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These options identify query resource types.
| #define | Description |
|---|---|
| D3DUSAGE_QUERY_FILTER | Query the resource format to see if it supports texture filter types other than D3DTEXF_POINT (which is always supported). |
| D3DUSAGE_QUERY_LEGACYBUMPMAP | Query the resource about a legacy bump map. |
| D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING | Query the resource to verify support for post pixel shader blending support. If CheckDeviceFormat fails with D3DUSAGE_QUERY_POSTPIXELSHADER_BLENDING, post pixel blending operations are not supported. These include alpha test, pixel fog, render-target blending, color write enable, and dithering. |
| D3DUSAGE_QUERY_SRGBREAD | Query the resource to verify if a texture supports gamma correction during a read operation. |
| D3DUSAGE_QUERY_SRGBWRITE | Query the resource to verify if a texture supports gamma correction during a write operation. |
| D3DUSAGE_QUERY_VERTEXTEXTURE | Query the resource to verify support for vertex shader texture sampling. |
| D3DUSAGE_QUERY_WRAPANDMIP | Query the resource to verify support for texture wrapping and mip-mapping. |
Use CheckDeviceFormat to query hardware support for these usages, and some other usages listed in D3DUSAGE.
Constant Information
| Requirement | Value |
|---|---|
| Header | d3d9types.h |
| Minimum operating system | Windows 98 |
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