+ * Sets the mouse wheel callback for the current window
+ */
+void FGAPIENTRY glutMouseWheelFunc( void (* callback)( int, int, int, int ) )
+{
+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutMouseWheelFunc" );
+ SET_CALLBACK( MouseWheel );
+}
+
+/*
+ * Sets the mouse motion callback for the current window (one or more buttons
+ * are pressed)