audio_system.h

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#pragma once
 
#include "miniaudio/miniaudio.h"
#include "vec3.h"
#include <memory>
#include <string>
#include <unordered_map>
 
namespace audio {
 
// Forward declarations
class AudioGroup;
class Sound;
 
class AudioSystem {
 public:
  AudioSystem();
  
  ~AudioSystem();
 
  std::unique_ptr<Sound> CreateSound(const std::string& filepath, AudioGroup* group = nullptr);
 
  std::unique_ptr<AudioGroup> CreateGroup();
 
  void SetMasterVolume(float volume);
  
  float GetMasterVolume() const { return master_volume_; }
 
  
  void SetListenerPosition(const Vec3& position, ma_uint32 listenerIndex = 0);
  
  Vec3 GetListenerPosition(ma_uint32 listenerIndex = 0) const;
  
  void SetListenerDirection(const Vec3& direction, ma_uint32 listenerIndex = 0);
  
  Vec3 GetListenerDirection(ma_uint32 listenerIndex = 0) const;
  
  void SetListenerUp(const Vec3& up, ma_uint32 listenerIndex = 0);
  
  Vec3 GetListenerUp(ma_uint32 listenerIndex = 0) const;
  
  ma_engine* GetEngine() { return &engine_; }
  
 
 private:
  ma_engine engine_;                                      
  float master_volume_;                                   
  
  mutable Vec3 cached_listener_position_;                 
  mutable Vec3 cached_listener_direction_;               
  mutable Vec3 cached_listener_up_;                       
  mutable bool listener_state_dirty_;                     
};
 
}  // namespace audio