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furnace/src/engine/platform/pokey.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 "pokey.h"
#include "../engine.h"
#include "../../ta-log.h"
#define rWrite(a,v) if (!skipRegisterWrites) {writes.push(QueuedWrite(a,v)); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 1
const char* regCheatSheetPOKEY[]={
"AUDF1", "0",
"AUDC1", "1",
"AUDF2", "2",
"AUDC2", "3",
"AUDF3", "4",
"AUDC3", "5",
"AUDF4", "6",
"AUDC4", "7",
"AUDCTL", "8",
"SKCTL", "F",
NULL
};
// LLsLSsLLsSLsLLn
const unsigned char snapPeriodLong[15]={
0, 1, 1, 3, 3, 6, 6, 7, 7, 10, 10, 12, 12, 13, 13
};
const unsigned char snapPeriodShort[15]={
2, 2, 2, 2, 5, 5, 5, 8, 8, 11, 11, 11, 11, 17, 17
};
// LsSLsLLnLLsLSsL
const unsigned char snapPeriodLong16[15]={
0, 0, 3, 3, 3, 5, 6, 6, 8, 9, 9, 11, 11, 14, 14
};
const unsigned char snapPeriodShort16[15]={
1, 1, 1, 4, 4, 4, 4, 4, 10, 10, 10, 10, 13, 13, 13
};
const unsigned char waveMap[8]={
0, 1, 2, 3, 4, 5, 6, 6
};
const char** DivPlatformPOKEY::getRegisterSheet() {
return regCheatSheetPOKEY;
}
void DivPlatformPOKEY::acquire(short** buf, size_t len) {
if (useAltASAP) {
acquireASAP(buf[0],len);
} else {
acquireMZ(buf[0],len);
}
}
void DivPlatformPOKEY::acquireMZ(short* buf, size_t len) {
for (size_t h=0; h<len; h++) {
while (!writes.empty()) {
QueuedWrite w=writes.front();
Update_pokey_sound_mz(&pokey,w.addr,w.val,0);
regPool[w.addr&0x0f]=w.val;
writes.pop();
}
mzpokeysnd_process_16(&pokey,&buf[h],1);
if (++oscBufDelay>=14) {
oscBufDelay=0;
oscBuf[0]->data[oscBuf[0]->needle++]=pokey.outvol_0<<10;
oscBuf[1]->data[oscBuf[1]->needle++]=pokey.outvol_1<<10;
oscBuf[2]->data[oscBuf[2]->needle++]=pokey.outvol_2<<10;
oscBuf[3]->data[oscBuf[3]->needle++]=pokey.outvol_3<<10;
}
}
}
void DivPlatformPOKEY::acquireASAP(short* buf, size_t len) {
while (!writes.empty()) {
QueuedWrite w=writes.front();
altASAP.write(w.addr, w.val);
writes.pop();
}
for (size_t h=0; h<len; h++) {
if (++oscBufDelay>=2) {
oscBufDelay=0;
buf[h]=altASAP.sampleAudio(oscBuf);
} else {
buf[h]=altASAP.sampleAudio();
}
}
}
void DivPlatformPOKEY::tick(bool sysTick) {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.vol.had) {
chan[i].outVol=VOL_SCALE_LINEAR(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
chan[i].ctlChanged=true;
}
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) {
audctl=chan[i].std.duty.val;
audctlChanged=true;
}
if (chan[i].std.wave.had) {
chan[i].wave=chan[i].std.wave.val;
chan[i].ctlChanged=true;
chan[i].freqChanged=true;
}
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 (audctlChanged) {
audctlChanged=false;
rWrite(8,audctl);
for (int i=0; i<4; i++) {
chan[i].freqChanged=true;
chan[i].ctlChanged=true;
}
}
if (skctlChanged) {
skctlChanged=false;
rWrite(15,skctl);
}
for (int i=0; i<4; i++) {
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,parent->song.linearPitch?chan[i].pitch:0,chan[i].fixedArp?chan[i].baseNoteOverride:chan[i].arpOff,chan[i].fixedArp,true,0,parent->song.linearPitch?chan[i].pitch2:0,chipClock,CHIP_DIVIDER);
if ((i==0 && !(audctl&64)) || (i==2 && !(audctl&32)) || i==1 || i==3) {
chan[i].freq/=7;
switch (chan[i].wave) {
case 6:
chan[i].freq/=5;
chan[i].freq>>=1;
break;
case 7:
if (audctl&1) {
chan[i].freq/=5;
} else {
chan[i].freq/=15;
}
chan[i].freq>>=1;
break;
default:
chan[i].freq>>=2;
break;
}
} else if ((i==0 && audctl&64) || (i==2 && audctl&32)) {
switch (chan[i].wave) {
case 6:
chan[i].freq<<=1;
chan[i].freq/=5;
break;
case 7:
chan[i].freq<<=1;
chan[i].freq/=15;
break;
}
}
if (audctl&1 && !((i==0 && audctl&64) || (i==2 && audctl&32))) {
chan[i].freq>>=2;
}
// non-linear pitch
if (parent->song.linearPitch==0) {
chan[i].freq-=chan[i].pitch;
}
if (--chan[i].freq<0) chan[i].freq=0;
// snap buzz periods
int minFreq8=255;
if (chan[i].wave==7) {
if ((i==0 && audctl&64) || (i==2 && audctl&32)) {
chan[i].freq=15*(chan[i].freq/15)+snapPeriodLong16[(chan[i].freq%15)]+1;
} else {
if (!(audctl&1)) chan[i].freq=15*(chan[i].freq/15)+snapPeriodLong[(chan[i].freq%15)];
}
} else if (chan[i].wave==6) {
if ((i==0 && audctl&64) || (i==2 && audctl&32)) {
chan[i].freq=15*(chan[i].freq/15)+snapPeriodShort16[(chan[i].freq%15)]+1;
} else {
if (!(audctl&1)) chan[i].freq=15*(chan[i].freq/15)+snapPeriodShort[(chan[i].freq%15)];
}
minFreq8=251;
}
if ((i==0 && audctl&16) || (i==2 && audctl&8)) {
if (chan[i].freq>65535) chan[i].freq=65535;
} else {
if (chan[i].freq>minFreq8) chan[i].freq=minFreq8;
}
// write frequency
if ((i==1 && audctl&16) || (i==3 && audctl&8)) {
// ignore - channel is paired
} else {
rWrite(i<<1,chan[i].freq&0xff);
if ((i==0 && audctl&16) || (i==2 && audctl&8)) {
rWrite((1+i)<<1,chan[i].freq>>8);
}
}
if (chan[i].keyOff) {
chan[i].ctlChanged=true;
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
if (chan[i].ctlChanged) {
unsigned char val=((chan[i].active && !isMuted[i])?(chan[i].outVol&15):0)|(waveMap[chan[i].wave&7]<<5);
chan[i].ctlChanged=false;
if ((i==1 && audctl&16) || (i==3 && audctl&8)) {
// ignore - channel is paired
} else if ((i==0 && audctl&16) || (i==2 && audctl&8)) {
rWrite(1+(i<<1),0);
rWrite(3+(i<<1),val);
} else {
rWrite(1+(i<<1),val);
}
}
}
}
int DivPlatformPOKEY::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_POKEY);
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(ins);
if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
chan[c.chan].outVol=chan[c.chan].vol;
chan[c.chan].ctlChanged=true;
}
chan[c.chan].insChanged=false;
break;
}
case DIV_CMD_NOTE_OFF:
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;
chan[c.chan].insChanged=true;
}
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].ctlChanged=true;
}
}
}
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_WAVE:
chan[c.chan].wave=c.value;
chan[c.chan].ctlChanged=true;
break;
case DIV_CMD_STD_NOISE_MODE:
audctl=c.value&0xff;
audctlChanged=true;
break;
case DIV_CMD_STD_NOISE_FREQ:
skctl=c.value?0x8b:0x03;
skctlChanged=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_LEGATO:
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
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_POKEY));
}
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 15;
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 DivPlatformPOKEY::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
chan[ch].ctlChanged=true;
}
void DivPlatformPOKEY::forceIns() {
for (int i=0; i<4; i++) {
chan[i].insChanged=true;
chan[i].ctlChanged=true;
chan[i].freqChanged=true;
}
audctlChanged=true;
skctlChanged=true;
}
void* DivPlatformPOKEY::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformPOKEY::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformPOKEY::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformPOKEY::getRegisterPool() {
if (useAltASAP) {
return const_cast<unsigned char*>(altASAP.getRegisterPool());
} else {
return regPool;
}
}
int DivPlatformPOKEY::getRegisterPoolSize() {
return 16;
}
void DivPlatformPOKEY::reset() {
while (!writes.empty()) writes.pop();
memset(regPool,0,16);
for (int i=0; i<4; i++) {
chan[i]=DivPlatformPOKEY::Channel();
chan[i].std.setEngine(parent);
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
if (useAltASAP) {
altASAP.reset();
} else {
ResetPokeyState(&pokey);
}
audctl=0;
audctlChanged=true;
skctl=3;
skctlChanged=true;
}
bool DivPlatformPOKEY::keyOffAffectsArp(int ch) {
return true;
}
float DivPlatformPOKEY::getPostAmp() {
return 2.0f;
}
void DivPlatformPOKEY::notifyInsDeletion(void* ins) {
for (int i=0; i<4; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformPOKEY::setFlags(const DivConfig& flags) {
if (flags.getInt("clockSel",0)) {
chipClock=COLOR_PAL*2.0/5.0;
} else {
chipClock=COLOR_NTSC/2.0;
}
CHECK_CUSTOM_CLOCK;
if (useAltASAP) {
rate=chipClock/7;
for (int i=0; i<4; i++) {
oscBuf[i]->rate=rate/2;
}
altASAP.init(chipClock,rate);
altASAP.reset();
} else {
rate=chipClock;
for (int i=0; i<4; i++) {
oscBuf[i]->rate=rate/14;
}
}
}
void DivPlatformPOKEY::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformPOKEY::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
int DivPlatformPOKEY::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
oscBufDelay=0;
for (int i=0; i<4; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
if (!useAltASAP) {
MZPOKEYSND_Init(&pokey);
}
setFlags(flags);
reset();
return 6;
}
void DivPlatformPOKEY::quit() {
for (int i=0; i<4; i++) {
delete oscBuf[i];
}
}
void DivPlatformPOKEY::setAltASAP(bool value) {
useAltASAP=value;
}
DivPlatformPOKEY::~DivPlatformPOKEY() {
}
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