mainLoop package:GLUT

Enter the GLUT event processing loop; it will call as necessary any callbacks that have been registered. This routine should be called at most once in a GLUT program.

(freeglut only) Process one iteration's worth of events in its event loop. This allows the application to control its own event loop and still use the GLUT package.

Return from mainLoop when any window is closed.

(freeglut only) Stop the event loop. If actionOnWindowClose contains Exit, the application will exit; otherwise control will return to the function which called mainLoop. If the application has two nested calls to mainLoop and calls leaveMainLoop, the behaviour is undefined. It may leave only the inner nested loop or it may leave both loops. If the reader has a strong preference for one behaviour over the other he should contact the freeglut Programming Consortium and ask for the code to be fixed.