TexMetadata

The TexMetadata structure describes a (potentially complex) image surface.

struct TexMetadata
{
    size_t          width;
    size_t          height;
    size_t          depth;
    size_t          arraySize;
    size_t          mipLevels;
    uint32_t        miscFlags;
    uint32_t        miscFlags2;
    DXGI_FORMAT     format;
    TEX_DIMENSION   dimension;
}

Fields

• height should be 1 for 1D textures.

• depth should be 1 for 1D and 2D textures.

• arraySize should be 1 for non-array resources. For cubemaps it should be 6. For cubemap arrays it should be a multiple of 6 (i.e. numCubes = arraySize / 6).

• mipLevels should be 1 for non-mipmapped images.

Methods

• ComputeIndex: Returns the image index given the parameters for miplevel (0-based), array item (0-based), and volume slice (0-based). Returns size_t(-1) to indicate an out-of-range error.

• IsCubemap: Returns true if the image is defined as cubemap or cubemap array as indicated by miscFlags.

• IsPMAlpha: Returns true if the image data is premultipled alpha content (rather than straight alpha) as indicated by miscFlags2.

• SetAlphaMode: Encodes the alpha mode into the miscFlags2 field.

• GetAlphaMode: Returns the alpha mode encoded into the miscFlags2 field.

• IsVolumemap: Returns true if the image data is a volume map (i.e. 3D texture) as indicated by dimension.

Remarks

The alpha modes are TEX_ALPHA_MODE_UNKNOWN, TEX_ALPHA_MODE_STRAIGHT, TEX_ALPHA_MODE_PREMULTIPLIED, TEX_ALPHA_MODE_OPAQUE, and TEX_ALPHA_MODE_CUSTOM. They match DDS_ALPHA_MODE.

Remarks

• TEX_DIMENSION_TEXTURE1D, TEX_DIMENSION_TEXTURE2D, and TEX_DIMENSION_TEXTURE3D are aliases for D3D10_RESOURCE_DIMEMSION and D3D11_RESOURCE_DIMENSION.

• TEX_MISC_TEXTURECUBE is an alias for the same D3D10_RESOURCE_MISC_FLAG and D3D11_RESOURCE_MISC_FLAG.

• TEX_MISC2_ALPHA_MODE_MASK is a mask for miscFlags2 to obtain the TEX_ALPHA_MODE.