private void Play(bool pickNewWav)
{
var trackCount = _tracks.Length;
// Do we need to pick a new wav to play first?
if (pickNewWav)
{
switch (_variation)
{
case VariationType.Ordered:
_wavIndex = (_wavIndex + 1) % trackCount;
break;
case VariationType.OrderedFromRandom:
_wavIndex = (_wavIndex + 1) % trackCount;
break;
case VariationType.Random:
if (_weights == null || trackCount == 1)
{
_wavIndex = XactHelpers.Random.Next() % trackCount;
}
else
{
var sum = XactHelpers.Random.Next(_totalWeights);
for (var i = 0; i < trackCount; i++)
{
sum -= _weights[i];
if (sum <= 0)
{
_wavIndex = i;
break;
}
}
}
break;
case VariationType.RandomNoImmediateRepeats:
{
if (_weights == null || trackCount == 1)
{
_wavIndex = XactHelpers.Random.Next() % trackCount;
}
else
{
var last = _wavIndex;
var sum = XactHelpers.Random.Next(_totalWeights);
for (var i = 0; i < trackCount; i++)
{
sum -= _weights[i];
if (sum <= 0)
{
_wavIndex = i;
break;
}
}
if (_wavIndex == last)
{
_wavIndex = (_wavIndex + 1) % trackCount;
}
}
break;
}
case VariationType.Shuffle:
// TODO: Need some sort of deck implementation.
_wavIndex = XactHelpers.Random.Next() % trackCount;
break;
}
;
}
_wav = _soundBank.GetSoundEffectInstance(_waveBanks[_wavIndex], _tracks[_wavIndex], out _streaming);
if (_wav == null)
{
// We couldn't create a sound effect instance, most likely
// because we've reached the sound pool limits.
return;
}
// Do all the randoms before we play.
if (_volumeVar.HasValue)
{
_trackVolume = _volumeVar.Value.X + ((float)XactHelpers.Random.NextDouble() * _volumeVar.Value.Y);
}
if (_pitchVar.HasValue)
{
_trackPitch = _pitchVar.Value.X + ((float)XactHelpers.Random.NextDouble() * _pitchVar.Value.Y);
}
if (_clip.FilterEnabled)
{
if (_filterVar.HasValue)
{
_trackFilterFrequency = _filterVar.Value.X + ((float)XactHelpers.Random.NextDouble() * _filterVar.Value.Y);
_trackFilterQFactor = _filterVar.Value.Z + ((float)XactHelpers.Random.NextDouble() * _filterVar.Value.W);
}
else
{
_trackFilterFrequency = _clip.FilterFrequency;
_trackFilterQFactor = _clip.FilterQ;
}
}
// This is a shortcut for infinite looping of a single track.
_wav.IsLooped = _loopCount == 255 && trackCount == 1;
// Update all the wave states then play.
UpdateState();
_wav.Play();
}
