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[OpenLayer] Dynamic lighting & shadows

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I was successful in creating a flashlight-like effect in Allegro using _getpixel(), but how could something like this be done using OpenLayer? I've created a cone-shaped Poly, but I can't use either GetPixel or GetMemoryBitmap because my FPS drops down to 0. Any ideas? My allegro version of the program (it's a test, and the code is butt ugly, or even worse, and there are memory leaks everywhere... but it's a test) is here:

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