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I’m new to OpenGL. I have written a programm before getting to know OpenGL display lists. By now, it’s pretty difficult to exploit them as my code contains many not ‘gl’ lines everywhere in between. So I’m curious how much I’ve lost in performance..
It depends, for static geometry, it can help quite a lot, but display lists are being deprecated in favor of VBOs (vertex buffer objects) and similar techniques that allow you to upload geometry data to the card once then just re-issue draw calls that use that data.
Display-lists (which was a nice idea in OpenGL 1.0) have turned out to be difficult to implement correctly in all corner cases, and are being phased out for more straightforward approaches.
However, if all you cache are geometry data, then by all means, lists are ok. But VBOs are the future so I’d suggest to learn those.