glutDisplayFunc man page on OpenSuSE

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glutDisplayFunc(3GLUT)		     GLUT		glutDisplayFunc(3GLUT)

NAME
       glutDisplayFunc - sets the display callback for the current window.

SYNTAX
       void glutDisplayFunc(void (*func)(void));

ARGUMENTS
       func	 The new display callback function.

DESCRIPTION
       glutDisplayFunc sets the display callback for the current window.  When
       GLUT determines that the normal plane for the window needs to be redis‐
       played, the display callback for the window is called. Before the call‐
       back, the current window is set to the window needing to be redisplayed
       and  (if no overlay display callback is registered) the layer in use is
       set to the normal plane. The display callback is called with no parame‐
       ters.  The entire normal plane region should be redisplayed in response
       to the callback	(this  includes	 ancillary  buffers  if	 your  program
       depends on their state).

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

       When an overlay is established for a window, but there  is  no  overlay
       display	callback  registered,  the display callback is used for redis‐
       playing both the overlay and normal plane (that is, it will  be	called
       if  either  the	redisplay state or overlay redisplay state is set). In
       this case, the layer in use is not implicitly changed on entry  to  the
       display callback.

       See glutOverlayDisplayFunc to understand how distinct callbacks for the
       overlay and normal plane of a window may be established.

       When a window is created, no display callback exists for the window. It
       is  the	responsibility of the programmer to install a display callback
       for the window before the window is shown. A display callback  must  be
       registered  for any window that is shown. If a window becomes displayed
       without a display callback being	 registered,  a	 fatal	error  occurs.
       Passing	NULL to glutDisplayFunc is illegal as of GLUT 3.0; there is no
       way to ``deregister'' a display callback (though another callback  rou‐
       tine can always be registered).

       Upon  return from the display callback, the normal damaged state of the
       window  (returned  by  calling	glutLayerGet(GLUT_NORMAL_DAMAGED)   is
       cleared. If there is no overlay display callback registered the overlay
       damaged	state  of  the	window	 (returned   by	  calling   glutLayer‐
       Get(GLUT_OVERLAY_DAMAGED) is also cleared.

SEE ALSO
       glutCreateMenu, glutPostRedisplay, glutOverlayDisplayFunc

AUTHOR
       Mark J. Kilgard (mjk@nvidia.com)

GLUT				      3.7		glutDisplayFunc(3GLUT)
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