DX學習記錄-頂點結構

在DX例子中有這樣一個頂點結構

// 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)

開始我以爲自定義的頂點結構體裏成員的順序一定要和下面設置的宏的順序一樣，後面一想就發現SB了。因爲是按位或操作根本不存在先後順序嘛。

但是自定義的結構體結構肯定是有格式規定的，於是在SDK文檔裏找到了說明：

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！