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furnace/src/engine/platform/saa.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 "saa.h"
#include "../engine.h"
#include "sound/saa1099.h"
#include <string.h>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {writes.push(QueuedWrite(a,v)); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 2
const char* regCheatSheetSAA[]={
"Vol0", "00",
"Vol1", "01",
"Vol2", "02",
"Vol3", "03",
"Vol4", "04",
"Vol5", "05",
"Freq0", "08",
"Freq1", "09",
"Freq2", "0A",
"Freq3", "0B",
"Freq4", "0C",
"Freq5", "0D",
"Octave10", "10",
"Octave32", "11",
"Octave54", "12",
"ToneOn", "14",
"NoiseOn", "15",
"NoiseCtl", "16",
"EnvCtl0", "18",
"EnvCtl1", "19",
"Power", "1C",
NULL
};
const char** DivPlatformSAA1099::getRegisterSheet() {
return regCheatSheetSAA;
}
void DivPlatformSAA1099::acquire_saaSound(short** buf, size_t len) {
if (saaBufLen<len*2) {
saaBufLen=len*2;
for (int i=0; i<2; i++) {
delete[] saaBuf[i];
saaBuf[i]=new short[saaBufLen];
}
}
while (!writes.empty()) {
QueuedWrite w=writes.front();
saa_saaSound->WriteAddressData(w.addr,w.val);
regPool[w.addr&0x1f]=w.val;
writes.pop();
}
saa_saaSound->GenerateMany((unsigned char*)saaBuf[0],len,oscBuf);
#ifdef TA_BIG_ENDIAN
for (size_t i=0; i<len; i++) {
buf[0][i]=(short)((((unsigned short)saaBuf[0][i<<1])<<8)|(((unsigned short)saaBuf[0][i<<1])>>8));
buf[1][i]=(short)((((unsigned short)saaBuf[0][1+(i<<1)])<<8)|(((unsigned short)saaBuf[0][1+(i<<1)])>>8));
}
#else
for (size_t i=0; i<len; i++) {
buf[0][i]=saaBuf[0][i<<1];
buf[1][i]=saaBuf[0][1+(i<<1)];
}
#endif
}
void DivPlatformSAA1099::acquire(short** buf, size_t len) {
acquire_saaSound(buf,len);
}
inline unsigned char applyPan(unsigned char vol, unsigned char pan) {
return ((vol*(pan>>4))/15)|(((vol*(pan&15))/15)<<4);
}
void DivPlatformSAA1099::tick(bool sysTick) {
for (int i=0; i<6; i++) {
chan[i].std.next();
if (chan[i].std.vol.had) {
chan[i].outVol=VOL_SCALE_LINEAR_BROKEN(chan[i].vol&15,MIN(15,chan[i].std.vol.val),15);
if (chan[i].outVol<0) chan[i].outVol=0;
if (isMuted[i]) {
rWrite(i,0);
} else {
rWrite(i,applyPan(chan[i].outVol&15,chan[i].pan));
}
}
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) {
saaNoise[i/3]=chan[i].std.duty.val&3;
rWrite(0x16,saaNoise[0]|(saaNoise[1]<<4));
}
if (chan[i].std.wave.had) {
chan[i].psgMode=chan[i].std.wave.val&3;
}
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) {
if (isMuted[i]) {
rWrite(i,0);
} else {
if (chan[i].std.vol.had) {
if (chan[i].active) rWrite(i,applyPan(chan[i].outVol&15,chan[i].pan));
} else {
if (chan[i].active) rWrite(i,applyPan(chan[i].vol&15,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.ex1.had) {
saaEnv[i/3]=chan[i].std.ex1.val;
rWrite(0x18+(i/3),saaEnv[i/3]);
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=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].freq>65535) chan[i].freq=65535;
if (chan[i].freq>=32768) {
chan[i].freqH=7;
} else if (chan[i].freq>=16384) {
chan[i].freqH=6;
} else if (chan[i].freq>=8192) {
chan[i].freqH=5;
} else if (chan[i].freq>=4096) {
chan[i].freqH=4;
} else if (chan[i].freq>=2048) {
chan[i].freqH=3;
} else if (chan[i].freq>=1024) {
chan[i].freqH=2;
} else if (chan[i].freq>=512) {
chan[i].freqH=1;
} else {
chan[i].freqH=0;
}
chan[i].freqL=0xff-(chan[i].freq>>chan[i].freqH);
chan[i].freqH=7-chan[i].freqH;
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].keyOn) {
}
if (chan[i].keyOff) {
rWrite(i,0);
}
rWrite(0x08+i,chan[i].freqL);
rWrite(0x10+(i>>1),chan[i&6].freqH|(chan[1+(i&6)].freqH<<4));
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
rWrite(0x14,(chan[0].psgMode&1)|
((chan[1].psgMode&1)<<1)|
((chan[2].psgMode&1)<<2)|
((chan[3].psgMode&1)<<3)|
((chan[4].psgMode&1)<<4)|
((chan[5].psgMode&1)<<5)
);
rWrite(0x15,((chan[0].psgMode&2)>>1)|
(chan[1].psgMode&2)|
((chan[2].psgMode&2)<<1)|
((chan[3].psgMode&2)<<2)|
((chan[4].psgMode&2)<<3)|
((chan[5].psgMode&2)<<4)
);
}
int DivPlatformSAA1099::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins,DIV_INS_SAA1099);
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;
}
if (isMuted[c.chan]) {
rWrite(c.chan,0);
} else {
rWrite(c.chan,applyPan(chan[c.chan].vol&15,chan[c.chan].pan));
}
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].keyOff=true;
chan[c.chan].active=false;
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_VOLUME: {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.vol.has) {
chan[c.chan].outVol=c.value;
}
if (isMuted[c.chan]) {
rWrite(c.chan,0);
} else {
if (chan[c.chan].active) rWrite(c.chan,applyPan(chan[c.chan].vol&15,chan[c.chan].pan));
}
break;
}
case DIV_CMD_GET_VOLUME: {
return chan[c.chan].vol;
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_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*((parent->song.linearPitch==2)?1:(8-chan[c.chan].freqH));
if (chan[c.chan].baseFreq>=destFreq) {
chan[c.chan].baseFreq=destFreq;
return2=true;
}
} else {
chan[c.chan].baseFreq-=c.value*((parent->song.linearPitch==2)?1:(8-chan[c.chan].freqH));
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_PANNING:
chan[c.chan].pan=(c.value&0xf0)|(c.value2>>4);
if (isMuted[c.chan]) {
rWrite(c.chan,0);
} else {
if (chan[c.chan].active) rWrite(c.chan,applyPan(chan[c.chan].vol&15,chan[c.chan].pan));
}
break;
case DIV_CMD_LEGATO: {
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_STD_NOISE_MODE:
chan[c.chan].psgMode=(c.value&1)|((c.value&16)>>3);
break;
case DIV_CMD_STD_NOISE_FREQ:
saaNoise[c.chan/3]=(c.value&1)|((c.value&16)>>3);
rWrite(0x16,saaNoise[0]|(saaNoise[1]<<4));
break;
case DIV_CMD_SAA_ENVELOPE:
saaEnv[c.chan/3]=c.value;
rWrite(0x18+(c.chan/3),c.value);
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;
case DIV_CMD_GET_VOLMAX:
return 15;
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_SAA1099));
}
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_PRE_NOTE:
break;
default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
break;
}
return 1;
}
void DivPlatformSAA1099::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (isMuted[ch]) {
rWrite(ch,0);
} else {
if (chan[ch].active) rWrite(ch,applyPan(chan[ch].outVol&15,chan[ch].pan));
}
}
void DivPlatformSAA1099::forceIns() {
for (int i=0; i<6; i++) {
chan[i].insChanged=true;
chan[i].freqChanged=true;
}
rWrite(0x18,saaEnv[0]);
rWrite(0x19,saaEnv[1]);
rWrite(0x16,saaNoise[0]|(saaNoise[1]<<4));
}
void* DivPlatformSAA1099::getChanState(int ch) {
return &chan[ch];
}
DivMacroInt* DivPlatformSAA1099::getChanMacroInt(int ch) {
return &chan[ch].std;
}
DivDispatchOscBuffer* DivPlatformSAA1099::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformSAA1099::getRegisterPool() {
return regPool;
}
int DivPlatformSAA1099::getRegisterPoolSize() {
return 32;
}
void DivPlatformSAA1099::reset() {
while (!writes.empty()) writes.pop();
memset(regPool,0,32);
saa_saaSound->Clear();
for (int i=0; i<6; i++) {
chan[i]=DivPlatformSAA1099::Channel();
chan[i].std.setEngine(parent);
chan[i].vol=0x0f;
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
lastBusy=60;
dacMode=0;
dacPeriod=0;
dacPos=0;
dacRate=0;
dacSample=-1;
sampleBank=0;
saaEnv[0]=0;
saaEnv[1]=0;
saaNoise[0]=0;
saaNoise[1]=0;
delay=0;
extMode=false;
rWrite(8,255);
rWrite(9,255);
rWrite(10,255);
rWrite(11,255);
rWrite(12,255);
rWrite(13,255);
rWrite(16,0x77);
rWrite(17,0x77);
rWrite(18,0x77);
rWrite(0x1c,2);
rWrite(0x1c,1);
}
int DivPlatformSAA1099::getOutputCount() {
return 2;
}
int DivPlatformSAA1099::getPortaFloor(int ch) {
return 12;
}
bool DivPlatformSAA1099::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformSAA1099::notifyInsDeletion(void* ins) {
for (int i=0; i<6; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformSAA1099::setFlags(const DivConfig& flags) {
int clockSel=flags.getInt("clockSel",0);
if (clockSel==2) {
chipClock=COLOR_PAL*8.0/5.0;
} else if (clockSel==1) {
chipClock=COLOR_NTSC*2.0;
} else {
chipClock=8000000;
}
CHECK_CUSTOM_CLOCK;
rate=chipClock/32;
for (int i=0; i<6; i++) {
oscBuf[i]->rate=rate;
}
saa_saaSound->SetClockRate(chipClock);
saa_saaSound->SetSampleRate(rate);
}
void DivPlatformSAA1099::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformSAA1099::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
int DivPlatformSAA1099::init(DivEngine* p, int channels, int sugRate, const DivConfig& flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
saa_saaSound=NULL;
for (int i=0; i<6; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
}
saa_saaSound=CreateCSAASound();
saa_saaSound->SetOversample(1);
saa_saaSound->SetSoundParameters(SAAP_NOFILTER|SAAP_16BIT|SAAP_STEREO);
setFlags(flags);
saaBufLen=65536;
for (int i=0; i<2; i++) saaBuf[i]=new short[saaBufLen];
reset();
return 3;
}
void DivPlatformSAA1099::quit() {
for (int i=0; i<6; i++) {
delete oscBuf[i];
}
if (saa_saaSound!=NULL) {
DestroyCSAASound(saa_saaSound);
saa_saaSound=NULL;
}
for (int i=0; i<2; i++) delete[] saaBuf[i];
}
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