void PlayTone()
{
for (int i = 0; i < sines.Length; i++)
{
SineWaveSource swc = sines[i];
swc.phase = 0;
swc.phaseOffset = i * TWO_PI / sines.Length;
swc.duration = swc.envelope[swc.envelope.length - 1].time - swc.envelope[0].time;
swc.started = false;
sines[i] = swc;
}
if (!_source.isPlaying)
{
_source.Play();
}
}
void OnAudioFilterRead(float[] data, int channels)
{
double now = AudioSettings.dspTime;
double dspTimeIncrement = 1 / ((double)_sampleRate * envelopeTimeScale);
int expiredCount = 0;
for (int s = 0, sEnd = sines.Length; s < sEnd; s++)
{
SineWaveSource swc = sines[s];
if (!swc.started)
{
swc.startTime = now;
swc.started = true;
}
double age = (now - swc.startTime) / envelopeTimeScale;
float increment = frequencyMultiplier * swc.frequency * TWO_PI / _sampleRate;
for (int i = 0, iEnd = data.Length; i < iEnd; i += channels)
{
swc.phase += increment;
float envelope = Mathf.Max(swc.envelope.Evaluate((float)age), 0);
float value = (envelope * swc.gain * Mathf.Sin(swc.phase + swc.phaseOffset));
age += dspTimeIncrement;
data[i] += value;
if (channels == 2)
{
data[i + 1] += value;
}
}
sines[s] = swc;
if (!swc.loop && age > swc.duration)
{
expiredCount++;
}
}
}
