矩阵的点积

LPDIRECT3D9 g_pD3D = NULL; // Used to create the D3DDevice LPDIRECT3DDEVICE9 g_pd3dDevice = NULL; // Our rendering device LPD3DXSPRITE g_pSprite=NULL; LPDIRECT3DTEXTURE9 g_pTex=NULL; RECT texRC; D3DSURFACE_DESC desc; LPDIRECT3DTEXTURE9 g_pTex1=NULL; RECT texRC1; D3