OpenGL viewing notes - Bryn Mawr Computer Science

Idle Callback
Minimize the amount of computation done in
an idle callback.
If using idle for animation, stop rendering
when nothing changed, or window not
visible
glutVisibilityFunc(visible);
void visible(int vis) {
if (vis == GLUT_VISIBLE)
glutIdleFunc(idle);
else
glutIdleFunc(NULL);
}