Cleaning up when exiting an OpenGL app

Question

I have an an OSX OpenGL app I'm trying to modify. When I create the app a whole bunch of initialisation functions are called -- including methods where I can specify my own mouse and keyboard handlers etc. For example:

glutInit(&argc, argv);
glutInitDisplayMode(GLUT_DEPTH | GLUT_DOUBLE | GLUT_RGBA);
glutInitWindowPosition(100, 100);
glutInitWindowSize(700, 700);
glutCreateWindow("Map Abstraction");
glutReshapeFunc(resizeWindow);
glutDisplayFunc(renderScene);
glutIdleFunc(renderScene);
glutMouseFunc(mousePressedButton);
glutMotionFunc(mouseMovedButton);
glutKeyboardFunc(keyPressed);

At some point I pass control to glutMainLoop and my application runs. In the process of running I create a whole bunch of objects. I'd like to clean these up. Is there any way I can tell GLUT to call a cleanup method before it quits?

Answer 1

In freeglut if you call this:

glutSetOption(GLUT_ACTION_ON_WINDOW_CLOSE, GLUT_ACTION_CONTINUE_EXECUTION)

Prior to entering the main loop, then when the window closes the main loop function will return and you can do your cleanup.

It's worth noting that at that stage the GL context has already been destroyed so you can't perform any GL operations.