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iTunes style vector-fire

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Is there a better way to do the iTunes / cthuga effect than 1. draw something 2. glReadPixels() into array 3. apply fade/vector displace / whatever to array 2. glDrawPixels() I've done this in VGA before, and it was easy cause of the direct memory access to video. But glReadPixels is really slow. thanks if you can help guys!

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