private static DDSHeader10 ReadHeader10(BinaryReader input)
{
DDSHeader10 header10 = new DDSHeader10();
header10.Exists = true;
header10.Format = ReadDXGIFormat(input);
header10.Dimension = ReadResourceDimension(input);
header10.MiscFlag = input.ReadInt32();
header10.ArraySize = input.ReadInt32();
header10.Reserved = input.ReadInt32();
return(header10);
}
private static SurfaceFormat DetermineFormat(DDSImageInfo image)
{
DDSHeader header = image.Header;
DDSHeader10 header10 = image.Header10;
int flags = header.ImageFormat.DwFlags;
bool compressedFormat = IsSet(flags, (int)DDSPixelFlags.FourCC);
bool rgb = IsSet(flags, (int)DDSPixelFlags.RGB);
bool alphaPixels = IsSet(flags, (int)DDSPixelFlags.AlphaPixels);
bool alpha = IsSet(flags, (int)DDSPixelFlags.Alpha);
bool luminance = IsSet(flags, (int)DDSPixelFlags.Luminance);
if (compressedFormat)
{
int fourCC = header.ImageFormat.DwFourCC;
if (fourCC == GetInt("DXT1"))
{
return(SurfaceFormat.DXT1);
}
else if (fourCC == GetInt("DXT3"))
{
return(SurfaceFormat.DXT3);
}
else if (fourCC == GetInt("DXT5"))
{
return(SurfaceFormat.DXT5);
}
}
else
{
if (rgb)
{
int bpp = header.ImageFormat.DwRGBBitCount;
switch (bpp)
{
case 32:
return(SurfaceFormat.Color);
}
}
else if (alphaPixels && alpha && (header.ImageFormat.DwRGBBitCount == 8))
{
return(SurfaceFormat.Alpha8);
}
}
throw new InvalidDataException("Unsupported DDS format.");
}
private static TextureDimensions DetermineTextureDimensions(DDSImageInfo image)
{
DDSHeader header = image.Header;
DDSHeader10 header10 = image.Header10;
if (IsSet(header.DwCaps2, (int)DDSCaps2.CubeMap))
{
return(TextureDimensions.Cube);
}
else if (IsSet(header.DwCaps2, (int)DDSCaps2.Volume))
{
return(TextureDimensions.Three);
}
else
{
return(TextureDimensions.Two);
}
}
