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neonoblivion

How to calculate the ram used by a displist

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Display lists are in a black box. OpenGL does not expose very much queries about them.
At best you can query the system's memory (typically OS-dependant functions) before and after the display list compilation, but you're not even sure that when you call glEndList the list is compiled now : OpenGL leaves implementations free to deferr computations whenever needed.

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