D3D12_PACKED_MIP_INFO structure (d3d12.h)
Describes the tile structure of a tiled resource with mipmaps.
Syntax
typedef struct D3D12_PACKED_MIP_INFO {
UINT8 NumStandardMips;
UINT8 NumPackedMips;
UINT NumTilesForPackedMips;
UINT StartTileIndexInOverallResource;
} D3D12_PACKED_MIP_INFO;
Members
NumStandardMips
The number of standard mipmaps in the tiled resource.
NumPackedMips
The number of packed mipmaps in the tiled resource.
This number starts from the least detailed mipmap (either sharing tiles or using non standard tile layout). This number is 0 if no such packing is in the resource. For array surfaces, this value is the number of mipmaps that are packed for a given array slice where each array slice repeats the same packing.
On Tier_2 tiled resources hardware, mipmaps that fill at least one standard shaped tile in all dimensions are not allowed to be included in the set of packed mipmaps. On Tier_1 hardware, mipmaps that are an integer multiple of one standard shaped tile in all dimensions are not allowed to be included in the set of packed mipmaps. Mipmaps with at least one dimension less than the standard tile shape may or may not be packed. When a given mipmap needs to be packed, all coarser mipmaps for a given array slice are considered packed as well.
NumTilesForPackedMips
The number of tiles for the packed mipmaps in the tiled resource.
If there is no packing, this value is meaningless and is set to 0. Otherwise, it is set to the number of tiles that are needed to represent the set of packed mipmaps. The pixel layout within the packed mipmaps is hardware specific. If apps define only partial mappings for the set of tiles in packed mipmaps, read and write behavior is vendor specific and undefined. For arrays, this value is only the count of packed mipmaps within the subresources for each array slice.
StartTileIndexInOverallResource
The offset of the first packed tile for the resource in the overall range of tiles. If NumPackedMips is 0, this value is meaningless and is 0. Otherwise, it is the offset of the first packed tile for the resource in the overall range of tiles for the resource. A value of 0 for StartTileIndexInOverallResource means the entire resource is packed. For array surfaces, this is the offset for the tiles that contain the packed mipmaps for the first array slice. Packed mipmaps for each array slice in arrayed surfaces are at this offset past the beginning of the tiles for each array slice.
Remarks
This structure is used by the GetResourceTiling method.
Requirements
| Requirement | Value |
|---|---|
| Header | d3d12.h |