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DDSTextureLoader12.cpp
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DDSTextureLoader12.cpp
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//--------------------------------------------------------------------------------------
// File: DDSTextureLoader12.cpp
//
// Functions for loading a DDS texture and creating a Direct3D runtime resource for it
//
// Note these functions are useful as a light-weight runtime loader for DDS files. For
// a full-featured DDS file reader, writer, and texture processing pipeline see
// the 'Texconv' sample and the 'DirectXTex' library.
//
// Copyright (c) Microsoft Corporation.
// Licensed under the MIT License.
//
// http://go.microsoft.com/fwlink/?LinkId=248926
// http://go.microsoft.com/fwlink/?LinkID=615561
//--------------------------------------------------------------------------------------
#include "DDSTextureLoader12.h"
#include <algorithm>
#include <cassert>
#include <memory>
#include <new>
#ifndef _WIN32
#include <fstream>
#include <filesystem>
#endif
#ifdef _MSC_VER
// Off by default warnings
#pragma warning(disable : 4619 4616 4061 4062 4623 4626 5027)
// C4619/4616 #pragma warning warnings
// C4061 enumerator 'x' in switch of enum 'y' is not explicitly handled by a case label
// C4062 enumerator 'x' in switch of enum 'y' is not handled
// C4623 default constructor was implicitly defined as deleted
// C4626 assignment operator was implicitly defined as deleted
// C5027 move assignment operator was implicitly defined as deleted
#endif
#ifdef __clang__
#pragma clang diagnostic ignored "-Wtautological-type-limit-compare"
#pragma clang diagnostic ignored "-Wcovered-switch-default"
#pragma clang diagnostic ignored "-Wswitch"
#pragma clang diagnostic ignored "-Wswitch-enum"
#pragma clang diagnostic ignored "-Wunused-macros"
#endif
#define D3DX12_NO_STATE_OBJECT_HELPERS
#define D3DX12_NO_CHECK_FEATURE_SUPPORT_CLASS
#if !defined(_WIN32) || defined(USING_DIRECTX_HEADERS)
#include "directx/d3dx12.h"
#else
#include "d3dx12.h"
#endif
using namespace DirectX;
//--------------------------------------------------------------------------------------
// Macros
//--------------------------------------------------------------------------------------
#ifndef MAKEFOURCC
#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) */
// HRESULT_FROM_WIN32(ERROR_ARITHMETIC_OVERFLOW)
#define HRESULT_E_ARITHMETIC_OVERFLOW static_cast<HRESULT>(0x80070216L)
// HRESULT_FROM_WIN32(ERROR_NOT_SUPPORTED)
#define HRESULT_E_NOT_SUPPORTED static_cast<HRESULT>(0x80070032L)
// HRESULT_FROM_WIN32(ERROR_HANDLE_EOF)
#define HRESULT_E_HANDLE_EOF static_cast<HRESULT>(0x80070026L)
// HRESULT_FROM_WIN32(ERROR_INVALID_DATA)
#define HRESULT_E_INVALID_DATA static_cast<HRESULT>(0x8007000DL)
//--------------------------------------------------------------------------------------
// DDS file structure definitions
//
// See DDS.h in the 'Texconv' sample and the 'DirectXTex' library
//--------------------------------------------------------------------------------------
#pragma pack(push,1)
constexpr uint32_t DDS_MAGIC = 0x20534444; // "DDS "
struct DDS_PIXELFORMAT
{
uint32_t size;
uint32_t flags;
uint32_t fourCC;
uint32_t RGBBitCount;
uint32_t RBitMask;
uint32_t GBitMask;
uint32_t BBitMask;
uint32_t ABitMask;
};
#define DDS_FOURCC 0x00000004 // DDPF_FOURCC
#define DDS_RGB 0x00000040 // DDPF_RGB
#define DDS_LUMINANCE 0x00020000 // DDPF_LUMINANCE
#define DDS_ALPHA 0x00000002 // DDPF_ALPHA
#define DDS_BUMPDUDV 0x00080000 // DDPF_BUMPDUDV
#define DDS_HEADER_FLAGS_VOLUME 0x00800000 // DDSD_DEPTH
#define DDS_HEIGHT 0x00000002 // DDSD_HEIGHT
#define DDS_CUBEMAP_POSITIVEX 0x00000600 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEX
#define DDS_CUBEMAP_NEGATIVEX 0x00000a00 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEX
#define DDS_CUBEMAP_POSITIVEY 0x00001200 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEY
#define DDS_CUBEMAP_NEGATIVEY 0x00002200 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEY
#define DDS_CUBEMAP_POSITIVEZ 0x00004200 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_POSITIVEZ
#define DDS_CUBEMAP_NEGATIVEZ 0x00008200 // DDSCAPS2_CUBEMAP | DDSCAPS2_CUBEMAP_NEGATIVEZ
#define DDS_CUBEMAP_ALLFACES ( DDS_CUBEMAP_POSITIVEX | DDS_CUBEMAP_NEGATIVEX |\
DDS_CUBEMAP_POSITIVEY | DDS_CUBEMAP_NEGATIVEY |\
DDS_CUBEMAP_POSITIVEZ | DDS_CUBEMAP_NEGATIVEZ )
#define DDS_CUBEMAP 0x00000200 // DDSCAPS2_CUBEMAP
enum DDS_MISC_FLAGS2
{
DDS_MISC_FLAGS2_ALPHA_MODE_MASK = 0x7L,
};
struct DDS_HEADER
{
uint32_t size;
uint32_t flags;
uint32_t height;
uint32_t width;
uint32_t pitchOrLinearSize;
uint32_t depth; // only if DDS_HEADER_FLAGS_VOLUME is set in flags
uint32_t mipMapCount;
uint32_t reserved1[11];
DDS_PIXELFORMAT ddspf;
uint32_t caps;
uint32_t caps2;
uint32_t caps3;
uint32_t caps4;
uint32_t reserved2;
};
struct DDS_HEADER_DXT10
{
DXGI_FORMAT dxgiFormat;
uint32_t resourceDimension;
uint32_t miscFlag; // see D3D11_RESOURCE_MISC_FLAG
uint32_t arraySize;
uint32_t miscFlags2;
};
#pragma pack(pop)
//--------------------------------------------------------------------------------------
namespace
{
#ifdef _WIN32
struct handle_closer { void operator()(HANDLE h) noexcept { if (h) CloseHandle(h); } };
using ScopedHandle = std::unique_ptr<void, handle_closer>;
inline HANDLE safe_handle(HANDLE h) noexcept { return (h == INVALID_HANDLE_VALUE) ? nullptr : h; }
#endif
#if !defined(NO_D3D12_DEBUG_NAME) && ( defined(_DEBUG) || defined(PROFILE) )
template<UINT TNameLength>
inline void SetDebugObjectName(_In_ ID3D12DeviceChild* resource, _In_z_ const wchar_t(&name)[TNameLength]) noexcept
{
resource->SetName(name);
}
#else
template<UINT TNameLength>
inline void SetDebugObjectName(_In_ ID3D12DeviceChild*, _In_z_ const wchar_t(&)[TNameLength]) noexcept
{
}
#endif
inline uint32_t CountMips(uint32_t width, uint32_t height) noexcept
{
if (width == 0 || height == 0)
return 0;
uint32_t count = 1;
while (width > 1 || height > 1)
{
width >>= 1;
height >>= 1;
count++;
}
return count;
}
//--------------------------------------------------------------------------------------
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;
}
*bitSize = 0;
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 const 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(uint32_t) + sizeof(DDS_HEADER) + 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;
}
//--------------------------------------------------------------------------------------
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;
}
*bitSize = 0;
#ifdef _WIN32
// open the file
ScopedHandle hFile(safe_handle(CreateFile2(
fileName,
GENERIC_READ, FILE_SHARE_READ, OPEN_EXISTING,
nullptr)));
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
))
{
ddsData.reset();
return HRESULT_FROM_WIN32(GetLastError());
}
if (bytesRead < fileInfo.EndOfFile.LowPart)
{
ddsData.reset();
return E_FAIL;
}
size_t len = fileInfo.EndOfFile.LowPart;
#else // !WIN32
std::ifstream inFile(std::filesystem::path(fileName), std::ios::in | std::ios::binary | std::ios::ate);
if (!inFile)
return E_FAIL;
std::streampos fileLen = inFile.tellg();
if (!inFile)
return E_FAIL;
// Need at least enough data to fill the header and magic number to be a valid DDS
if (fileLen < (sizeof(uint32_t) + sizeof(DDS_HEADER)))
return E_FAIL;
ddsData.reset(new (std::nothrow) uint8_t[size_t(fileLen)]);
if (!ddsData)
return E_OUTOFMEMORY;
inFile.seekg(0, std::ios::beg);
if (!inFile)
{
ddsData.reset();
return E_FAIL;
}
inFile.read(reinterpret_cast<char*>(ddsData.get()), fileLen);
if (!inFile)
{
ddsData.reset();
return E_FAIL;
}
inFile.close();
size_t len = fileLen;
#endif
// DDS files always start with the same magic number ("DDS ")
auto const dwMagicNumber = *reinterpret_cast<const uint32_t*>(ddsData.get());
if (dwMagicNumber != DDS_MAGIC)
{
ddsData.reset();
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))
{
ddsData.reset();
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 (len < (sizeof(uint32_t) + sizeof(DDS_HEADER) + sizeof(DDS_HEADER_DXT10)))
{
ddsData.reset();
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 = len - offset;
return S_OK;
}
//--------------------------------------------------------------------------------------
// Return the BPP for a particular format
//--------------------------------------------------------------------------------------
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:
case DXGI_FORMAT_V408:
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:
case DXGI_FORMAT_P208:
case DXGI_FORMAT_V208:
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_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:
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;
default:
return 0;
}
}
//--------------------------------------------------------------------------------------
// Get surface information for a particular format
//--------------------------------------------------------------------------------------
HRESULT GetSurfaceInfo(
_In_ size_t width,
_In_ size_t height,
_In_ DXGI_FORMAT fmt,
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 ((height % 2) != 0)
{
// Requires a height alignment of 2.
return E_INVALIDARG;
}
planar = true;
bpe = 2;
break;
case DXGI_FORMAT_P208:
planar = true;
bpe = 2;
break;
case DXGI_FORMAT_P010:
case DXGI_FORMAT_P016:
if ((height % 2) != 0)
{
// Requires a height alignment of 2.
return E_INVALIDARG;
}
planar = true;
bpe = 4;
break;
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
{
const 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_E_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 )
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, 0))
{
return DXGI_FORMAT_B8G8R8X8_UNORM;
}
// No DXGI format maps to ISBITMASK(0x000000ff,0x0000ff00,0x00ff0000,0) 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, 0, 0))
{
return DXGI_FORMAT_R16G16_UNORM;
}
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
}
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, 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))
{
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;
}
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 3:3:2:8 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;
default:
return DXGI_FORMAT_UNKNOWN;
}
}
else if (ddpf.flags & DDS_LUMINANCE)
{
switch (ddpf.RGBBitCount)
{
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
}
// 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;
default:
return DXGI_FORMAT_UNKNOWN;
}
}
else if (ddpf.flags & DDS_ALPHA)
{
if (8 == ddpf.RGBBitCount)
{
return DXGI_FORMAT_A8_UNORM;
}
}
else if (ddpf.flags & DDS_BUMPDUDV)
{
switch (ddpf.RGBBitCount)
{
case 32:
if (ISBITMASK(0x000000ff, 0x0000ff00, 0x00ff0000, 0xff000000))
{
return DXGI_FORMAT_R8G8B8A8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
if (ISBITMASK(0x0000ffff, 0xffff0000, 0, 0))
{
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
break;
case 16:
if (ISBITMASK(0x00ff, 0xff00, 0, 0))
{
return DXGI_FORMAT_R8G8_SNORM; // D3DX10/11 writes this out as DX10 extension
}
break;
default:
return DXGI_FORMAT_UNKNOWN;
}
// 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)
{
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