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NVTT 1.x wrote L8/L16 as RGB instead of LUMINANCE

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This commit is contained in:
Chuck Walbourn 2021-04-02 17:08:56 -07:00
parent d13f66af05
commit 5f22c7cc39
5 changed files with 178 additions and 120 deletions
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73
DDSTextureLoader/DDSTextureLoader11.cpp
View File

@ -122,7 +122,7 @@ namespace
using ScopedHandle = std::unique_ptr<void, handle_closer>;
inline HANDLE safe_handle( HANDLE h ) noexcept { return (h == INVALID_HANDLE_VALUE) ? nullptr : h; }
inline HANDLE safe_handle(HANDLE h) noexcept { return (h == INVALID_HANDLE_VALUE) ? nullptr : h; }
template<UINT TNameLength>
inline void SetDebugObjectName(_In_ ID3D11DeviceChild* resource, _In_ const char (&name)[TNameLength]) noexcept
@ -701,36 +701,37 @@ namespace
return DXGI_FORMAT_B4G4R4A4_UNORM;
}
// NVTT versions 1.x wrote this as RGB instead of LUMINANCE
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // NVTT versions 1.x wrote this as RGB instead of LUMINANCE
return DXGI_FORMAT_R8G8_UNORM;
}
if (ISBITMASK(0xffff, 0, 0, 0))
{
return DXGI_FORMAT_R16_UNORM;
}
// No DXGI format maps to ISBITMASK(0x0f00,0x00f0,0x000f,0) 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.
// No 3:3:2:8 or paletted DXGI formats aka D3DFMT_A8R3G3B2, D3DFMT_A8P8, etc.
break;
case 8:
// NVTT versions 1.x wrote this as RGB instead of LUMINANCE
if (ISBITMASK(0xff, 0, 0, 0))
{
return DXGI_FORMAT_R8_UNORM;
}
// No 3:3:2 or paletted DXGI formats aka D3DFMT_R3G3B2, D3DFMT_P8
break;
}
}
else if (ddpf.flags & DDS_LUMINANCE)
{
if (8 == ddpf.RGBBitCount)
{
if (ISBITMASK(0xff, 0, 0, 0))
{
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 (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // Some DDS writers assume the bitcount should be 8 instead of 16
}
}
if (16 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 16:
if (ISBITMASK(0xffff, 0, 0, 0))
{
return DXGI_FORMAT_R16_UNORM; // D3DX10/11 writes this out as DX10 extension
@ -739,6 +740,21 @@ namespace
{
return DXGI_FORMAT_R8G8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
case 8:
if (ISBITMASK(0xff, 0, 0, 0))
{
return DXGI_FORMAT_R8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
// No DXGI format maps to ISBITMASK(0x0f,0,0,0xf0) aka D3DFMT_A4L4
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // Some DDS writers assume the bitcount should be 8 instead of 16
}
break;
}
}
else if (ddpf.flags & DDS_ALPHA)
@ -750,16 +766,9 @@ namespace
}
else if (ddpf.flags & DDS_BUMPDUDV)
{
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
}
if (32 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_SNORM; // D3DX10/11 writes this out as DX10 extension
@ -770,6 +779,14 @@ namespace
}
// No DXGI format maps to ISBITMASK(0x3ff00000, 0x000ffc00, 0x000003ff, 0xc0000000) aka D3DFMT_A2W10V10U10
break;
case 16:
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
}
// No DXGI format maps to DDPF_BUMPLUMINANCE aka D3DFMT_L6V5U5, D3DFMT_X8L8V8U8

127
DDSTextureLoader/DDSTextureLoader12.cpp
View File

@ -49,7 +49,7 @@ using namespace DirectX;
// Macros
//--------------------------------------------------------------------------------------
#ifndef MAKEFOURCC
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
#define MAKEFOURCC(ch0, ch1, ch2, ch3) \
((uint32_t)(uint8_t)(ch0) | ((uint32_t)(uint8_t)(ch1) << 8) | \
((uint32_t)(uint8_t)(ch2) << 16) | ((uint32_t)(uint8_t)(ch3) << 24 ))
#endif /* defined(MAKEFOURCC) */
@ -407,9 +407,9 @@ namespace
//--------------------------------------------------------------------------------------
// Return the BPP for a particular format
//--------------------------------------------------------------------------------------
size_t BitsPerPixel( _In_ DXGI_FORMAT fmt ) noexcept
size_t BitsPerPixel(_In_ DXGI_FORMAT fmt) noexcept
{
switch( fmt )
switch (fmt)
{
case DXGI_FORMAT_R32G32B32A32_TYPELESS:
case DXGI_FORMAT_R32G32B32A32_FLOAT:
@ -708,7 +708,7 @@ namespace
//--------------------------------------------------------------------------------------
#define ISBITMASK( r,g,b,a ) ( ddpf.RBitMask == r && ddpf.GBitMask == g && ddpf.BBitMask == b && ddpf.ABitMask == a )
DXGI_FORMAT GetDXGIFormat( const DDS_PIXELFORMAT& ddpf ) noexcept
DXGI_FORMAT GetDXGIFormat(const DDS_PIXELFORMAT& ddpf) noexcept
{
if (ddpf.flags & DDS_RGB)
{
@ -717,17 +717,17 @@ namespace
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff,0x0000ff00,0x00ff0000,0xff000000))
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_UNORM;
}
if (ISBITMASK(0x00ff0000,0x0000ff00,0x000000ff,0xff000000))
if (ISBITMASK(0x00ff0000, 0x0000ff00, 0x000000ff, 0xff000000))
{
return DXGI_FORMAT_B8G8R8A8_UNORM;
}
if (ISBITMASK(0x00ff0000,0x0000ff00,0x000000ff,0))
if (ISBITMASK(0x00ff0000, 0x0000ff00, 0x000000ff, 0))
{
return DXGI_FORMAT_B8G8R8X8_UNORM;
}
@ -741,19 +741,19 @@ namespace
// 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))
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,0xffff0000,0,0))
if (ISBITMASK(0x0000ffff, 0xffff0000, 0, 0))
{
return DXGI_FORMAT_R16G16_UNORM;
}
if (ISBITMASK(0xffffffff,0,0,0))
if (ISBITMASK(0xffffffff, 0, 0, 0))
{
// Only 32-bit color channel format in D3D9 was R32F
return DXGI_FORMAT_R32_FLOAT; // D3DX writes this out as a FourCC of 114
@ -765,38 +765,65 @@ namespace
break;
case 16:
if (ISBITMASK(0x7c00,0x03e0,0x001f,0x8000))
if (ISBITMASK(0x7c00, 0x03e0, 0x001f, 0x8000))
{
return DXGI_FORMAT_B5G5R5A1_UNORM;
}
if (ISBITMASK(0xf800,0x07e0,0x001f,0))
if (ISBITMASK(0xf800, 0x07e0, 0x001f, 0))
{
return DXGI_FORMAT_B5G6R5_UNORM;
}
// No DXGI format maps to ISBITMASK(0x7c00,0x03e0,0x001f,0) aka D3DFMT_X1R5G5B5
if (ISBITMASK(0x0f00,0x00f0,0x000f,0xf000))
if (ISBITMASK(0x0f00, 0x00f0, 0x000f, 0xf000))
{
return DXGI_FORMAT_B4G4R4A4_UNORM;
}
// NVTT versions 1.x wrote this as RGB instead of LUMINANCE
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // NVTT versions 1.x wrote this as RGB instead of LUMINANCE
return DXGI_FORMAT_R8G8_UNORM;
}
if (ISBITMASK(0xffff, 0, 0, 0))
{
return DXGI_FORMAT_R16_UNORM;
}
// No DXGI format maps to ISBITMASK(0x0f00,0x00f0,0x000f,0) 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.
// No 3:3:2:8 or paletted DXGI formats aka D3DFMT_A8R3G3B2, D3DFMT_A8P8, etc.
break;
case 8:
// NVTT versions 1.x wrote this as RGB instead of LUMINANCE
if (ISBITMASK(0xff, 0, 0, 0))
{
return DXGI_FORMAT_R8_UNORM;
}
// No 3:3:2 or paletted DXGI formats aka D3DFMT_R3G3B2, D3DFMT_P8
break;
}
}
else if (ddpf.flags & DDS_LUMINANCE)
{
if (8 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
if (ISBITMASK(0xff,0,0,0))
case 16:
if (ISBITMASK(0xffff, 0, 0, 0))
{
return DXGI_FORMAT_R16_UNORM; // D3DX10/11 writes this out as DX10 extension
}
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
case 8:
if (ISBITMASK(0xff, 0, 0, 0))
{
return DXGI_FORMAT_R8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
@ -807,18 +834,7 @@ namespace
{
return DXGI_FORMAT_R8G8_UNORM; // Some DDS writers assume the bitcount should be 8 instead of 16
}
}
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0xffff,0,0,0))
{
return DXGI_FORMAT_R16_UNORM; // D3DX10/11 writes this out as DX10 extension
}
if (ISBITMASK(0x00ff,0,0,0xff00))
{
return DXGI_FORMAT_R8G8_UNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
}
}
else if (ddpf.flags & DDS_ALPHA)
@ -830,16 +846,9 @@ namespace
}
else if (ddpf.flags & DDS_BUMPDUDV)
{
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
}
if (32 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_SNORM; // D3DX10/11 writes this out as DX10 extension
@ -850,80 +859,88 @@ namespace
}
// No DXGI format maps to ISBITMASK(0x3ff00000, 0x000ffc00, 0x000003ff, 0xc0000000) aka D3DFMT_A2W10V10U10
break;
case 16:
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
}
// No DXGI format maps to DDPF_BUMPLUMINANCE aka D3DFMT_L6V5U5, D3DFMT_X8L8V8U8
}
else if (ddpf.flags & DDS_FOURCC)
{
if (MAKEFOURCC( 'D', 'X', 'T', '1' ) == ddpf.fourCC)
if (MAKEFOURCC('D', 'X', 'T', '1') == ddpf.fourCC)
{
return DXGI_FORMAT_BC1_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '3' ) == ddpf.fourCC)
if (MAKEFOURCC('D', 'X', 'T', '3') == ddpf.fourCC)
{
return DXGI_FORMAT_BC2_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '5' ) == ddpf.fourCC)
if (MAKEFOURCC('D', 'X', 'T', '5') == ddpf.fourCC)
{
return DXGI_FORMAT_BC3_UNORM;
}
// While pre-multiplied 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)
if (MAKEFOURCC('D', 'X', 'T', '2') == ddpf.fourCC)
{
return DXGI_FORMAT_BC2_UNORM;
}
if (MAKEFOURCC( 'D', 'X', 'T', '4' ) == ddpf.fourCC)
if (MAKEFOURCC('D', 'X', 'T', '4') == ddpf.fourCC)
{
return DXGI_FORMAT_BC3_UNORM;
}
if (MAKEFOURCC( 'A', 'T', 'I', '1' ) == ddpf.fourCC)
if (MAKEFOURCC('A', 'T', 'I', '1') == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '4', 'U' ) == ddpf.fourCC)
if (MAKEFOURCC('B', 'C', '4', 'U') == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '4', 'S' ) == ddpf.fourCC)
if (MAKEFOURCC('B', 'C', '4', 'S') == ddpf.fourCC)
{
return DXGI_FORMAT_BC4_SNORM;
}
if (MAKEFOURCC( 'A', 'T', 'I', '2' ) == ddpf.fourCC)
if (MAKEFOURCC('A', 'T', 'I', '2') == ddpf.fourCC)
{
return DXGI_FORMAT_BC5_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '5', 'U' ) == ddpf.fourCC)
if (MAKEFOURCC('B', 'C', '5', 'U') == ddpf.fourCC)
{
return DXGI_FORMAT_BC5_UNORM;
}
if (MAKEFOURCC( 'B', 'C', '5', 'S' ) == ddpf.fourCC)
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)
if (MAKEFOURCC('R', 'G', 'B', 'G') == ddpf.fourCC)
{
return DXGI_FORMAT_R8G8_B8G8_UNORM;
}
if (MAKEFOURCC( 'G', 'R', 'G', 'B' ) == ddpf.fourCC)
if (MAKEFOURCC('G', 'R', 'G', 'B') == ddpf.fourCC)
{
return DXGI_FORMAT_G8R8_G8B8_UNORM;
}
if (MAKEFOURCC('Y','U','Y','2') == ddpf.fourCC)
if (MAKEFOURCC('Y', 'U', 'Y', '2') == ddpf.fourCC)
{
return DXGI_FORMAT_YUY2;
}
// Check for D3DFORMAT enums being set here
switch( ddpf.fourCC )
switch (ddpf.fourCC)
{
case 36: // D3DFMT_A16B16G16R16
return DXGI_FORMAT_R16G16B16A16_UNORM;
@ -960,9 +977,9 @@ namespace
//--------------------------------------------------------------------------------------
DXGI_FORMAT MakeSRGB( _In_ DXGI_FORMAT format ) noexcept
DXGI_FORMAT MakeSRGB(_In_ DXGI_FORMAT format) noexcept
{
switch( format )
switch (format)
{
case DXGI_FORMAT_R8G8B8A8_UNORM:
return DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;

80
DDSTextureLoader/DDSTextureLoader9.cpp
View File

@ -585,9 +585,15 @@ namespace
{
return D3DFMT_A8R3G3B2;
}
// NVTT versions 1.x wrote these as RGB instead of LUMINANCE
if (ISBITMASK(0xffff, 0, 0, 0))
{
return D3DFMT_L16;
}
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return D3DFMT_A8L8; // NVTT versions 1.x wrote this as RGB instead of LUMINANCE
return D3DFMT_A8L8;
}
break;
@ -597,14 +603,32 @@ namespace
return D3DFMT_R3G3B2;
}
// NVTT versions 1.x wrote these as RGB instead of LUMINANCE
if (ISBITMASK(0xff, 0, 0, 0))
{
return D3DFMT_L8;
}
// Paletted texture formats are typically not supported on modern video cards aka D3DFMT_P8, D3DFMT_A8P8
break;
}
}
else if (ddpf.flags & DDS_LUMINANCE)
{
if (8 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 16:
if (ISBITMASK(0xffff, 0, 0, 0))
{
return D3DFMT_L16;
}
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return D3DFMT_A8L8;
}
break;
case 8:
if (ISBITMASK(0x0f, 0, 0, 0xf0))
{
return D3DFMT_A4L4;
@ -617,19 +641,7 @@ namespace
{
return D3DFMT_A8L8; // Some DDS writers assume the bitcount should be 8 instead of 16
}
}
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0xffff, 0, 0, 0))
{
return D3DFMT_L16;
}
if (ISBITMASK(0x00ff, 0, 0, 0xff00))
{
return D3DFMT_A8L8;
}
break;
}
}
else if (ddpf.flags & DDS_ALPHA)
@ -641,16 +653,9 @@ namespace
}
else if (ddpf.flags & DDS_BUMPDUDV)
{
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return D3DFMT_V8U8;
}
}
if (32 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return D3DFMT_Q8W8V8U8;
@ -663,24 +668,33 @@ namespace
{
return D3DFMT_A2W10V10U10;
}
break;
case 16:
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return D3DFMT_V8U8;
}
break;
}
}
else if (ddpf.flags & DDS_BUMPLUMINANCE)
{
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x001f, 0x03e0, 0xfc00, 0))
{
return D3DFMT_L6V5U5;
}
}
if (32 == ddpf.RGBBitCount)
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0))
{
return D3DFMT_X8L8V8U8;
}
break;
case 16:
if (ISBITMASK(0x001f, 0x03e0, 0xfc00, 0))
{
return D3DFMT_L6V5U5;
}
break;
}
}
else if (ddpf.flags & DDS_FOURCC)

8
DirectXTex/DDS.h
View File

@ -149,7 +149,7 @@ DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_A4L4 =
{ sizeof(DDS_PIXELFORMAT), DDS_LUMINANCEA, 0, 8, 0x0f, 0, 0, 0xf0 };
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_L8 =
{ sizeof(DDS_PIXELFORMAT), DDS_LUMINANCE, 0, 8, 0xff, 0, 0, 0 };
{ sizeof(DDS_PIXELFORMAT), DDS_LUMINANCE, 0, 8, 0xff, 0, 0, 0 };
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_L16 =
{ sizeof(DDS_PIXELFORMAT), DDS_LUMINANCE, 0, 16, 0xffff, 0, 0, 0 };
@ -160,6 +160,12 @@ DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_A8L8 =
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_A8L8_ALT =
{ sizeof(DDS_PIXELFORMAT), DDS_LUMINANCEA, 0, 8, 0x00ff, 0, 0, 0xff00 };
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_L8_NVTT1 =
{ sizeof(DDS_PIXELFORMAT), DDS_RGB, 0, 8, 0xff, 0, 0, 0 };
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_L16_NVTT1 =
{ sizeof(DDS_PIXELFORMAT), DDS_RGB, 0, 16, 0xffff, 0, 0, 0 };
DDSGLOBALCONST DDS_PIXELFORMAT DDSPF_A8L8_NVTT1 =
{ sizeof(DDS_PIXELFORMAT), DDS_RGBA, 0, 16, 0x00ff, 0, 0, 0xff00 };

10
DirectXTex/DirectXTexDDS.cpp
View File

@ -100,11 +100,15 @@ namespace
{ DXGI_FORMAT_B5G6R5_UNORM, CONV_FLAGS_EXPAND
| CONV_FLAGS_332, DDSPF_R3G3B2 }, // D3DFMT_R3G3B2
{ DXGI_FORMAT_R8_UNORM, CONV_FLAGS_NONE, DDSPF_L8 }, // D3DFMT_L8
{ DXGI_FORMAT_R16_UNORM, CONV_FLAGS_NONE, DDSPF_L16 }, // D3DFMT_L16
{ DXGI_FORMAT_R8_UNORM, CONV_FLAGS_NONE, DDSPF_L8 }, // D3DFMT_L8
{ DXGI_FORMAT_R16_UNORM, CONV_FLAGS_NONE, DDSPF_L16 }, // D3DFMT_L16
{ DXGI_FORMAT_R8G8_UNORM, CONV_FLAGS_NONE, DDSPF_A8L8 }, // D3DFMT_A8L8
{ DXGI_FORMAT_R8G8_UNORM, CONV_FLAGS_NONE, DDSPF_A8L8_ALT }, // D3DFMT_A8L8 (alternative bitcount)
{ DXGI_FORMAT_R8G8_UNORM, CONV_FLAGS_NONE, DDSPF_A8L8_NVTT1 }, // D3DFMT_A8L8 (NVTT v1 wrote it with RGB instead of LUMINANCE)
// NVTT v1 wrote these with RGB instead of LUMINANCE
{ DXGI_FORMAT_R8_UNORM, CONV_FLAGS_NONE, DDSPF_L8_NVTT1 }, // D3DFMT_L8
{ DXGI_FORMAT_R16_UNORM, CONV_FLAGS_NONE, DDSPF_L16_NVTT1 }, // D3DFMT_L16
{ DXGI_FORMAT_R8G8_UNORM, CONV_FLAGS_NONE, DDSPF_A8L8_NVTT1 }, // D3DFMT_A8L8
{ DXGI_FORMAT_A8_UNORM, CONV_FLAGS_NONE, DDSPF_A8 }, // D3DFMT_A8