internal static DdsFormat GetDdsFormat(DdsPixelFormat ddpf)
{
if ((ddpf.Options & DdsPixelFormatOptions.Rgb) != 0)
{
switch (ddpf.RgbBitCount)
{
case 32:
if (IsBitMask(ddpf, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return(DdsFormat.R8G8B8A8UNorm);
}
if (IsBitMask(ddpf, 0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000))
{
return(DdsFormat.B8G8R8A8UNorm);
}
if (IsBitMask(ddpf, 0x00ff0000, 0x0000ff00, 0x000000ff, 0x00000000))
{
return(DdsFormat.B8G8R8X8UNorm);
}
if (IsBitMask(ddpf, 0x3ff00000, 0x000ffc00, 0x000003ff, 0xc0000000))
{
return(DdsFormat.R10G10B10A2UNorm);
}
if (IsBitMask(ddpf, 0x0000ffff, 0xffff0000, 0x00000000, 0x00000000))
{
return(DdsFormat.R16G16UNorm);
}
if (IsBitMask(ddpf, 0xffffffff, 0x00000000, 0x00000000, 0x00000000))
{
return(DdsFormat.R32Float);
}
break;
case 24:
break;
case 16:
if (IsBitMask(ddpf, 0x7c00, 0x03e0, 0x001f, 0x8000))
{
return(DdsFormat.B5G5R5A1UNorm);
}
if (IsBitMask(ddpf, 0xf800, 0x07e0, 0x001f, 0x0000))
{
return(DdsFormat.B5G6R5UNorm);
}
if (IsBitMask(ddpf, 0x0f00, 0x00f0, 0x000f, 0xf000))
{
return(DdsFormat.B4G4R4A4UNorm);
}
break;
}
}
else if ((ddpf.Options & DdsPixelFormatOptions.Luminance) != 0)
{
switch (ddpf.RgbBitCount)
{
case 16:
if (IsBitMask(ddpf, 0x0000ffff, 0x00000000, 0x00000000, 0x00000000))
{
return(DdsFormat.R16UNorm);
}
if (IsBitMask(ddpf, 0x000000ff, 0x00000000, 0x00000000, 0x0000ff00))
{
return(DdsFormat.R8G8UNorm);
}
break;
case 8:
if (IsBitMask(ddpf, 0x000000ff, 0x00000000, 0x00000000, 0x00000000))
{
return(DdsFormat.R8UNorm);
}
if (IsBitMask(ddpf, 0x000000ff, 0x00000000, 0x00000000, 0x0000ff00))
{
return(DdsFormat.R8G8UNorm);
}
break;
}
}
else if ((ddpf.Options & DdsPixelFormatOptions.Alpha) != 0)
{
if (ddpf.RgbBitCount == 8)
{
return(DdsFormat.A8UNorm);
}
}
else if ((ddpf.Options & DdsPixelFormatOptions.BumpDuDv) != 0)
{
switch (ddpf.RgbBitCount)
{
case 32:
if (IsBitMask(ddpf, 0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return(DdsFormat.R8G8B8A8SNorm);
}
if (IsBitMask(ddpf, 0x0000ffff, 0xffff0000, 0x00000000, 0x00000000))
{
return(DdsFormat.R16G16SNorm);
}
break;
case 16:
if (IsBitMask(ddpf, 0x00ff, 0xff00, 0x0000, 0x0000))
{
return(DdsFormat.R8G8SNorm);
}
break;
}
}
else if ((ddpf.Options & DdsPixelFormatOptions.FourCC) != 0)
{
switch (ddpf.FourCC)
{
case DdsFourCC.DXT1:
return(DdsFormat.BC1UNorm);
case DdsFourCC.DXT3:
return(DdsFormat.BC2UNorm);
case DdsFourCC.DXT5:
return(DdsFormat.BC3UNorm);
case DdsFourCC.DXT2:
return(DdsFormat.BC2UNorm);
case DdsFourCC.DXT4:
return(DdsFormat.BC3UNorm);
case DdsFourCC.BC4U:
return(DdsFormat.BC4UNorm);
case DdsFourCC.BC4S:
return(DdsFormat.BC4SNorm);
case DdsFourCC.BC5U:
return(DdsFormat.BC5UNorm);
case DdsFourCC.BC5S:
return(DdsFormat.BC5SNorm);
case DdsFourCC.RGBG:
return(DdsFormat.R8G8B8G8UNorm);
case DdsFourCC.GRGB:
return(DdsFormat.G8R8G8B8UNorm);
case DdsFourCC.YUY2:
return(DdsFormat.Yuy2);
case DdsFourCC.D3DFMT_A16B16G16R16:
return(DdsFormat.R16G16B16A16UNorm);
case DdsFourCC.D3DFMT_Q16W16V16U16:
return(DdsFormat.R16G16B16A16SNorm);
case DdsFourCC.D3DFMT_R16F:
return(DdsFormat.R16Float);
case DdsFourCC.D3DFMT_G16R16F:
return(DdsFormat.R16G16Float);
case DdsFourCC.D3DFMT_A16B16G16R16F:
return(DdsFormat.R16G16B16A16Float);
case DdsFourCC.D3DFMT_R32F:
return(DdsFormat.R32Float);
case DdsFourCC.D3DFMT_G32R32F:
return(DdsFormat.R32G32Float);
case DdsFourCC.D3DFMT_A32B32G32R32F:
return(DdsFormat.R32G32B32A32Float);
}
}
return(DdsFormat.Unknown);
}
private static bool IsBitMask(DdsPixelFormat ddpf, uint r, uint g, uint b, uint a)
{
return(ddpf.RedBitMask == r && ddpf.GreenBitMask == g && ddpf.BlueBitMask == b && ddpf.AlphaBitMask == a);
}
