SDLMain.hpp

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#ifndef SDLMAIN_HPP
#define SDLMAIN_HPP
/*
This file is part of AlgAudio.

AlgAudio, Copyright (C) 2015 CeTA - Audiovisual Technology Center

AlgAudio is free software: you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as
published by the Free Software Foundation, either version 3 of the
License, or (at your option) any later version.

AlgAudio is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
GNU Lesser General Public License for more details.

You should have received a copy of the GNU Lesser General Public License
along with AlgAudio.  If not, see <http://www.gnu.org/licenses/>.
*/
#include <map>
#include <memory>
#include <atomic>

#include "Window.hpp"

union SDL_Event;

namespace AlgAudio{

class SDLMain{
private:
  SDLMain() = delete; // static class
public:
  static void Init();
  static void Quit();
  static void Loop();
  static void Step();
  static void RegisterWindow(std::shared_ptr<Window>);
  static void UnregisterWindow(std::shared_ptr<Window>);
  static void UnregisterAll();
  static unsigned int GetWindowNum() {return registered_windows.size();}

  static Signal<float> on_before_frame;

  // These two funcitions are used by i/o threads to notify the main loop that
  // there is some input ready to be processed. These functions are thread-safe.
  // They send a custom SDL_UserEvent to the main event queue, effectivelly
  // waking up the main thread.
  static void PushNotifySubprocessEvent();
  static void PushNotifyOSCEvent();
  static std::atomic<int> notify_event_id;

  static void SetTextInput(bool);

  static std::atomic_bool running;
  
  enum CustomEventCodes{
    NOTIFY_SUBPROCESS,
    NOTIFY_OSC,
    NOTIFY_TIMER,
  };
private:
  static std::map<unsigned int, std::shared_ptr<Window>> registered_windows;
  static void ProcessEvent(const SDL_Event&);
  static int last_draw_time;

  // These flags indicate whether a notify event is already in SDL queue.
  // This allows limiting the number of such events in queue to 1, to avoid
  // flooding the queue with same events, in case multile osc messages arrive
  // simultaneously.
  static std::atomic_flag ev_flag_notify_osc_already_pushed;
  static std::atomic_flag ev_flag_notify_subprocess_already_pushed;
};

} // namespace AlgAudio

#endif // SDLMAIN_HPP