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glutpostredisplay(3glut) [osx man page]

glutPostRedisplay(3GLUT)					       GLUT						  glutPostRedisplay(3GLUT)

NAME
glutPostRedisplay, glutPostWindowRedisplay - marks the current or specified window as needing to be redisplayed. SYNTAX
#include <GLUT/glut.h> 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 win- dow as needing to be redisplayed. After either call, the next iteration through glutMainLoop, the window's display callback will be called to redisplay the window's normal plane. Multiple calls to glutPostRedisplay before the next display callback opportunity generates only a single redisplay callback. glutPostRedisplay may be called within a window's display or overlay display callback to re-mark that window for redisplay. Logically, normal plane damage notification for a window is treated as a glutPostRedisplay on the damaged window. Unlike damage reported by the window system, glutPostRedisplay 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 immediately 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) GLUT
3.7 glutPostRedisplay(3GLUT)

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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 redisplayed, the display callback for the window is called. Before the callback, 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 parameters. 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 call- back 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 routine 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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