+ FREEGLUT_EXIT_IF_NOT_INITIALISED ( "glutPostRedisplay" );
+ if ( ! fgStructure.CurrentWindow )
+ {
+ fgError ( " ERROR: Function <%s> called"
+ " with no current window defined.", "glutPostRedisplay" ) ;
+ }
+
+ fgStructure.CurrentWindow->State.Redisplay = GL_TRUE;