMask = 0xFF000000;
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height * 4); // 32bpp
break;
case DXGI_FORMAT.DXGI_FORMAT_R8_UNORM:
ddsHeader.PixelFormat.dwFlags = DDS.DDS_RGB;
ddsHeader.PixelFormat.dwRGBBitCount = 8;
ddsHeader.PixelFormat.dwRBitMask = 0xFF;
ddsHeader.dwPitchOrLinearSize = (uint)(_width * _height); // 8bpp
break;
default:
throw new Exception("Unsupported DDS header format. File: " + FullPath);
}
bw.Write((uint)DDS.DDS_MAGIC);
ddsHeader.Write(bw);
switch ((DXGI_FORMAT)_format)
{
case DXGI_FORMAT.DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT.DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT.DXGI_FORMAT_BC7_UNORM_SRGB:
var dxt10 = new DDS_HEADER_DXT10()
{
dxgiFormat = _format,
resourceDimension = (uint)DXT10_RESOURCE_DIMENSION.DIMENSION_TEXTURE2D,
miscFlag = 0,
arraySize = 1,
miscFlags2 = DDS.DDS_ALPHA_MODE_UNKNOWN
};
dxt10.Write(bw);
break;
}
}
