AudioMixer.hxx

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#ifndef AUDIOMIXER_HXX_
#define AUDIOMIXER_HXX_
 
#include <array>
#include <unordered_set>
#include <vector>
#include <memory>
#include <list>
 
#include "audio/Soundtrack.hxx"
#include "audio/AudioConfig.hxx"
#include "../util/Meta.hxx"
#include "../util/Singleton.hxx"
 
#include "AL/al.h"
#include "AL/alc.h"
 
#include "AL/alext.h" //header for OpenAL Soft
#include "AL/efx.h"
#include "AL/efx-presets.h"
 
template <typename Key, typename Value> using Mapping = std::unordered_map<Key, Value>;
template <typename Type, size_t N> using Array = std::array<Type, N>;
using string = std::string;
template <typename Type> using Vector = std::vector<Type>;
template <typename Type> using Set = std::unordered_set<Type>;
template <typename Type> using List = std::list<Type>;
 
struct Coordinate3D
{
  double x, y, z;
};
 
class AudioMixer : public Singleton<AudioMixer>
{
public:
  using DEFAULT_CHANNELS = Constant<4>;
 
  void setMusicVolume(float volume);
 
  void setSoundEffectVolume(float volume);
 
  void play(const SoundtrackID &id, int effect = AL_EFFECT_NULL);
 
  void play(const AudioTrigger &trigger, int effect = AL_EFFECT_NULL);
 
  void play(const SoundtrackID &id, const Coordinate3D &position, int effect = AL_EFFECT_NULL);
 
  void play(const AudioTrigger &trigger, const Coordinate3D &position, int effect = AL_EFFECT_NULL);
 
  void setMuted(bool isMuted);
 
  void stopAll();
 
  void prune();
 
  AudioMixer();
  ~AudioMixer();
  AudioMixer(const AudioMixer &) = delete;
  AudioMixer(AudioMixer &&) = delete;
  AudioMixer &operator=(const AudioMixer &) = delete;
  AudioMixer &operator=(AudioMixer &&) = delete;
 
  enum class ORIENTATION_INDEX : int
  {
    FORWARD_X = 0,
    FORWARD_Y = 1,
    FORWARD_Z = 2,
    UP_X = 3,
    UP_Y = 4,
    UP_Z = 5
  };
 
  enum class POSITION_INDEX : int
  {
    X = 0,
    Y = 1,
    Z = 2
  };
 
private:
  Vector<SoundtrackUPtr> m_Soundtracks;
 
  Array<Vector<SoundtrackID>, AudioTrigger::_size()> m_Triggers;
 
  Mapping<SoundtrackID, SoundtrackUPtr *> m_GetSound;
 
  List<SoundtrackUPtr *> m_Playing;
 
  /* Helpers */
 
  const char *get_al_error_msg(ALenum error);
 
  void playSoundtrack(SoundtrackUPtr &soundtrack);
 
  void playSoundtrackWithEffect(SoundtrackUPtr &soundtrack, int ALEffect);
  void onTrackFinished(int channelID);
 
  static std::function<void(int)> onTrackFinishedFunc;
 
  static void onTrackFinishedFuncPtr(int channelID) { onTrackFinishedFunc(channelID); }
 
  SoundtrackUPtr &getTrack(const AudioTrigger &trigger);
  SoundtrackUPtr &getTrack(const SoundtrackID &id);
 
  friend class Game;
 
  //OpenAL Soft sound setup variables
  ALCdevice *gAudioDevice;
 
  ALCcontext *alContext;
};
 
#endif