GLUT_IDLE_CALLBACK 1319 php_opengl/glut/php_glut.c call_user_callback(call_backs,GLUT_IDLE_CALLBACK,0,NULL); GLUT_IDLE_CALLBACK 1328 php_opengl/glut/php_glut.c HASH_CALLBACK(callback, 1, GLUT_IDLE_CALLBACK);