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glutpostoverlayredisplay(3glut) [osx man page]

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
       o6s w_COLOR_BUFFER_BITglutCrea} esteck 4at theeeeUnample.  Heay(voi-d)
       lay - marks thIativi(urrent windglutCreas thBlutns w_LINE_LOOPglutCreas thVesplx2ide chorXow tchorYglutCreas thVesplx2ide chorXowLAY_DAMAGED)glutCreas thVesplx2idrGet(GLUT_OVERLAY_DAMAGED)glutCreas thVesplx2idrGet(GLUT_OVER tchorYglutCreas thEnd(glutCrea}.
	 }
       Iativi( thetInitWindBlutns w_LINE_LOOPglutCreathVesplx2ide chorXow tchorYglutCreathVesplx2ide chorXowsAMAGED)glutCreathVesplx2idsGLUT_OVERsAMAGED)glutCreathVesplx2idsGLUT_OVER tchorYglutCreathEnd(glutCrearGet(GLUT_OV =RsAMAGEDXlutCrearGet(GLUT_OY =RsAMAGEDY;e your program toNostceverla

       The overlay display callback can b

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GLUT
									3.7					   glutPostOverlayRedisplay(3GLUT)

Check Out this Related Man Page

glutOverlayDisplayFunc(3GLUT)					       GLUT					     glutOverlayDisplayFunc(3GLUT)

NAME

       glutOverlayDisplayFunc - sets the overlay display callback for the current window.

SYNTAX

       void glutOverlayDisplayFunc(void (*func)(void));

ARGUMENTS

       func	 The new overlay display callback function.

DESCRIPTION

       glutDisplayFunc sets the overlay display callback for the current window. The overlay display callback is functionally the same as the win-
       dow's display callback except that the overlay display callback is used to redisplay the window's overlay.

       When GLUT determines that the overlay plane for the window needs to be redisplayed, the overlay display callback for the window is  called.
       Before  the  callback,  the  current  window is set to the window needing to be redisplayed and the layer in use is set to the overlay. The
       overlay display callback is called with no parameters. The entire overlay region should be redisplayed in response to  the  callback  (this
       includes ancillary buffers if your program depends on their state).

       GLUT  determines when the overlay display callback should be triggered based on the window's overlay redisplay state. The overlay redisplay
       state for a window can be either set explicitly by calling glutPostOverlayRedisplay or implicitly as the result of window  damage  reported
       by the window system. Multiple posted overlay redisplays for a window are coalesced by GLUT to minimize the number of overlay display call-
       backs called.

       Upon return from the overlay display callback, the overlay damaged state of the window (returned by calling  glutLayerGet(GLUT_OVERLAY_DAM-
       AGED) is cleared.

       The  overlay display callback can be deregistered by passing NULL to glutOverlayDisplayFunc. The overlay display callback is initially NULL
       when an overlay is established. See glutDisplayFunc to understand how the display callback alone is used if an overlay display callback	is
       not registered.

SEE ALSO

       glutDisplayFunc, glutPostOverlayRedisplay

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT
									3.7					     glutOverlayDisplayFunc(3GLUT)
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