glutWindowStatusFunc man page
glutWindowStatusFunc — Sets the window status callback.
OpenGLUT - windowcallback
glutWindowStatusFunc(void( *callback )( int state ));
Client window status hook.
When the visibility status of your window changes, OpenGLUT either invokes the
registered by this function or the Visibility
neither, if you have not registered either callback.
This differs from glutVisbilityFunc() in that the callback has three states, rather than two, that it may receive. These states are:
(every pixel visible)
(every pixel obscured)
The callback is bound to the
Makes glutVisibilityFunc() obsolete.
glutPopWindow(3), glutPushWindow(3), glutShowWindow(3), glutVisibilityFunc(3).