Содержание

CreateDDSTextureFromMemory, CreateDDSTextureFromFile

Parameters
Remark
Example
DDS File Format

DirectXTK

This is a version of DDSTextureLoader for use by Xbox One XDK developers. This loads pre-tiled texture resources for use with the CreatePlacement APIs available to Xbox One exclusive app developers.

These pre-tiled resources are stored in a variant of the .DDS file format marked with the "XBOX" FourCC pixel format. To generate these .DDS files, see the xtexconv.

To load legacy DDPIXELFORMAT or FourCC "DX10" DXGI_FORMAT variant DDS files, use DDSTextureLoader

This function is only usable by Xbox registered developers via the Xbox One XDK.

Header

#include <XboxDDSTextureLoader.h>

Functions

These are in the Xbox namespace rather than DirectX

CreateDDSTextureFromMemory, CreateDDSTextureFromFile

These are equivalent to the same functions in DDSTextureLoader.

HRESULT CreateDDSTextureFromMemory( ID3D11DeviceX* d3dDevice,
    const uint8_t* ddsData, size_t ddsDataSize,
    ID3D11Resource** texture, ID3D11ShaderResourceView** textureView,
    void** grfxMemory, DDS_ALPHA_MODE* alphaMode = nullptr,
    bool forceSRGB = false );

HRESULT CreateDDSTextureFromFile( ID3D11DeviceX* d3dDevice,
    const wchar_t* szFileName,
    ID3D11Resource** texture, ID3D11ShaderResourceView** textureView,
    void** grfxMemory,
    DDS_ALPHA_MODE* alphaMode = nullptr,
    bool forceSRGB = false );

Parameters

Either texture or textureView can be nullptr, but not both.

The grfxMemory is returned as a pointer to the video memory which the caller is responsible for releasing with FreeDDSTextureMemory:

void FreeDDSTextureMemory( _In_opt_ void* grfxMemory );

There is also a forceSRGB option for working around gamma issues with content that is in the sRGB or similar color space but is not encoded explicitly as an SRGB format. This will force return format be one of the of DXGI_FORMAT_*_SRGB formats if it exist. Note that no pixel data conversion takes place.

Remark

Auto-gen mipmaps are not supported with these functions.

Example

using namespace Microsoft::WRL;

ComPtr<ID3D11ShaderResourceView> srv;

void *grfxMemory = nullptr;
HRESULT hr = Xbox::CreateDDSTextureFromFile( m_device.Get(),
    L"XboxTiledTexturedds", nullptr,
    srv.GetAddressOf(), &grfxMemory );
DX::ThrowIfFailed( hr );

DDS File Format

This function expects the DDS file to contain a pixel format with FourCC "XBOX" which signifies a specific variant of the file.

DWORD dwMagic
DDS_HEADER header
DDS_HEADER_XBOX
{
    DXGI_FORMAT dxgiFormat;
    uint32_t    resourceDimension;
    uint32_t    miscFlag; // see DDS_RESOURCE_MISC_FLAG
    uint32_t    arraySize;
    uint32_t    miscFlags2; // see DDS_MISC_FLAGS2
    uint32_t    tileMode; // see XG_TILE_MODE
    uint32_t    baseAlignment;
    uint32_t    dataSize;
    uint32_t    xdkVer; // matching _XDK_VER
} headerXbox
// Remainder of file is a tiled texture binary layout suitable
// for use with CreatePlacement APIs

Other DDS loaders and viewers will fail to recognize this pixel format, and other DDS creation tools do not support creating it. See the xtexconv sample for more information on creating this variant form of DDS files.

DDS on Microsoft Docs