audio_volume.hpp

 
#pragma once
#include <toast/export.hpp>
#include <toast/world/box.hpp>
#include <toast/world/volume.hpp>
#include <vector>
 
namespace toast {
class AudioListener;

class TOAST_API [[ToastNode, Hidden, Interface, Color("Beige")]] AudioVolume : public Volume {
public:
  virtual void onAudioTargetEnter(const VolumeTarget& target) = 0;
  virtual void onAudioTargetExit(const VolumeTarget& target) = 0;
  void resetAccumulators() override;
  void finalizeAccumulators();
 
  void setListeners(const std::vector<Box<AudioListener>>& listeners);
 
protected:
  [[nodiscard]]
  auto trackTarget(const VolumeTarget& target, bool inside) -> bool;    
  [[nodiscard]]
  auto hasListenersInside() const -> bool;
 
  virtual void onVolumeTick() { }    
 
private:
  void begin();
  void end();
  void onEnable();
  void onDisable();
  void lateTick();
 
  struct ListenerState {
    VolumeTarget target;
    bool inside = false;
  };
 
  std::vector<ListenerState> m_listeners_inside;
  std::vector<ListenerState> m_pending_targets;
  std::vector<Box<AudioListener>> m_listeners;
};
 
}