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furnace/src/engine/platform/saa.cpp
tildearrow e87239f8ce fix retrigger implementation 
no longer broken
2022-01-19 00:01:34 -05:00

327 lines
8.5 KiB
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#include "saa.h"
#include "../engine.h"
#include "sound/saa1099.h"
#include <string.h>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
#define PSG_FREQ_BASE 122240.0f
void DivPlatformSAA1099::acquire(short* bufL, short* bufR, size_t start, size_t len) {
if (saaBufLen<len) {
saaBufLen=len;
for (int i=0; i<2; i++) {
delete[] saaBuf[i];
saaBuf[i]=new short[saaBufLen];
}
}
while (!writes.empty()) {
QueuedWrite w=writes.front();
saa.control_w(w.addr);
saa.data_w(w.val);
writes.pop();
}
saa.sound_stream_update(saaBuf,len);
for (size_t i=0; i<len; i++) {
bufL[i+start]=saaBuf[0][i];
bufR[i+start]=saaBuf[1][i];
}
}
inline unsigned char applyPan(unsigned char vol, unsigned char pan) {
return ((vol*(pan>>4))/15)|(((vol*(pan&15))/15)<<4);
}
void DivPlatformSAA1099::tick() {
for (int i=0; i<6; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=chan[i].std.vol-(15-(chan[i].vol&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 (chan[i].std.hadArp) {
if (!chan[i].inPorta) {
if (chan[i].std.arpMode) {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
} else {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
}
}
chan[i].freqChanged=true;
} else {
if (chan[i].std.arpMode && chan[i].std.finishedArp) {
chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
chan[i].freqChanged=true;
}
}
if (chan[i].std.hadDuty) {
saaNoise[i/3]=chan[i].std.duty&3;
rWrite(0x16,saaNoise[0]|(saaNoise[1]<<4));
}
if (chan[i].std.hadWave) {
chan[i].psgMode=chan[i].std.wave&3;
}
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>=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);
if (c.value!=DIV_NOTE_NULL) {
chan[c.chan].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
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(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].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(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=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
bool return2=false;
if (destFreq>chan[c.chan].baseFreq) {
chan[c.chan].baseFreq+=c.value*(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*(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;
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=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
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_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 15;
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 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::reset() {
while (!writes.empty()) writes.pop();
saa=saa1099_device();
for (int i=0; i<6; i++) {
chan[i]=DivPlatformSAA1099::Channel();
chan[i].vol=0x0f;
}
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(0x1c,1);
}
bool DivPlatformSAA1099::isStereo() {
return true;
}
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::setPAL(bool pal) {
if (pal) {
rate=250000;
} else {
rate=250000;
}
}
int DivPlatformSAA1099::init(DivEngine* p, int channels, int sugRate, bool pal) {
parent=p;
dumpWrites=false;
skipRegisterWrites=false;
for (int i=0; i<6; i++) {
isMuted[i]=false;
}
setPAL(pal);
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<2; i++) delete[] saaBuf[i];
}
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