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Syncing GLUT code to VSync

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So I'm writing an emulator, using GLUT/GL for windowing/input/graphics, and I want the game logic to be executed exactly once per re-draw and then free up the CPU for use by other programs. Unfortunately I can't find any functionality in GLUT to give me a callback once per frame, as would be optimal. Someone suggested to me that I use timer callbacks to get my code to run at roughly 60 hz, but this seemed like a bit of a hack. Anyone here have any suggestions?

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