glutPostRedisplay,  glutPostWindowRedisplay  -  marks  the
       current or specified window as needing to be  redisplayed.

SYNTAX

       void glutPostRedisplay(void);
       void glutPostWindowRedisplay(int win);

DESCRIPTION

       glutPostRedisplay marks the normal plane of current window
       as needing  to  be  redisplayed.   glutPostWindowRedisplay
       works  the  specified window as needing to be redisplayed.
       After either call, the next  iteration  through  glutMain-
       Loop,  the  window's  display  callback  will be called to
       redisplay the window's normal  plane.  Multiple  calls  to
       glutPostRedisplay  before the next display callback oppor-
       tunity generates only a single redisplay callback.   glut-
       PostRedisplay  may  be called within a window's display or
       overlay display callback to re-mark that window for redis-
       play.

       Logically,  normal  plane damage notification for a window
       is treated as a glutPostRedisplay on the  damaged  window.
       Unlike  damage  reported by the window system, glutPostRe-
       display will not set to true the  normal  plane's  damaged
       status (returned by glutLayerGet(GLUT_NORMAL_DAMAGED).

       If  the  window  you  want  to  post a redisplay on is not
       already current (and you do not require it to  be  immedi-
       ately made current), using glutPostWindowRedisplay is more
       efficient that calling glutSetWindow to the desired window
       and then calling glutPostRedisplay.

SEE ALSO

       glutPostOverlayRedisplay, glutDisplayFunc

AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)