Two new reserved channels for getting information from the mousewheel:
MOUSEWHEEL_DELTA_Y Returns the amount the wheel has moved on the Y axis.
MOUSEWHEEL_DELTA_X Returns the amount the wheel has moved on the X axis.
Mouse wheel reserved channels
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Is this for a mouse with a trackball in them? How would these work with a mouse that only has one direction?
Up and down uses Y, left and right uses X. I have never had a device I could check the x axis stuff with.