furnace/src/engine/platform/genesis.cpp

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#include "genesis.h"
#include "../engine.h"
#include <string.h>
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#include <math.h>
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#include "genesisshared.h"
void DivPlatformGenesis::acquire(int& l, int& r) {
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static short o[2];
if (dacMode && dacSample!=-1) {
if (--dacPeriod<1) {
DivSample* s=parent->song.sample[dacSample];
if (s->depth==8) {
writes.emplace(0x2a,(unsigned char)s->rendData[dacPos++]+0x80);
} else {
writes.emplace(0x2a,((unsigned short)s->rendData[dacPos++]+0x8000)>>8);
}
if (dacPos>=s->rendLength) {
dacSample=-1;
}
dacPeriod=dacRate;
}
}
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if (!writes.empty() && --delay<0) {
delay=0;
QueuedWrite& w=writes.front();
if (w.addrOrVal) {
OPN2_Write(&fm,0x1+((w.addr>>8)<<1),w.val);
//printf("write: %x = %.2x\n",w.addr,w.val);
lastBusy=0;
writes.pop();
} else {
lastBusy++;
if (fm.write_busy==0) {
//printf("busycounter: %d\n",lastBusy);
OPN2_Write(&fm,0x0+((w.addr>>8)<<1),w.addr);
w.addrOrVal=true;
}
}
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}
OPN2_Clock(&fm,o);
//OPN2_Write(&fm,0,0);
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psgClocks+=223722;
if (psgClocks>=rate) {
psg.acquire(psgOut,psgOut);
psgClocks-=rate;
psgOut=(psgOut>>2)+(psgOut>>3);
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}
l=(o[0]<<7)+psgOut;
r=(o[1]<<7)+psgOut;
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}
void DivPlatformGenesis::tick() {
for (int i=0; i<6; i++) {
if (i==2 && extMode) continue;
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if (chan[i].keyOn || chan[i].keyOff) {
writes.emplace(0x28,0x00|konOffs[i]);
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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<6; i++) {
if (i==2 && extMode) continue;
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if (chan[i].freqChanged) {
chan[i].freq=(chan[i].baseFreq*(ONE_SEMITONE+chan[i].pitch))/ONE_SEMITONE;
if (chan[i].freq>=82432) {
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chan[i].freqH=((chan[i].freq>>15)&7)|0x38;
chan[i].freqL=(chan[i].freq>>7)&0xff;
} else if (chan[i].freq>=41216) {
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chan[i].freqH=((chan[i].freq>>14)&7)|0x30;
chan[i].freqL=(chan[i].freq>>6)&0xff;
} else if (chan[i].freq>=20608) {
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chan[i].freqH=((chan[i].freq>>13)&7)|0x28;
chan[i].freqL=(chan[i].freq>>5)&0xff;
} else if (chan[i].freq>=10304) {
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chan[i].freqH=((chan[i].freq>>12)&7)|0x20;
chan[i].freqL=(chan[i].freq>>4)&0xff;
} else if (chan[i].freq>=5152) {
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chan[i].freqH=((chan[i].freq>>11)&7)|0x18;
chan[i].freqL=(chan[i].freq>>3)&0xff;
} else if (chan[i].freq>=2576) {
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chan[i].freqH=((chan[i].freq>>10)&7)|0x10;
chan[i].freqL=(chan[i].freq>>2)&0xff;
} else if (chan[i].freq>=1288) {
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chan[i].freqH=((chan[i].freq>>9)&7)|0x08;
chan[i].freqL=(chan[i].freq>>1)&0xff;
} else {
chan[i].freqH=(chan[i].freq>>8)&7;
chan[i].freqL=chan[i].freq&0xff;
}
writes.emplace(chanOffs[i]+0xa4,chan[i].freqH);
writes.emplace(chanOffs[i]+0xa0,chan[i].freqL);
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}
if (chan[i].keyOn) {
writes.emplace(0x28,0xf0|konOffs[i]);
chan[i].keyOn=false;
}
}
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psg.tick();
}
int DivPlatformGenesis::octave(int freq) {
if (freq>=82432) {
return 128;
} else if (freq>=41216) {
return 64;
} else if (freq>=20608) {
return 32;
} else if (freq>=10304) {
return 16;
} else if (freq>=5152) {
return 8;
} else if (freq>=2576) {
return 4;
} else if (freq>=1288) {
return 2;
} else {
return 1;
}
return 1;
}
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int DivPlatformGenesis::dispatch(DivCommand c) {
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if (c.chan>5) {
c.chan-=6;
return psg.dispatch(c);
}
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switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
if (c.chan==5 && dacMode) {
dacSample=c.value%12;
if (dacSample>=parent->song.sampleLen) {
dacSample=-1;
break;
}
dacPos=0;
dacPeriod=0;
dacRate=dacRates[parent->song.sample[dacSample]->rate];
break;
}
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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]) {
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if (!chan[c.chan].active || chan[c.chan].insChanged) {
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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);
}
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}
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;
chan[c.chan].baseFreq=644.0f*pow(2.0f,((float)c.value/12.0f));
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chan[c.chan].freqChanged=true;
chan[c.chan].keyOn=true;
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chan[c.chan].active=true;
break;
}
case DIV_CMD_NOTE_OFF:
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chan[c.chan].keyOff=true;
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chan[c.chan].active=false;
break;
case DIV_CMD_VOLUME: {
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chan[c.chan].vol=c.value;
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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);
}
}
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break;
}
case DIV_CMD_GET_VOLUME: {
return chan[c.chan].vol;
break;
}
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case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value) {
chan[c.chan].insChanged=true;
}
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chan[c.chan].ins=c.value;
break;
case DIV_CMD_PANNING: {
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: {
int destFreq=644.0f*pow(2.0f,((float)c.value2/12.0f));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq=chan[c.chan].baseFreq+c.value*octave(chan[c.chan].baseFreq);
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq=chan[c.chan].baseFreq-c.value*octave(chan[c.chan].baseFreq);
if (chan[c.chan].baseFreq<=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
}
chan[c.chan].freqChanged=true;
if (return2) return 2;
break;
}
case DIV_CMD_SAMPLE_MODE: {
if (c.chan==5) {
dacMode=c.value;
rWrite(0x2b,c.value<<7);
}
break;
}
case DIV_CMD_LEGATO: {
chan[c.chan].baseFreq=644.0f*pow(2.0f,((float)c.value/12.0f));
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_FM_MULT: {
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: {
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: {
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;
}
case DIV_CMD_GET_VOLMAX:
return 127;
break;
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case DIV_CMD_PRE_PORTA:
break;
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default:
printf("WARNING: unimplemented command %d\n",c.cmd);
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break;
}
return 1;
}
int DivPlatformGenesis::init(DivEngine* p, int channels, int sugRate) {
parent=p;
rate=1278409;
OPN2_Reset(&fm);
for (int i=0; i<10; i++) {
chan[i].vol=0x7f;
}
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;
extMode=false;
// LFO
writes.emplace(0x22,0x08);
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delay=0;
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// PSG
psg.init(p,4,sugRate);
psgClocks=0;
psgOut=0;
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return 10;
}