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furnace/src/engine/platform/sms.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 "sms.h"
#include "../engine.h"
#include "../../ta-log.h"
#include <math.h>
#define rWrite(a,v) {if (!skipRegisterWrites) {writes.push(QueuedWrite(a,v)); if (dumpWrites) {addWrite(a,v);}}}
const char* regCheatSheetSN[]={
"DATA", "0",
NULL
};
const char* regCheatSheetGG[]={
"DATA", "0",
"Stereo", "1",
NULL
};
const char** DivPlatformSMS::getRegisterSheet() {
return stereo?regCheatSheetGG:regCheatSheetSN;
}
float DivPlatformSMS::getPostAmp() {
return 1.5f;
}
void DivPlatformSMS::poolWrite(unsigned short a, unsigned char v) {
if (a) {
regPool[9]=v;
} else {
if (v>=0x80) {
regPool[(v>>4)&7]&=~15;
regPool[(v>>4)&7]|=v&15;
chanLatch=(v>>5)&3;
} else {
regPool[chanLatch<<1]&=15;
regPool[chanLatch<<1]|=((v&15)<<4);
regPool[1+(chanLatch<<1)]&=15;
regPool[1+(chanLatch<<1)]|=v&0xf0;
}
}
}
void DivPlatformSMS::acquire_nuked(short** buf, size_t len) {
int oL=0;
int oR=0;
for (size_t h=0; h<len; h++) {
if (!writes.empty()) {
QueuedWrite w=writes.front();
if (w.addr==0) {
YMPSG_Write(&sn_nuked,w.val);
} else if (w.addr==1) {
YMPSG_WriteStereo(&sn_nuked,w.val);
}
poolWrite(w.addr,w.val);
writes.pop();
}
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_Clock(&sn_nuked);
YMPSG_GetOutput(&sn_nuked,&oL,&oR);
if (oL<-32768) oL=-32768;
if (oL>32767) oL=32767;
if (oR<-32768) oR=-32768;
if (oR>32767) oR=32767;
buf[0][h]=oL;
if (stereo) buf[1][h]=oR;
for (int i=0; i<4; i++) {
if (isMuted[i]) {
oscBuf[i]->data[oscBuf[i]->needle++]=0;
} else {
oscBuf[i]->data[oscBuf[i]->needle++]=sn_nuked.vol_table[sn_nuked.volume_out[i]]*3;
}
}
}
}
void DivPlatformSMS::acquire_mame(short** buf, size_t len) {
while (!writes.empty()) {
QueuedWrite w=writes.front();
if (stereo && (w.addr==1))
sn->stereo_w(w.val);
else if (w.addr==0) {
sn->write(w.val);
}
poolWrite(w.addr,w.val);
writes.pop();
}
for (size_t h=0; h<len; h++) {
short* outs[2]={
&buf[0][h],
stereo?(&buf[1][h]):NULL
};
sn->sound_stream_update(outs,1);
for (int i=0; i<4; i++) {
if (isMuted[i]) {
oscBuf[i]->data[oscBuf[i]->needle++]=0;
} else {
oscBuf[i]->data[oscBuf[i]->needle++]=sn->get_channel_output(i)*3;
}
}
}
}
void DivPlatformSMS::acquire(short** buf, size_t len) {
if (nuked) {
acquire_nuked(buf,len);
} else {
acquire_mame(buf,len);
}
}
double DivPlatformSMS::NOTE_SN(int ch, int note) {
double CHIP_DIVIDER=toneDivider;
if (ch==3) CHIP_DIVIDER=noiseDivider;
if (parent->song.linearPitch==2 || !easyNoise) {
return NOTE_PERIODIC(note);
}
int easyStartingPeriod=16;
int easyThreshold=round(12.0*log((chipClock/(easyStartingPeriod*CHIP_DIVIDER))/(0.0625*parent->song.tuning))/log(2.0))-3;
if (note>easyThreshold) {
return MAX(0,easyStartingPeriod-(note-easyThreshold));
}
return NOTE_PERIODIC(note);
}
int DivPlatformSMS::snCalcFreq(int ch) {
double CHIP_DIVIDER=toneDivider;
if (ch==3) CHIP_DIVIDER=noiseDivider;
int easyStartingPeriod=16;
int easyThreshold=round(128.0*12.0*log((chipClock/(easyStartingPeriod*CHIP_DIVIDER))/(0.0625*parent->song.tuning))/log(2.0))-384+64;
if (parent->song.linearPitch==2 && easyNoise && chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2>(easyThreshold)) {
int ret=(((easyStartingPeriod<<7))-(chan[ch].baseFreq+chan[ch].pitch+chan[ch].pitch2-(easyThreshold)))>>7;
if (ret<0) ret=0;
return ret;
}
return parent->calcFreq(chan[ch].baseFreq,chan[ch].pitch,chan[ch].fixedArp?chan[ch].baseNoteOverride:chan[ch].arpOff,chan[ch].fixedArp,true,0,chan[ch].pitch2,chipClock,CHIP_DIVIDER);
}
void DivPlatformSMS::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_LOG(chan[i].std.vol.val,chan[i].vol,15);
if (chan[i].outVol<0) chan[i].outVol=0;
// old formula
// ((chan[i].vol&15)*MIN(15,chan[i].std.vol.val))>>4;
chan[i].writeVol=true;
}
if (NEW_ARP_STRAT) {
chan[i].handleArp();
} else if (chan[i].std.arp.had) {
if (!chan[i].inPorta) {
// TODO: add compatibility flag. this is horrible.
int areYouSerious=parent->calcArp(chan[i].note,chan[i].std.arp.val);
if (!easyNoise) while (areYouSerious>0x60) areYouSerious-=12;
chan[i].baseFreq=NOTE_SN(i,areYouSerious);
chan[i].actualNote=areYouSerious;
chan[i].freqChanged=true;
}
}
if (i==3) {
if (chan[i].std.duty.had) {
if (chan[i].std.duty.val!=snNoiseMode || parent->song.snDutyReset) {
snNoiseMode=chan[i].std.duty.val;
if (chan[i].std.duty.val<2) {
chan[3].freqChanged=false;
}
updateSNMode=true;
}
}
if (chan[i].std.phaseReset.had) {
if (chan[i].std.phaseReset.val==1) {
updateSNMode=true;
}
}
}
if (stereo) {
if (chan[i].std.panL.had) {
lastPan&=~(0x11<<i);
lastPan|=((chan[i].std.panL.val&1)<<i)|(((chan[i].std.panL.val>>1)&1)<<(i+4));
rWrite(1,lastPan);
}
}
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;
}
}
for (int i=0; i<3; i++) {
if (chan[i].freqChanged) {
chan[i].freq=snCalcFreq(i);
if (chan[i].freq>1023) chan[i].freq=1023;
if (parent->song.snNoLowPeriods) {
if (chan[i].freq<8) chan[i].freq=1;
} else {
if (chan[i].freq<0) chan[i].freq=0;
}
//if (chan[i].actualNote>0x5d) chan[i].freq=0x01;
rWrite(0,0x80|i<<5|(chan[i].freq&15));
rWrite(0,chan[i].freq>>4);
// what?
/*if (i==2 && snNoiseMode&2) {
chan[3].baseFreq=chan[2].baseFreq;
chan[3].actualNote=chan[2].actualNote;
}*/
chan[i].freqChanged=false;
}
}
if (chan[3].freqChanged || updateSNMode) {
chan[3].freq=snCalcFreq(3);
//parent->calcFreq(chan[3].baseFreq,chan[3].pitch,chan[3].fixedArp?chan[3].baseNoteOverride:chan[3].arpOff,chan[3].fixedArp,true,0,chan[3].pitch2,chipClock,noiseDivider);
if (chan[3].freq>1023) chan[3].freq=1023;
if (parent->song.snNoLowPeriods) {
if (chan[3].actualNote>0x5d) chan[3].freq=0x01;
}
if (chan[3].freq<0) chan[3].freq=0;
if (snNoiseMode&2) { // take period from channel 3
if (updateSNMode || resetPhase) {
if (snNoiseMode&1) {
rWrite(0,0xe7);
} else {
rWrite(0,0xe3);
}
if (updateSNMode) {
rWrite(0,0xdf);
}
}
if (chan[3].freqChanged) {
rWrite(0,0xc0|(chan[3].freq&15));
rWrite(0,chan[3].freq>>4);
}
} else { // 3 fixed values
unsigned char value;
// TODO: new arp?
if (chan[3].std.arp.had) {
value=parent->calcArp(chan[3].note,chan[3].std.arp.val)%12;
} else { // pardon?
value=chan[3].note%12;
}
if (value<3) {
value=2-value;
if (value!=oldValue || updateSNMode || resetPhase) {
oldValue=value;
rWrite(0,0xe0|value|((snNoiseMode&1)<<2));
}
}
}
chan[3].freqChanged=false;
updateSNMode=false;
}
for (int i=0; i<4; i++) {
if (chan[i].writeVol) {
rWrite(0,0x90|(i<<5)|(isMuted[i]?15:(15-(chan[i].outVol&15))));
chan[i].writeVol=false;
}
}
}
int DivPlatformSMS::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=NOTE_SN(c.chan,c.value);
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
chan[c.chan].actualNote=c.value;
}
chan[c.chan].active=true;
//if (!parent->song.brokenOutVol2) {
chan[c.chan].writeVol=true;
chan[c.chan].outVol=chan[c.chan].vol;
//rWrite(0,0x90|c.chan<<5|(isMuted[c.chan]?15:(15-(chan[c.chan].vol&15))));
//}
chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_STD));
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;
rWrite(0,0x9f|c.chan<<5);
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:
chan[c.chan].ins=c.value;
//chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_STD));
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].writeVol=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_NOTE_PORTA: {
int destFreq=NOTE_SN(c.chan,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:
snNoiseMode=(c.value&1)|((c.value&16)>>3);
updateSNMode=true;
break;
case DIV_CMD_PANNING: {
if (stereo) {
if (c.chan>3) c.chan=3;
lastPan&=~(0x11<<c.chan);
int pan=0;
if (c.value>0) pan|=0x10;
if (c.value2>0) pan|=0x01;
if (pan==0) pan=0x11;
lastPan|=pan<<c.chan;
rWrite(1,lastPan);
}
break;
}
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=NOTE_SN(c.chan,c.value+((HACKY_LEGATO_MESS)?(chan[c.chan].std.arp.val):(0)));
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_STD));
}
if (!chan[c.chan].inPorta && c.value && !parent->song.brokenPortaArp && chan[c.chan].std.arp.will && !NEW_ARP_STRAT) chan[c.chan].baseFreq=NOTE_SN(c.chan,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 0;
break;
default:
break;
}
return 1;
}
void DivPlatformSMS::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (chan[ch].active) chan[ch].writeVol=true;
}
void DivPlatformSMS::forceIns() {
for (int i=0; i<4; i++) {
if (chan[i].active) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
}
updateSNMode=true;
}
void* DivPlatformSMS::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformSMS::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformSMS::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformSMS::getRegisterPool() {
return regPool;
}
int DivPlatformSMS::getRegisterPoolSize() {
return stereo?9:8;
}
void DivPlatformSMS::reset() {
memset(regPool,0,16);
chanLatch=0;
while (!writes.empty()) writes.pop();
for (int i=0; i<4; i++) {
chan[i]=DivPlatformSMS::Channel();
chan[i].std.setEngine(parent);
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
sn->device_start();
YMPSG_Init(&sn_nuked,isRealSN,12,isRealSN?13:15,isRealSN?16383:32767);
snNoiseMode=3;
rWrite(0,0xe7);
updateSNMode=true;
oldValue=0xff;
lastPan=0xff;
if (stereo) {
rWrite(1,0xff);
}
}
int DivPlatformSMS::getOutputCount() {
return stereo?2:1;
}
bool DivPlatformSMS::keyOffAffectsArp(int ch) {
return true;
}
bool DivPlatformSMS::keyOffAffectsPorta(int ch) {
return true;
}
int DivPlatformSMS::getPortaFloor(int ch) {
return 12;
}
void DivPlatformSMS::notifyInsDeletion(void* ins) {
for (int i=0; i<4; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformSMS::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformSMS::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
void DivPlatformSMS::setFlags(const DivConfig& flags) {
switch (flags.getInt("clockSel",0)) {
case 1:
chipClock=COLOR_PAL*4.0/5.0;
break;
case 2:
chipClock=4000000;
break;
case 3:
chipClock=COLOR_NTSC/2.0;
break;
case 4:
chipClock=3000000;
break;
case 5:
chipClock=2000000;
break;
case 6:
chipClock=COLOR_NTSC/8.0;
break;
default:
chipClock=COLOR_NTSC;
break;
}
CHECK_CUSTOM_CLOCK;
resetPhase=!flags.getBool("noPhaseReset",false);
easyNoise=!flags.getBool("noEasyNoise",false);
divider=16;
toneDivider=64.0;
noiseDivider=64.0;
if (sn!=NULL) delete sn;
switch (flags.getInt("chipType",0)) {
case 1: // TI SN76489
sn=new sn76489_device();
isRealSN=true;
stereo=false;
noiseDivider=60.0; // 64 for match to tone frequency on non-Sega PSG but compatibility
break;
case 2: // TI+Atari
sn=new sn76496_base_device(0x4000, 0x0f35, 0x01, 0x02, true, false, 1/*8*/, false, true);
isRealSN=true;
stereo=false;
noiseDivider=60.0;
break;
case 3: // Game Gear (not fully emulated yet!)
sn=new gamegear_device();
isRealSN=false;
stereo=true;
break;
case 4: // TI SN76489A
sn=new sn76489a_device();
isRealSN=false; // TODO
stereo=false;
noiseDivider=60.0;
break;
case 5: // TI SN76496
sn=new sn76496_device();
isRealSN=false; // TODO
stereo=false;
noiseDivider=60.0;
break;
case 6: // NCR 8496
sn=new ncr8496_device();
isRealSN=false;
stereo=false;
noiseDivider=60.0;
break;
case 7: // Tandy PSSJ 3-voice sound
sn=new pssj3_device();
isRealSN=false;
stereo=false;
noiseDivider=60.0;
break;
case 8: // TI SN94624
sn=new sn94624_device();
isRealSN=true;
stereo=false;
divider=2;
toneDivider=8.0;
noiseDivider=7.5;
break;
case 9: // TI SN76494
sn=new sn76494_device();
isRealSN=false; // TODO
stereo=false;
divider=2;
toneDivider=8.0;
noiseDivider=7.5;
break;
default: // Sega
sn=new segapsg_device();
isRealSN=false;
stereo=false;
break;
}
rate=chipClock/divider;
for (int i=0; i<4; i++) {
oscBuf[i]->rate=rate;
}
}
void DivPlatformSMS::setNuked(bool value) {
nuked=value;
}
int DivPlatformSMS::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
resetPhase=false;
oldValue=0xff;
lastPan=0xff;
for (int i=0; i<4; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
sn=NULL;
setFlags(flags);
reset();
return 4;
}
void DivPlatformSMS::quit() {
for (int i=0; i<4; i++) {
delete oscBuf[i];
}
if (sn!=NULL) delete sn;
}
DivPlatformSMS::~DivPlatformSMS() {
}
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