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