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furnace/src/engine/platform/c64.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 "c64.h"
#include "../engine.h"
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {sid.write(a,v); regPool[(a)&0x1f]=v; if (dumpWrites) {addWrite(a,v);} }
#define CHIP_FREQBASE 524288
const char* regCheatSheetSID[]={
"FreqL0", "00",
"FreqH0", "01",
"PWL0", "02",
"PWH0", "03",
"Control0", "04",
"AtkDcy0", "05",
"StnRis0", "06",
"FreqL1", "07",
"FreqH1", "08",
"PWL1", "09",
"PWH1", "0A",
"Control1", "0B",
"AtkDcy1", "0C",
"StnRis1", "0D",
"FreqL2", "0E",
"FreqH2", "0F",
"PWL2", "10",
"PWH2", "11",
"Control2", "12",
"AtkDcy2", "13",
"StnRis2", "14",
"FCL", "15",
"FCH", "16",
"FilterRes", "17",
"FilterMode", "18",
"PotX", "19",
"PotY", "1A",
"Osc3", "1B",
"Env3", "1C",
NULL
};
const char** DivPlatformC64::getRegisterSheet() {
return regCheatSheetSID;
}
void DivPlatformC64::acquire(short* bufL, short* bufR, size_t start, size_t len) {
int dcOff=sid.get_dc(0);
for (size_t i=start; i<start+len; i++) {
sid.clock();
bufL[i]=sid.output();
if (++writeOscBuf>=8) {
writeOscBuf=0;
oscBuf[0]->data[oscBuf[0]->needle++]=(sid.last_chan_out[0]-dcOff)>>5;
oscBuf[1]->data[oscBuf[1]->needle++]=(sid.last_chan_out[1]-dcOff)>>5;
oscBuf[2]->data[oscBuf[2]->needle++]=(sid.last_chan_out[2]-dcOff)>>5;
}
}
}
void DivPlatformC64::updateFilter() {
rWrite(0x15,filtCut&7);
rWrite(0x16,filtCut>>3);
rWrite(0x17,(filtRes<<4)|(chan[2].filter<<2)|(chan[1].filter<<1)|(int)(chan[0].filter));
rWrite(0x18,(filtControl<<4)|vol);
}
void DivPlatformC64::tick(bool sysTick) {
for (int i=0; i<3; i++) {
chan[i].std.next();
if (chan[i].std.vol.had) {
DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_C64);
if (ins->c64.volIsCutoff) {
if (ins->c64.filterIsAbs) {
filtCut=MIN(2047,chan[i].std.vol.val);
} else {
filtCut-=((signed char)chan[i].std.vol.val)*7;
if (filtCut>2047) filtCut=2047;
if (filtCut<0) filtCut=0;
}
updateFilter();
} else {
vol=MIN(15,chan[i].std.vol.val);
updateFilter();
}
}
if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
chan[i].baseFreq=NOTE_FREQUENCY(parent->calcArp(chan[i].note,chan[i].std.arp.val));
}
chan[i].freqChanged=true;
}
if (chan[i].std.duty.had) {
DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_C64);
if (ins->c64.dutyIsAbs) {
chan[i].duty=chan[i].std.duty.val;
} else {
chan[i].duty-=((signed char)chan[i].std.duty.val)*4;
}
rWrite(i*7+2,chan[i].duty&0xff);
rWrite(i*7+3,chan[i].duty>>8);
}
if (sysTick) {
if (chan[i].testWhen>0) {
if (--chan[i].testWhen<1) {
if (!chan[i].resetMask && !chan[i].inPorta) {
DivInstrument* ins=parent->getIns(chan[i].ins,DIV_INS_C64);
rWrite(i*7+5,0);
rWrite(i*7+6,0);
rWrite(i*7+4,(chan[i].wave<<4)|(ins->c64.noTest?0:8)|(chan[i].test<<3)|(chan[i].ring<<2)|(chan[i].sync<<1));
}
}
}
}
if (chan[i].std.wave.had) {
chan[i].wave=chan[i].std.wave.val;
rWrite(i*7+4,(chan[i].wave<<4)|(chan[i].test<<3)|(chan[i].ring<<2)|(chan[i].sync<<1)|(int)(chan[i].active));
}
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.ex1.had) {
filtControl=chan[i].std.ex1.val&15;
updateFilter();
}
if (chan[i].std.ex2.had) {
filtRes=chan[i].std.ex2.val&15;
updateFilter();
}
if (chan[i].std.ex3.had) {
chan[i].sync=chan[i].std.ex3.val&1;
chan[i].ring=chan[i].std.ex3.val&2;
chan[i].freqChanged=true;
rWrite(i*7+4,(chan[i].wave<<4)|(chan[i].test<<3)|(chan[i].ring<<2)|(chan[i].sync<<1)|(int)(chan[i].active));
}
if (chan[i].std.ex4.had) {
chan[i].test=chan[i].std.ex4.val&1;
rWrite(i*7+4,(chan[i].wave<<4)|(chan[i].test<<3)|(chan[i].ring<<2)|(chan[i].sync<<1)|(int)(chan[i].active));
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,false,8,chan[i].pitch2,chipClock,CHIP_FREQBASE);
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,(chan[i].wave<<4)|(chan[i].test<<3)|(chan[i].ring<<2)|(chan[i].sync<<1)|1);
}
if (chan[i].keyOff) {
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,(chan[i].wave<<4)|(chan[i].test<<3)|(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,DIV_INS_C64);
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=NOTE_FREQUENCY(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].test=false;
if (chan[c.chan].insChanged || chan[c.chan].resetDuty || ins->std.waveMacro.len>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)|(int)(ins->c64.triOn);
chan[c.chan].attack=ins->c64.a;
chan[c.chan].decay=(ins->c64.s==15)?0: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=(int)(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].macroInit(ins);
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].keyOn=false;
//chan[c.chan].macroInit(NULL);
break;
case DIV_CMD_NOTE_OFF_ENV:
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].keyOn=false;
chan[c.chan].std.release();
break;
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].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.vol.has) {
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=NOTE_FREQUENCY(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:
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].test<<3)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|(int)(chan[c.chan].active));
break;
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=NOTE_FREQUENCY(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].inPorta) {
chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_C64));
chan[c.chan].keyOn=true;
}
}
if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will) chan[c.chan].baseFreq=NOTE_FREQUENCY(chan[c.chan].note);
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,DIV_INS_C64);
if (ins->c64.initFilter) {
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,DIV_INS_C64);
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].test<<3)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|(int)(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].test<<3)|(chan[c.chan].ring<<2)|(chan[c.chan].sync<<1)|(int)(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;
sid.set_is_muted(ch,mute);
}
void DivPlatformC64::forceIns() {
for (int i=0; i<3; i++) {
chan[i].insChanged=true;
chan[i].testWhen=0;
if (chan[i].active) {
chan[i].keyOn=true;
chan[i].freqChanged=true;
}
}
updateFilter();
}
void DivPlatformC64::notifyInsChange(int ins) {
for (int i=0; i<3; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
void DivPlatformC64::notifyInsDeletion(void* ins) {
for (int i=0; i<3; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void* DivPlatformC64::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformC64::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformC64::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformC64::getRegisterPool() {
return regPool;
}
int DivPlatformC64::getRegisterPoolSize() {
return 32;
}
bool DivPlatformC64::getDCOffRequired() {
return true;
}
bool DivPlatformC64::getWantPreNote() {
return true;
}
void DivPlatformC64::reset() {
for (int i=0; i<3; i++) {
chan[i]=DivPlatformC64::Channel();
chan[i].std.setEngine(parent);
}
sid.reset();
memset(regPool,0,32);
rWrite(0x18,0x0f);
filtControl=7;
filtRes=0;
filtCut=2047;
resetTime=1;
vol=15;
}
void DivPlatformC64::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformC64::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
void DivPlatformC64::setChipModel(bool is6581) {
if (is6581) {
sid.set_chip_model(MOS6581);
} else {
sid.set_chip_model(MOS8580);
}
}
void DivPlatformC64::setFlags(unsigned int flags) {
switch (flags&0xf) {
case 0x0: // NTSC C64
rate=COLOR_NTSC*2.0/7.0;
break;
case 0x1: // PAL C64
rate=COLOR_PAL*2.0/9.0;
break;
case 0x2: // SSI 2001
default:
rate=14318180.0/16.0;
break;
}
chipClock=rate;
for (int i=0; i<3; i++) {
oscBuf[i]->rate=rate/16;
}
}
int DivPlatformC64::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 DivPlatformC64::quit() {
for (int i=0; i<3; i++) {
delete oscBuf[i];
}
}
DivPlatformC64::~DivPlatformC64() {
}
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