glutVisibilityFunc(3GLUT) GLUT glutVisibilityFunc(3GLUT)NAMEglutVisibilityFunc - sets the visibility callback for the
current window.
SYNTAX
void glutVisibilityFunc(void (*func)(int state));
ARGUMENTS
func The new visibility callback function.
DESCRIPTIONglutVisibilityFunc 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_VIS
IBLE 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 visi
bility 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 visi
ble 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 visi
bility change will be reported.
SEE ALSO
glutCreateWindow, glutPopWindow
AUTHOR
Mark J. Kilgard (mjk@nvidia.com)
GLUT 3.7 1
