Mapping between a Direct3D Declaration and FVF Codes (Direct3D 9)
This table maps members of a D3DVERTEXELEMENT9 declaration to a FVF code.
| Data type | Usage | Usage index | FVF |
|---|---|---|---|
| D3DDECLTYPE_FLOAT3 | D3DDECLUSAGE_POSITION | 0 | D3DFVF_XYZ |
| D3DDECLTYPE_FLOAT4 | D3DDECLUSAGE_POSITIONT | 0 | D3DFVF_XYZRHW |
| D3DDECLTYPE_FLOATn | D3DDECLUSAGE_BLENDWEIGHT | 0 | D3DFVF_XYZBn |
| D3DDECLTYPE_UBYTE4 | D3DDECLUSAGE_BLENDINDICES | 0 | D3DFVF_XYZB (nWeights+1) |
| D3DDECLTYPE_FLOAT3 | D3DDECLUSAGE_NORMAL | 0 | D3DFVF_NORMAL |
| D3DDECLTYPE_FLOAT1 | D3DDECLUSAGE_PSIZE | 0 | D3DFVF_PSIZE |
| D3DDECLTYPE_D3DCOLOR | D3DDECLUSAGE_COLOR | 0 | D3DFVF_DIFFUSE |
| D3DDECLTYPE_D3DCOLOR | D3DDECLUSAGE_COLOR | 1 | D3DFVF_SPECULAR |
| D3DDECLTYPE_FLOATm | D3DDECLUSAGE_TEXCOORD | n | D3DFVF_TEXCOORDSIZEm(n) |
| D3DDECLTYPE_FLOAT3 | D3DDECLUSAGE_POSITION | 1 | N/A |
| D3DDECLTYPE_FLOAT3 | D3DDECLUSAGE_NORMAL | 1 | N/A |
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