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glutshowoverlay(3glut) [osx man page]

glutShowOverlay(3GLUT)						       GLUT						    glutShowOverlay(3GLUT)

glutShowOverlay, glutHideOverlay - shows or hides the overlay of the current window SYNTAX
#include <GLUT/glut.h> void glutShowOverlay(void); void glutHideOverlay(void); DESCRIPTION
glutShowOverlay shows the overlay of the current window; glutHideOverlay hides the overlay. The effect of showing or hiding an overlay takes place immediately. Note that glutShowOverlay will not actually display the overlay unless the window is also shown (and even a shown window may be obscured by other windows, thereby obscuring the overlay). It is typically faster and less resource intensive to use these routines to control the display status of an overlay as opposed to removing and re-establishing the overlay. SEE ALSO
glutEstablishOverlay, glutShowWindow AUTHOR
Mark J. Kilgard ( GLUT
3.7 glutShowOverlay(3GLUT)

Check Out this Related Man Page

glutOverlayDisplayFunc(3GLUT)					       GLUT					     glutOverlayDisplayFunc(3GLUT)

glutOverlayDisplayFunc - sets the overlay display callback for the current window. SYNTAX
#include <GLUT/glut.h> 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 ( GLUT
3.7 glutOverlayDisplayFunc(3GLUT)
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