CentOS 7.0 - man page for glutmenustatusfunc (centos section 3)
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glutMenuStatusFunc -- Modern variant of glutMenuStateFunc()
OpenGLUT - menucallback
glutMenuStatusFunc(void( *callback )( int status, int x, int y ));
callback Client menu status hook.
Broadly, OpenGLUT operates in two modes. At any given time, it is either in menu mode (with
a popup menu display, possibly with subitems) or it is not.
When moving from non-menu to menu status, callback (if defined) will be called with
GLUT_MENU_IN_USE . Conversely, when moving from menu to non-menu status, callback (if
defined) will be called with GLUT_MENU_NOT_IN_USE .
This differs from glutMenuStateFunc() in that callback is also given the x and y coor-
dinates of the mouse when the menu state transition took place.
This callback is bound to both the current window and the current menu .
Your callback is not actually called presently.
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