Is there any way to detect if a key is being held down while inside of the glutMouseFunc?
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Is there any way to detect if a key is being held down while inside of the glutMouseFunc?
Yes. Store a globally-accessible list of what keys are currently held down. Then read that list in your MouseFunc.
Note that the mouse callback already gets the control key state (shift/alt/ctrl), so you generally don’t need to do this.