Reporting Support of UBYTE4 Vertex Element
A DirectX 9.0 version driver must report support of the UBYTE4 vertex element type by setting the D3DDTCAPS_UBYTE4 bit in the DeclTypes member of the D3DCAPS9 structure. To indicate nonsupport of the UBYTE4 vertex element type, the driver does not set the D3DDTCAPS_UBYTE4 bit. In contrast, A DirectX 8.1 and earlier driver sets the D3DVTXPCAPS_NO_VSDT_UBYTE4 bit to indicate nonsupport of the UBYTE4 vertex element type.
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