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Invert the y axis

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I created the Orthogonal Projection with this matrix:

2.0f/(right-left)             0                            0                -((right+left)/(right-left))
       0                2.0f/(top-bottom)                  0                -((top+bottom)/(top-bottom))
       0                      0                       -2.0f/(zf-zn)             -((zf+zn)/(zf-zn))
       0                      0                            0                             1

I call the function on this way:

OrthoProjection(&projection, 0, width, height, 0, -1.0f, 1.0f);

And I want to invert the y-axis.


I'm looking for another solution because I don't want to multiply the projection matrix by scale matrix (1.0f, -1.0f, 1.0f)


How can I do it???


Thanks advance.



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