glutgetwindowdata(3) centos man page | unix.com

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NAME
     glutGetWindowData -- Get the user data for the current window

LIBRARY
     OpenGLUT - window

SYNOPSIS
     #include <openglut.h>

     void*
     glutGetWindowData(void);

DESCRIPTION
     This function will return whatever  void*	value is associated with the  current window   via glutSetWindowData().  This is  NULL	if you did
     not associate a pointer with your window.	This can be useful in a situation where you have a single callback function performing services
     for many windows.	You  could   keep track of the	window id  s in a global list and search for the  current window   in that list.  But this
     is quicker than searching a data structure, and allows you to avoid the use of globals for this.

SEE ALSO
     glutSetWindowData(3)

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