/// <summary>
/// Applies 3D settings to a cue.
/// </summary>
void Update3DSettings(Cue3D cue3D)
{
for (int i = 0; i < listeners.Count; i++)
{
cue3D.Cues[i].Apply3D(listeners[i], cue3D.Emitter);
}
}
/// <summary>
/// Plays a sound in 3D to all the AudioListeners listed in Listeners.
/// </summary>
/// <param name="cueName">Name of the sound to be played.</param>
/// <param name="emitter">The emitter of the sound.</param>
/// <remarks>If there are no listeners, then the sound is just played normally.</remarks>
/// <param name="variables">Variables to be applied to the cue.</param>
public void Play(string cueName, AudioEmitter emitter, params CueVariable[] variables)
{
// Play the cue normally if there are no listeners for 3D sound.
if (listeners.Count == 0)
{
Play(cueName);
return;
}
if (!isInitialized)
{
throw new Exception("Audio system must be initialized.");
}
// Generate a cue instance for each listener
List <Cue> cues = new List <Cue>(listeners.Count);
for (int i = 0; i < listeners.Count; i++)
{
Cue cue = soundBank.GetCue(cueName);
for (int v = 0; v < variables.Length; v++)
{
variables[v].Apply(cue);
}
cues.Add(soundBank.GetCue(cueName));
}
// Get an inactive instance if available
Cue3D cue3D;
if (inactiveCue3Ds.Count > 0)
{
cue3D = inactiveCue3Ds.Dequeue();
cue3D.Cues = cues;
cue3D.Emitter = emitter;
}
else
{
// we need to create a new one
cue3D = new Cue3D(cues, emitter);
}
// apply the 3D settings for this listener
Update3DSettings(cue3D);
// play the cue
cue3D.Play();
// add to the activeCue3Ds list.
activeCue3Ds.Add(cue3D);
}
/// <summary>
/// Updates the AudioSystem.
/// </summary>
protected override void UpdateCore(GameTime gameTime)
{
if (!isInitialized)
{
return;
}
// Remove cues from the activeCues list which have stopped.
for (int i = activeCues.Count - 1; i >= 0; i--)
{
if (activeCues[i].IsStopped)
{
activeCues.RemoveAt(i);
}
}
// Update 3D cues.
for (int i = activeCue3Ds.Count - 1; i >= 0; i--)
{
Cue3D cue3D = activeCue3Ds[i];
if (cue3D.Cues[0].IsStopped)
{
// If the cue has stopped playing, dispose it.
cue3D.DisposeCues();
// Store the Cue3D instance for future reuse.
inactiveCue3Ds.Enqueue(cue3D);
// Remove it from the active list.
activeCue3Ds.RemoveAt(i);
}
else
{
// If the cue is still playing, update its 3D settings.
Update3DSettings(cue3D);
}
}
// Update the audio engine.
audioEngine.Update();
}