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furnace/src/engine/platform/ay8930.cpp
tildearrow e95258ad91 AEGJDSKADFGIOGSHBJSFKAL;FS
2022-01-31 17:28:17 -05:00

456 lines
12 KiB
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#include "ay8930.h"
#include "../engine.h"
#include "sound/ay8910.h"
#include <string.h>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define CHIP_DIVIDER 8
void DivPlatformAY8930::acquire(short* bufL, short* bufR, size_t start, size_t len) {
if (ayBufLen<len) {
ayBufLen=len;
for (int i=0; i<3; i++) {
delete[] ayBuf[i];
ayBuf[i]=new short[ayBufLen];
}
}
while (!writes.empty()) {
QueuedWrite w=writes.front();
if (bank!=(w.addr>>4)) {
bank=w.addr>>4;
ay->address_w(0x0d);
ay->data_w(0xa0|(bank<<4)|ayEnvMode[0]);
}
ay->address_w(w.addr&15);
if (w.addr==0x0d) {
ay->data_w(0xa0|(bank<<4)|(w.val&15));
} else {
ay->data_w(w.val);
}
writes.pop();
}
ay->sound_stream_update(ayBuf,len);
if (stereo) {
for (size_t i=0; i<len; i++) {
bufL[i+start]=ayBuf[0][i]+ayBuf[1][i];
bufR[i+start]=ayBuf[1][i]+ayBuf[2][i];
}
} else {
for (size_t i=0; i<len; i++) {
bufL[i+start]=ayBuf[0][i]+ayBuf[1][i]+ayBuf[2][i];
bufR[i+start]=bufL[i+start];
}
}
}
const unsigned char regPeriodL[3]={
0x0b, 0x10, 0x12
};
const unsigned char regPeriodH[3]={
0x0c, 0x11, 0x13
};
const unsigned char regMode[3]={
0x0d, 0x14, 0x15
};
void DivPlatformAY8930::tick() {
// PSG
for (int i=0; i<3; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=MIN(31,chan[i].std.vol)-(31-(chan[i].vol&31));
if (chan[i].outVol<0) chan[i].outVol=0;
if (isMuted[i]) {
rWrite(0x08+i,0);
} else {
rWrite(0x08+i,(chan[i].outVol&31)|((chan[i].psgMode&4)<<3));
}
}
if (chan[i].std.hadArp) {
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) {
rWrite(0x06,chan[i].std.duty);
}
if (chan[i].std.hadWave) {
chan[i].psgMode=(chan[i].std.wave+1)&7;
if (isMuted[i]) {
rWrite(0x08+i,0);
} else {
rWrite(0x08+i,(chan[i].outVol&31)|((chan[i].psgMode&4)<<3));
}
}
if (chan[i].std.hadEx1) { // duty
rWrite(0x16+i,chan[i].std.ex1);
}
if (chan[i].std.hadEx2) {
ayEnvMode[i]=chan[i].std.ex2;
rWrite(regMode[i],ayEnvMode[i]);
}
if (chan[i].std.hadEx3) {
chan[i].autoEnvNum=chan[i].std.ex3;
chan[i].freqChanged=true;
if (!chan[i].std.willAlg) chan[i].autoEnvDen=1;
}
if (chan[i].std.hadAlg) {
chan[i].autoEnvDen=chan[i].std.alg;
chan[i].freqChanged=true;
if (!chan[i].std.willEx3) chan[i].autoEnvNum=1;
}
if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
if (chan[i].freq>4095) chan[i].freq=4095;
if (chan[i].keyOn) {
if (chan[i].insChanged) {
if (!chan[i].std.willEx1) immWrite(0x16+i,chan[i].duty);
chan[i].insChanged=false;
}
}
if (chan[i].keyOff) {
rWrite(0x08+i,0);
}
rWrite((i)<<1,chan[i].freq&0xff);
rWrite(1+((i)<<1),chan[i].freq>>8);
if (chan[i].keyOn) chan[i].keyOn=false;
if (chan[i].keyOff) chan[i].keyOff=false;
if (chan[i].freqChanged && chan[i].autoEnvNum>0 && chan[i].autoEnvDen>0) {
ayEnvPeriod[i]=(chan[i].freq*chan[i].autoEnvDen/chan[i].autoEnvNum)>>4;
immWrite(regPeriodL[i],ayEnvPeriod[i]);
immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
}
chan[i].freqChanged=false;
}
if (ayEnvSlide[i]!=0) {
ayEnvSlideLow[i]+=ayEnvSlide[i];
while (ayEnvSlideLow[i]>7) {
ayEnvSlideLow[i]-=8;
if (ayEnvPeriod[i]<0xffff) {
ayEnvPeriod[i]++;
immWrite(regPeriodL[i],ayEnvPeriod[i]);
immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
}
}
while (ayEnvSlideLow[i]<-7) {
ayEnvSlideLow[i]+=8;
if (ayEnvPeriod[i]>0) {
ayEnvPeriod[i]--;
immWrite(regPeriodL[i],ayEnvPeriod[i]);
immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
}
}
}
}
rWrite(0x07,
~((chan[0].psgMode&1)|
((chan[1].psgMode&1)<<1)|
((chan[2].psgMode&1)<<2)|
((chan[0].psgMode&2)<<2)|
((chan[1].psgMode&2)<<3)|
((chan[2].psgMode&2)<<4)));
for (int i=0; i<32; i++) {
if (pendingWrites[i]!=oldWrites[i]) {
immWrite(i,pendingWrites[i]&0xff);
oldWrites[i]=pendingWrites[i];
}
}
}
int DivPlatformAY8930::dispatch(DivCommand c) {
switch (c.cmd) {
case DIV_CMD_NOTE_ON: {
DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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].std.init(ins);
if (isMuted[c.chan]) {
rWrite(0x08+c.chan,0);
} else {
rWrite(0x08+c.chan,(chan[c.chan].vol&31)|((chan[c.chan].psgMode&4)<<3));
}
break;
}
case DIV_CMD_NOTE_OFF:
chan[c.chan].keyOff=true;
chan[c.chan].active=false;
chan[c.chan].std.init(NULL);
break;
case DIV_CMD_VOLUME: {
chan[c.chan].vol=c.value;
if (!chan[c.chan].std.hasVol) {
chan[c.chan].outVol=c.value;
}
if (isMuted[c.chan]) {
rWrite(0x08+c.chan,0);
} else {
if (chan[c.chan].active) rWrite(0x08+c.chan,(chan[c.chan].vol&31)|((chan[c.chan].psgMode&4)<<3));
}
break;
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;
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;
break;
}
case DIV_CMD_STD_NOISE_MODE:
if (c.value<0x10) {
chan[c.chan].psgMode=(c.value+1)&7;
if (isMuted[c.chan]) {
rWrite(0x08+c.chan,0);
} else if (chan[c.chan].active) {
rWrite(0x08+c.chan,(chan[c.chan].outVol&31)|((chan[c.chan].psgMode&4)<<3));
}
} else {
chan[c.chan].duty=c.value&15;
immWrite(0x16,chan[c.chan].duty);
}
break;
case DIV_CMD_STD_NOISE_FREQ:
rWrite(0x06,c.value);
break;
case DIV_CMD_AY_ENVELOPE_SET:
ayEnvMode[c.chan]=c.value>>4;
rWrite(regMode[c.chan],ayEnvMode[c.chan]);
if (c.value&15) {
chan[c.chan].psgMode|=4;
} else {
chan[c.chan].psgMode&=~4;
}
if (isMuted[c.chan]) {
rWrite(0x08+c.chan,0);
} else {
rWrite(0x08+c.chan,(chan[c.chan].vol&31)|((chan[c.chan].psgMode&4)<<3));
}
break;
case DIV_CMD_AY_ENVELOPE_LOW:
ayEnvPeriod[c.chan]&=0xff00;
ayEnvPeriod[c.chan]|=c.value;
immWrite(regPeriodL[c.chan],ayEnvPeriod[c.chan]);
immWrite(regPeriodH[c.chan],ayEnvPeriod[c.chan]>>8);
break;
case DIV_CMD_AY_ENVELOPE_HIGH:
ayEnvPeriod[c.chan]&=0xff;
ayEnvPeriod[c.chan]|=c.value<<8;
immWrite(regPeriodL[c.chan],ayEnvPeriod[c.chan]);
immWrite(regPeriodH[c.chan],ayEnvPeriod[c.chan]>>8);
break;
case DIV_CMD_AY_ENVELOPE_SLIDE:
ayEnvSlide[c.chan]=c.value;
break;
case DIV_CMD_AY_NOISE_MASK_AND:
ayNoiseAnd=c.value;
immWrite(0x19,ayNoiseAnd);
break;
case DIV_CMD_AY_NOISE_MASK_OR:
ayNoiseOr=c.value;
immWrite(0x1a,ayNoiseOr);
break;
case DIV_CMD_AY_AUTO_ENVELOPE:
chan[c.chan].autoEnvNum=c.value>>4;
chan[c.chan].autoEnvDen=c.value&15;
chan[c.chan].freqChanged=true;
break;
case DIV_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 31;
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_PRE_NOTE:
break;
default:
//printf("WARNING: unimplemented command %d\n",c.cmd);
break;
}
return 1;
}
void DivPlatformAY8930::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (isMuted[ch]) {
rWrite(0x08+ch,0);
} else {
rWrite(0x08+ch,(chan[ch].outVol&31)|((chan[ch].psgMode&4)<<3));
}
}
void DivPlatformAY8930::forceIns() {
for (int i=0; i<3; i++) {
chan[i].insChanged=true;
immWrite(regPeriodL[i],ayEnvPeriod[i]);
immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
immWrite(regMode[i],ayEnvMode[i]);
}
}
void* DivPlatformAY8930::getChanState(int ch) {
return &chan[ch];
}
void DivPlatformAY8930::reset() {
while (!writes.empty()) writes.pop();
ay->device_reset();
for (int i=0; i<3; i++) {
chan[i]=DivPlatformAY8930::Channel();
chan[i].vol=31;
ayEnvPeriod[i]=0;
ayEnvMode[i]=0;
ayEnvSlide[i]=0;
ayEnvSlideLow[i]=0;
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
for (int i=0; i<32; i++) {
oldWrites[i]=-1;
pendingWrites[i]=-1;
}
ayNoiseAnd=2;
ayNoiseOr=0;
delay=0;
extMode=false;
bank=false;
immWrite(0x0d,0xa0);
immWrite(0x19,2); // and mask
immWrite(0x1a,0x00); // or mask
}
bool DivPlatformAY8930::isStereo() {
return true;
}
bool DivPlatformAY8930::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformAY8930::notifyInsDeletion(void* ins) {
for (int i=0; i<3; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformAY8930::setFlags(unsigned int flags) {
switch (flags&15) {
case 1:
chipClock=COLOR_PAL*2.0/5.0;
break;
case 2:
chipClock=1750000;
break;
case 3:
chipClock=2000000;
break;
case 4:
chipClock=1500000;
break;
case 5:
chipClock=1000000;
break;
case 6:
chipClock=COLOR_NTSC/4.0;
break;
case 7:
chipClock=COLOR_PAL*3.0/8.0;
break;
case 8:
chipClock=COLOR_PAL*3.0/16.0;
break;
default:
chipClock=COLOR_NTSC/2.0;
break;
}
rate=chipClock/8;
stereo=flags>>6;
}
int DivPlatformAY8930::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<3; i++) {
isMuted[i]=false;
}
setFlags(flags);
ay=new ay8930_device(rate);
ay->device_start();
ayBufLen=65536;
for (int i=0; i<3; i++) ayBuf[i]=new short[ayBufLen];
reset();
return 3;
}
void DivPlatformAY8930::quit() {
for (int i=0; i<3; i++) delete[] ayBuf[i];
delete ay;
}
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