D3dFvf顶点格式的C++描述(vc.net版)

王朝vc·作者佚名  2006-01-09
窄屏简体版  字體: |||超大  

以下代码在vc 7.1(vs.net2003)下编译通过。

使用模板偏特化实现

#ifndef _AI_D3DFVF_H_

#define _AI_D3DFVF_H_

//D3d9Fvf struct generate templates

//Author Kevinqing <qingzl@cdgwbn.com.cn>

//

#include <d3d9.h>

//-----------posoition-------------

namespace _D3DFvf{

template <bool b>struct pos_t;

template <> struct pos_t<true>{

union {

D3DVECTOR v;

struct{

float x,y,z;

};

};

};

//-----------RHW-------------------

template <bool b>struct rhw_t;

template <> struct rhw_t<false>{};

template <> struct rhw_t<true>{

float rhw;

};

//-----------W---------------------

template <bool b>struct w_t;

template <> struct w_t<false>{};

template <> struct w_t<true>{

DWORD w;

};

//-----------normal----------------

template <bool b>struct n_t;

template <> struct n_t<false>{};

template <> struct n_t<true>{

D3DVECTOR n;

};

//-----------psize-----------------

template <bool b>struct psize_t;

template <> struct psize_t<false>{};

template <> struct psize_t<true>{

float psize;

};

//-----------diff-------------------

template <bool b>struct diff_t;

template <> struct diff_t<false>{};

template <> struct diff_t<true>{

D3DCOLOR diff;

};

//-----------spec-------------------

template <bool b>struct spec_t;

template <> struct spec_t<false>{};

template <> struct spec_t<true>{

D3DCOLOR spec;

};

#define TestFlag(a,b,m) (bool((a&m)==b))

#define tp(a,b) TestFlag(a,b,D3DFVF_POSITION_MASK)

#define TestMask(a,b) (bool((a&b)!=0))

//----------b/i----------------------

#define IsXYZBn(a) (tp(a,D3DFVF_XYZB1)||tp(a,D3DFVF_XYZB2)||tp(a,D3DFVF_XYZB3)||tp(a,D3DFVF_XYZB4)||tp(a,D3DFVF_XYZB5))

#define XYZBn(a) (tp(a,D3DFVF_XYZB1)? 1:(tp(a,D3DFVF_XYZB2)? 2:(tp(a,D3DFVF_XYZB3)? 3:(tp(a,D3DFVF_XYZB4)? 4:(tp(a,D3DFVF_XYZB5)? 5:0)))))

template <bool b,int i>struct b_t;

template <int i>struct b_t<false,i>{};

template <>struct b_t<true,1>{

union{

float b;

DWORD i;

};

};

template <>struct b_t<true,2>{

union{

float b[2];

DWORD i[2];

};

};

template <>struct b_t<true,3>{

union{

float b[3];

DWORD i[3];

};

};

template <>struct b_t<true,4>{

union{

float b[4];

DWORD i[4];

};

};

template <>struct b_t<true,5>{

union{

float b[5];

DWORD i[5];

};

};

//--------------TEX-----------

#define TEXn(a) ((a&D3DFVF_TEXCOUNT_MASK)>>D3DFVF_TEXCOUNT_SHIFT)

#define _D3DFVF_TEXFMT(a,l) ((a>>(l*2+16))&3)

#define TEX_CORDn(a,l) ((_D3DFVF_TEXFMT(a,l)==D3DFVF_TEXTUREFORMAT1) ?1:((_D3DFVF_TEXFMT(a,l)==D3DFVF_TEXTUREFORMAT2) ?2:((_D3DFVF_TEXFMT(a,l)==D3DFVF_TEXTUREFORMAT3) ?3:4)))

#define DECL_TEXCORD_T(N) template <bool b,int n>struct texcord ## N ##_t;template <int n>struct texcord##N##_t<false,n>{};template <>struct texcord##N##_t<true,1>{float tu##N;};template <>struct texcord##N##_t<true,2>{float tu##N;float tv##N;};template <>struct texcord##N##_t<true,3>{float tu##N;float tv##N;float ta##N;};template <>struct texcord##N##_t<true,4>{float tu##N;float tv##N;float ta##N;float tb##N;};

DECL_TEXCORD_T(0)

DECL_TEXCORD_T(1)

DECL_TEXCORD_T(2)

DECL_TEXCORD_T(3)

DECL_TEXCORD_T(4)

DECL_TEXCORD_T(5)

DECL_TEXCORD_T(6)

DECL_TEXCORD_T(7)

template <const DWORD flag>

struct tex_t: public texcord0_t<(TEXn(flag)>0),TEX_CORDn(flag,0)>,

public texcord1_t<(TEXn(flag)>1),TEX_CORDn(flag,1)>,

public texcord2_t<(TEXn(flag)>2),TEX_CORDn(flag,2)>,

public texcord3_t<(TEXn(flag)>3),TEX_CORDn(flag,3)>,

public texcord4_t<(TEXn(flag)>4),TEX_CORDn(flag,4)>,

public texcord5_t<(TEXn(flag)>5),TEX_CORDn(flag,5)>,

public texcord6_t<(TEXn(flag)>6),TEX_CORDn(flag,6)>,

public texcord7_t<(TEXn(flag)>7),TEX_CORDn(flag,7)>

{

};

};//end of _D3DFvf

template <const DWORD Flags>

struct D3DFvf: public _D3DFvf::pos_t<TestMask(Flags,D3DFVF_POSITION_MASK)>,

public _D3DFvf::rhw_t<tp(Flags,D3DFVF_XYZRHW)>,

public _D3DFvf::w_t<tp(Flags,D3DFVF_XYZW)>,

public _D3DFvf::b_t<IsXYZBn(Flags),XYZBn(Flags)>,

public _D3DFvf::n_t<TestMask(Flags,D3DFVF_NORMAL)>,

public _D3DFvf::psize_t<TestMask(Flags,D3DFVF_PSIZE)>,

public _D3DFvf::diff_t<TestMask(Flags,D3DFVF_DIFFUSE)>,

public _D3DFvf::spec_t<TestMask(Flags,D3DFVF_SPECULAR)>,

public _D3DFvf::tex_t<Flags>

{

};

#undef TestFlag

#undef TestMask

#undef tp

#undef XYZBn

#undef IsXYZBn

#undef TEXn

#undef _D3DFVF_TEXFMT

#undef TEX_CORDn

#undef DECL_TEXCORD_T

#endif

 
 
 
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