[gameprogrammer] GL

Hey guys,

Does anyone know if theres a way to take part of the screen and make a
gl texture out of that?

Basically what i'm trying to do is a post processing effect where i
take whats on the screen and manipulate it.  glreadpixels is going way
slow and i was thinking i only need to take an image from the screen
(video memory) and make a texture with it (more video memory) so is
there a way to do it without having to pull the pixel data into system
memory?

Thanks!!
Alan

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