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glutVisibilityFunc(3GLUT)            GLUT            glutVisibilityFunc(3GLUT)


NAME

       glutVisibilityFunc - sets the visibility callback for the current
       window.


SYNTAX


       void glutVisibilityFunc(void (*func)(int state));


ARGUMENTS

       func      The new visibility callback function.


DESCRIPTION

       glutVisibilityFunc sets the visibility callback for the current window.
       The visibility callback for a window is called when the visibility of a
       window changes. The state callback parameter is either GLUT_NOT_VISIBLE
       or GLUT_VISIBLE depending on the current visibility of the window.
       GLUT_VISIBLE does not distinguish a window being totally versus
       partially visible. GLUT_NOT_VISIBLE means no part of the window is
       visible, i.e., until the window's visibility changes, all further
       rendering to the window is discarded.

       GLUT considers a window visible if any pixel of the window is visible
       or any pixel of any descendant window is visible on the screen.

       Passing NULL to glutVisibilityFunc disables the generation of the
       visibility callback.

       If the visibility callback for a window is disabled and later re-
       enabled, the visibility status of the window is undefined; any change
       in window visibility will be reported, that is if you disable a
       visibility callback and re-enable the callback, you are guaranteed the
       next visibility change will be reported.


SEE ALSO

       glutCreateWindow, glutPopWindow


AUTHOR

       Mark J. Kilgard (mjk@nvidia.com)

GLUT                                  3.7            glutVisibilityFunc(3GLUT)

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