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furnace/src/engine/platform/nes.cpp
tildearrow d691ec6d76 add a chip playground 
in debug menu
2022-02-01 18:08:19 -05:00

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#include "nes.h"
#include "sound/nes/cpu_inline.h"
#include "../engine.h"
#include <cstddef>
#include <math.h>
#define CHIP_DIVIDER 16
#define rWrite(a,v) if (!skipRegisterWrites) {apu_wr_reg(nes,a,v); if (dumpWrites) {addWrite(a,v);} }
void DivPlatformNES::acquire(short* bufL, short* bufR, size_t start, size_t len) {
for (size_t i=start; i<start+len; i++) {
if (dacSample!=-1) {
dacPeriod+=dacRate;
if (dacPeriod>=rate) {
DivSample* s=parent->song.sample[dacSample];
if (s->rendLength>0) {
if (!isMuted[4]) {
if (s->depth==8) {
rWrite(0x4011,((unsigned char)s->rendData[dacPos]+0x80)>>1);
} else {
rWrite(0x4011,((unsigned short)s->rendData[dacPos]+0x8000)>>9);
}
}
if (++dacPos>=s->rendLength) {
if (s->loopStart>=0 && s->loopStart<=(int)s->rendLength) {
dacPos=s->loopStart;
} else {
dacSample=-1;
}
}
dacPeriod-=rate;
} else {
dacSample=-1;
}
}
}
apu_tick(nes,NULL);
nes->apu.odd_cycle=!nes->apu.odd_cycle;
if (nes->apu.clocked) {
nes->apu.clocked=false;
}
bufL[i]=(pulse_output(nes)+tnd_output(nes))*30;
}
}
static unsigned char noiseTable[256]={
6, 6, 6, 6, 6, 6, 6, 6, 6, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 14, 13, 12, 11, 10, 9, 8, 7, 6, 5, 4,
3, 2, 1, 0, 11, 10, 9, 8, 7, 6, 5, 4,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15, 15,
15
};
void DivPlatformNES::tick() {
for (int i=0; i<4; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
// ok, why are the volumes like that?
chan[i].outVol=MIN(15,chan[i].std.vol)-(15-(chan[i].vol&15));
if (chan[i].outVol<0) chan[i].outVol=0;
if (i==2) { // triangle
rWrite(0x4000+i*4,(chan[i].outVol==0)?0:255);
chan[i].freqChanged=true;
} else {
rWrite(0x4000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
}
}
if (chan[i].std.hadArp) {
if (i==3) { // noise
if (chan[i].std.arpMode) {
chan[i].baseFreq=chan[i].std.arp;
} else {
chan[i].baseFreq=chan[i].note+chan[i].std.arp;
}
if (chan[i].baseFreq>255) chan[i].baseFreq=255;
if (chan[i].baseFreq<0) chan[i].baseFreq=0;
} else {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=NOTE_PERIODIC(chan[i].std.arp);
} else {
chan[i].baseFreq=NOTE_PERIODIC(chan[i].note+chan[i].std.arp);
}
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=NOTE_PERIODIC(chan[i].note);
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty) {
chan[i].duty=chan[i].std.duty;
if (i==3 && chan[i].duty>1) chan[i].duty=1;
if (i!=2) {
rWrite(0x4000+i*4,0x30|chan[i].outVol|((chan[i].duty&3)<<6));
}
if (i==3) { // noise
chan[i].freqChanged=true;
}
}
if (chan[i].sweepChanged) {
chan[i].sweepChanged=false;
if (i==0) {
//rWrite(16+i*5,chan[i].sweep);
}
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
if (i==3) { // noise
chan[i].freq=noiseTable[chan[i].baseFreq];
} else {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
if (chan[i].freq>2047) chan[i].freq=2047;
}
if (chan[i].keyOn) {
//rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
//rWrite(16+i*5+2,((chan[i].vol<<4))|(ins->gb.envLen&7)|((ins->gb.envDir&1)<<3));
}
if (chan[i].keyOff) {
//rWrite(16+i*5+2,8);
if (i==2) { // triangle
rWrite(0x4000+i*4,0x00);
} else {
rWrite(0x4000+i*4,0x30);
}
}
if (i==3) { // noise
rWrite(0x4002+i*4,(chan[i].duty<<7)|chan[i].freq);
rWrite(0x4003+i*4,0xf0);
} else {
rWrite(0x4002+i*4,chan[i].freq&0xff);
if ((chan[i].prevFreq>>8)!=(chan[i].freq>>8) || i==2) {
rWrite(0x4003+i*4,0xf8|(chan[i].freq>>8));
}
if (chan[i].freq!=65535 && chan[i].freq!=0) {
chan[i].prevFreq=chan[i].freq;
}
}
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
chan[i].freqChanged=false;
}
}
// PCM
if (chan[4].freqChanged) {
chan[4].freq=parent->calcFreq(chan[4].baseFreq,chan[4].pitch,false);
if (chan[4].furnaceDac) {
dacRate=MIN(chan[4].freq,32000);
if (dumpWrites) addWrite(0xffff0001,dacRate);
}
chan[4].freqChanged=false;
}
}
int DivPlatformNES::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON:
if (c.chan==4) { // PCM
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
if (ins->type==DIV_INS_AMIGA) {
dacSample=ins->amiga.initSample;
if (dacSample<0 || dacSample>=parent->song.sampleLen) {
dacSample=-1;
if (dumpWrites) addWrite(0xffff0002,0);
break;
} else {
if (dumpWrites) addWrite(0xffff0000,dacSample);
}
dacPos=0;
dacPeriod=0;
chan[c.chan].baseFreq=parent->song.tuning*pow(2.0f,((float)(c.value+3)/12.0f));
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].furnaceDac=true;
} else {
dacSample=12*sampleBank+c.value%12;
if (dacSample>=parent->song.sampleLen) {
dacSample=-1;
if (dumpWrites) addWrite(0xffff0002,0);
break;
} else {
if (dumpWrites) addWrite(0xffff0000,dacSample);
}
dacPos=0;
dacPeriod=0;
dacRate=parent->song.sample[dacSample]->rate;
if (dumpWrites) addWrite(0xffff0001,dacRate);
chan[c.chan].furnaceDac=false;
}
break;
} else if (c.chan==3) { // noise
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=c.value;
}
} else {
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=NOTE_PERIODIC(c.value);
}
}
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].freqChanged=true;
chan[c.chan].note=c.value;
}
chan[c.chan].active=true;
chan[c.chan].keyOn=true;
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
if (c.chan==2) {
rWrite(0x4000+c.chan*4,0xff);
} else {
rWrite(0x4000+c.chan*4,0x30|chan[c.chan].vol|((chan[c.chan].duty&3)<<6));
}
break;
case DIV_CMD_NOTE_OFF:
if (c.chan==4) {
dacSample=-1;
if (dumpWrites) addWrite(0xffff0002,0);
}
chan[c.chan].active=false;
chan[c.chan].keyOff=true;
chan[c.chan].std.init(NULL);
break;
case DIV_CMD_INSTRUMENT:
if (chan[c.chan].ins!=c.value || c.value2==1) {
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;
}
if (chan[c.chan].active) {
if (c.chan==2) {
rWrite(0x4000+c.chan*4,0xff);
} else {
rWrite(0x4000+c.chan*4,0x30|chan[c.chan].vol|((chan[c.chan].duty&3)<<6));
}
}
}
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_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_STD_NOISE_MODE:
chan[c.chan].duty=c.value;
if (c.chan==3) { // noise
chan[c.chan].freqChanged=true;
}
break;
case DIV_CMD_SAMPLE_BANK:
sampleBank=c.value;
if (sampleBank>(parent->song.sample.size()/12)) {
sampleBank=parent->song.sample.size()/12;
}
break;
case DIV_CMD_LEGATO:
if (c.chan==3) break;
chan[c.chan].baseFreq=NOTE_PERIODIC(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:
chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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 DivPlatformNES::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
rWrite(0x4015,(!isMuted[0])|((!isMuted[1])<<1)|((!isMuted[2])<<2)|((!isMuted[3])<<3)|((!isMuted[4])<<4));
if (isMuted[4]) {
rWrite(0x4011,0);
}
}
void DivPlatformNES::forceIns() {
for (int i=0; i<5; i++) {
chan[i].insChanged=true;
chan[i].prevFreq=65535;
}
}
void* DivPlatformNES::getChanState(int ch) {
return &chan[ch];
}
void DivPlatformNES::reset() {
for (int i=0; i<5; i++) {
chan[i]=DivPlatformNES::Channel();
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
dacPeriod=0;
dacPos=0;
dacRate=0;
dacSample=-1;
sampleBank=0;
apu_turn_on(nes,apuType);
nes->apu.cpu_cycles=0;
nes->apu.cpu_opcode_cycle=0;
rWrite(0x4015,(!isMuted[0])|((!isMuted[1])<<1)|((!isMuted[2])<<2)|((!isMuted[3])<<3)|((!isMuted[4])<<4));
rWrite(0x4001,0x08);
rWrite(0x4005,0x08);
}
bool DivPlatformNES::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformNES::setFlags(unsigned int flags) {
if (flags==2) { // Dendy
rate=COLOR_PAL*2.0/5.0;
apuType=2;
nes->apu.type=apuType;
} else if (flags==1) { // PAL
rate=COLOR_PAL*3.0/8.0;
apuType=1;
nes->apu.type=apuType;
} else { // NTSC
rate=COLOR_NTSC/2.0;
apuType=0;
nes->apu.type=apuType;
}
chipClock=rate;
}
void DivPlatformNES::notifyInsDeletion(void* ins) {
for (int i=0; i<5; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformNES::poke(unsigned int addr, unsigned short val) {
rWrite(addr,val);
}
void DivPlatformNES::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
}
int DivPlatformNES::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
parent=p;
apuType=flags;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<5; i++) {
isMuted[i]=false;
}
nes=new struct NESAPU;
setFlags(flags);
init_nla_table(500,500);
reset();
return 5;
}
void DivPlatformNES::quit() {
delete nes;
}
DivPlatformNES::~DivPlatformNES() {
}
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