DX学习记录-顶点结构

在DX例子中有这样一个顶点结构

// A structure for our custom vertex type. We added a normal, and omitted the // color (which is provided by the material) struct CUSTOMVERTEX { D3DXVECTOR3 position; // The 3D position for the vertex D3DXVECTOR3 normal; // The surface normal for the vertex }; SetFVF(D3DFVF_XYZ|D3DFVF_NORMAL)

开始我以为自定义的顶点结构体里成员的顺序一定要和下面设置的宏的顺序一样，后面一想就发现SB了。因为是按位或操作根本不存在先后顺序嘛。

但是自定义的结构体结构肯定是有格式规定的，于是在SDK文档里找到了说明：

This table maps flexible vertex format (FVF) codes to a D3DVERTEXELEMENT9 structure.

FVF	Data type	Usage	Usage index
D3DFVF_XYZ	D3DDECLTYPE_FLOAT3	D3DDECLUSAGE_POSITION	0
D3DFVF_XYZRHW	D3DDECLTYPE_FLOAT4	D3DDECLUSAGE_POSITIONT	0
D3DFVF_XYZW	D3DDECLTYPE_FLOAT4	D3DDECLUSAGE_POSITION	0
D3DFVF_XYZB5 and D3DFVF_LASTBETA_UBYTE4	D3DVSDT_FLOAT3 D3DVSDT_FLOAT4 D3DVSDT_UBYTE4	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT D3DDECLUSAGE_BLENDINDICES	0
D3DFVF_XYZB5 and D3DFVF_LASTBETA_D3DCOLOR	D3DVSDT_FLOAT3 D3DVSDT_FLOAT4 D3DVSDT_D3DCOLOR	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT D3DDECLUSAGE_BLENDINDICES	0
D3DFVF_XYZB5	D3DDECLTYPE_FLOAT3 D3DDECLTYPE_FLOAT4 D3DDECLTYPE_FLOAT1	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT D3DDECLUSAGE_BLENDINDICES	0
D3DFVF_XYZBn (n=1..4)	D3DDECLTYPE_FLOAT3 D3DDECLTYPE_FLOATn	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT	0
D3DFVF_XYZBn (n=1..4) and D3DFVF_LASTBETA_UBYTE4	D3DDECLTYPE_FLOAT3 D3DDECLTYPE_FLOAT(n-1) D3DDECLTYPE_UBYTE4	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT D3DDECLUSAGE_BLENDINDICES	0
D3DFVF_XYZBn (n=1..4) and D3DFVF_LASTBETA_D3DCOLOR	D3DDECLTYPE_FLOAT3 D3DDECLTYPE_FLOAT(n-1) D3DDECLTYPE_D3DCOLOR	D3DDECLUSAGE_POSITION D3DDECLUSAGE_BLENDWEIGHT D3DDECLUSAGE_BLENDINDICES	0
D3DFVF_NORMAL	D3DDECLTYPE_FLOAT3	D3DDECLUSAGE_NORMAL	0
D3DFVF_PSIZE	D3DDECLTYPE_FLOAT1	D3DDECLUSAGE_PSIZE	0
D3DFVF_DIFFUSE	D3DDECLTYPE_D3DCOLOR	D3DDECLUSAGE_COLOR	0
D3DFVF_SPECULAR	D3DDECLTYPE_D3DCOLOR	D3DDECLUSAGE_COLOR	1
D3DFVF_TEXCOORDSIZEm(n)	D3DDECLTYPE_FLOATm	D3DDECLUSAGE_TEXCOORD	n

 

拜拜！