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Do I have to clean up all DisplayLists, Textures, (Geometry-)Shaders and so on by hand via the glDelete* functions, or does the GPU mem get freed automagically when my Program exits/crashes?
Note: GPU mem refers to dedicated memory on a dedicated Graphics card, not CPU memory.
Free the context, everything else is local to the context (unless you enabled display list sharing) and will go away along with it.