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"
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static unsigned char konOffs[6]={
0, 1, 2, 4, 5, 6
};
void DivPlatformGenesis::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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static short o[2];
static int os[2];
for (size_t h=start; h<start+len; h++) {
if (dacMode && dacSample!=-1) {
dacPeriod-=6;
if (dacPeriod<1) {
DivSample* s=parent->song.sample[dacSample];
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if (!isMuted[5]) {
if (s->depth==8) {
immWrite(0x2a,(unsigned char)s->rendData[dacPos++]+0x80);
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} else {
immWrite(0x2a,((unsigned short)s->rendData[dacPos++]+0x8000)>>8);
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}
}
if (dacPos>=s->rendLength) {
dacSample=-1;
}
dacPeriod+=dacRate;
}
}
os[0]=0; os[1]=0;
for (int i=0; i<6; i++) {
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); os[0]+=o[0]; os[1]+=o[1];
//OPN2_Write(&fm,0,0);
}
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psgClocks+=psg.rate;
while (psgClocks>=rate) {
psgOut=(psg.acquireOne()*3)>>3;
psgClocks-=rate;
}
os[0]=(os[0]<<5)+psgOut;
if (os[0]<-32768) os[0]=-32768;
if (os[0]>32767) os[0]=32767;
os[1]=(os[1]<<5)+psgOut;
if (os[1]<-32768) os[1]=-32768;
if (os[1]>32767) os[1]=32767;
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bufL[h]=os[0];
bufR[h]=os[1];
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}
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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) {
immWrite(0x28,0x00|konOffs[i]);
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chan[i].keyOff=false;
}
}
for (int i=0; i<512; i++) {
if (pendingWrites[i]!=oldWrites[i]) {
immWrite(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=parent->calcFreq(chan[i].baseFreq,chan[i].pitch);
int freqt=toFreq(chan[i].freq);
immWrite(chanOffs[i]+0xa4,freqt>>8);
immWrite(chanOffs[i]+0xa0,freqt&0xff);
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chan[i].freqChanged=false;
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}
if (chan[i].keyOn) {
immWrite(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;
}
int DivPlatformGenesis::toFreq(int freq) {
if (freq>=82432) {
return 0x3800|((freq>>7)&0x7ff);
} else if (freq>=41216) {
return 0x3000|((freq>>6)&0x7ff);
} else if (freq>=20608) {
return 0x2800|((freq>>5)&0x7ff);
} else if (freq>=10304) {
return 0x2000|((freq>>4)&0x7ff);
} else if (freq>=5152) {
return 0x1800|((freq>>3)&0x7ff);
} else if (freq>=2576) {
return 0x1000|((freq>>2)&0x7ff);
} else if (freq>=1288) {
return 0x800|((freq>>1)&0x7ff);
} else {
return freq&0x7ff;
}
}
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void DivPlatformGenesis::muteChannel(int ch, bool mute) {
if (ch>5) {
psg.muteChannel(ch-6,mute);
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return;
}
isMuted[ch]=mute;
DivInstrument* ins=parent->getIns(chan[ch].ins);
rWrite(chanOffs[ch]+0xb4,(isMuted[ch]?0:(chan[ch].pan<<6))|(ins->fm.fms&7)|((ins->fm.ams&3)<<4));
}
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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) {
if (skipRegisterWrites) break;
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dacSample=12*sampleBank+c.value%12;
if (dacSample>=parent->song.sampleLen) {
dacSample=-1;
break;
}
dacPos=0;
dacPeriod=0;
dacRate=1280000/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));
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rWrite(chanOffs[c.chan]+0xb4,(isMuted[c.chan]?0:(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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if (c.chan==5) {
dacSample=-1;
}
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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 || c.value2==1) {
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);
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rWrite(chanOffs[c.chan]+0xb4,(isMuted[c.chan]?0:(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));
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_MODE: {
if (c.chan==5) {
dacMode=c.value;
rWrite(0x2b,c.value<<7);
}
break;
}
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case DIV_CMD_SAMPLE_BANK:
sampleBank=c.value;
if (sampleBank>(parent->song.sample.size()/12)) {
sampleBank=parent->song.sample.size()/12;
}
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;
}
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case DIV_CMD_FM_LFO: {
rWrite(0x22,(c.value&7)|((c.value>>4)<<3));
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_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 127;
break;
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case DIV_CMD_PRE_PORTA:
break;
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case DIV_CMD_PRE_NOTE:
break;
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default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
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break;
}
return 1;
}
void DivPlatformGenesis::forceIns() {
for (int i=0; i<10; i++) {
chan[i].insChanged=true;
}
if (dacMode) {
rWrite(0x2b,0x80);
}
}
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void DivPlatformGenesis::reset() {
while (!writes.empty()) writes.pop();
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OPN2_Reset(&fm);
for (int i=0; i<10; i++) {
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chan[i]=DivPlatformGenesis::Channel();
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;
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sampleBank=0;
extMode=false;
// LFO
immWrite(0x22,0x08);
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delay=0;
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// PSG
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psg.reset();
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psgClocks=0;
psgOut=0;
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}
bool DivPlatformGenesis::isStereo() {
return true;
}
bool DivPlatformGenesis::keyOffAffectsArp(int ch) {
return (ch>5);
}
bool DivPlatformGenesis::keyOffAffectsPorta(int ch) {
return (ch>5);
}
void DivPlatformGenesis::notifyInsDeletion(void* ins) {
psg.notifyInsDeletion(ins);
}
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void DivPlatformGenesis::setPAL(bool pal) {
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if (pal) {
rate=211125;
} else {
rate=213068;
}
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}
int DivPlatformGenesis::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
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for (int i=0; i<10; i++) {
isMuted[i]=false;
}
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setPAL(pal);
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// PSG
psg.init(p,4,sugRate,pal);
reset();
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return 10;
}
void DivPlatformGenesis::quit() {
psg.quit();
}
DivPlatformGenesis::~DivPlatformGenesis() {
}