public HuC6280PSG()
{
MaxVolume = short.MaxValue;
Waves.InitWaves();
for (int i = 0; i < 8; i++)
{
Channels[i] = new PSGChannel();
}
}
public HuC6280PSG(int spf)
{
_spf = spf;
Waves.InitWaves();
for (int i = 0; i < 8; i++)
{
Channels[i] = new PSGChannel();
}
}
public HuC6280PSG()
{
MaxVolume = short.MaxValue;
Waves.InitWaves();
for (int i = 0; i < 8; i++)
{
Channels[i] = new PSGChannel();
}
}
void MixChannel(short[] samples, int start, int len, PSGChannel channel)
{
if (channel.Enabled == false) return;
if (channel.DDA == false && channel.Volume == 0) return;
short[] wave = channel.Wave;
int freq;
if (channel.NoiseChannel)
{
wave = Waves.NoiseWave;
freq = channel.NoiseFreq;
}
else if (channel.DDA)
{
freq = 0;
}
else
{
if (channel.Frequency <= 1) return;
freq = PsgBase / (32 * ((int)channel.Frequency));
}
int globalPanFactorLeft = VolumeReductionTable[MainVolumeLeft];
int globalPanFactorRight = VolumeReductionTable[MainVolumeRight];
int channelPanFactorLeft = VolumeReductionTable[channel.Panning >> 4];
int channelPanFactorRight = VolumeReductionTable[channel.Panning & 0xF];
int channelVolumeFactor = 0x1f - channel.Volume;
int volumeLeft = 0x1F - globalPanFactorLeft - channelPanFactorLeft - channelVolumeFactor;
if (volumeLeft < 0)
volumeLeft = 0;
int volumeRight = 0x1F - globalPanFactorRight - channelPanFactorRight - channelVolumeFactor;
if (volumeRight < 0)
volumeRight = 0;
float adjustedWaveLengthInSamples = SampleRate / (channel.NoiseChannel ? freq / (float)(channel.Wave.Length * 128) : freq);
float moveThroughWaveRate = wave.Length / adjustedWaveLengthInSamples;
int end = start + len;
for (int i = start; i < end; )
{
channel.SampleOffset %= wave.Length;
short value = channel.DDA ? channel.DDAValue : wave[(int)channel.SampleOffset];
samples[i++] += (short)(value * LogScale[volumeLeft] / 255f / 6f * MaxVolume / short.MaxValue);
samples[i++] += (short)(value * LogScale[volumeRight] / 255f / 6f * MaxVolume / short.MaxValue);
channel.SampleOffset += moveThroughWaveRate;
channel.SampleOffset %= wave.Length;
}
}
private void MixChannel(short[] samples, int start, int len, PSGChannel channel)
{
if (channel.Enabled == false)
{
return;
}
if (channel.DDA == false && channel.Volume == 0)
{
return;
}
short[] wave = channel.Wave;
int freq;
if (channel.NoiseChannel)
{
wave = Waves.NoiseWave;
freq = channel.NoiseFreq;
}
else if (channel.DDA)
{
freq = 0;
}
else
{
if (channel.Frequency <= 1)
{
return;
}
freq = PsgBase / (32 * ((int)channel.Frequency));
}
int globalPanFactorLeft = VolumeReductionTable[MainVolumeLeft];
int globalPanFactorRight = VolumeReductionTable[MainVolumeRight];
int channelPanFactorLeft = VolumeReductionTable[channel.Panning >> 4];
int channelPanFactorRight = VolumeReductionTable[channel.Panning & 0xF];
int channelVolumeFactor = 0x1f - channel.Volume;
int volumeLeft = 0x1F - globalPanFactorLeft - channelPanFactorLeft - channelVolumeFactor;
if (volumeLeft < 0)
{
volumeLeft = 0;
}
int volumeRight = 0x1F - globalPanFactorRight - channelPanFactorRight - channelVolumeFactor;
if (volumeRight < 0)
{
volumeRight = 0;
}
float adjustedWaveLengthInSamples = SampleRate / (channel.NoiseChannel ? freq / (float)(channel.Wave.Length * 128) : freq);
float moveThroughWaveRate = wave.Length / adjustedWaveLengthInSamples;
int end = start + len;
for (int i = start; i < end;)
{
channel.SampleOffset %= wave.Length;
short value = channel.DDA ? channel.DDAValue : wave[(int)channel.SampleOffset];
samples[i++] += (short)(value * LogScale[volumeLeft] / 255f / 6f * MaxVolume / short.MaxValue);
samples[i++] += (short)(value * LogScale[volumeRight] / 255f / 6f * MaxVolume / short.MaxValue);
channel.SampleOffset += moveThroughWaveRate;
channel.SampleOffset %= wave.Length;
}
}
