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furnace/src/engine/platform/n163.cpp
cam900 e6d74766ca Add support of N163 demultiplexed output 
so, there's to way for reduce N163 noises: reduce channel limit and demultiplex
* channel limit is runtime changeable and it makes some usable effects with disable demultiplex
* demultiplex is used for "non-ear destroyable" emulators, but less hardware accurate. (when LPF and RF filter is not considered)
Furnace support both after this, You can choose output behavior via configuration flag.
2022-04-10 20:22:49 +09:00

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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 "n163.h"
#include "../engine.h"
#include <math.h>
#define rRead(a,v) n163.addr_w(a); n163.data_r(v);
#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define rWriteMask(a,v,m) if (!skipRegisterWrites) {writes.emplace(a,v,m); if (dumpWrites) {addWrite(a,v);} }
#define chWrite(c,a,v) \
if (c<=chanMax) { \
rWrite(0x78-(c<<3)+(a&7),v) \
}
#define chWriteMask(c,a,v,m) \
if (c<=chanMax) { \
rWriteMask(0x78-(c<<3)+(a&7),v,m) \
}
#define CHIP_FREQBASE (15*32768)
const char* regCheatSheetN163[]={
"FreqL7", "40",
"AccL7", "41",
"FreqM7", "42",
"AccM7", "43",
"WavLen_FreqH7", "44",
"AccH7", "45",
"WavPos7", "46",
"Vol7", "47",
"FreqL6", "48",
"AccL6", "49",
"FreqM6", "4A",
"AccM6", "4B",
"WavLen_FreqH6", "4C",
"AccH6", "4D",
"WavPos6", "4E",
"Vol6", "4F",
"FreqL5", "50",
"AccL5", "51",
"FreqM5", "52",
"AccM5", "53",
"WavLen_FreqH5", "54",
"AccH5", "55",
"WavPos5", "56",
"Vol5", "57",
"FreqL4", "58",
"AccL4", "59",
"FreqM4", "5A",
"AccM4", "5B",
"WavLen_FreqH4", "5C",
"AccH4", "5D",
"WavPos4", "5E",
"Vol4", "5F",
"FreqL3", "60",
"AccL3", "61",
"FreqM3", "62",
"AccM3", "63",
"WavLen_FreqH3", "64",
"AccH3", "65",
"WavPos3", "66",
"Vol3", "67",
"FreqL2", "68",
"AccL2", "69",
"FreqM2", "6A",
"AccM2", "6B",
"WavLen_FreqH2", "6C",
"AccH2", "6D",
"WavPos2", "6E",
"Vol2", "6F",
"FreqL1", "70",
"AccL1", "71",
"FreqM1", "72",
"AccM1", "73",
"WavLen_FreqH1", "74",
"AccH1", "75",
"WavPos1", "76",
"Vol1", "77",
"FreqL0", "78",
"AccL0", "79",
"FreqM0", "7A",
"AccM0", "7B",
"WavLen_FreqH0", "7C",
"AccH0", "7D",
"WavPos0", "7E",
"ChanMax_Vol0", "7F",
NULL
};
const char** DivPlatformN163::getRegisterSheet() {
return regCheatSheetN163;
}
const char* DivPlatformN163::getEffectName(unsigned char effect) {
switch (effect) {
case 0x10:
return "10xx: Select waveform";
break;
case 0x11:
return "11xx: Set waveform position in RAM (single nibble unit)";
break;
case 0x12:
return "12xx: Set waveform length in RAM (04 to FC, 4 nibble unit)";
break;
case 0x13:
return "130x: Change waveform update mode (0: off, bit 0: update now, bit 1: update when every waveform changes)";
break;
case 0x14:
return "14xx: Select waveform for load to RAM";
break;
case 0x15:
return "15xx: Set waveform position for load to RAM (single nibble unit)";
break;
case 0x16:
return "16xx: Set waveform length for load to RAM (04 to FC, 4 nibble unit)";
break;
case 0x17:
return "170x: Change waveform load mode (0: off, bit 0: load now, bit 1: load when every waveform changes)";
break;
case 0x18:
return "180x: Change channel limits (0 to 7, x + 1)";
break;
case 0x20:
return "20xx: (Global) Select waveform for load to RAM";
break;
case 0x21:
return "21xx: (Global) Set waveform position for load to RAM (single nibble unit)";
break;
case 0x22:
return "22xx: (Global) Set waveform length for load to RAM (04 to FC, 4 nibble unit)";
break;
case 0x23:
return "230x: (Global) Change waveform load mode (0: off, bit 0: load now, bit 1: load when every waveform changes)";
break;
}
return NULL;
}
void DivPlatformN163::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+len; i++) {
n163.tick();
int out=((n163.out()<<6)*2); // scale to 16 bit
if (out>32767) out=32767;
if (out<-32768) out=-32768;
bufL[i]=bufR[i]=out;
// command queue
while (!writes.empty()) {
QueuedWrite w=writes.front();
n163.addr_w(w.addr);
n163.data_w((n163.data_r()&~w.mask)|(w.val&w.mask));
writes.pop();
}
}
}
void DivPlatformN163::updateWave(int wave, int pos, int len) {
len&=0xfc; // 4 nibble boundary
DivWavetable* wt=parent->getWave(wave);
for (int i=0; i<len; i++) {
unsigned char addr=(pos+i); // address (nibble each)
if (addr>=((0x78-(chanMax<<3))<<1)) { // avoid conflict with channel register area
break;
}
unsigned char mask=(addr&1)?0xf0:0x0f;
if (wt->max<1 || wt->len<1) {
rWriteMask(addr>>1,0,mask);
} else {
int data=wt->data[i*wt->len/len]*15/wt->max;
if (data<0) data=0;
if (data>15) data=15;
rWriteMask(addr>>1,(addr&1)?(data<<4):(data&0xf),mask);
}
}
}
void DivPlatformN163::updateWaveCh(int ch) {
if (ch<=chanMax) {
updateWave(chan[ch].wave,chan[ch].wavePos,chan[ch].waveLen);
if (chan[ch].active && !isMuted[ch]) {
chan[ch].volumeChanged=true;
}
}
}
void DivPlatformN163::tick() {
for (int i=0; i<=chanMax; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=(MIN(15,chan[i].std.vol)*(chan[i].vol&15))/15;
if (chan[i].outVol<0) chan[i].outVol=0;
if (chan[i].outVol>15) chan[i].outVol=15;
if (chan[i].resVol!=chan[i].outVol) {
chan[i].resVol=chan[i].outVol;
if (!isMuted[i]) {
chan[i].volumeChanged=true;
}
}
}
if (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].std.arp);
} else {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note+(signed char)chan[i].std.arp);
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=NOTE_FREQUENCY(chan[i].note);
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty) {
if (chan[i].wavePos!=chan[i].std.duty) {
chan[i].wavePos=chan[i].std.duty;
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
}
chan[i].waveChanged=true;
}
}
if (chan[i].std.hadWave) {
if (chan[i].wave!=chan[i].std.wave) {
chan[i].wave=chan[i].std.wave;
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
}
}
}
if (chan[i].std.hadEx1) {
if (chan[i].waveLen!=(chan[i].std.ex1&0xfc)) {
chan[i].waveLen=chan[i].std.ex1&0xfc;
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
}
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadEx2) {
if ((chan[i].waveMode&0x2)!=(chan[i].std.ex2&0x2)) { // update when every waveform changed
chan[i].waveMode=(chan[i].waveMode&~0x2)|(chan[i].std.ex2&0x2);
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
chan[i].waveChanged=true;
}
}
if ((chan[i].waveMode&0x1)!=(chan[i].std.ex2&0x1)) { // update waveform now
chan[i].waveMode=(chan[i].waveMode&~0x1)|(chan[i].std.ex2&0x1);
if (chan[i].waveMode&0x1) { // rising edge
chan[i].waveUpdated=true;
chan[i].waveChanged=true;
}
}
}
if (chan[i].std.hadEx3) {
if (chan[i].loadWave!=chan[i].std.ex3) {
chan[i].loadWave=chan[i].std.ex3;
if (chan[i].loadMode&0x2) {
updateWave(chan[i].loadWave,chan[i].loadPos,chan[i].loadLen&0xfc);
}
}
}
if (chan[i].std.hadAlg) {
if (chan[i].loadPos!=chan[i].std.alg) {
chan[i].loadPos=chan[i].std.alg;
}
}
if (chan[i].std.hadFb) {
if (chan[i].loadLen!=(chan[i].std.fb&0xfc)) {
chan[i].loadLen=chan[i].std.fb&0xfc;
}
}
if (chan[i].std.hadFms) {
if ((chan[i].loadMode&0x2)!=(chan[i].std.fms&0x2)) { // load when every waveform changes
chan[i].loadMode=(chan[i].loadMode&~0x2)|(chan[i].std.fms&0x2);
}
if ((chan[i].loadMode&0x1)!=(chan[i].std.fms&0x1)) { // load now
chan[i].loadMode=(chan[i].loadMode&~0x1)|(chan[i].std.fms&0x1);
if (chan[i].loadMode&0x1) { // rising edge
updateWave(chan[i].loadWave,chan[i].loadPos,chan[i].loadLen&0xfc);
}
}
}
if (chan[i].volumeChanged) {
if (chan[i].active && !isMuted[i]) {
chWriteMask(i,0x7,chan[i].resVol&0xf,0xf);
} else {
chWriteMask(i,0x7,0,0xf);
}
chan[i].volumeChanged=false;
}
if (chan[i].waveChanged) {
chWrite(i,0x6,chan[i].wavePos);
if (chan[i].active) {
chan[i].freqChanged=true;
}
chan[i].waveChanged=false;
}
if (chan[i].waveUpdated) {
updateWaveCh(i);
if (chan[i].active) {
if (!chan[i].keyOff) chan[i].keyOn=true;
}
chan[i].waveUpdated=false;
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq((((chan[i].baseFreq*chan[i].waveLen)*(chanMax+1))/16),chan[i].pitch,false,0);
if (chan[i].freq<0) chan[i].freq=0;
if (chan[i].freq>0x3ffff) chan[i].freq=0x3ffff;
if (chan[i].keyOn) {
if (chan[i].wave<0) {
chan[i].wave=0;
if (chan[i].waveMode&0x2) {
updateWaveCh(i);
}
}
}
if (chan[i].keyOff && !isMuted[i]) {
chWriteMask(i,0x7,0,0xf);
}
chWrite(i,0x0,chan[i].freq&0xff);
chWrite(i,0x2,chan[i].freq>>8);
chWrite(i,0x4,((256-chan[i].waveLen)&0xfc)|((chan[i].freq>>16)&3));
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
}
int DivPlatformN163::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
if (chan[c.chan].insChanged) {
chan[c.chan].wave=ins->n163.wave;
chan[c.chan].wavePos=ins->n163.wavePos;
chan[c.chan].waveLen=ins->n163.waveLen;
chan[c.chan].waveMode=ins->n163.waveMode;
chan[c.chan].waveChanged=true;
if (chan[c.chan].waveMode&0x3) {
chan[c.chan].waveUpdated=true;
}
chan[c.chan].insChanged=false;
}
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].resVol=chan[c.chan].vol;
if (!isMuted[c.chan]) {
chan[c.chan].volumeChanged=true;
}
chan[c.chan].std.init(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].std.init(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.hasVol) {
chan[c.chan].outVol=c.value;
chan[c.chan].resVol=chan[c.chan].outVol;
} else {
chan[c.chan].resVol=chan[c.chan].vol;
}
if (!isMuted[c.chan]) {
chan[c.chan].volumeChanged=true;
}
}
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_WAVE:
chan[c.chan].wave=c.value;
if (chan[c.chan].waveMode&0x2) {
chan[c.chan].waveUpdated=true;
}
chan[c.chan].keyOn=true;
break;
case DIV_CMD_N163_WAVE_POSITION:
chan[c.chan].wavePos=c.value;
if (chan[c.chan].waveMode&0x2) {
chan[c.chan].waveUpdated=true;
}
chan[c.chan].waveChanged=true;
break;
case DIV_CMD_N163_WAVE_LENGTH:
chan[c.chan].waveLen=c.value&0xfc;
if (chan[c.chan].waveMode&0x2) {
chan[c.chan].waveUpdated=true;
}
chan[c.chan].freqChanged=true;
break;
case DIV_CMD_N163_WAVE_MODE:
chan[c.chan].waveMode=c.value&0x3;
if (chan[c.chan].waveMode&0x3) { // update now
chan[c.chan].waveUpdated=true;
chan[c.chan].waveChanged=true;
}
break;
case DIV_CMD_N163_WAVE_LOAD:
chan[c.chan].loadWave=c.value;
if (chan[c.chan].loadMode&0x2) { // load when every waveform changes
updateWave(chan[c.chan].loadWave,chan[c.chan].loadPos,chan[c.chan].loadLen);
}
break;
case DIV_CMD_N163_WAVE_LOADPOS:
chan[c.chan].loadPos=c.value;
break;
case DIV_CMD_N163_WAVE_LOADLEN:
chan[c.chan].loadLen=c.value&0xfc;
break;
case DIV_CMD_N163_WAVE_LOADMODE:
chan[c.chan].loadMode=c.value&0x3;
if (chan[c.chan].loadMode&0x1) { // load now
updateWave(chan[c.chan].loadWave,chan[c.chan].loadPos,chan[c.chan].loadLen);
}
break;
case DIV_CMD_N163_GLOBAL_WAVE_LOAD:
loadWave=c.value;
if (loadMode&0x2) { // load when every waveform changes
updateWave(loadWave,loadPos,loadLen);
}
break;
case DIV_CMD_N163_GLOBAL_WAVE_LOADPOS:
loadPos=c.value;
break;
case DIV_CMD_N163_GLOBAL_WAVE_LOADLEN:
loadLen=c.value&0xfc;
break;
case DIV_CMD_N163_GLOBAL_WAVE_LOADMODE:
loadMode=c.value&0x3;
if (loadMode&0x3) { // load now
updateWave(loadWave,loadPos,loadLen);
}
break;
case DIV_CMD_N163_CHANNEL_LIMIT:
if (chanMax!=(c.value&0x7)) {
chanMax=c.value&0x7;
rWriteMask(0x7f,chanMax<<4,0x70);
forceIns();
}
break;
case DIV_CMD_LEGATO:
chan[c.chan].baseFreq=NOTE_FREQUENCY(c.value+((chan[c.chan].std.willArp && !chan[c.chan].std.arpMode)?(chan[c.chan].std.arp):(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].std.init(parent->getIns(chan[c.chan].ins));
chan[c.chan].keyOn=true;
}
}
chan[c.chan].inPorta=c.value;
break;
case DIV_CMD_GET_VOLMAX:
return 15;
break;
case DIV_ALWAYS_SET_VOLUME:
return 1;
break;
default:
break;
}
return 1;
}
void DivPlatformN163::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
chan[ch].volumeChanged=true;
}
void DivPlatformN163::forceIns() {
for (int i=0; i<=chanMax; i++) {
chan[i].insChanged=true;
if (chan[i].active) {
chan[i].keyOn=true;
chan[i].freqChanged=true;
chan[i].volumeChanged=true;
chan[i].waveChanged=true;
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
}
}
}
}
void DivPlatformN163::notifyWaveChange(int wave) {
for (int i=0; i<8; i++) {
if (chan[i].wave==wave) {
if (chan[i].waveMode&0x2) {
chan[i].waveUpdated=true;
}
}
}
}
void DivPlatformN163::notifyInsChange(int ins) {
for (int i=0; i<8; i++) {
if (chan[i].ins==ins) {
chan[i].insChanged=true;
}
}
}
void DivPlatformN163::notifyInsDeletion(void* ins) {
for (int i=0; i<8; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void* DivPlatformN163::getChanState(int ch) {
return &chan[ch];
}
unsigned char* DivPlatformN163::getRegisterPool() {
for (int i=0; i<128; i++) {
regPool[i]=n163.reg(i);
}
return regPool;
}
int DivPlatformN163::getRegisterPoolSize() {
return 128;
}
void DivPlatformN163::reset() {
while (!writes.empty()) writes.pop();
for (int i=0; i<8; i++) {
chan[i]=DivPlatformN163::Channel();
}
n163.reset();
memset(regPool,0,128);
n163.set_disable(false);
n163.set_multiplex(multiplex);
chanMax=initChanMax;
loadWave=-1;
loadPos=0;
loadLen=0;
loadMode=0;
rWrite(0x7f,initChanMax<<4);
}
void DivPlatformN163::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformN163::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
void DivPlatformN163::setFlags(unsigned int flags) {
switch (flags&0xf) {
case 0x0: // NTSC
rate=COLOR_NTSC/2.0;
break;
case 0x1: // PAL
rate=COLOR_PAL*3.0/8.0;
break;
case 0x2: // Dendy
rate=COLOR_PAL*2.0/5.0;
break;
}
initChanMax=chanMax=(flags>>4)&7;
multiplex=((flags>>7)&1)?false:true; // not accurate in real hardware
chipClock=rate;
rate/=15;
n163.set_multiplex(multiplex);
rWrite(0x7f,initChanMax<<4);
}
int DivPlatformN163::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<8; i++) {
isMuted[i]=false;
}
setFlags(flags);
reset();
return 8;
}
void DivPlatformN163::quit() {
}
DivPlatformN163::~DivPlatformN163() {
}
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