public void ChannelStep(int cycles)
{
double cpuSpeedFactor = Spu.Device.SpeedFactor;
if (!Active)
{
return;
}
// Update volume.
_volumeEnvelope.Update(cycles);
float amplitude = ChannelVolume * _volumeEnvelope.Volume / 15.0f;
// Get elapsed gameboy time.
double timeDelta = (cycles / GameBoyCpu.OfficialClockFrequency) / cpuSpeedFactor;
// Allocate buffer.
int sampleRate = ChannelOutput.SampleRate;
int sampleCount = (int)(timeDelta * sampleRate) * 2;
using (var malloc = MemoryPool <float> .Shared.Rent(sampleCount))
{
var buffer = malloc.Memory.Span;
if (!UseSoundLength || _length >= 0)
{
double period = 1 / Frequency;
int periodSampleCount = (int)(period * sampleRate) * 2;
for (int i = 0; i < sampleCount; i += 2)
{
float sample = amplitude * (_lfsr.CurrentValue ? 1f : 0f);
Spu.WriteToSoundBuffer(ChannelNumber, buffer, i, sample);
_clock += 2;
if (_clock >= periodSampleCount)
{
_lfsr.PerformShift();
_clock -= periodSampleCount;
}
}
if (UseSoundLength)
{
_length -= timeDelta;
}
}
ChannelOutput.BufferSoundSamples(buffer, 0, sampleCount);
}
}
public void ChannelStep(int cycles)
{
double cpuSpeedFactor = Spu.Device.Cpu.SpeedFactor;
if (!Active || double.IsNaN(cpuSpeedFactor) || double.IsInfinity(cpuSpeedFactor) || cpuSpeedFactor < 0.5)
{
return;
}
// Update volume.
_volumeEnvelope.Update(cycles);
float amplitude = ChannelVolume * _volumeEnvelope.Volume / 15.0f;
// Get elapsed gameboy time.
double timeDelta = (cycles / GameBoyCpu.OfficialClockFrequency) / cpuSpeedFactor;
// Allocate buffer.
int sampleRate = ChannelOutput.SampleRate;
int sampleCount = (int)(timeDelta * sampleRate) * 2;
float[] buffer = new float[sampleCount];
if (!UseSoundLength || _length >= 0)
{
double period = 1 / Frequency;
int periodSampleCount = (int)(period * sampleRate) * 2;
for (int i = 0; i < buffer.Length; i += 2)
{
float sample = amplitude * (_lfsr.CurrentValue ? 1f : 0f);
Spu.WriteToSoundBuffer(ChannelNumber, buffer, i, sample);
_clock += 2;
if (_clock >= periodSampleCount)
{
_lfsr.PerformShift();
_clock -= periodSampleCount;
}
}
if (UseSoundLength)
{
_length -= timeDelta;
}
}
ChannelOutput.BufferSoundSamples(buffer, 0, buffer.Length);
}
