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Detecting Ctrl-<Number> in GLUT

I use GLUT to handle keyboard input for Bitfighter. I've built a nice little keyboard event abstraction layer, which works great for most things, but I've run up against a few frustrating limitations.

For example, when Ctrl is pressed, the number keys, plus, minus, and the quote key don't seem to trigger the glutKeyboardFunc() callback.

I realize that GLUT is very limited in some ways, but I was wondering if anyone knows if it is possible to detect the number keys or plus/minus when Ctrl is pressed.

I would consider switching to FreeGLUT if it helped work around this limitation.

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