GLUT_OVERLAY_DISPLAY_CALLBACK 844 php_opengl/glut/php_glut.c call_user_callback(call_backs,GLUT_OVERLAY_DISPLAY_CALLBACK,0,NULL); GLUT_OVERLAY_DISPLAY_CALLBACK 853 php_opengl/glut/php_glut.c HASH_CALLBACK(callback, 1, GLUT_OVERLAY_DISPLAY_CALLBACK);