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LoaderHelpers.h
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//--------------------------------------------------------------------------------------
// File: LoaderHelpers.h
//
// Helper functions for texture loaders and screen grabber
//
// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkId=248929
// http://go.microsoft.com/fwlink/?LinkID=615561
//--------------------------------------------------------------------------------------
#pragma once
#include "DDS.h"
#include "DDSTextureLoader.h"
namespace DirectX
{
namespace LoaderHelpers
{
//--------------------------------------------------------------------------------------
// Return the BPP for a particular format
//--------------------------------------------------------------------------------------
inline size_t BitsPerPixel(_In_ DXGI_FORMAT fmt) noexcept
{
switch (fmt)
{
case DXGI_FORMAT_R32G32B32A32_TYPELESS:
case DXGI_FORMAT_R32G32B32A32_FLOAT:
case DXGI_FORMAT_R32G32B32A32_UINT:
case DXGI_FORMAT_R32G32B32A32_SINT:
return 128;
case DXGI_FORMAT_R32G32B32_TYPELESS:
case DXGI_FORMAT_R32G32B32_FLOAT:
case DXGI_FORMAT_R32G32B32_UINT:
case DXGI_FORMAT_R32G32B32_SINT:
return 96;
case DXGI_FORMAT_R16G16B16A16_TYPELESS:
case DXGI_FORMAT_R16G16B16A16_FLOAT:
case DXGI_FORMAT_R16G16B16A16_UNORM:
case DXGI_FORMAT_R16G16B16A16_UINT:
case DXGI_FORMAT_R16G16B16A16_SNORM:
case DXGI_FORMAT_R16G16B16A16_SINT:
case DXGI_FORMAT_R32G32_TYPELESS:
case DXGI_FORMAT_R32G32_FLOAT:
case DXGI_FORMAT_R32G32_UINT:
case DXGI_FORMAT_R32G32_SINT:
case DXGI_FORMAT_R32G8X24_TYPELESS:
case DXGI_FORMAT_D32_FLOAT_S8X24_UINT:
case DXGI_FORMAT_R32_FLOAT_X8X24_TYPELESS:
case DXGI_FORMAT_X32_TYPELESS_G8X24_UINT:
case DXGI_FORMAT_Y416:
case DXGI_FORMAT_Y210:
case DXGI_FORMAT_Y216:
return 64;
case DXGI_FORMAT_R10G10B10A2_TYPELESS:
case DXGI_FORMAT_R10G10B10A2_UNORM:
case DXGI_FORMAT_R10G10B10A2_UINT:
case DXGI_FORMAT_R11G11B10_FLOAT:
case DXGI_FORMAT_R8G8B8A8_TYPELESS:
case DXGI_FORMAT_R8G8B8A8_UNORM:
case DXGI_FORMAT_R8G8B8A8_UNORM_SRGB:
case DXGI_FORMAT_R8G8B8A8_UINT:
case DXGI_FORMAT_R8G8B8A8_SNORM:
case DXGI_FORMAT_R8G8B8A8_SINT:
case DXGI_FORMAT_R16G16_TYPELESS:
case DXGI_FORMAT_R16G16_FLOAT:
case DXGI_FORMAT_R16G16_UNORM:
case DXGI_FORMAT_R16G16_UINT:
case DXGI_FORMAT_R16G16_SNORM:
case DXGI_FORMAT_R16G16_SINT:
case DXGI_FORMAT_R32_TYPELESS:
case DXGI_FORMAT_D32_FLOAT:
case DXGI_FORMAT_R32_FLOAT:
case DXGI_FORMAT_R32_UINT:
case DXGI_FORMAT_R32_SINT:
case DXGI_FORMAT_R24G8_TYPELESS:
case DXGI_FORMAT_D24_UNORM_S8_UINT:
case DXGI_FORMAT_R24_UNORM_X8_TYPELESS:
case DXGI_FORMAT_X24_TYPELESS_G8_UINT:
case DXGI_FORMAT_R9G9B9E5_SHAREDEXP:
case DXGI_FORMAT_R8G8_B8G8_UNORM:
case DXGI_FORMAT_G8R8_G8B8_UNORM:
case DXGI_FORMAT_B8G8R8A8_UNORM:
case DXGI_FORMAT_B8G8R8X8_UNORM:
case DXGI_FORMAT_R10G10B10_XR_BIAS_A2_UNORM:
case DXGI_FORMAT_B8G8R8A8_TYPELESS:
case DXGI_FORMAT_B8G8R8A8_UNORM_SRGB:
case DXGI_FORMAT_B8G8R8X8_TYPELESS:
case DXGI_FORMAT_B8G8R8X8_UNORM_SRGB:
case DXGI_FORMAT_AYUV:
case DXGI_FORMAT_Y410:
case DXGI_FORMAT_YUY2:
return 32;
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
return 24;
case DXGI_FORMAT_R8G8_TYPELESS:
case DXGI_FORMAT_R8G8_UNORM:
case DXGI_FORMAT_R8G8_UINT:
case DXGI_FORMAT_R8G8_SNORM:
case DXGI_FORMAT_R8G8_SINT:
case DXGI_FORMAT_R16_TYPELESS:
case DXGI_FORMAT_R16_FLOAT:
case DXGI_FORMAT_D16_UNORM:
case DXGI_FORMAT_R16_UNORM:
case DXGI_FORMAT_R16_UINT:
case DXGI_FORMAT_R16_SNORM:
case DXGI_FORMAT_R16_SINT:
case DXGI_FORMAT_B5G6R5_UNORM:
case DXGI_FORMAT_B5G5R5A1_UNORM:
case DXGI_FORMAT_A8P8:
case DXGI_FORMAT_B4G4R4A4_UNORM:
return 16;
case DXGI_FORMAT_NV12:
case DXGI_FORMAT_420_OPAQUE:
case DXGI_FORMAT_NV11:
return 12;
case DXGI_FORMAT_R8_TYPELESS:
case DXGI_FORMAT_R8_UNORM:
case DXGI_FORMAT_R8_UINT:
case DXGI_FORMAT_R8_SNORM:
case DXGI_FORMAT_R8_SINT:
case DXGI_FORMAT_A8_UNORM:
case DXGI_FORMAT_AI44:
case DXGI_FORMAT_IA44:
case DXGI_FORMAT_P8:
return 8;
case DXGI_FORMAT_R1_UNORM:
return 1;
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
return 4;
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return 8;
#if (_WIN32_WINNT >= _WIN32_WINNT_WIN10)
case DXGI_FORMAT_V408:
return 24;
case DXGI_FORMAT_P208:
case DXGI_FORMAT_V208:
return 16;
#endif // (_WIN32_WINNT >= _WIN32_WINNT_WIN10)
#if defined(_XBOX_ONE) && defined(_TITLE)
case DXGI_FORMAT_R10G10B10_7E3_A2_FLOAT:
case DXGI_FORMAT_R10G10B10_6E4_A2_FLOAT:
case DXGI_FORMAT_R10G10B10_SNORM_A2_UNORM:
return 32;
case DXGI_FORMAT_D16_UNORM_S8_UINT:
case DXGI_FORMAT_R16_UNORM_X8_TYPELESS:
case DXGI_FORMAT_X16_TYPELESS_G8_UINT:
return 24;
case DXGI_FORMAT_R4G4_UNORM:
return 8;
#endif // _XBOX_ONE && _TITLE
case DXGI_FORMAT_UNKNOWN:
case DXGI_FORMAT_FORCE_UINT:
default:
return 0;
}
}
//--------------------------------------------------------------------------------------
inline DXGI_FORMAT MakeSRGB(_In_ DXGI_FORMAT format) noexcept
{
switch (format)
{
case DXGI_FORMAT_R8G8B8A8_UNORM:
return DXGI_FORMAT_R8G8B8A8_UNORM_SRGB;
case DXGI_FORMAT_BC1_UNORM:
return DXGI_FORMAT_BC1_UNORM_SRGB;
case DXGI_FORMAT_BC2_UNORM:
return DXGI_FORMAT_BC2_UNORM_SRGB;
case DXGI_FORMAT_BC3_UNORM:
return DXGI_FORMAT_BC3_UNORM_SRGB;
case DXGI_FORMAT_B8G8R8A8_UNORM:
return DXGI_FORMAT_B8G8R8A8_UNORM_SRGB;
case DXGI_FORMAT_B8G8R8X8_UNORM:
return DXGI_FORMAT_B8G8R8X8_UNORM_SRGB;
case DXGI_FORMAT_BC7_UNORM:
return DXGI_FORMAT_BC7_UNORM_SRGB;
default:
return format;
}
}
//--------------------------------------------------------------------------------------
inline bool IsCompressed(_In_ DXGI_FORMAT fmt) noexcept
{
switch (fmt)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
return true;
default:
return false;
}
}
//--------------------------------------------------------------------------------------
inline DXGI_FORMAT EnsureNotTypeless(DXGI_FORMAT fmt) noexcept
{
// Assumes UNORM or FLOAT; doesn't use UINT or SINT
switch (fmt)
{
case DXGI_FORMAT_R32G32B32A32_TYPELESS: return DXGI_FORMAT_R32G32B32A32_FLOAT;
case DXGI_FORMAT_R32G32B32_TYPELESS: return DXGI_FORMAT_R32G32B32_FLOAT;
case DXGI_FORMAT_R16G16B16A16_TYPELESS: return DXGI_FORMAT_R16G16B16A16_UNORM;
case DXGI_FORMAT_R32G32_TYPELESS: return DXGI_FORMAT_R32G32_FLOAT;
case DXGI_FORMAT_R10G10B10A2_TYPELESS: return DXGI_FORMAT_R10G10B10A2_UNORM;
case DXGI_FORMAT_R8G8B8A8_TYPELESS: return DXGI_FORMAT_R8G8B8A8_UNORM;
case DXGI_FORMAT_R16G16_TYPELESS: return DXGI_FORMAT_R16G16_UNORM;
case DXGI_FORMAT_R32_TYPELESS: return DXGI_FORMAT_R32_FLOAT;
case DXGI_FORMAT_R8G8_TYPELESS: return DXGI_FORMAT_R8G8_UNORM;
case DXGI_FORMAT_R16_TYPELESS: return DXGI_FORMAT_R16_UNORM;
case DXGI_FORMAT_R8_TYPELESS: return DXGI_FORMAT_R8_UNORM;
case DXGI_FORMAT_BC1_TYPELESS: return DXGI_FORMAT_BC1_UNORM;
case DXGI_FORMAT_BC2_TYPELESS: return DXGI_FORMAT_BC2_UNORM;
case DXGI_FORMAT_BC3_TYPELESS: return DXGI_FORMAT_BC3_UNORM;
case DXGI_FORMAT_BC4_TYPELESS: return DXGI_FORMAT_BC4_UNORM;
case DXGI_FORMAT_BC5_TYPELESS: return DXGI_FORMAT_BC5_UNORM;
case DXGI_FORMAT_B8G8R8A8_TYPELESS: return DXGI_FORMAT_B8G8R8A8_UNORM;
case DXGI_FORMAT_B8G8R8X8_TYPELESS: return DXGI_FORMAT_B8G8R8X8_UNORM;
case DXGI_FORMAT_BC7_TYPELESS: return DXGI_FORMAT_BC7_UNORM;
default: return fmt;
}
}
//--------------------------------------------------------------------------------------
inline HRESULT LoadTextureDataFromMemory(
_In_reads_(ddsDataSize) const uint8_t* ddsData,
size_t ddsDataSize,
const DDS_HEADER** header,
const uint8_t** bitData,
size_t* bitSize) noexcept
{
if (!header || !bitData || !bitSize)
{
return E_POINTER;
}
if (ddsDataSize > UINT32_MAX)
{
return E_FAIL;
}
if (ddsDataSize < (sizeof(uint32_t) + sizeof(DDS_HEADER)))
{
return E_FAIL;
}
// DDS files always start with the same magic number ("DDS ")
auto dwMagicNumber = *reinterpret_cast<const uint32_t*>(ddsData);
if (dwMagicNumber != DDS_MAGIC)
{
return E_FAIL;
}
auto hdr = reinterpret_cast<const DDS_HEADER*>(ddsData + sizeof(uint32_t));
// Verify header to validate DDS file
if (hdr->size != sizeof(DDS_HEADER) ||
hdr->ddspf.size != sizeof(DDS_PIXELFORMAT))
{
return E_FAIL;
}
// Check for DX10 extension
bool bDXT10Header = false;
if ((hdr->ddspf.flags & DDS_FOURCC) &&
(MAKEFOURCC('D', 'X', '1', '0') == hdr->ddspf.fourCC))
{
// Must be long enough for both headers and magic value
if (ddsDataSize < (sizeof(DDS_HEADER) + sizeof(uint32_t) + sizeof(DDS_HEADER_DXT10)))
{
return E_FAIL;
}
bDXT10Header = true;
}
// setup the pointers in the process request
*header = hdr;
auto offset = sizeof(uint32_t)
+ sizeof(DDS_HEADER)
+ (bDXT10Header ? sizeof(DDS_HEADER_DXT10) : 0u);
*bitData = ddsData + offset;
*bitSize = ddsDataSize - offset;
return S_OK;
}
//--------------------------------------------------------------------------------------
inline HRESULT LoadTextureDataFromFile(
_In_z_ const wchar_t* fileName,
std::unique_ptr<uint8_t[]>& ddsData,
const DDS_HEADER** header,
const uint8_t** bitData,
size_t* bitSize) noexcept
{
if (!header || !bitData || !bitSize)
{
return E_POINTER;
}
// open the file
#if (_WIN32_WINNT >= _WIN32_WINNT_WIN8)
ScopedHandle hFile(safe_handle(CreateFile2(fileName,
GENERIC_READ,
FILE_SHARE_READ,
OPEN_EXISTING,
nullptr)));
#else
ScopedHandle hFile(safe_handle(CreateFileW(fileName,
GENERIC_READ,
FILE_SHARE_READ,
nullptr,
OPEN_EXISTING,
FILE_ATTRIBUTE_NORMAL,
nullptr)));
#endif
if (!hFile)
{
return HRESULT_FROM_WIN32(GetLastError());
}
// Get the file size
FILE_STANDARD_INFO fileInfo;
if (!GetFileInformationByHandleEx(hFile.get(), FileStandardInfo, &fileInfo, sizeof(fileInfo)))
{
return HRESULT_FROM_WIN32(GetLastError());
}
// File is too big for 32-bit allocation, so reject read
if (fileInfo.EndOfFile.HighPart > 0)
{
return E_FAIL;
}
// Need at least enough data to fill the header and magic number to be a valid DDS
if (fileInfo.EndOfFile.LowPart < (sizeof(uint32_t) + sizeof(DDS_HEADER)))
{
return E_FAIL;
}
// create enough space for the file data
ddsData.reset(new (std::nothrow) uint8_t[fileInfo.EndOfFile.LowPart]);
if (!ddsData)
{
return E_OUTOFMEMORY;
}
// read the data in
DWORD BytesRead = 0;
if (!ReadFile(hFile.get(),
ddsData.get(),
fileInfo.EndOfFile.LowPart,
&BytesRead,
nullptr
))
{
return HRESULT_FROM_WIN32(GetLastError());
}
if (BytesRead < fileInfo.EndOfFile.LowPart)
{
return E_FAIL;
}
// DDS files always start with the same magic number ("DDS ")
auto dwMagicNumber = *reinterpret_cast<const uint32_t*>(ddsData.get());
if (dwMagicNumber != DDS_MAGIC)
{
return E_FAIL;
}
auto hdr = reinterpret_cast<const DDS_HEADER*>(ddsData.get() + sizeof(uint32_t));
// Verify header to validate DDS file
if (hdr->size != sizeof(DDS_HEADER) ||
hdr->ddspf.size != sizeof(DDS_PIXELFORMAT))
{
return E_FAIL;
}
// Check for DX10 extension
bool bDXT10Header = false;
if ((hdr->ddspf.flags & DDS_FOURCC) &&
(MAKEFOURCC('D', 'X', '1', '0') == hdr->ddspf.fourCC))
{
// Must be long enough for both headers and magic value
if (fileInfo.EndOfFile.LowPart < (sizeof(DDS_HEADER) + sizeof(uint32_t) + sizeof(DDS_HEADER_DXT10)))
{
return E_FAIL;
}
bDXT10Header = true;
}
// setup the pointers in the process request
*header = hdr;
auto offset = sizeof(uint32_t) + sizeof(DDS_HEADER)
+ (bDXT10Header ? sizeof(DDS_HEADER_DXT10) : 0u);
*bitData = ddsData.get() + offset;
*bitSize = fileInfo.EndOfFile.LowPart - offset;
return S_OK;
}
//--------------------------------------------------------------------------------------
// Get surface information for a particular format
//--------------------------------------------------------------------------------------
inline HRESULT GetSurfaceInfo(
_In_ size_t width,
_In_ size_t height,
_In_ DXGI_FORMAT fmt,
_Out_opt_ size_t* outNumBytes,
_Out_opt_ size_t* outRowBytes,
_Out_opt_ size_t* outNumRows) noexcept
{
uint64_t numBytes = 0;
uint64_t rowBytes = 0;
uint64_t numRows = 0;
bool bc = false;
bool packed = false;
bool planar = false;
size_t bpe = 0;
switch (fmt)
{
case DXGI_FORMAT_BC1_TYPELESS:
case DXGI_FORMAT_BC1_UNORM:
case DXGI_FORMAT_BC1_UNORM_SRGB:
case DXGI_FORMAT_BC4_TYPELESS:
case DXGI_FORMAT_BC4_UNORM:
case DXGI_FORMAT_BC4_SNORM:
bc = true;
bpe = 8;
break;
case DXGI_FORMAT_BC2_TYPELESS:
case DXGI_FORMAT_BC2_UNORM:
case DXGI_FORMAT_BC2_UNORM_SRGB:
case DXGI_FORMAT_BC3_TYPELESS:
case DXGI_FORMAT_BC3_UNORM:
case DXGI_FORMAT_BC3_UNORM_SRGB:
case DXGI_FORMAT_BC5_TYPELESS:
case DXGI_FORMAT_BC5_UNORM:
case DXGI_FORMAT_BC5_SNORM:
case DXGI_FORMAT_BC6H_TYPELESS:
case DXGI_FORMAT_BC6H_UF16:
case DXGI_FORMAT_BC6H_SF16:
case DXGI_FORMAT_BC7_TYPELESS:
case DXGI_FORMAT_BC7_UNORM:
case DXGI_FORMAT_BC7_UNORM_SRGB:
bc = true;
bpe = 16;
break;
case DXGI_FORMAT_R8G8_B8G8_UNORM:
case DXGI_FORMAT_G8R8_G8B8_UNORM:
case DXGI_FORMAT_YUY2:
packed = true;
bpe = 4;
break;
case DXGI_FORMAT_Y210:
case DXGI_FORMAT_Y216:
packed = true;
bpe = 8;
break;
case DXGI_FORMAT_NV12:
case DXGI_FORMAT_420_OPAQUE:
#if (_WIN32_WINNT >= _WIN32_WINNT_WIN10)
case DXGI_FORMAT_P208:
#endif
planar = true;
bpe = 2;
break;
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
planar = true;
bpe = 4;
break;
#if defined(_XBOX_ONE) && defined(_TITLE)
case DXGI_FORMAT_D16_UNORM_S8_UINT:
case DXGI_FORMAT_R16_UNORM_X8_TYPELESS:
case DXGI_FORMAT_X16_TYPELESS_G8_UINT:
planar = true;
bpe = 4;
break;
#endif
default:
break;
}
if (bc)
{
uint64_t numBlocksWide = 0;
if (width > 0)
{
numBlocksWide = std::max<uint64_t>(1u, (uint64_t(width) + 3u) / 4u);
}
uint64_t numBlocksHigh = 0;
if (height > 0)
{
numBlocksHigh = std::max<uint64_t>(1u, (uint64_t(height) + 3u) / 4u);
}
rowBytes = numBlocksWide * bpe;
numRows = numBlocksHigh;
numBytes = rowBytes * numBlocksHigh;
}
else if (packed)
{
rowBytes = ((uint64_t(width) + 1u) >> 1) * bpe;
numRows = uint64_t(height);
numBytes = rowBytes * height;
}
else if (fmt == DXGI_FORMAT_NV11)
{
rowBytes = ((uint64_t(width) + 3u) >> 2) * 4u;
numRows = uint64_t(height) * 2u; // Direct3D makes this simplifying assumption, although it is larger than the 4:1:1 data
numBytes = rowBytes * numRows;
}
else if (planar)
{
rowBytes = ((uint64_t(width) + 1u) >> 1) * bpe;
numBytes = (rowBytes * uint64_t(height)) + ((rowBytes * uint64_t(height) + 1u) >> 1);
numRows = height + ((uint64_t(height) + 1u) >> 1);
}
else
{
size_t bpp = BitsPerPixel(fmt);
if (!bpp)
return E_INVALIDARG;
rowBytes = (uint64_t(width) * bpp + 7u) / 8u; // round up to nearest byte
numRows = uint64_t(height);
numBytes = rowBytes * height;
}
#if defined(_M_IX86) || defined(_M_ARM) || defined(_M_HYBRID_X86_ARM64)
static_assert(sizeof(size_t) == 4, "Not a 32-bit platform!");
if (numBytes > UINT32_MAX || rowBytes > UINT32_MAX || numRows > UINT32_MAX)
return HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW);
#else
static_assert(sizeof(size_t) == 8, "Not a 64-bit platform!");
#endif
if (outNumBytes)
{
*outNumBytes = static_cast<size_t>(numBytes);
}
if (outRowBytes)
{
*outRowBytes = static_cast<size_t>(rowBytes);
}
if (outNumRows)
{
*outNumRows = static_cast<size_t>(numRows);
}
return S_OK;
}
//--------------------------------------------------------------------------------------
#define ISBITMASK( r,g,b,a ) ( ddpf.RBitMask == r && ddpf.GBitMask == g && ddpf.BBitMask == b && ddpf.ABitMask == a )
inline DXGI_FORMAT GetDXGIFormat(const DDS_PIXELFORMAT& ddpf) noexcept
{
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 assume
// 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 (ISBITMASK(0x000000ff, 0x00000000, 0x00000000, 0x0000ff00))
{
return DXGI_FORMAT_R8G8_UNORM; // Some DDS writers assume the bitcount should be 8 instead of 16
}
}
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_BUMPDUDV)
{
if (16 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x00ff, 0xff00, 0x0000, 0x0000))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
}
if (32 == ddpf.RGBBitCount)
{
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
if (ISBITMASK(0x0000ffff, 0xffff0000, 0x00000000, 0x00000000))
{
return DXGI_FORMAT_R16G16_SNORM; // D3DX10/11 writes this out as DX10 extension
}
// No DXGI format maps to ISBITMASK(0x3ff00000, 0x000ffc00, 0x000003ff, 0xc0000000) aka D3DFMT_A2W10V10U10
}
}
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-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)
{
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;
}
#undef ISBITMASK
//--------------------------------------------------------------------------------------
inline DirectX::DDS_ALPHA_MODE GetAlphaMode(_In_ const DDS_HEADER* header) noexcept
{
if (header->ddspf.flags & DDS_FOURCC)
{
if (MAKEFOURCC('D', 'X', '1', '0') == header->ddspf.fourCC)
{
auto d3d10ext = reinterpret_cast<const DDS_HEADER_DXT10*>(reinterpret_cast<const uint8_t*>(header) + sizeof(DDS_HEADER));
auto mode = static_cast<DDS_ALPHA_MODE>(d3d10ext->miscFlags2 & DDS_MISC_FLAGS2_ALPHA_MODE_MASK);
switch (mode)
{
case DDS_ALPHA_MODE_STRAIGHT:
case DDS_ALPHA_MODE_PREMULTIPLIED:
case DDS_ALPHA_MODE_OPAQUE:
case DDS_ALPHA_MODE_CUSTOM:
return mode;
case DDS_ALPHA_MODE_UNKNOWN:
default:
break;
}
}
else if ((MAKEFOURCC('D', 'X', 'T', '2') == header->ddspf.fourCC)
|| (MAKEFOURCC('D', 'X', 'T', '4') == header->ddspf.fourCC))
{
return DDS_ALPHA_MODE_PREMULTIPLIED;
}
}
return DDS_ALPHA_MODE_UNKNOWN;
}
//--------------------------------------------------------------------------------------
class auto_delete_file
{
public:
auto_delete_file(HANDLE hFile) noexcept : m_handle(hFile) {}
auto_delete_file(const auto_delete_file&) = delete;
auto_delete_file& operator=(const auto_delete_file&) = delete;
~auto_delete_file()
{
if (m_handle)
{
FILE_DISPOSITION_INFO info = {};
info.DeleteFile = TRUE;
(void)SetFileInformationByHandle(m_handle, FileDispositionInfo, &info, sizeof(info));
}
}
void clear() noexcept { m_handle = nullptr; }
private:
HANDLE m_handle;
};
class auto_delete_file_wic
{
public:
auto_delete_file_wic(Microsoft::WRL::ComPtr<IWICStream>& hFile, LPCWSTR szFile) noexcept : m_filename(szFile), m_handle(hFile) {}
auto_delete_file_wic(const auto_delete_file_wic&) = delete;
auto_delete_file_wic& operator=(const auto_delete_file_wic&) = delete;
~auto_delete_file_wic()
{
if (m_filename)
{
m_handle.Reset();
DeleteFileW(m_filename);
}
}
void clear() noexcept { m_filename = nullptr; }
private:
LPCWSTR m_filename;
Microsoft::WRL::ComPtr<IWICStream>& m_handle;
};
}
}