in MiniEngine/Core/DDSTextureLoader.cpp [445:653]
static DXGI_FORMAT GetDXGIFormat( const DDS_PIXELFORMAT& ddpf )
{
if (ddpf.flags & DDS_RGB)
{
// Note that sRGB formats are written using the "DX10" extended header
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff,0x0000ff00,0x00ff0000,0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_UNORM;
}
if (ISBITMASK(0x00ff0000,0x0000ff00,0x000000ff,0xff000000))
{
return DXGI_FORMAT_B8G8R8A8_UNORM;
}
if (ISBITMASK(0x00ff0000,0x0000ff00,0x000000ff,0x00000000))
{
return DXGI_FORMAT_B8G8R8X8_UNORM;
}
// No DXGI format maps to ISBITMASK(0x000000ff,0x0000ff00,0x00ff0000,0x00000000) aka D3DFMT_X8B8G8R8
// Note that many common DDS reader/writers (including D3DX) swap the
// the RED/BLUE masks for 10:10:10:2 formats. We assumme
// below that the 'backwards' header mask is being used since it is most
// likely written by D3DX. The more robust solution is to use the 'DX10'
// header extension and specify the DXGI_FORMAT_R10G10B10A2_UNORM format directly
// For 'correct' writers, this should be 0x000003ff,0x000ffc00,0x3ff00000 for RGB data
if (ISBITMASK(0x3ff00000,0x000ffc00,0x000003ff,0xc0000000))
{
return DXGI_FORMAT_R10G10B10A2_UNORM;
}
// No DXGI format maps to ISBITMASK(0x000003ff,0x000ffc00,0x3ff00000,0xc0000000) aka D3DFMT_A2R10G10B10
if (ISBITMASK(0x0000ffff,0xffff0000,0x00000000,0x00000000))
{
return DXGI_FORMAT_R16G16_UNORM;
}
if (ISBITMASK(0xffffffff,0x00000000,0x00000000,0x00000000))
{
// Only 32-bit color channel format in D3D9 was R32F
return DXGI_FORMAT_R32_FLOAT; // D3DX writes this out as a FourCC of 114
}
break;
case 24:
// No 24bpp DXGI formats aka D3DFMT_R8G8B8
break;
case 16:
if (ISBITMASK(0x7c00,0x03e0,0x001f,0x8000))
{
return DXGI_FORMAT_B5G5R5A1_UNORM;
}
if (ISBITMASK(0xf800,0x07e0,0x001f,0x0000))
{
return DXGI_FORMAT_B5G6R5_UNORM;
}
// No DXGI format maps to ISBITMASK(0x7c00,0x03e0,0x001f,0x0000) aka D3DFMT_X1R5G5B5
if (ISBITMASK(0x0f00,0x00f0,0x000f,0xf000))
{
return DXGI_FORMAT_B4G4R4A4_UNORM;
}
// No DXGI format maps to ISBITMASK(0x0f00,0x00f0,0x000f,0x0000) aka D3DFMT_X4R4G4B4
// No 3:3:2, 3:3:2:8, or paletted DXGI formats aka D3DFMT_A8R3G3B2, D3DFMT_R3G3B2, D3DFMT_P8, D3DFMT_A8P8, etc.
break;
}
}
else if (ddpf.flags & DDS_LUMINANCE)
{
if (8 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x000000ff,0x00000000,0x00000000,0x00000000))
{
return DXGI_FORMAT_R8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
// No DXGI format maps to ISBITMASK(0x0f,0x00,0x00,0xf0) aka D3DFMT_A4L4
}
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x0000ffff,0x00000000,0x00000000,0x00000000))
{
return DXGI_FORMAT_R16_UNORM; // D3DX10/11 writes this out as DX10 extension
}
if (ISBITMASK(0x000000ff,0x00000000,0x00000000,0x0000ff00))
{
return DXGI_FORMAT_R8G8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
}
}
else if (ddpf.flags & DDS_ALPHA)
{
if (8 == ddpf.RGBBitCount)
{
return DXGI_FORMAT_A8_UNORM;
}
}
else if (ddpf.flags & DDS_FOURCC)
{
if (MAKEFOURCC( 'D', 'X', 'T', '1' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC1_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '3' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC2_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '5' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC3_UNORM;
}
// While pre-mulitplied alpha isn't directly supported by the DXGI formats,
// they are basically the same as these BC formats so they can be mapped
if (MAKEFOURCC( 'D', 'X', 'T', '2' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC2_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '4' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC3_UNORM;
}
if (MAKEFOURCC( 'A', 'T', 'I', '1' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '4', 'U' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '4', 'S' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_SNORM;
}
if (MAKEFOURCC( 'A', 'T', 'I', '2' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC5_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '5', 'U' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC5_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '5', 'S' ) == ddpf.fourCC)
{
return DXGI_FORMAT_BC5_SNORM;
}
// BC6H and BC7 are written using the "DX10" extended header
if (MAKEFOURCC( 'R', 'G', 'B', 'G' ) == ddpf.fourCC)
{
return DXGI_FORMAT_R8G8_B8G8_UNORM;
}
if (MAKEFOURCC( 'G', 'R', 'G', 'B' ) == ddpf.fourCC)
{
return DXGI_FORMAT_G8R8_G8B8_UNORM;
}
if (MAKEFOURCC('Y','U','Y','2') == ddpf.fourCC)
{
return DXGI_FORMAT_YUY2;
}
// Check for D3DFORMAT enums being set here
switch( ddpf.fourCC )
{
case 36: // D3DFMT_A16B16G16R16
return DXGI_FORMAT_R16G16B16A16_UNORM;
case 110: // D3DFMT_Q16W16V16U16
return DXGI_FORMAT_R16G16B16A16_SNORM;
case 111: // D3DFMT_R16F
return DXGI_FORMAT_R16_FLOAT;
case 112: // D3DFMT_G16R16F
return DXGI_FORMAT_R16G16_FLOAT;
case 113: // D3DFMT_A16B16G16R16F
return DXGI_FORMAT_R16G16B16A16_FLOAT;
case 114: // D3DFMT_R32F
return DXGI_FORMAT_R32_FLOAT;
case 115: // D3DFMT_G32R32F
return DXGI_FORMAT_R32G32_FLOAT;
case 116: // D3DFMT_A32B32G32R32F
return DXGI_FORMAT_R32G32B32A32_FLOAT;
}
}
return DXGI_FORMAT_UNKNOWN;
}