如何实现屏幕镜像

hardy_game

是否先用glReadPixels ，再翻转 x=width-x; y=y; 再glDrawPixels ?

hardy_game

知道了，很简单。

        GLfloat mirrorMats[16]={
                -1,0,0,0,
                0,1,0,0,
                0,0,1,0,
                0,0,0,1,
       
        };

        glMultMatrixf(mirrorMats);

Devil

gluLookAt 最后三个参数整下啊.

千里马肝

D3DXMatrixReflect
Builds a matrix that reflects the coordinate system about a plane.

D3DXMATRIX * D3DXMatrixReflect(
  D3DXMATRIX * pOut,
  CONST D3DXPLANE * pPlane
);
Parameters
pOut
[in, out] Pointer to the D3DXMATRIX structure that is the result of the operation.
pPlane
[in] Pointer to the source D3DXPLANE structure.
Return Values
Pointer to a D3DXMATRIX structure that reflects the coordinate system about the source plane.

Remarks
This function normalizes the plane equation before it creates the reflected matrix.

The return value for this function is the same value returned in the pOut parameter. In this way, the D3DXMatrixReflect function can be used as a parameter for another function.

This function uses the following formula to compute the returned matrix.

P = normalize(Plane);
   
-2 * P.a * P.a + 1  -2 * P.b * P.a      -2 * P.c * P.a        0
-2 * P.a * P.b      -2 * P.b * P.b + 1  -2 * P.c * P.b        0
-2 * P.a * P.c      -2 * P.b * P.c      -2 * P.c * P.c + 1    0
-2 * P.a * P.d      -2 * P.b * P.d      -2 * P.c * P.d        l