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glConvolutionFilter2D()

 
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How exactly do you use a glConvolutionFilter2d() call? I know about convolution filters and kernels, but am not sure exactly how to implement them. Just a simple example with say... a gaussian blur, would be helpful.

 
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That link gives a good description of covolution in general, which I already know. I want to know how to use an opengl call to glConvolute2D to apply a convolution kernel to the window.

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