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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 win-dow window
       dow 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(3G), glutPopWindow(3G)


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



GLUT                                                 3.7                           glutVisibilityFunc(3GLUT)