class App {
public:
    struct Config {};

    //Configure game settings (video, audio, input, net)
    //false if cancel or failed
    bool Configure(Config const& cfg);

    //Start app. return state
    int Go();

    void Shutdown();
protected:
    //Init all subsystems. from Go. return state
    int _init();

    //maybe 'resource sets'
    int LoadResources();

    //use loaded resources
    int SetupWorld(); //setup scene?

    //Start main loop and all subsystem threads
    void _start();

    //'Hard' shutdown
    void _shutdown();
};