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以前方泓写过一个 ，那个是用宏来实现，因为不符合C++ stand只能在特定编译器上用(用代码替换实现模板的，我试过vc6和gcc是可以的),vc7下编译不能通过。
最近研究c+模板,另外写了个可以在vc7上编译的。
这里还有个学WTL时写的fvf工具，用来自动生产struct和format的代码。可以用这个生成宏来做模板参数.
因为某些顶点格式本人并未用过，可能代码会有bug,如有问题请告知在下。
*-------------------------代码-----------------------------------*
//D3d9Fvf struct generate templates
//Author Kevinqing <qingzl@cdgwbn.com.cn>
//if you find any bugs,please let me know.
#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
*---------------------------------------------------------*
[em3] [em3] [em3] |
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发表于 2004-5-10 00:29:00
楼主