using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
namespace BizHawk.Emulation.Sound
{
/*
* old VRC6 audio.
* not quite a drop in replacement for the new one.
* doesn't sound right.
*/
class VRC6 : ISoundProvider
{
public void DiscardSamples() { }
public int MaxVolume { get; set; }
public void GetSamples(short[] samples)
{
for (int i = 0; i < samples.Length; )
{
short val = 0;
val = (short)(Pulse1.RenderSample() << 4);
val += (short)(Pulse2.RenderSample() << 7);
val += (short)(Sawtooth.RenderSample() << 7);
samples[i++] = val;
samples[i++] = val;
}
}
public VRC6()
{
MaxVolume = (short.MaxValue / 3);
}
public void SyncState(Serializer ser)
{
Pulse1.SyncState(ser);
Pulse2.SyncState(ser);
Sawtooth.SyncState(ser);
}
public void Write9000(byte value)
{
Pulse1.Write9000(value);
}
public void Write9001(byte value)
{
Pulse1.Write9001(value);
}
public void Write9002(byte value)
{
Pulse1.Write9002(value);
}
public void WriteA000(byte value)
{
Pulse2.WriteA000(value);
}
public void WriteA001(byte value)
{
Pulse2.WriteA001(value);
}
public void WriteA002(byte value)
{
Pulse2.WriteA002(value);
}
public void WriteB000(byte value)
{
Sawtooth.WriteB000(value);
}
public void WriteB001(byte value)
{
Sawtooth.WriteB001(value);
}
public void WriteB002(byte value)
{
Sawtooth.WriteB002(value);
}
private Chn_VRC6Pulse1 Pulse1 = new Chn_VRC6Pulse1();
private Chn_VRC6Pulse2 Pulse2 = new Chn_VRC6Pulse2();
private Chn_VRC6Sawtooth Sawtooth = new Chn_VRC6Sawtooth();
public class Chn_VRC6Pulse1
{
byte _Volume = 0;
double DutyPercentage = 0;
int _DutyCycle = 0;
int _FreqTimer = 0;
bool _Enabled = false;
double _Frequency = 0;
double _SampleCount = 0;
double _RenderedLength = 0;
bool WaveStatus = false;
short OUT = 0;
public void SyncState(Serializer ser)
{
ser.Sync("_Volume", ref _Volume);
//ser.Sync("DutyPercentage", ref DutyPercentage);
ser.Sync("_DutyCycle", ref _DutyCycle);
ser.Sync("_FreqTimer", ref _FreqTimer);
ser.Sync("_Enabled", ref _Enabled);
//ser.Sync("_Frequency", ref _Frequency);
//ser.Sync("_SampleCount", ref _SampleCount);
//ser.Sync("_RenderedLength", ref _RenderedLength);
ser.Sync("WaveStatus", ref WaveStatus);
ser.Sync("OUT", ref OUT);
}
public short RenderSample()
{
if (_Enabled)
{
_SampleCount++;
if (WaveStatus && (_SampleCount > (_RenderedLength * DutyPercentage)))
{
_SampleCount -= _RenderedLength * DutyPercentage;
WaveStatus = !WaveStatus;
}
else if (!WaveStatus && (_SampleCount > (_RenderedLength * (1.0 - DutyPercentage))))
{
_SampleCount -= _RenderedLength * (1.0 - DutyPercentage);
WaveStatus = !WaveStatus;
}
if (WaveStatus)
OUT = (short)(-_Volume);
else
OUT = (short)(_Volume);
return OUT;
}
return 0;
}
public void Write9000(byte data)
{
_Volume = (byte)(data & 0x0F);//Bit 0 - 3
_DutyCycle = (data >> 4); //Bit 4 - 7
if (_DutyCycle == 0)
DutyPercentage = 0.6250;
else if (_DutyCycle == 1)
DutyPercentage = 0.1250;
else if (_DutyCycle == 2)
DutyPercentage = 0.1875;
else if (_DutyCycle == 3)
DutyPercentage = 0.2500;
else if (_DutyCycle == 4)
DutyPercentage = 0.3125;
else if (_DutyCycle == 5)
DutyPercentage = 0.3750;
else if (_DutyCycle == 6)
DutyPercentage = 0.4375;
else if (_DutyCycle == 7)
DutyPercentage = 0.5000;
else
DutyPercentage = 1.0;
}
public void Write9001(byte data)
{
_FreqTimer = (_FreqTimer & 0x0F00) | data;
//Update freq
_Frequency = 1790000 / 16 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
public void Write9002(byte data)
{
_FreqTimer = (_FreqTimer & 0x00FF) | ((data & 0x0F) << 8);
_Enabled = (data & 0x80) != 0;
//Update freq
_Frequency = 1790000 / 16 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
}
public class Chn_VRC6Pulse2
{
byte _Volume = 0;
double DutyPercentage = 0;
int _DutyCycle = 0;
int _FreqTimer = 0;
bool _Enabled = false;
double _Frequency = 0;
double _SampleCount = 0;
double _RenderedLength = 0;
bool WaveStatus = false;
short OUT = 0;
public void SyncState(Serializer ser)
{
ser.Sync("_Volume", ref _Volume);
//ser.Sync("DutyPercentage", ref DutyPercentage);
ser.Sync("_DutyCycle", ref _DutyCycle);
ser.Sync("_FreqTimer", ref _FreqTimer);
ser.Sync("_Enabled", ref _Enabled);
//ser.Sync("_Frequency", ref _Frequency);
//ser.Sync("_SampleCount", ref _SampleCount);
//ser.Sync("_RenderedLength", ref _RenderedLength);
ser.Sync("WaveStatus", ref WaveStatus);
ser.Sync("OUT", ref OUT);
}
public short RenderSample()
{
if (_Enabled)
{
_SampleCount++;
if (WaveStatus && (_SampleCount > (_RenderedLength * DutyPercentage)))
{
_SampleCount -= _RenderedLength * DutyPercentage;
WaveStatus = !WaveStatus;
}
else if (!WaveStatus && (_SampleCount > (_RenderedLength * (1.0 - DutyPercentage))))
{
_SampleCount -= _RenderedLength * (1.0 - DutyPercentage);
WaveStatus = !WaveStatus;
}
if (WaveStatus)
OUT = (short)(-_Volume);
else
OUT = (short)(_Volume);
return OUT;
}
return 0;
}
public void WriteA000(byte data)
{
_Volume = (byte)(data & 0x0F);//Bit 0 - 3
_DutyCycle = (data >> 4); //Bit 4 - 7
if (_DutyCycle == 0)
DutyPercentage = 0.6250;
else if (_DutyCycle == 1)
DutyPercentage = 0.1250;
else if (_DutyCycle == 2)
DutyPercentage = 0.1875;
else if (_DutyCycle == 3)
DutyPercentage = 0.2500;
else if (_DutyCycle == 4)
DutyPercentage = 0.3125;
else if (_DutyCycle == 5)
DutyPercentage = 0.3750;
else if (_DutyCycle == 6)
DutyPercentage = 0.4375;
else if (_DutyCycle == 7)
DutyPercentage = 0.5000;
else
DutyPercentage = 1.0;
}
public void WriteA001(byte data)
{
_FreqTimer = (_FreqTimer & 0x0F00) | data;
//Update freq
_Frequency = 1790000 / 16 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
public void WriteA002(byte data)
{
_FreqTimer = (_FreqTimer & 0x00FF) | ((data & 0x0F) << 8);
_Enabled = (data & 0x80) != 0;
//Update freq
_Frequency = 1790000 / 16 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
}
public class Chn_VRC6Sawtooth
{
byte AccumRate = 0;
byte AccumStep = 0;
byte Accum = 0;
int _FreqTimer = 0;
bool _Enabled = false;
double _Frequency = 0;
double _SampleCount = 0;
double _RenderedLength = 0;
short OUT = 0;
public void SyncState(Serializer ser)
{
ser.Sync("AccumRate", ref AccumRate);
ser.Sync("AccumStep", ref AccumStep);
ser.Sync("Accum", ref Accum);
ser.Sync("_FreqTimer", ref _FreqTimer);
ser.Sync("_Enabled", ref _Enabled);
//ser.Sync("_Frequency", ref _Frequency);
//ser.Sync("_SampleCount", ref _SampleCount);
//ser.Sync("_RenderedLength", ref _RenderedLength);
ser.Sync("OUT", ref OUT);
}
public short RenderSample()
{
if (_Enabled)
{
_SampleCount++;
if (_SampleCount >= _RenderedLength)
{
_SampleCount -= _RenderedLength;
AccumStep++;
if ((AccumStep & 2) != 0)
Accum += AccumRate;
if (AccumStep >= 14)
AccumStep = Accum = 0;
OUT = (short)(Accum >> 3);
}
return (short)((OUT - 5));
}
return 0;
}
public void WriteB000(byte data)
{
AccumRate = (byte)(data & 0x3F);
}
public void WriteB001(byte data)
{
_FreqTimer = (_FreqTimer & 0x0F00) | data;
//Update freq
_Frequency = 1790000 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
public void WriteB002(byte data)
{
_FreqTimer = (_FreqTimer & 0x00FF) | ((data & 0x0F) << 8);
_Enabled = (data & 0x80) != 0;
//Update freq
_Frequency = 1790000 / (_FreqTimer + 1);
_RenderedLength = 44100 / _Frequency;
}
}
}
}
