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

glutPostRedisplay
	glutPostRedisplay() -> None
glutPostWindowRedisplay
	glutPostWindowRedisplay(win) -> None

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

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.

glutPostOverlayRedisplay, glutDisplayFunc

Mark J. Kilgard (mjk@nvidia.com)