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furnace/src/engine/platform/c64.cpp

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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;
}
const char* DivPlatformC64::getEffectName(unsigned char effect) {
switch (effect) {
case 0x10:
return "10xx: Set waveform (bit 0: triangle; bit 1: saw; bit 2: pulse; bit 3: noise)";
break;
case 0x11:
return "11xx: Set coarse cutoff (not recommended; use 4xxx instead)";
break;
case 0x12:
return "12xx: Set coarse pulse width (not recommended; use 3xxx instead)";
break;
case 0x13:
return "13xx: Set resonance (0 to F)";
break;
case 0x14:
return "14xx: Set filter mode (bit 0: low pass; bit 1: band pass; bit 2: high pass)";
break;
case 0x15:
return "15xx: Set envelope reset time";
break;
case 0x1a:
return "1Axx: Disable envelope reset for this channel (1 disables; 0 enables)";
break;
case 0x1b:
return "1Bxy: Reset cutoff (x: on new note; y: now)";
break;
case 0x1c:
return "1Cxy: Reset pulse width (x: on new note; y: now)";
break;
case 0x1e:
return "1Exy: Change additional parameters";
break;
case 0x30: case 0x31: case 0x32: case 0x33:
case 0x34: case 0x35: case 0x36: case 0x37:
case 0x38: case 0x39: case 0x3a: case 0x3b:
case 0x3c: case 0x3d: case 0x3e: case 0x3f:
return "3xxx: Set pulse width (0 to FFF)";
break;
case 0x40: case 0x41: case 0x42: case 0x43:
case 0x44: case 0x45: case 0x46: case 0x47:
return "4xxx: Set cutoff (0 to 7FF)";
break;
}
return NULL;
}
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) {
if (chan[i].std.arp.mode) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp.val);
} else {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+(signed char)chan[i].std.arp.val);
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
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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