d3dxsprite.h

Direct8.1SDK 游戏编程必备SDK 8.1版适用范围广些

                         LPDIRECT3DDEVICE7     pd3dDevice, 
                         D3DXVECTOR3           *ppointDest, 
                         float                 alpha,
                         float                 scale,
                         float                 angleRad,
                         D3DXVECTOR2           *pOffset,
                         RECT                  *pSourceRect);
#endif

//-------------------------------------------------------------------------
// The D3DXDrawSprite() function transforms source images onto a 3D 
// rendering device. It takes a general 4x4 matrix which is use to transform
// the points of a default rect: (left=-.5, top=-.5, right=+.5, bottom=+.5).
// (This default rect was chosen so that it was centered around the origin
// to ease setting up rotations. And it was chosen to have a width/height of one
// to ease setting up scales.)
// 
// This function only calls SetTexture on the first 
// renderstage with the parameter (pd3dTexture) if that parameter is non-null. 
// This function assumes that D3DXPrepareDeviceForSprite has been called on 
// the device or that caller has in some other way correctly prepared the 
// renderstates.
//
// This function supports alpha-blending, and choosing 
// a source sub-rect. (A value of NULL for source sub-rect means the entire
// texture is used.)
//
// Note that if the transformed points have a value for w (the homogenous
// coordinate) that is not 1, then this function will invert it and pass
// that value to D3D as the rhw field of a TLVERTEX. If the value for w is
// zero, then it use 1 as the rhw.
//
// Parameters: 
//      pd3dTexture - a pointer to the surface containing the texture
//      pd3dDevice  - a pointer to the d3d device to render to. It is
//                    assumed that render states are set up. (See
//                    D3DXPrepareDeviceForSprite)
//      pMatrixTransform - 4x4 matrix that specifies the transformation
//                    that will be applied to the default -.5 to +.5 
//                    rectangle.
//      alpha       - alpha value to apply to sprite. 1.0 means totally
//                    opaque; and 0.0 means totally transparent. 
//                    WARNING: If you are using alpha, then you should render
//                    from back to front in order to avoid rendering
//                    artifacts.Furthermore, you should avoid scenarios where 
//                    semi-transparent objects intersect.
//      pSourceRect - a rect that indicates what portion of the source
//                    source texture to use. If NULL is passed, then the
//                    entire source is used. If the source texture was 
//                    created via D3DX, then the rect should be specified
//                    in the coordinates of the original image (so that you
//                    don't have to worry about stretching/scaling that D3DX
//                    may have done to make the image work with your current
//                    3D Device.) Note that mirroring may be simply accomplished
//                    by swapping the left/right or top/bottom fields of
//                    this RECT.
// 
//-------------------------------------------------------------------------

#ifdef __cplusplus
HRESULT WINAPI 
    D3DXDrawSpriteTransform(LPDIRECTDRAWSURFACE7  pd3dTexture, 
                            LPDIRECT3DDEVICE7     pd3dDevice, 
                            const D3DXMATRIX      *pMatrixTransform, 
                            float                 alpha         = 1.0f,
                            const RECT            *pSourceRect  = NULL);
#else
HRESULT WINAPI 
    D3DXDrawSpriteTransform(LPDIRECTDRAWSURFACE7  pd3dTexture, 
                            LPDIRECT3DDEVICE7     pd3dDevice, 
                            D3DXMATRIX            *pMatrixTransform, 
                            float                 alpha,
                            RECT                  *pSourceRect);
#endif

//-------------------------------------------------------------------------
// The D3DXBuildSpriteTransform() function is a helper provided which
// creates a matrix corresponding to simple properties. This matrix is
// set up to pass directly to D3DXTransformSprite.
//
// Parameters: 
//      pMatrix     - a pointer to the result matrix
//      prectDest   - a pointer to the target rectangle for the sprite
//      angleRad    - angle of rotation around the 'center' of the rect
//      pOffset     - offset from the center of the source rect to use as the 
//                    center of rotation
// 
//-------------------------------------------------------------------------

#ifdef __cplusplus
void WINAPI
    D3DXBuildSpriteTransform(D3DXMATRIX            *pMatrix,
                             const RECT            *prectDest,
                             float                 angleRad     = 0.0f,
                             const D3DXVECTOR2     *pOffset     = NULL);
#else
void WINAPI
    D3DXBuildSpriteTransform(D3DXMATRIX            *pMatrix,
                             RECT                  *prectDest,
                             float                 angleRad,
                             D3DXVECTOR2           *pOffset);
#endif


//-------------------------------------------------------------------------
// The D3DXDrawSprite3D() function renders a texture onto a 3D quad. The
// quad ABCD is broken into two triangles ABC and ACD which are rendered
// via DrawPrim.
//
// Parameters: 
//      pd3dTexture - a pointer to the surface containing the texture
//      pd3dDevice  - a pointer to the d3d device to render to. It is
//                    assumed that render states are set up. (See
//                    D3DXPrepareDeviceForSprite)
//      quad        - array of 4 points in the following order:
//                    upper-left, upper-right, lower-right, lower-left.
//                    If these vectors contain a W, then this function
//                    will take the reciprocal of that value to pass as
//                    as the rhw (i.e. reciprocal homogenous w).
//      alpha       - alpha value to apply to sprite. 1.0 means totally
//                    opaque; and 0.0 means totally transparent. 
//                    WARNING: If you are using alpha, then you should render
//                    from back to front in order to avoid rendering
//                    artifacts.Furthermore, you should avoid scenarios where 
//                    semi-transparent objects intersect.
//      pSourceRect - a rect that indicates what portion of the source
//                    source texture to use. If NULL is passed, then the
//                    entire source is used. If the source texture was 
//                    created via D3DX, then the rect should be specified
//                    in the coordinates of the original image (so that you
//                    don't have to worry about stretching/scaling that D3DX
//                    may have done to make the image work with your current
//                    3D Device.) Note that mirroring may be simply accomplished
//                    by swapping the left/right or top/bottom fields of
//                    this RECT.
//-------------------------------------------------------------------------

#ifdef __cplusplus
HRESULT WINAPI 
    D3DXDrawSprite3D(LPDIRECTDRAWSURFACE7  pd3dTexture, 
                     LPDIRECT3DDEVICE7     pd3dDevice, 
                     const D3DXVECTOR4     quad[4], 
                     float                 alpha         = 1.0f,
                     const RECT            *pSourceRect  = NULL);
#else
HRESULT WINAPI 
    D3DXDrawSprite3D(LPDIRECTDRAWSURFACE7  pd3dTexture, 
                     LPDIRECT3DDEVICE7     pd3dDevice, 
                     D3DXVECTOR4           quad[4], 
                     float                 alpha,
                     RECT                  *pSourceRect);
#endif



#ifdef __cplusplus
} // extern "C"
#endif

#endif // __D3DXSPRITE_H__