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I'd be interested to see any proof-of-concept / minimal code that does this *cleanly*. (I tackled the same problem a few months ago with no Cocoa knowledge at all and ended up with a solution that I found... gross)
Depends how “native” you are. If you’re comfortable with platform conventions (runloops, dispatch, CVDisplayLink, Cocoa event delegation), it’s fairly simple to be clean. If you try to hammer everything into a while(1) loop, poll input devices, and draw “on-demand,” not so simple
