[cl-opengl-devel] GLUT handling for a mouse wheel

[Charlie McMackin]

Having a GLUT window die on me because I accidentally scroll the mouse
wheel down finally drove me mad enough to go track the problem down.
I'm not sure if this is the correct way to do it, but weighing in at
one line sexp it sure feels good. I picked :wheel-down but I guess any
keyword can be put in it's place.

the change: in glut/callbacks.lisp add (:wheel-down -1) to the
mouse-button-state cenum.

Charlie Mac
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