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furnace/src/engine/platform/lynx.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 "lynx.h"
#include "../engine.h"
#include "../bsr.h"
#include <math.h>
#define rWrite(a,v) {if (!skipRegisterWrites) {mikey->write(a,v); if (dumpWrites) {addWrite(a,v);}}}
#define WRITE_VOLUME(ch,v) rWrite(0x20+(ch<<3),(v))
#define WRITE_FEEDBACK(ch,v) rWrite(0x21+(ch<<3),(v))
#define WRITE_OUTPUT(ch,v) rWrite(0x22+(ch<<3),(v))
#define WRITE_LFSR(ch,v) rWrite(0x23+(ch<<3),(v))
#define WRITE_BACKUP(ch,v) rWrite(0x24+(ch<<3),(v))
#define WRITE_CONTROL(ch,v) rWrite(0x25+(ch<<3),(v))
#define WRITE_OTHER(ch,v) rWrite(0x27+(ch<<3),(v))
#define WRITE_ATTEN(ch,v) rWrite((0x40+ch),(v))
#define WRITE_STEREO(v) rWrite(0x50,(v))
#define CHIP_DIVIDER 64
#define CHIP_FREQBASE 16000000
static int32_t clamp(int32_t v, int32_t lo, int32_t hi)
{
return v<lo?lo:(v>hi?hi:v);
}
const char* regCheatSheetLynx[]={
"AUDIO0_VOLCNTRL", "20",
"AUDIO0_FEEDBACK", "21",
"AUDIO0_OUTPUT", "22",
"AUDIO0_SHIFT", "23",
"AUDIO0_BACKUP", "24",
"AUDIO0_CONTROL", "25",
"AUDIO0_COUNTER", "26",
"AUDIO0_OTHER", "27",
"AUDIO1_VOLCNTRL", "28",
"AUDIO1_FEEDBACK", "29",
"AUDIO1_OUTPUT", "2a",
"AUDIO1_SHIFT", "2b",
"AUDIO1_BACKUP", "2c",
"AUDIO1_CONTROL", "2d",
"AUDIO1_COUNTER", "2e",
"AUDIO1_OTHER", "2f",
"AUDIO2_VOLCNTRL", "30",
"AUDIO2_FEEDBACK", "31",
"AUDIO2_OUTPUT", "32",
"AUDIO2_SHIFT", "33",
"AUDIO2_BACKUP", "34",
"AUDIO2_CONTROL", "35",
"AUDIO2_COUNTER", "36",
"AUDIO2_OTHER", "37",
"AUDIO3_VOLCNTRL", "38",
"AUDIO3_FEEDBACK", "39",
"AUDIO3_OUTPUT", "3a",
"AUDIO3_SHIFT", "3b",
"AUDIO3_BACKUP", "3c",
"AUDIO3_CONTROL", "3d",
"AUDIO3_COUNTER", "3e",
"AUDIO3_OTHER", "3f",
"ATTENREG0", "40",
"ATTENREG1", "41",
"ATTENREG2", "42",
"ATTENREG3", "43",
"MPAN", "44",
"MSTEREO", "50",
NULL
};
const char** DivPlatformLynx::getRegisterSheet() {
return regCheatSheetLynx;
}
void DivPlatformLynx::acquire(short** buf, size_t len) {
for (size_t h=0; h<len; h++) {
for (int i=0; i<4; i++) {
if (chan[i].pcm && chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
chan[i].sampleAccum-=chan[i].sampleFreq;
if (chan[i].sampleAccum<0) {
chan[i].sampleAccum+=rate;
DivSample* s=parent->getSample(chan[i].sample);
if (s!=NULL) {
if (isMuted[i]) {
WRITE_OUTPUT(i,0);
} else {
WRITE_OUTPUT(i,CLAMP((s->data8[chan[i].samplePos]*chan[i].outVol)>>7,-128,127));
}
chan[i].samplePos++;
if (s->isLoopable() && chan[i].samplePos>=s->loopEnd) {
chan[i].samplePos=s->loopStart;
} else if (chan[i].samplePos>=(int)s->samples) {
chan[i].sample=-1;
}
}
}
}
}
mikey->sampleAudio(buf[0]+h,buf[1]+h,1,oscBuf);
}
}
void DivPlatformLynx::tick(bool sysTick) {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.vol.had) {
if (chan[i].pcm) {
chan[i].outVol=((chan[i].vol&127)*MIN(chan[i].macroVolMul,chan[i].std.vol.val))/chan[i].macroVolMul;
} else {
chan[i].outVol=((chan[i].vol&127)*MIN(127,chan[i].std.vol.val))>>7;
}
WRITE_VOLUME(i,(isMuted[i]?0:(chan[i].outVol&127)));
}
if (NEW_ARP_STRAT) {
chan[i].handleArp();
} else if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
chan[i].actualNote=parent->calcArp(chan[i].note,chan[i].std.arp.val);
chan[i].baseFreq=NOTE_PERIODIC(chan[i].actualNote);
if (chan[i].pcm) chan[i].sampleBaseFreq=NOTE_FREQUENCY(chan[i].actualNote);
chan[i].freqChanged=true;
}
}
if (chan[i].std.panL.had) {
chan[i].pan&=0x0f;
chan[i].pan|=(chan[i].std.panL.val&15)<<4;
}
if (chan[i].std.panR.had) {
chan[i].pan&=0xf0;
chan[i].pan|=chan[i].std.panR.val&15;
}
if (chan[i].std.panL.had || chan[i].std.panR.had) {
WRITE_ATTEN(i,chan[i].pan);
}
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==1) {
if (chan[i].pcm && chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
chan[i].sampleAccum=0;
chan[i].samplePos=0;
}
WRITE_LFSR(i, 0);
WRITE_OTHER(i, 0);
}
}
if (chan[i].freqChanged) {
if (chan[i].pcm) {
double off=1.0;
if (chan[i].sample>=0 && chan[i].sample<parent->song.sampleLen) {
DivSample* s=parent->getSample(chan[i].sample);
if (s->centerRate<1) {
off=1.0;
} else {
off=(double)s->centerRate/8363.0;
}
}
chan[i].sampleFreq=off*parent->calcFreq(chan[i].sampleBaseFreq,chan[i].pitch,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,false,2,chan[i].pitch2,chipClock,CHIP_FREQBASE);
} else {
if (chan[i].lfsr >= 0) {
WRITE_LFSR(i, (chan[i].lfsr&0xff));
WRITE_OTHER(i, ((chan[i].lfsr&0xf00)>>4));
chan[i].lfsr=-1;
}
chan[i].fd=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,CHIP_DIVIDER);
if (chan[i].std.duty.had) {
chan[i].duty=chan[i].std.duty.val;
if (!chan[i].pcm) {
WRITE_FEEDBACK(i, chan[i].duty.feedback);
}
}
WRITE_CONTROL(i, (chan[i].fd.clockDivider|0x18|chan[i].duty.int_feedback7));
WRITE_BACKUP( i, chan[i].fd.backup );
}
chan[i].freqChanged=false;
} else if (chan[i].std.duty.had) {
chan[i].duty = chan[i].std.duty.val;
if (!chan[i].pcm) {
WRITE_FEEDBACK(i, chan[i].duty.feedback);
WRITE_CONTROL(i, (chan[i].fd.clockDivider|0x18|chan[i].duty.int_feedback7));
}
}
}
}
int DivPlatformLynx::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
bool prevPCM=chan[c.chan].pcm;
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_MIKEY);
chan[c.chan].macroVolMul=ins->type==DIV_INS_AMIGA?64:127;
chan[c.chan].pcm=(ins->type==DIV_INS_AMIGA || ins->amiga.useSample);
if (chan[c.chan].pcm!=prevPCM) {
if (chan[c.chan].pcm) {
WRITE_FEEDBACK(c.chan,0);
WRITE_CONTROL(c.chan,0x18);
WRITE_BACKUP(c.chan,0);
} else {
WRITE_FEEDBACK(c.chan,chan[c.chan].duty.feedback);
WRITE_CONTROL(c.chan,(chan[c.chan].fd.clockDivider|0x18|chan[c.chan].duty.int_feedback7));
WRITE_BACKUP(c.chan,chan[c.chan].fd.backup);
}
}
if (c.value!=DIV_NOTE_NULL) {
if (chan[c.chan].pcm) {
chan[c.chan].sample=ins->amiga.getSample(c.value);
c.value=ins->amiga.getFreq(c.value);
chan[c.chan].sampleBaseFreq=NOTE_FREQUENCY(c.value);
chan[c.chan].sampleAccum=0;
chan[c.chan].samplePos=0;
}
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].actualNote=c.value;
if (chan[c.chan].lfsr<0)
chan[c.chan].lfsr=0;
}
chan[c.chan].active=true;
WRITE_VOLUME(c.chan,(isMuted[c.chan]?0:(chan[c.chan].vol&127)));
chan[c.chan].macroInit(ins);
if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
chan[c.chan].outVol=chan[c.chan].vol;
}
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].active=false;
WRITE_VOLUME(c.chan,0);
WRITE_CONTROL(c.chan,0);
chan[c.chan].macroInit(NULL);
if (chan[c.chan].pcm) {
chan[c.chan].pcm=false;
}
break;
case DIV_CMD_LYNX_LFSR_LOAD:
chan[c.chan].freqChanged=true;
chan[c.chan].lfsr=c.value;
break;
case DIV_CMD_NOTE_OFF_ENV:
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
break;
case DIV_CMD_INSTRUMENT:
chan[c.chan].ins=c.value;
//chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_MIKEY));
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 (chan[c.chan].active && !chan[c.chan].pcm) WRITE_VOLUME(c.chan,(isMuted[c.chan]?0:(chan[c.chan].vol&127)));
}
break;
case DIV_CMD_PANNING:
chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
WRITE_ATTEN(c.chan,chan[c.chan].pan);
break;
case DIV_CMD_GET_VOLUME:
if (chan[c.chan].std.vol.has) {
return chan[c.chan].vol;
}
return chan[c.chan].outVol;
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 (chan[c.chan].pcm && parent->song.linearPitch==2) {
chan[c.chan].sampleBaseFreq=chan[c.chan].baseFreq;
}
if (return2) {
chan[c.chan].inPorta=false;
return 2;
}
break;
}
case DIV_CMD_LEGATO: {
int whatAMess=c.value+((HACKY_LEGATO_MESS)?(chan[c.chan].std.arp.val):(0));
chan[c.chan].baseFreq=NOTE_PERIODIC(whatAMess);
if (chan[c.chan].pcm) {
chan[c.chan].sampleBaseFreq=NOTE_FREQUENCY(whatAMess);
}
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].actualNote=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_MIKEY));
}
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:
return 127;
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 0;
break;
default:
break;
}
return 1;
}
void DivPlatformLynx::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (chan[ch].active) WRITE_VOLUME(ch,(isMuted[ch]?0:(chan[ch].outVol&127)));
}
int DivPlatformLynx::getOutputCount() {
return 2;
}
void DivPlatformLynx::forceIns() {
for (int i=0; i<4; i++) {
if (chan[i].active) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
WRITE_ATTEN(i,chan[i].pan);
}
}
void* DivPlatformLynx::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformLynx::getChanMacroInt(int ch) {
return &chan[ch].std;
}
unsigned short DivPlatformLynx::getPan(int ch) {
return ((chan[ch].pan&0xf0)<<4)|(chan[ch].pan&15);
}
DivSamplePos DivPlatformLynx::getSamplePos(int ch) {
if (ch>=4) return DivSamplePos();
if (!chan[ch].pcm) return DivSamplePos();
return DivSamplePos(
chan[ch].sample,
chan[ch].samplePos,
chan[ch].sampleFreq
);
}
DivDispatchOscBuffer* DivPlatformLynx::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformLynx::getRegisterPool()
{
return const_cast<unsigned char*>( mikey->getRegisterPool() );
}
int DivPlatformLynx::getRegisterPoolSize()
{
return 4*8+4;
}
void DivPlatformLynx::reset() {
mikey=std::make_unique<Lynx::Mikey>(rate);
for (int i=0; i<4; i++) {
chan[i]=DivPlatformLynx::Channel();
chan[i].std.setEngine(parent);
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
WRITE_STEREO(0);
}
bool DivPlatformLynx::keyOffAffectsArp(int ch) {
return true;
}
bool DivPlatformLynx::keyOffAffectsPorta(int ch) {
return true;
}
//int DivPlatformLynx::getPortaFloor(int ch) {
// return 12;
//}
void DivPlatformLynx::notifyInsDeletion(void* ins) {
for (int i=0; i<4; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformLynx::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformLynx::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr, i.val);
}
int DivPlatformLynx::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<4; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
chipClock = 16000000;
CHECK_CUSTOM_CLOCK;
rate = chipClock/128;
for (int i=0; i<4; i++) {
oscBuf[i]->rate=rate;
}
reset();
return 4;
}
void DivPlatformLynx::quit() {
for (int i=0; i<4; i++) {
delete oscBuf[i];
}
mikey.reset();
}
DivPlatformLynx::~DivPlatformLynx() {
}
DivPlatformLynx::MikeyFreqDiv::MikeyFreqDiv(int frequency) {
int clamped=clamp(frequency, 36, 16383);
auto top=bsr(clamped);
if (top>7)
{
clockDivider=top-7;
backup=clamped>>(top-7);
}
else
{
clockDivider=0;
backup=clamped;
}
}
DivPlatformLynx::MikeyDuty::MikeyDuty(int duty) {
//duty:
//9: int
//8: f11
//7: f10
//6: f7
//5: f5
//4: f4
//3: f3
//2: f2
//1: f1
//0: f0
//f7 moved to bit 7 and int moved to bit 5
int_feedback7=((duty&0x40)<<1)|((duty&0x200)>>4);
//f11 and f10 moved to bits 7 & 6
feedback=(duty&0x3f)|((duty&0x180)>>1);
}
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