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simultaneous key presses in GLUT

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Hi, Does anyone know how to handle simultaneous key presses in GLUT? For example, I want my character to move diagonally if "w" and "d" are pressed together. Thanks

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- disable key repeat (glutIgnoreKeyRepeat(1))
- when a key is pressed (glutKeyboardFunc), set a value to 1 in an array
- when a key is released (glutKeyboardUpFunc), set the value to 0
- in your main loop, test for the combinations you want

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