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This table maps members of a D3DVERTEXELEMENT9 declaration to a Direct3D 8 declaration.
| Direct3D 9 Usage | Direct3D 9 Usage index | Direct3D 8 |
|---|---|---|
| D3DDECLUSAGE_POSITION | 0 | D3DVSDE_POSITION |
| D3DDECLUSAGE_POSITION | 1 | D3DVSDE_POSITION2 |
| D3DDECLUSAGE_NORMAL | 0 | D3DVSDE_NORMAL |
| D3DDECLUSAGE_NORMAL | 1 | D3DVSDE_NORMAL2 |
| D3DDECLUSAGE_BLENDWEIGHT | 0 | D3DVSDE_BLENDWEIGHT |
| D3DDECLUSAGE_BLENDINDICES | 0 | D3DVSDE_BLENDINDICES |
| D3DDECLUSAGE_PSIZE | 0 | D3DVSDE_PSIZE |
| D3DDECLUSAGE_COLOR | 0 | D3DVSDE_DIFFUSE |
| D3DDECLUSAGE_COLOR | 1 | D3DVSDE_SPECULAR |
| D3DDECLUSAGE_TEXCOORD | n | D3DVSDE_TEXCOORDn |
When a declaration is used with hardware vertex processing on a Direct3D 7 driver, the Direct3D runtime converts it to a FVF with the following rules:
- Only stream 0 should be used (evident from the MaxStreams cap).
- The order of vertex elements should be the same as order of FVF bits.
- Gaps in texture coordinates are not allowed.
- Any vertex element not described the table cannot be converted into a valid FVF for all pre-DirectX 8 drivers and, hence, cannot be used on those drivers.
- Only D3DDECLTYPE_FLOAT2 is allowed for vertex elements with D3DDECLUSAGE_TEXCOORD if device does not set either of the D3DPTEXTURECAPS_PROJECTED or D3DPTEXTURECAPS_CUBEMAP caps.
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