#pragma once
#include <AL/al.h>
#include "physics.h"

#define SOUND_REFERENCE_DIST  500.
#define SOUND_MAX_DIST    1000.

// Virtual voice.
typedef struct alVoice_ {
  ALuint source; // Source itself, 0 if not set.
  ALuint buffer; // Buffer.

  int priority;  // Base priority.

  double px, py; // Position.
  double vx, vy; // Velocity.

  unsigned int start; // Time started in ms.
  unsigned int flags; // Flags to set properties.
} alVoice;

// Sound subsystem.
int sound_init(void);
void sound_exit(void);
void sound_update(void);

// Sound manupulation functions.
ALuint sound_get(char* name);
void sound_volume(const double vol);

// Voice manipulation function.
alVoice* sound_addVoice(int priority, double px, double py, double vx, double vy,
                        const ALuint buffer, const int looping);

void sound_delVoice(alVoice* voice);
void voice_update(alVoice* voice, double px, double py, double vx, double vy);
void sound_listener(double dir, double px, double py, double vx, double vy);