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Chroma camera gets pygame MOUSEBUTTONDOWN events, can i get the same from GLUT ?

SDL 1.0 to 2.0 migration

The first change, simply enough, is that the mousewheel is no longer a button. This was a mistake of history, and we’ve corrected it in SDL 2.0. Look for SDL_MOUSEWHEEL events. We support both vertical and horizontal wheels, and some platforms can treat two-finger scrolling on a trackpad as wheel input, too. You will no longer receive SDL_BUTTONDOWN events for mouse wheels, and buttons 4 and 5 are real mouse buttons now.

From comment in glumpy source