osx man page for glutpostoverlayredisplay

glutPostOverlayRedisplay(3GLUT) 				       GLUT					   glutPostOverlayRedisplay(3GLUT)

NAME
       glutPostOverlayRedisplay,  glutPostWindowOverlayRedisplay  -  marks  the overlay of the current or specified window as needing to be redis-
       played.

SYNTAX
       #include <GLUT/glut.h>

       void glutPostOverlayRedisplay(void);
       void glutPostWindowOverlayRedisplay(int win);

DESCRIPTION
       Mark the overlay of current window as needing to be redisplayed.  The next iteration through glutMainLoop,  the	window's  overlay  display
       callback  (or  simply  the  display callback if no overlay display callback is registered) will be called to redisplay the window's overlay
       plane. Multiple calls to glutPostOverlayRedisplay before the next display callback opportunity (or overlay display callback opportunity	if
       one  is	registered)  generate only a single redisplay. glutPostOverlayRedisplay may be called within a window's display or overlay display
       callback to re-mark that window for redisplay.

       Logically, overlay damage notification for a window is treated as a glutPostOverlayRedisplay on the damaged window. Unlike damage  reported
       by  the	window	system,  glutPostOverlayRedisplay  will  not set to true the overlay's damaged status (returned by glutLayerGet(GLUT_OVER-
       LAY_DAMAGED).

       If the window you want to post an overlay redisplay on is not already current (and you do not require it to be immediately  made  current),
       using glutPostWindowOverlayRedisplay is more efficient that calling glutSetWindow to the desired window and then calling glutPostOverlayRe-
       display.

EXAMPLE
       If you are doing an interactive effect like rubberbanding in the overlay, it is a good idea to structure your rendering to minimize flicker
       (most  overlays are single-buffered).  Only clear the overlay if you know that the window has been damaged.  Otherwise, try to simply erase
       what you last drew and redraw it in an updated position.  Here is an example overlay display callback used to implement overlay rubberband-
       ing:

	 void
	 redrawOverlay(void)
	 {
	   static int prevStretchX, prevStretchY;

	   if (glutLayerGet(GLUT_OVERLAY_DAMAGED)) {
	     /* Damage means we needwindoay callback 4at theeeeeeeeeeeeeeey displayOverlayRedisplay - marks the
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	 }
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       The overlay display callback can b

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									3.7					   glutPostOverlayRedisplay(3GLUT)