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furnace/src/engine/platform/c64.cpp
tildearrow ce027d99f6 force insChanged on note input 
partially solves issue #8
2022-01-17 18:01:40 -05:00

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#include "c64.h"
#include "../engine.h"
#include <math.h>
#define FREQ_BASE 277.0f
#define rWrite(a,v) if (!skipRegisterWrites) {sid.write(a,v); if (dumpWrites) {addWrite(a,v);} }
void DivPlatformC64::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+len; i++) {
sid.clock();
bufL[i]=sid.output();
}
}
void DivPlatformC64::updateFilter() {
rWrite(0x15,filtCut&7);
rWrite(0x16,filtCut>>3);
rWrite(0x17,(filtRes<<4)|(chan[2].filter<<2)|(chan[1].filter<<1)|(chan[0].filter));
rWrite(0x18,(filtControl<<4)|vol);
}
void DivPlatformC64::tick() {
for (int i=0; i<3; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
DivInstrument* ins=parent->getIns(chan[i].ins);
if (ins->c64.volIsCutoff) {
if (ins->c64.filterIsAbs) {
filtCut=chan[i].std.vol;
} else {
filtCut-=((signed char)chan[i].std.vol-18)*7;
if (filtCut>2047) filtCut=2047;
if (filtCut<0) filtCut=0;
}
updateFilter();
} else {
vol=chan[i].std.vol;
updateFilter();
}
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(FREQ_BASE*pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
} else {
chan[i].baseFreq=round(FREQ_BASE*pow(2.0f,((float)(chan[i].note+(signed char)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(FREQ_BASE*pow(2.0f,((float)(chan[i].note)/12.0f)));
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty) {
DivInstrument* ins=parent->getIns(chan[i].ins);
if (ins->c64.dutyIsAbs) {
chan[i].duty=chan[i].std.duty;
} else {
chan[i].duty-=((signed char)chan[i].std.duty-12)*4;
}
rWrite(i*7+2,chan[i].duty&0xff);
rWrite(i*7+3,chan[i].duty>>8);
}
if (chan[i].testWhen>0) {
if (--chan[i].testWhen<1) {
if (!chan[i].resetMask && !isMuted[i]) {
rWrite(i*7+5,0);
rWrite(i*7+6,0);
rWrite(i*7+4,(isMuted[i]?0:(chan[i].wave<<4))|8|(chan[i].ring<<2)|(chan[i].sync<<1));
}
}
}
if (chan[i].std.hadWave) {
chan[i].wave=chan[i].std.wave;
rWrite(i*7+4,(isMuted[i]?0:(chan[i].wave<<4))|(chan[i].ring<<2)|(chan[i].sync<<1)|chan[i].active);
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch);
if (chan[i].freq>0xffff) chan[i].freq=0xffff;
if (chan[i].keyOn) {
rWrite(i*7+5,(chan[i].attack<<4)|(chan[i].decay));
rWrite(i*7+6,(chan[i].sustain<<4)|(chan[i].release));
rWrite(i*7+4,(isMuted[i]?0:(chan[i].wave<<4))|(chan[i].ring<<2)|(chan[i].sync<<1)|1);
}
if (chan[i].keyOff && !isMuted[i]) {
rWrite(i*7+5,(chan[i].attack<<4)|(chan[i].decay));
rWrite(i*7+6,(chan[i].sustain<<4)|(chan[i].release));
rWrite(i*7+4,(isMuted[i]?0:(chan[i].wave<<4))|(chan[i].ring<<2)|(chan[i].sync<<1)|0);
}
rWrite(i*7,chan[i].freq&0xff);
rWrite(i*7+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;
}
}
}
int DivPlatformC64::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
chan[c.chan].baseFreq=round(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;
if (chan[c.chan].insChanged || chan[c.chan].resetDuty || ins->std.waveMacroLen>0) {
chan[c.chan].duty=ins->c64.duty;
rWrite(c.chan*7+2,chan[c.chan].duty&0xff);
rWrite(c.chan*7+3,chan[c.chan].duty>>8);
}
if (chan[c.chan].insChanged) {
chan[c.chan].wave=(ins->c64.noiseOn<<3)|(ins->c64.pulseOn<<2)|(ins->c64.sawOn<<1)|(ins->c64.triOn);
chan[c.chan].attack=ins->c64.a;
chan[c.chan].decay=ins->c64.d;
chan[c.chan].sustain=ins->c64.s;
chan[c.chan].release=ins->c64.r;
chan[c.chan].ring=ins->c64.ringMod;
chan[c.chan].sync=ins->c64.oscSync;
}
if (chan[c.chan].insChanged || chan[c.chan].resetFilter) {
chan[c.chan].filter=ins->c64.toFilter;
if (ins->c64.initFilter) {
filtCut=ins->c64.cut;
filtRes=ins->c64.res;
filtControl=ins->c64.lp|(ins->c64.bp<<1)|(ins->c64.hp<<2)|(ins->c64.ch3off<<3);
updateFilter();
}
}
if (chan[c.chan].insChanged) {
chan[c.chan].insChanged=false;
}
chan[c.chan].std.init(ins);
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
//chan[c.chan].std.init(NULL);
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
chan[c.chan].insChanged=true;
chan[c.chan].ins=c.value;
}
break;
case DIV_CMD_VOLUME:
if (chan[c.chan].vol!=c.value) {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
vol=chan[c.chan].outVol;
} else {
vol=chan[c.chan].vol;
}
updateFilter();
}
break;
case DIV_CMD_GET_VOLUME:
return chan[c.chan].vol;
break;
case DIV_CMD_PITCH:
chan[c.chan].pitch=c.value;
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_NOTE_PORTA: {
int destFreq=round(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;
}
case DIV_CMD_STD_NOISE_MODE:
chan[c.chan].duty=(c.value*4095)/100;
rWrite(c.chan*7+2,chan[c.chan].duty&0xff);
rWrite(c.chan*7+3,chan[c.chan].duty>>8);
break;
case DIV_CMD_C64_FINE_DUTY:
chan[c.chan].duty=c.value;
rWrite(c.chan*7+2,chan[c.chan].duty&0xff);
rWrite(c.chan*7+3,chan[c.chan].duty>>8);
break;
case DIV_CMD_WAVE:
chan[c.chan].wave=c.value;
rWrite(c.chan*7+4,(chan[c.chan].wave<<4)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|chan[c.chan].active);
break;
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=round(FREQ_BASE*pow(2.0f,((float)(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp-12):(0)))/12.0f)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
case DIV_CMD_PRE_PORTA:
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].keyOn=true;
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_PRE_NOTE:
if (resetTime) chan[c.chan].testWhen=c.value-resetTime+1;
break;
case DIV_CMD_GET_VOLMAX:
return 15;
break;
case DIV_CMD_C64_CUTOFF:
if (c.value>100) c.value=100;
filtCut=c.value*2047/100;
updateFilter();
break;
case DIV_CMD_C64_FINE_CUTOFF:
filtCut=c.value;
updateFilter();
break;
case DIV_CMD_C64_RESONANCE:
if (c.value>15) c.value=15;
filtRes=c.value;
updateFilter();
break;
case DIV_CMD_C64_FILTER_MODE:
filtControl=c.value&7;
updateFilter();
break;
case DIV_CMD_C64_RESET_TIME:
resetTime=c.value;
break;
case DIV_CMD_C64_RESET_MASK:
chan[c.chan].resetMask=c.value;
break;
case DIV_CMD_C64_FILTER_RESET:
if (c.value&15) {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
filtCut=ins->c64.cut;
updateFilter();
}
chan[c.chan].resetFilter=c.value>>4;
break;
case DIV_CMD_C64_DUTY_RESET:
if (c.value&15) {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
chan[c.chan].duty=ins->c64.duty;
rWrite(c.chan*7+2,chan[c.chan].duty&0xff);
rWrite(c.chan*7+3,chan[c.chan].duty>>8);
}
chan[c.chan].resetDuty=c.value>>4;
break;
case DIV_CMD_C64_EXTENDED:
switch (c.value>>4) {
case 0:
chan[c.chan].attack=c.value&15;
break;
case 1:
chan[c.chan].decay=c.value&15;
break;
case 2:
chan[c.chan].sustain=c.value&15;
break;
case 3:
chan[c.chan].release=c.value&15;
break;
case 4:
chan[c.chan].ring=c.value;
rWrite(c.chan*7+4,(chan[c.chan].wave<<4)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|chan[c.chan].active);
break;
case 5:
chan[c.chan].sync=c.value;
rWrite(c.chan*7+4,(chan[c.chan].wave<<4)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|chan[c.chan].active);
break;
case 6:
filtControl&=7;
filtControl|=(!!c.value)<<3;
break;
}
break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
void DivPlatformC64::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
rWrite(ch*7+4,(isMuted[ch]?0:(chan[ch].wave<<4))|(chan[ch].ring<<2)|(chan[ch].sync<<1)|chan[ch].active);
}
void DivPlatformC64::forceIns() {
for (int i=0; i<3; i++) {
chan[i].insChanged=true;
chan[i].testWhen=0;
}
updateFilter();
}
void DivPlatformC64::notifyInsDeletion(void* ins) {
for (int i=0; i<3; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformC64::reset() {
for (int i=0; i<3; i++) {
chan[i]=DivPlatformC64::Channel();
}
sid.reset();
rWrite(0x18,0x0f);
filtControl=0;
filtRes=0;
filtCut=0;
resetTime=1;
vol=15;
}
void DivPlatformC64::setChipModel(bool is6581) {
if (is6581) {
sid.set_chip_model(MOS6581);
} else {
sid.set_chip_model(MOS8580);
}
}
void DivPlatformC64::setPAL(bool pal) {
if (pal) {
rate=985248;
} else {
rate=1022727;
}
}
int DivPlatformC64::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<3; i++) {
isMuted[i]=false;
}
setPAL(pal);
reset();
return 3;
}
void DivPlatformC64::quit() {
}
DivPlatformC64::~DivPlatformC64() {
}
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