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Help With Blitting

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Does anybody know a FAST way of blitting a bitmap to the screen. I currently have a program which draws a world in 3D. I then blit a 2D bitmap to the screen as a HUD. Currently I am using the "glDrawPixels()" Function (I think thats what its called, i''m doing it from memory), but when I implement the function the framerate halves from 90 FPS to 45 FPS. Does anyone know a better faster way of blitting? Thanks in advance for any help - Weasalmongler

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