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furnace/src/engine/platform/vrc6.cpp

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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2023 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
#include "vrc6.h"
#include "../engine.h"
#include <cstddef>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {writes.push(QueuedWrite(a,v)); if (dumpWrites) {addWrite(a,v);} }
#define chWrite(c,a,v) rWrite(0x9000+(c<<12)+(a&3),v)
const char* regCheatSheetVRC6[]={
"S0DutyVol", "9000",
"S0PeriodL", "9001",
"S0PeriodH", "9002",
"GlobalCtl", "9003",
"S1DutyVol", "A000",
"S1PeriodL", "A001",
"S1PeriodH", "A002",
"SawVolume", "B000",
"SawPeriodL", "B001",
"SawPeriodH", "B002",
"TimerLatch", "F000",
"TimerCtl", "F001",
"IRQAck", "F002",
NULL
};
const char** DivPlatformVRC6::getRegisterSheet() {
return regCheatSheetVRC6;
}
void DivPlatformVRC6::acquire(short** buf, size_t len) {
for (size_t i=0; i<len; i++) {
// PCM part
for (int i=0; i<2; i++) {
if (chan[i].pcm && chan[i].dacSample!=-1) {
chan[i].dacPeriod+=chan[i].dacRate;
if (chan[i].dacPeriod>rate) {
DivSample* s=parent->getSample(chan[i].dacSample);
if (s->samples<=0) {
chan[i].dacSample=-1;
chWrite(i,0,0);
continue;
}
unsigned char dacData=(((unsigned char)s->data8[chan[i].dacPos]^0x80)>>4);
chan[i].dacOut=MAX(0,MIN(15,(dacData*chan[i].outVol)>>4));
if (!isMuted[i]) {
chWrite(i,0,0x80|chan[i].dacOut);
}
chan[i].dacPos++;
if (s->isLoopable() && chan[i].dacPos>=(unsigned int)s->loopEnd) {
chan[i].dacPos=s->loopStart;
} else if (chan[i].dacPos>=s->samples) {
chan[i].dacSample=-1;
chWrite(i,0,0);
}
chan[i].dacPeriod-=rate;
}
}
}
// VRC6 part
vrc6.tick();
int sample=vrc6.out()<<9; // scale to 16 bit
if (sample>32767) sample=32767;
if (sample<-32768) sample=-32768;
buf[0][i]=sample;
// Oscilloscope buffer part
if (++writeOscBuf>=32) {
writeOscBuf=0;
for (int i=0; i<2; i++) {
oscBuf[i]->data[oscBuf[i]->needle++]=vrc6.pulse_out(i)<<11;
}
oscBuf[2]->data[oscBuf[2]->needle++]=vrc6.sawtooth_out()<<10;
}
// Command part
while (!writes.empty()) {
QueuedWrite w=writes.front();
switch (w.addr&0xf000) {
case 0x9000: // Pulse 1
if (w.addr<=0x9003) {
if (w.addr==0x9003) {
vrc6.control_w(w.val);
} else if (w.addr<=0x9002) {
vrc6.pulse_w(0,w.addr&3,w.val);
}
regPool[w.addr-0x9000]=w.val;
}
break;
case 0xa000: // Pulse 2
if (w.addr<=0xa002) {
vrc6.pulse_w(1,w.addr&3,w.val);
regPool[(w.addr-0xa000)+4]=w.val;
}
break;
case 0xb000: // Sawtooth
if (w.addr<=0xb002) {
vrc6.saw_w(w.addr&3,w.val);
regPool[(w.addr-0xb000)+7]=w.val;
}
break;
case 0xf000: // IRQ/Timer
if (w.addr<=0xf002) {
vrc6.timer_w(w.addr&3,w.val);
regPool[(w.addr-0xf000)+10]=w.val;
}
break;
}
writes.pop();
}
}
}
void DivPlatformVRC6::tick(bool sysTick) {
for (int i=0; i<3; i++) {
// 16 for pulse; 14 for saw
int CHIP_DIVIDER=(i==2)?14:16;
chan[i].std.next();
if (chan[i].std.vol.had) {
if (i==2) { // sawtooth
chan[i].outVol=((chan[i].vol&63)*MIN(63,chan[i].std.vol.val))/63;
if (chan[i].outVol<0) chan[i].outVol=0;
if (chan[i].outVol>63) chan[i].outVol=63;
if (!isMuted[i]) {
chWrite(i,0,chan[i].outVol);
}
} else { // pulse
chan[i].outVol=((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))/15;
if (chan[i].outVol<0) chan[i].outVol=0;
if (chan[i].outVol>15) chan[i].outVol=15;
if ((!isMuted[i]) && (!chan[i].pcm)) {
chWrite(i,0,(chan[i].outVol&0xf)|((chan[i].duty&7)<<4));
}
}
}
if (NEW_ARP_STRAT) {
chan[i].handleArp();
} else if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
chan[i].baseFreq=NOTE_PERIODIC(parent->calcArp(chan[i].note,chan[i].std.arp.val));
}
chan[i].freqChanged=true;
}
if (chan[i].std.duty.had) {
chan[i].duty=chan[i].std.duty.val;
if ((!isMuted[i]) && (i!=2) && (!chan[i].pcm)) { // pulse
chWrite(i,0,(chan[i].outVol&0xf)|((chan[i].duty&7)<<4));
}
}
if (chan[i].std.pitch.had) {
if (chan[i].std.pitch.mode) {
chan[i].pitch2+=chan[i].std.pitch.val;
CLAMP_VAR(chan[i].pitch2,-32768,32767);
} else {
chan[i].pitch2=chan[i].std.pitch.val;
}
chan[i].freqChanged=true;
}
if (chan[i].std.phaseReset.had) {
if (chan[i].std.phaseReset.val && chan[i].active) {
if ((i!=2) && (!chan[i].pcm)) {
if (dumpWrites) addWrite(0xffff0002+(i<<8),0);
if (chan[i].dacSample<0 || chan[i].dacSample>=parent->song.sampleLen) {
if (dumpWrites) {
chWrite(i,2,0x80);
chWrite(i,0,isMuted[i]?0:0x80);
addWrite(0xffff0000+(i<<8),chan[i].dacSample);
}
chan[i].dacPos=0;
chan[i].dacPeriod=0;
chan[i].keyOn=true;
}
}
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
if (i==2) { // sawtooth
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,true,0,chan[i].pitch2,chipClock,14)-1;
} else { // pulse
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,true,0,chan[i].pitch2,chipClock,16)-1;
if (chan[i].furnaceDac) {
double off=1.0;
if (chan[i].dacSample>=0 && chan[i].dacSample<parent->song.sampleLen) {
DivSample* s=parent->getSample(chan[i].dacSample);
if (s->centerRate<1) {
off=1.0;
} else {
off=8363.0/(double)s->centerRate;
}
}
chan[i].dacRate=((double)chipClock)/MAX(1,off*chan[i].freq);
if (dumpWrites) addWrite(0xffff0001+(i<<8),chan[i].dacRate);
}
}
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].freq<0) chan[i].freq=0;
if (chan[i].keyOff) {
chWrite(i,2,0);
} else if (chan[i].active) {
chWrite(i,1,chan[i].freq&0xff);
chWrite(i,2,0x80|((chan[i].freq>>8)&0xf));
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
}
int DivPlatformVRC6::dispatch(DivCommand c) {
int CHIP_DIVIDER=(c.chan==2)?14:16;
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (c.chan!=2) { // pulse wave
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_VRC6);
if (ins->type==DIV_INS_AMIGA || ins->amiga.useSample) {
chan[c.chan].pcm=true;
} else if (chan[c.chan].furnaceDac) {
chan[c.chan].pcm=false;
}
if (chan[c.chan].pcm) {
if (skipRegisterWrites) break;
if (ins->type==DIV_INS_AMIGA || ins->amiga.useSample) {
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].dacSample=ins->amiga.getSample(c.value);
c.value=ins->amiga.getFreq(c.value);
}
if (chan[c.chan].dacSample<0 || chan[c.chan].dacSample>=parent->song.sampleLen) {
chan[c.chan].dacSample=-1;
if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
break;
} else {
if (dumpWrites) {
chWrite(c.chan,2,0x80);
chWrite(c.chan,0,isMuted[c.chan]?0:0x80);
addWrite(0xffff0000+(c.chan<<8),chan[c.chan].dacSample);
}
}
chan[c.chan].dacPos=0;
chan[c.chan].dacPeriod=0;
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
chan[c.chan].active=true;
chan[c.chan].macroInit(ins);
if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
chan[c.chan].outVol=chan[c.chan].vol;
}
//chan[c.chan].keyOn=true;
chan[c.chan].furnaceDac=true;
} else {
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].note=c.value;
}
chan[c.chan].dacSample=12*sampleBank+chan[c.chan].note%12;
if (chan[c.chan].dacSample>=parent->song.sampleLen) {
chan[c.chan].dacSample=-1;
if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
break;
} else {
if (dumpWrites) addWrite(0xffff0000+(c.chan<<8),chan[c.chan].dacSample);
}
chan[c.chan].dacPos=0;
chan[c.chan].dacPeriod=0;
chan[c.chan].dacRate=parent->getSample(chan[c.chan].dacSample)->rate;
if (dumpWrites) {
chWrite(c.chan,2,0x80);
chWrite(c.chan,0,isMuted[c.chan]?0:0x80);
addWrite(0xffff0001+(c.chan<<8),chan[c.chan].dacRate);
}
chan[c.chan].furnaceDac=false;
}
break;
}
}
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_VRC6));
if (!isMuted[c.chan]) {
if (c.chan==2) { // sawtooth
chWrite(c.chan,0,chan[c.chan].vol);
} else if (!chan[c.chan].pcm) {
chWrite(c.chan,0,(chan[c.chan].vol&0xf)|((chan[c.chan].duty&7)<<4));
}
}
break;
case DIV_CMD_NOTE_OFF:
chan[c.chan].dacSample=-1;
if (dumpWrites) addWrite(0xffff0002+(c.chan<<8),0);
chan[c.chan].pcm=false;
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].macroInit(NULL);
break;
case DIV_CMD_NOTE_OFF_ENV:
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
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.vol.has) {
chan[c.chan].outVol=c.value;
}
if (!isMuted[c.chan]) {
if (chan[c.chan].active) {
if (c.chan==2) { // sawtooth
chWrite(c.chan,0,chan[c.chan].vol);
} else if (!chan[c.chan].pcm) {
chWrite(c.chan,0,(chan[c.chan].vol&0xf)|((chan[c.chan].duty&7)<<4));
}
}
}
}
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=NOTE_PERIODIC(c.value2);
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:
if ((c.chan!=2) && (!chan[c.chan].pcm)) { // pulse
chan[c.chan].duty=c.value;
}
break;
case DIV_CMD_SAMPLE_MODE:
if (c.chan!=2) { // pulse
chan[c.chan].pcm=c.value;
}
break;
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=NOTE_PERIODIC(c.value+((HACKY_LEGATO_MESS)?(chan[c.chan].std.arp.val):(0)));
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
break;
case DIV_CMD_PRE_PORTA:
if (chan[c.chan].active && c.value2) {
if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_VRC6));
}
if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=NOTE_PERIODIC(chan[c.chan].note);
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_GET_VOLMAX:
if (c.chan==2) return 63; // sawtooth has 6 bit volume
return 15; // pulse has 4 bit volume
break;
case DIV_CMD_MACRO_OFF:
chan[c.chan].std.mask(c.value,true);
break;
case DIV_CMD_MACRO_ON:
chan[c.chan].std.mask(c.value,false);
break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
void DivPlatformVRC6::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (isMuted[ch]) {
chWrite(ch,0,0);
} else if (chan[ch].active) {
if (ch==2) { // sawtooth
chWrite(ch,0,chan[ch].outVol);
} else {
chWrite(ch,0,chan[ch].pcm?chan[ch].dacOut:((chan[ch].outVol&0xf)|((chan[ch].duty&7)<<4)));
}
}
}
void DivPlatformVRC6::forceIns() {
for (int i=0; i<3; i++) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
}
void* DivPlatformVRC6::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformVRC6::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivSamplePos DivPlatformVRC6::getSamplePos(int ch) {
if (ch>=2) return DivSamplePos();
if (!chan[ch].pcm) return DivSamplePos();
return DivSamplePos(
chan[ch].dacSample,
chan[ch].dacPos,
chan[ch].dacRate
);
}
DivDispatchOscBuffer* DivPlatformVRC6::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformVRC6::getRegisterPool() {
return regPool;
}
int DivPlatformVRC6::getRegisterPoolSize() {
return 13;
}
void DivPlatformVRC6::reset() {
for (int i=0; i<3; i++) {
chan[i]=DivPlatformVRC6::Channel();
chan[i].std.setEngine(parent);
}
// HELP
chan[2].vol=63;
chan[2].outVol=63;
if (dumpWrites) {
addWrite(0xffffffff,0);
}
sampleBank=0;
vrc6.reset();
// Initialize control register
rWrite(0x9003,0);
// Clear internal IRQ
rWrite(0xf000,0);
rWrite(0xf001,0);
rWrite(0xf002,0);
}
bool DivPlatformVRC6::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformVRC6::setFlags(const DivConfig& flags) {
int clockSel=flags.getInt("clockSel",0);
if (clockSel==2) { // Dendy
chipClock=COLOR_PAL*2.0/5.0;
} else if (clockSel==1) { // PAL
chipClock=COLOR_PAL*3.0/8.0;
} else { // NTSC
chipClock=COLOR_NTSC/2.0;
}
CHECK_CUSTOM_CLOCK;
rate=chipClock;
for (int i=0; i<3; i++) {
oscBuf[i]->rate=rate/32;
}
}
void DivPlatformVRC6::notifyInsDeletion(void* ins) {
for (int i=0; i<3; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformVRC6::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformVRC6::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
int DivPlatformVRC6::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
writeOscBuf=0;
for (int i=0; i<3; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
setFlags(flags);
reset();
return 3;
}
void DivPlatformVRC6::quit() {
for (int i=0; i<3; i++) {
delete oscBuf[i];
}
}
DivPlatformVRC6::~DivPlatformVRC6() {
}
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