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furnace/src/engine/platform/vrc6.cpp
tildearrow c009cb3536 dev112 - prepare for advanced arp macro 
this new advanced arp macro offers more flexibility and reduces code duplication
it allows you to set each step of the macro to either relative or fixed mode
(instead of just one mode for the entire macro)

the UI is still a work in progress and doesn't work well

this change is big and may break things! further fixes incoming
2022-08-22 15:59:45 -05:00

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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2022 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.emplace(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* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+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>=s->getEndPosition()) {
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;
bufL[i]=bufR[i]=sample;
// Oscilloscope buffer part
if (++writeOscBuf>=32) {
writeOscBuf=0;
for (int i=0; i<3; i++) {
oscBuf[i]->data[oscBuf[i]->needle++]=vrc6.chan_out(i)<<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 (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].freqChanged || chan[i].keyOn || chan[i].keyOff) {
if (i==2) { // sawtooth
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,14)-1;
} else { // pulse
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,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 {
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) {
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) {
chan[c.chan].dacSample=ins->amiga.getSample(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+((chan[c.chan].std.arp.will && !chan[c.chan].std.arp.mode)?(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) 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_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;
}
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(unsigned int flags) {
if (flags==2) { // Dendy
rate=COLOR_PAL*2.0/5.0;
} else if (flags==1) { // PAL
rate=COLOR_PAL*3.0/8.0;
} else { // NTSC
rate=COLOR_NTSC/2.0;
}
chipClock=rate;
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, unsigned int 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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