glutLeaveMainLoop - Man Page
Breaks out of OpenGLUT's glutMainLoop()
Library
OpenGLUT - mainloop
Synopsis
#include <openglut.h>
void
glutLeaveMainLoop(void);
Description
This function allows you to unilaterally tell OpenGLUT that you are done and wish to exit. This is useful if you have also told OpenGLUT to return to you rather than to call exit() directly.
Todo
Could use longjmp(); see oghTakeActionOnWindowClose(). This would let us terminate the entire loop immediately.