furnace/src/engine/platform/ym2610.cpp

518 lines
15 KiB
C++
Raw Normal View History

2021-12-09 18:25:02 +00:00
#include "ym2610.h"
#include "../engine.h"
#include <string.h>
#include <math.h>
#include "ym2610shared.h"
2021-12-10 09:22:13 +00:00
#define FM_FREQ_BASE 622.0f
#define PSG_FREQ_BASE 7640.0f
2021-12-09 22:06:28 +00:00
2021-12-09 18:25:02 +00:00
static unsigned char konOffs[4]={
1, 2, 5, 6
};
void DivPlatformYM2610::acquire(short* bufL, short* bufR, size_t start, size_t len) {
static int os[2];
for (size_t h=start; h<start+len; h++) {
os[0]=0; os[1]=0;
if (!writes.empty()) {
2021-12-09 22:06:28 +00:00
if (--delay<1) {
QueuedWrite& w=writes.front();
fm->write(0x0+((w.addr>>8)<<1),w.addr);
2021-12-09 18:25:02 +00:00
fm->write(0x1+((w.addr>>8)<<1),w.val);
writes.pop();
2021-12-09 22:06:28 +00:00
delay=4;
2021-12-09 18:25:02 +00:00
}
}
fm->generate(&fmout);
2021-12-09 22:06:28 +00:00
os[0]=fmout.data[0]+(fmout.data[2]>>1);
2021-12-09 18:25:02 +00:00
if (os[0]<-32768) os[0]=-32768;
if (os[0]>32767) os[0]=32767;
2021-12-09 22:06:28 +00:00
os[1]=fmout.data[1]+(fmout.data[2]>>1);
2021-12-09 18:25:02 +00:00
if (os[1]<-32768) os[1]=-32768;
if (os[1]>32767) os[1]=32767;
bufL[h]=os[0];
bufR[h]=os[1];
}
}
void DivPlatformYM2610::tick() {
2021-12-09 22:06:28 +00:00
// PSG
for (int i=4; i<7; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=chan[i].std.vol-(15-chan[i].vol);
if (chan[i].outVol<0) chan[i].outVol=0;
rWrite(0x04+i,(chan[i].outVol&15)|((chan[i].psgMode&4)<<2));
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
} else {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
chan[i].freqChanged=true;
}
}
2021-12-10 09:22:13 +00:00
if (chan[i].std.hadDuty) {
rWrite(0x06,31-chan[i].std.duty);
}
2021-12-09 22:06:28 +00:00
if (chan[i].std.hadWave) {
chan[i].psgMode&=4;
chan[i].psgMode|=(chan[i].std.wave+1)&3;
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
DivInstrument* ins=parent->getIns(chan[i].ins);
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE-chan[i].pitch))/ONE_SEMITONE;
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].keyOn) {
//rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
//rWrite(16+i*5+2,((chan[i].vol<<4))|(ins->gb.envLen&7)|((ins->gb.envDir&1)<<3));
}
if (chan[i].keyOff) {
rWrite(0x04+i,0);
}
rWrite((i-4)<<1,chan[i].freq&0xff);
rWrite(1+((i-4)<<1),chan[i].freq>>8);
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
rWrite(0x07,
~((chan[4].psgMode&1)|
((chan[5].psgMode&1)<<1)|
((chan[6].psgMode&1)<<2)|
((chan[4].psgMode&2)<<2)|
((chan[5].psgMode&2)<<3)|
((chan[6].psgMode&2)<<4)));
2021-12-09 18:25:02 +00:00
// FM
for (int i=0; i<4; i++) {
if (i==1 && extMode) continue;
if (chan[i].keyOn || chan[i].keyOff) {
writes.emplace(0x28,0x00|konOffs[i]);
chan[i].keyOff=false;
}
}
for (int i=0; i<512; i++) {
if (pendingWrites[i]!=oldWrites[i]) {
writes.emplace(i,pendingWrites[i]&0xff);
oldWrites[i]=pendingWrites[i];
}
}
for (int i=0; i<4; i++) {
if (i==1 && extMode) continue;
if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE+chan[i].pitch))/ONE_SEMITONE;
int freqt=toFreq(chan[i].freq);
writes.emplace(chanOffs[i]+0xa4,freqt>>8);
writes.emplace(chanOffs[i]+0xa0,freqt&0xff);
2021-12-09 22:06:28 +00:00
chan[i].freqChanged=false;
2021-12-09 18:25:02 +00:00
}
if (chan[i].keyOn) {
writes.emplace(0x28,0xf0|konOffs[i]);
chan[i].keyOn=false;
}
}
}
int DivPlatformYM2610::octave(int freq) {
2021-12-10 09:22:13 +00:00
if (freq>=FM_FREQ_BASE*128) {
2021-12-09 18:25:02 +00:00
return 128;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*64) {
2021-12-09 18:25:02 +00:00
return 64;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*32) {
2021-12-09 18:25:02 +00:00
return 32;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*16) {
2021-12-09 18:25:02 +00:00
return 16;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*8) {
2021-12-09 18:25:02 +00:00
return 8;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*4) {
2021-12-09 18:25:02 +00:00
return 4;
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*2) {
2021-12-09 18:25:02 +00:00
return 2;
} else {
return 1;
}
return 1;
}
int DivPlatformYM2610::toFreq(int freq) {
2021-12-10 09:22:13 +00:00
if (freq>=FM_FREQ_BASE*128) {
2021-12-09 18:25:02 +00:00
return 0x3800|((freq>>7)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*64) {
2021-12-09 18:25:02 +00:00
return 0x3000|((freq>>6)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*32) {
2021-12-09 18:25:02 +00:00
return 0x2800|((freq>>5)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*16) {
2021-12-09 18:25:02 +00:00
return 0x2000|((freq>>4)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*8) {
2021-12-09 18:25:02 +00:00
return 0x1800|((freq>>3)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*4) {
2021-12-09 18:25:02 +00:00
return 0x1000|((freq>>2)&0x7ff);
2021-12-10 09:22:13 +00:00
} else if (freq>=FM_FREQ_BASE*2) {
2021-12-09 18:25:02 +00:00
return 0x800|((freq>>1)&0x7ff);
} else {
return freq&0x7ff;
}
}
int DivPlatformYM2610::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
2021-12-10 09:22:13 +00:00
if (c.chan>6) { // ADPCM
if ((12*sampleBank+c.value%12)>=parent->song.sampleLen) {
writes.emplace(0x100,0x80|(1<<(c.chan-7)));
writes.emplace(0x110+c.chan-7,0);
writes.emplace(0x118+c.chan-7,0);
writes.emplace(0x120+c.chan-7,0);
writes.emplace(0x128+c.chan-7,0);
break;
}
writes.emplace(0x110+c.chan-7,0);
writes.emplace(0x118+c.chan-7,c.value%12);
int sampleLen=(parent->song.sample[12*sampleBank+c.value%12]->rendLength+255)>>8;
writes.emplace(0x120+c.chan-7,sampleLen&0xff);
writes.emplace(0x128+c.chan-7,(c.value%12)+(sampleLen>>8));
writes.emplace(0x108+c.chan-7,0xff);
writes.emplace(0x100,0x00|(1<<(c.chan-7)));
break;
}
2021-12-09 18:25:02 +00:00
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
2021-12-09 22:06:28 +00:00
if (c.chan>3) { // PSG
chan[c.chan].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].std.init(ins);
rWrite(0x04+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
break;
}
2021-12-09 18:25:02 +00:00
for (int i=0; i<4; i++) {
unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
DivInstrumentFM::Operator op=ins->fm.op[i];
if (isOutput[ins->fm.alg][i]) {
if (!chan[c.chan].active || chan[c.chan].insChanged) {
rWrite(baseAddr+0x40,127-(((127-op.tl)*(chan[c.chan].vol&0x7f))/127));
}
} else {
if (chan[c.chan].insChanged) {
rWrite(baseAddr+0x40,op.tl);
}
}
if (chan[c.chan].insChanged) {
rWrite(baseAddr+0x30,(op.mult&15)|(dtTable[op.dt&7]<<4));
rWrite(baseAddr+0x50,(op.ar&31)|(op.rs<<6));
rWrite(baseAddr+0x60,(op.dr&31)|(op.am<<7));
rWrite(baseAddr+0x70,op.d2r&31);
rWrite(baseAddr+0x80,(op.rr&15)|(op.sl<<4));
rWrite(baseAddr+0x90,op.ssgEnv&15);
}
}
if (chan[c.chan].insChanged) {
rWrite(chanOffs[c.chan]+0xb0,(ins->fm.alg&7)|(ins->fm.fb<<3));
rWrite(chanOffs[c.chan]+0xb4,(chan[c.chan].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
}
chan[c.chan].insChanged=false;
2021-12-09 22:06:28 +00:00
chan[c.chan].baseFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value/12.0f));
2021-12-09 18:25:02 +00:00
chan[c.chan].freqChanged=true;
chan[c.chan].keyOn=true;
chan[c.chan].active=true;
break;
}
case DIV_CMD_NOTE_OFF:
2021-12-09 22:06:28 +00:00
if (c.chan>6) {
2021-12-09 18:25:02 +00:00
dacSample=-1;
}
chan[c.chan].keyOff=true;
chan[c.chan].active=false;
2021-12-09 22:06:28 +00:00
chan[c.chan].std.init(NULL);
2021-12-09 18:25:02 +00:00
break;
case DIV_CMD_VOLUME: {
chan[c.chan].vol=c.value;
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
2021-12-10 09:22:13 +00:00
if (c.chan>3) {
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
rWrite(0x04+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
break;
}
2021-12-09 18:25:02 +00:00
for (int i=0; i<4; i++) {
unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
DivInstrumentFM::Operator op=ins->fm.op[i];
if (isOutput[ins->fm.alg][i]) {
rWrite(baseAddr+0x40,127-(((127-op.tl)*(chan[c.chan].vol&0x7f))/127));
} else {
rWrite(baseAddr+0x40,op.tl);
}
}
break;
}
case DIV_CMD_GET_VOLUME: {
return chan[c.chan].vol;
break;
}
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value) {
chan[c.chan].insChanged=true;
}
chan[c.chan].ins=c.value;
break;
case DIV_CMD_PANNING: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) break;
2021-12-09 18:25:02 +00:00
switch (c.value) {
case 0x01:
chan[c.chan].pan=1;
break;
case 0x10:
chan[c.chan].pan=2;
break;
default:
chan[c.chan].pan=3;
break;
}
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
rWrite(chanOffs[c.chan]+0xb4,(chan[c.chan].pan<<6)|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
break;
}
case DIV_CMD_PITCH: {
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_NOTE_PORTA: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) { // PSG
int destFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value;
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq-=c.value;
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
int destFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value2/12.0f));
2021-12-09 18:25:02 +00:00
int newFreq;
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
newFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
if (newFreq>=destFreq) {
newFreq=destFreq;
return2=true;
}
} else {
newFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
if (newFreq<=destFreq) {
newFreq=destFreq;
return2=true;
}
}
if (!chan[c.chan].portaPause) {
if (octave(chan[c.chan].baseFreq)!=octave(newFreq)) {
chan[c.chan].portaPause=true;
break;
}
}
chan[c.chan].baseFreq=newFreq;
chan[c.chan].portaPause=false;
chan[c.chan].freqChanged=true;
if (return2) return 2;
break;
}
case DIV_CMD_SAMPLE_BANK:
sampleBank=c.value;
if (sampleBank>(parent->song.sample.size()/12)) {
sampleBank=parent->song.sample.size()/12;
}
2021-12-10 09:22:13 +00:00
iface.sampleBank=sampleBank;
2021-12-09 18:25:02 +00:00
break;
case DIV_CMD_LEGATO: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) { // PSG
chan[c.chan].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
} else {
chan[c.chan].baseFreq=FM_FREQ_BASE*pow(2.0f,((float)c.value/12.0f));
}
2021-12-09 18:25:02 +00:00
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_FM_LFO: {
rWrite(0x22,(c.value&7)|((c.value>>4)<<3));
break;
}
case DIV_CMD_FM_MULT: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) break;
2021-12-09 18:25:02 +00:00
unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
rWrite(baseAddr+0x30,(c.value2&15)|(dtTable[op.dt&7]<<4));
break;
}
case DIV_CMD_FM_TL: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) break;
2021-12-09 18:25:02 +00:00
unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
if (isOutput[ins->fm.alg][c.value]) {
rWrite(baseAddr+0x40,127-(((127-c.value2)*(chan[c.chan].vol&0x7f))/127));
} else {
rWrite(baseAddr+0x40,c.value2);
}
break;
}
case DIV_CMD_FM_AR: {
2021-12-09 22:06:28 +00:00
if (c.chan>3) break;
2021-12-09 18:25:02 +00:00
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
if (c.value<0) {
for (int i=0; i<4; i++) {
DivInstrumentFM::Operator op=ins->fm.op[i];
unsigned short baseAddr=chanOffs[c.chan]|opOffs[i];
rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
}
} else {
DivInstrumentFM::Operator op=ins->fm.op[orderedOps[c.value]];
unsigned short baseAddr=chanOffs[c.chan]|opOffs[orderedOps[c.value]];
rWrite(baseAddr+0x50,(c.value2&31)|(op.rs<<6));
}
break;
}
2021-12-10 09:22:13 +00:00
case DIV_CMD_STD_NOISE_FREQ:
if (c.chan<4 || c.chan>6) break;
rWrite(0x06,31-c.value);
break;
2021-12-09 22:06:28 +00:00
case DIV_CMD_AY_ENVELOPE_SET:
if (c.chan<4 || c.chan>6) break;
rWrite(0x0d,c.value>>4);
if (c.value&15) {
chan[c.chan].psgMode|=4;
} else {
chan[c.chan].psgMode&=~4;
}
2021-12-10 09:22:13 +00:00
rWrite(0x04+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
2021-12-09 22:06:28 +00:00
break;
case DIV_CMD_AY_ENVELOPE_LOW:
if (c.chan<4 || c.chan>6) break;
2021-12-10 09:22:13 +00:00
ayEnvPeriod&=0xff00;
ayEnvPeriod|=c.value;
writes.emplace(0x0b,ayEnvPeriod);
writes.emplace(0x0c,ayEnvPeriod>>8);
2021-12-09 22:06:28 +00:00
break;
case DIV_CMD_AY_ENVELOPE_HIGH:
if (c.chan<4 || c.chan>6) break;
2021-12-10 09:22:13 +00:00
ayEnvPeriod&=0xff;
ayEnvPeriod|=c.value<<8;
writes.emplace(0x0b,ayEnvPeriod);
writes.emplace(0x0c,ayEnvPeriod>>8);
2021-12-09 22:06:28 +00:00
break;
2021-12-09 18:25:02 +00:00
case DIV_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
if (c.chan>6) return 31;
if (c.chan>3) return 15;
return 127;
break;
case DIV_CMD_PRE_PORTA:
2021-12-09 22:06:28 +00:00
if (c.chan>3) {
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].inPorta=c.value;
}
2021-12-09 18:25:02 +00:00
break;
case DIV_CMD_PRE_NOTE:
break;
default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
break;
}
return 1;
}
bool DivPlatformYM2610::isStereo() {
return true;
}
bool DivPlatformYM2610::keyOffAffectsArp(int ch) {
return (ch>3);
}
int DivPlatformYM2610::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
if (pal) {
rate=500000;
} else {
rate=500000;
}
2021-12-10 09:22:13 +00:00
iface.parent=parent;
iface.sampleBank=0;
2021-12-09 18:25:02 +00:00
fm=new ymfm::ym2610(iface);
fm->reset();
2021-12-09 22:06:28 +00:00
for (int i=0; i<4; i++) {
2021-12-09 18:25:02 +00:00
chan[i].vol=0x7f;
}
2021-12-09 22:06:28 +00:00
for (int i=4; i<7; i++) {
chan[i].vol=0x0f;
}
for (int i=7; i<13; i++) {
chan[i].vol=0x1f;
}
2021-12-09 18:25:02 +00:00
for (int i=0; i<512; i++) {
oldWrites[i]=-1;
pendingWrites[i]=-1;
}
lastBusy=60;
dacMode=0;
dacPeriod=0;
dacPos=0;
dacRate=0;
dacSample=-1;
sampleBank=0;
2021-12-10 09:22:13 +00:00
ayEnvPeriod=0;
2021-12-09 18:25:02 +00:00
2021-12-09 22:06:28 +00:00
delay=0;
2021-12-09 18:25:02 +00:00
extMode=false;
// LFO
writes.emplace(0x22,0x08);
2021-12-10 09:22:13 +00:00
// PCM volume
writes.emplace(0x101,0x3f);
2021-12-09 18:25:02 +00:00
return 10;
}