forked from sin365/AxibugEmuOnline
475 lines
15 KiB
C#
475 lines
15 KiB
C#
using System;
|
|
using static VirtualNes.Core.APU_FME7;
|
|
|
|
namespace VirtualNes.Core
|
|
{
|
|
public class APU_FME7 : APU_INTERFACE
|
|
{
|
|
// Envelope tables
|
|
byte[] envelope_pulse0 = {
|
|
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18,
|
|
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
|
|
0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
|
|
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
|
|
};
|
|
byte[] envelope_pulse1 = {
|
|
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x00
|
|
};
|
|
byte[] envelope_pulse2 = {
|
|
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18,
|
|
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
|
|
0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
|
|
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x1F
|
|
};
|
|
byte[] envelope_pulse3 = {
|
|
0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x1F
|
|
};
|
|
sbyte[] envstep_pulse = {
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 0
|
|
};
|
|
|
|
byte[] envelope_sawtooth0 = {
|
|
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18,
|
|
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
|
|
0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
|
|
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
|
|
};
|
|
byte[] envelope_sawtooth1 = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F
|
|
};
|
|
sbyte[] envstep_sawtooth = {
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, -15
|
|
};
|
|
|
|
byte[] envelope_triangle0 = {
|
|
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18,
|
|
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
|
|
0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
|
|
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00,
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F
|
|
};
|
|
byte[] envelope_triangle1 = {
|
|
0x00, 0x01, 0x02, 0x03, 0x04, 0x05, 0x06, 0x07,
|
|
0x08, 0x09, 0x0A, 0x0B, 0x0C, 0x0D, 0x0E, 0x0F,
|
|
0x10, 0x11, 0x12, 0x13, 0x14, 0x15, 0x16, 0x17,
|
|
0x18, 0x19, 0x1A, 0x1B, 0x1C, 0x1D, 0x1E, 0x1F,
|
|
0x1F, 0x1E, 0x1D, 0x1C, 0x1B, 0x1A, 0x19, 0x18,
|
|
0x17, 0x16, 0x15, 0x14, 0x13, 0x12, 0x11, 0x10,
|
|
0x0F, 0x0E, 0x0D, 0x0C, 0x0B, 0x0A, 0x09, 0x08,
|
|
0x07, 0x06, 0x05, 0x04, 0x03, 0x02, 0x01, 0x00
|
|
};
|
|
sbyte[] envstep_triangle = {
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, 1,
|
|
1, 1, 1, 1, 1, 1, 1, -31
|
|
};
|
|
|
|
byte[][] envelope_table;
|
|
sbyte[][] envstep_table;
|
|
|
|
ENVELOPE envelope;
|
|
NOISE noise = new NOISE();
|
|
CHANNEL[] op = new CHANNEL[3] { new CHANNEL(), new CHANNEL(), new CHANNEL() };
|
|
byte address;
|
|
int[] vol_table = new int[0x20];
|
|
int cycle_rate;
|
|
|
|
float cpu_clock;
|
|
|
|
public APU_FME7()
|
|
{
|
|
envelope_table = new byte[16][]
|
|
{
|
|
envelope_pulse0, envelope_pulse0, envelope_pulse0, envelope_pulse0,
|
|
envelope_pulse1, envelope_pulse1, envelope_pulse1, envelope_pulse1,
|
|
envelope_sawtooth0, envelope_pulse0, envelope_triangle0, envelope_pulse2,
|
|
envelope_sawtooth1, envelope_pulse3, envelope_triangle1, envelope_pulse1
|
|
};
|
|
|
|
envstep_table = new sbyte[16][]
|
|
{
|
|
envstep_pulse, envstep_pulse, envstep_pulse, envstep_pulse,
|
|
envstep_pulse, envstep_pulse, envstep_pulse, envstep_pulse,
|
|
envstep_sawtooth, envstep_pulse, envstep_triangle, envstep_pulse,
|
|
envstep_sawtooth, envstep_pulse, envstep_triangle, envstep_pulse
|
|
};
|
|
envelope = new ENVELOPE(envelope_table, envstep_table);
|
|
|
|
Reset(APU_CLOCK, 22050);
|
|
}
|
|
|
|
public override void Reset(float fClock, int nRate)
|
|
{
|
|
int i;
|
|
|
|
envelope.ZeroMemory();
|
|
noise.ZeroMemory();
|
|
|
|
foreach (var item in op)
|
|
{
|
|
item.ZeroMemory();
|
|
}
|
|
|
|
envelope.envtbl_index = 0;
|
|
envelope.envstep_index = 0;
|
|
|
|
noise.noiserange = 1;
|
|
noise.noiseout = 0xFF;
|
|
|
|
address = 0;
|
|
|
|
// Volume to voltage
|
|
double @out = 0x1FFF;
|
|
for (i = 31; i > 1; i--)
|
|
{
|
|
vol_table[i] = (int)(@out + 0.5);
|
|
@out /= 1.188502227; /* = 10 ^ (1.5/20) = 1.5dB */
|
|
}
|
|
vol_table[1] = 0;
|
|
vol_table[0] = 0;
|
|
|
|
Setup(fClock, nRate);
|
|
}
|
|
|
|
public override void Setup(float fClock, int nRate)
|
|
{
|
|
cpu_clock = fClock;
|
|
cycle_rate = (int)((fClock / 16.0f) * (1 << 16) / nRate);
|
|
}
|
|
|
|
public override void Write(ushort addr, byte data)
|
|
{
|
|
if (addr == 0xC000)
|
|
{
|
|
address = data;
|
|
}
|
|
else if (addr == 0xE000)
|
|
{
|
|
byte chaddr = address;
|
|
switch (chaddr)
|
|
{
|
|
case 0x00:
|
|
case 0x01:
|
|
case 0x02:
|
|
case 0x03:
|
|
case 0x04:
|
|
case 0x05:
|
|
{
|
|
CHANNEL ch = op[chaddr >> 1];
|
|
ch.reg[chaddr & 0x01] = data;
|
|
ch.freq = INT2FIX(((ch.reg[1] & 0x0F) << 8) + ch.reg[0] + 1);
|
|
}
|
|
break;
|
|
case 0x06:
|
|
noise.freq = INT2FIX((data & 0x1F) + 1);
|
|
break;
|
|
case 0x07:
|
|
{
|
|
for (byte i = 0; i < 3; i++)
|
|
{
|
|
op[i].enable = (byte)(data & (1 << i));
|
|
op[i].noise_on = (byte)(data & (8 << i));
|
|
}
|
|
}
|
|
break;
|
|
case 0x08:
|
|
case 0x09:
|
|
case 0x0A:
|
|
{
|
|
CHANNEL ch = op[chaddr & 3];
|
|
ch.reg[2] = data;
|
|
ch.env_on = (byte)(data & 0x10);
|
|
ch.volume = (byte)((data & 0x0F) * 2);
|
|
}
|
|
break;
|
|
case 0x0B:
|
|
case 0x0C:
|
|
envelope.reg[chaddr - 0x0B] = data;
|
|
envelope.freq = INT2FIX(((envelope.reg[1] & 0x0F) << 8) + envelope.reg[0] + 1);
|
|
break;
|
|
case 0x0D:
|
|
envelope.envtbl_index = (byte)(data & 0x0F);
|
|
envelope.envstep_index = (byte)(data & 0x0F);
|
|
envelope.envadr = 0;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
public override int Process(int channel)
|
|
{
|
|
if (channel < 3)
|
|
{
|
|
return ChannelRender(op[channel]);
|
|
}
|
|
else if (channel == 3)
|
|
{
|
|
// 必ずch3を1回呼んでからch0-2を呼ぶ事
|
|
EnvelopeRender();
|
|
NoiseRender();
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
public override int GetFreq(int channel)
|
|
{
|
|
if (channel < 3)
|
|
{
|
|
CHANNEL ch = op[channel];
|
|
|
|
if (ch.enable != 0 || ch.freq == 0)
|
|
return 0;
|
|
if (ch.env_on != 0)
|
|
{
|
|
if (envelope.volume == 0)
|
|
return 0;
|
|
}
|
|
else
|
|
{
|
|
if (ch.volume == 0)
|
|
return 0;
|
|
}
|
|
|
|
return (int)(256.0f * cpu_clock / (FIX2INT(ch.freq) * 16.0f));
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void EnvelopeRender()
|
|
{
|
|
if (envelope.freq == 0)
|
|
return;
|
|
envelope.phaseacc -= cycle_rate;
|
|
if (envelope.phaseacc >= 0)
|
|
return;
|
|
while (envelope.phaseacc < 0)
|
|
{
|
|
envelope.phaseacc += envelope.freq;
|
|
envelope.envadr += envelope.envstep[envelope.envadr];
|
|
}
|
|
envelope.volume = envelope.envtbl[envelope.envadr];
|
|
}
|
|
void NoiseRender()
|
|
{
|
|
if (noise.freq == 0)
|
|
return;
|
|
noise.phaseacc -= cycle_rate;
|
|
if (noise.phaseacc >= 0)
|
|
return;
|
|
while (noise.phaseacc < 0)
|
|
{
|
|
noise.phaseacc += noise.freq;
|
|
if (((noise.noiserange + 1) & 0x02) != 0)
|
|
noise.noiseout = (byte)(~noise.noiseout);
|
|
if ((noise.noiserange & 0x01) != 0)
|
|
noise.noiserange ^= 0x28000;
|
|
noise.noiserange >>= 1;
|
|
}
|
|
}
|
|
|
|
int ChannelRender(CHANNEL ch)
|
|
{
|
|
int output, volume;
|
|
|
|
if (ch.enable != 0)
|
|
return 0;
|
|
if (ch.freq == 0)
|
|
return 0;
|
|
|
|
ch.phaseacc -= cycle_rate;
|
|
while (ch.phaseacc < 0)
|
|
{
|
|
ch.phaseacc += ch.freq;
|
|
ch.adder++;
|
|
}
|
|
|
|
output = volume = 0;
|
|
volume = ch.env_on != 0 ? vol_table[envelope.volume] : vol_table[ch.volume + 1];
|
|
|
|
if ((ch.adder & 0x01) != 0)
|
|
{
|
|
output += volume;
|
|
}
|
|
else
|
|
{
|
|
output -= volume;
|
|
}
|
|
if (ch.noise_on == 0)
|
|
{
|
|
if (noise.noiseout != 0)
|
|
output += volume;
|
|
else
|
|
output -= volume;
|
|
}
|
|
|
|
ch.output_vol = output;
|
|
|
|
return ch.output_vol;
|
|
}
|
|
|
|
public override uint GetSize()
|
|
{
|
|
return (uint)(1 + envelope.GetSize() + noise.GetSize() + op[0].GetSize() * op.Length);
|
|
}
|
|
|
|
public override void SaveState(StateBuffer buffer)
|
|
{
|
|
buffer.Write(address);
|
|
|
|
envelope.SaveState(buffer);
|
|
noise.SaveState(buffer);
|
|
foreach (var oneOp in op)
|
|
oneOp.SaveState(buffer);
|
|
}
|
|
|
|
public class ENVELOPE : IStateBufferObject
|
|
{
|
|
public byte[] reg = new byte[3];
|
|
public byte volume;
|
|
|
|
public int freq;
|
|
public int phaseacc;
|
|
public int envadr;
|
|
|
|
public byte envtbl_index;
|
|
public byte envstep_index;
|
|
|
|
byte[][] ref_envtbl;
|
|
sbyte[][] ref_envstep;
|
|
public byte[] envtbl => ref_envtbl[envtbl_index];
|
|
public sbyte[] envstep => ref_envstep[envstep_index];
|
|
public ENVELOPE(byte[][] envtbl, sbyte[][] envstep)
|
|
{
|
|
ref_envtbl = envtbl;
|
|
ref_envstep = envstep;
|
|
}
|
|
|
|
|
|
public void ZeroMemory()
|
|
{
|
|
Array.Clear(reg, 0, 3);
|
|
volume = 0;
|
|
freq = 0;
|
|
phaseacc = 0;
|
|
envadr = 0;
|
|
envtbl_index = 0;
|
|
envstep_index = 0;
|
|
}
|
|
|
|
public uint GetSize()
|
|
{
|
|
return 18;
|
|
}
|
|
|
|
public void SaveState(StateBuffer buffer)
|
|
{
|
|
buffer.Write(reg);
|
|
buffer.Write(volume);
|
|
buffer.Write(freq);
|
|
buffer.Write(phaseacc);
|
|
buffer.Write(envadr);
|
|
buffer.Write(envtbl_index);
|
|
buffer.Write(envstep_index);
|
|
}
|
|
}
|
|
|
|
public class NOISE : IStateBufferObject
|
|
{
|
|
public int freq;
|
|
public int phaseacc;
|
|
public int noiserange;
|
|
public byte noiseout;
|
|
|
|
public void ZeroMemory()
|
|
{
|
|
freq = 0; phaseacc = 0; noiserange = 0; noiseout = 0;
|
|
}
|
|
|
|
public uint GetSize()
|
|
{
|
|
return 13;
|
|
}
|
|
|
|
public void SaveState(StateBuffer buffer)
|
|
{
|
|
buffer.Write(freq);
|
|
buffer.Write(phaseacc);
|
|
buffer.Write(noiserange);
|
|
buffer.Write(noiseout);
|
|
}
|
|
}
|
|
|
|
public class CHANNEL : IStateBufferObject
|
|
{
|
|
public byte[] reg = new byte[3];
|
|
public byte enable;
|
|
public byte env_on;
|
|
public byte noise_on;
|
|
public byte adder;
|
|
public byte volume;
|
|
|
|
public int freq;
|
|
public int phaseacc;
|
|
|
|
public int output_vol;
|
|
|
|
public void ZeroMemory()
|
|
{
|
|
Array.Clear(reg, 0, reg.Length);
|
|
enable = 0;
|
|
env_on = 0;
|
|
noise_on = 0;
|
|
adder = 0;
|
|
volume = 0; freq = 0;
|
|
phaseacc = 0;
|
|
output_vol = 0;
|
|
}
|
|
|
|
public uint GetSize()
|
|
{
|
|
return 20;
|
|
}
|
|
|
|
public void SaveState(StateBuffer buffer)
|
|
{
|
|
buffer.Write(reg);
|
|
buffer.Write(enable);
|
|
buffer.Write(env_on);
|
|
buffer.Write(noise_on);
|
|
buffer.Write(adder);
|
|
buffer.Write(volume);
|
|
buffer.Write(freq);
|
|
buffer.Write(phaseacc);
|
|
buffer.Write(output_vol);
|
|
}
|
|
}
|
|
}
|
|
}
|