prepare for SAA1099
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tildearrow
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6 changed files with 876 additions and 0 deletions
336
src/engine/platform/saa.cpp
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336
src/engine/platform/saa.cpp
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#include "saa.h"
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#include "../engine.h"
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#include "sound/saa1099.h"
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#include <string.h>
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#include <math.h>
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#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
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#define immWrite(a,v) if (!skipRegisterWrites) {writes.emplace(a,v);}
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#define PSG_FREQ_BASE 6848.0f
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void DivPlatformSAA1099::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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if (ayBufLen<len) {
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ayBufLen=len;
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for (int i=0; i<3; i++) {
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delete[] ayBuf[i];
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ayBuf[i]=new short[ayBufLen];
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}
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}
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while (!writes.empty()) {
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QueuedWrite w=writes.front();
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saa.control_w(w.addr);
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saa.data_w(w.val);
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writes.pop();
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}
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saa.sound_stream_update(ayBuf,len);
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for (size_t i=0; i<len; i++) {
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bufL[i+start]=ayBuf[0][i]+ayBuf[1][i]+ayBuf[2][i];
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bufR[i+start]=ayBuf[0][i]+ayBuf[1][i]+ayBuf[2][i];
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}
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}
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void DivPlatformSAA1099::tick() {
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// PSG
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for (int i=0; i<3; i++) {
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chan[i].std.next();
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if (chan[i].std.hadVol) {
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chan[i].outVol=chan[i].std.vol-(15-chan[i].vol);
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if (chan[i].outVol<0) chan[i].outVol=0;
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if (isMuted[i]) {
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rWrite(0x08+i,0);
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} else {
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rWrite(0x08+i,(chan[i].outVol&15)|((chan[i].psgMode&4)<<2));
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}
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}
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if (chan[i].std.hadArp) {
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if (!chan[i].inPorta) {
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if (chan[i].std.arpMode) {
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chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].std.arp)/12.0f)));
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} else {
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chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note+chan[i].std.arp-12)/12.0f)));
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}
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}
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chan[i].freqChanged=true;
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} else {
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if (chan[i].std.arpMode && chan[i].std.finishedArp) {
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chan[i].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)(chan[i].note)/12.0f)));
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chan[i].freqChanged=true;
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}
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}
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if (chan[i].std.hadDuty) {
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rWrite(0x06,31-chan[i].std.duty);
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}
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if (chan[i].std.hadWave) {
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chan[i].psgMode&=4;
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chan[i].psgMode|=(chan[i].std.wave+1)&3;
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}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
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chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true);
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if (chan[i].freq>4095) chan[i].freq=4095;
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if (chan[i].keyOn) {
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//rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
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//rWrite(16+i*5+2,((chan[i].vol<<4))|(ins->gb.envLen&7)|((ins->gb.envDir&1)<<3));
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}
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if (chan[i].keyOff) {
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rWrite(0x08+i,0);
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}
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rWrite((i)<<1,chan[i].freq&0xff);
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rWrite(1+((i)<<1),chan[i].freq>>8);
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if (chan[i].keyOn) chan[i].keyOn=false;
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if (chan[i].keyOff) chan[i].keyOff=false;
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chan[i].freqChanged=false;
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}
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}
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rWrite(0x07,
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~((chan[0].psgMode&1)|
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((chan[1].psgMode&1)<<1)|
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((chan[2].psgMode&1)<<2)|
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((chan[0].psgMode&2)<<2)|
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((chan[1].psgMode&2)<<3)|
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((chan[2].psgMode&2)<<4)));
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if (ayEnvSlide!=0) {
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ayEnvSlideLow+=ayEnvSlide;
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while (ayEnvSlideLow>7) {
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ayEnvSlideLow-=8;
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if (ayEnvPeriod<0xffff) {
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ayEnvPeriod++;
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immWrite(0x0b,ayEnvPeriod);
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immWrite(0x0c,ayEnvPeriod>>8);
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}
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}
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while (ayEnvSlideLow<-7) {
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ayEnvSlideLow+=8;
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if (ayEnvPeriod>0) {
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ayEnvPeriod--;
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immWrite(0x0b,ayEnvPeriod);
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immWrite(0x0c,ayEnvPeriod>>8);
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}
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}
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}
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for (int i=0; i<16; i++) {
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if (pendingWrites[i]!=oldWrites[i]) {
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immWrite(i,pendingWrites[i]&0xff);
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oldWrites[i]=pendingWrites[i];
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}
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}
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}
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int DivPlatformSAA1099::dispatch(DivCommand c) {
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switch (c.cmd) {
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case DIV_CMD_NOTE_ON: {
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DivInstrument* ins=parent->getIns(chan[c.chan].ins);
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chan[c.chan].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
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chan[c.chan].freqChanged=true;
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chan[c.chan].note=c.value;
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chan[c.chan].active=true;
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chan[c.chan].keyOn=true;
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chan[c.chan].std.init(ins);
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if (isMuted[c.chan]) {
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rWrite(0x08+c.chan,0);
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} else {
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rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
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}
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break;
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}
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case DIV_CMD_NOTE_OFF:
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chan[c.chan].keyOff=true;
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chan[c.chan].active=false;
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chan[c.chan].std.init(NULL);
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break;
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case DIV_CMD_VOLUME: {
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chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.hasVol) {
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chan[c.chan].outVol=c.value;
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}
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if (isMuted[c.chan]) {
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rWrite(0x08+c.chan,0);
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} else {
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if (chan[c.chan].active) rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
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}
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break;
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break;
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}
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case DIV_CMD_GET_VOLUME: {
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return chan[c.chan].vol;
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break;
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}
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case DIV_CMD_INSTRUMENT:
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if (chan[c.chan].ins!=c.value) {
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chan[c.chan].insChanged=true;
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}
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chan[c.chan].ins=c.value;
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break;
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case DIV_CMD_PITCH: {
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chan[c.chan].pitch=c.value;
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chan[c.chan].freqChanged=true;
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break;
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}
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value2/12.0f)));
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bool return2=false;
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if (destFreq>chan[c.chan].baseFreq) {
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chan[c.chan].baseFreq+=c.value;
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if (chan[c.chan].baseFreq>=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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} else {
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chan[c.chan].baseFreq-=c.value;
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if (chan[c.chan].baseFreq<=destFreq) {
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chan[c.chan].baseFreq=destFreq;
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return2=true;
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}
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}
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chan[c.chan].freqChanged=true;
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if (return2) {
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chan[c.chan].inPorta=false;
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return 2;
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}
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break;
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}
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case DIV_CMD_LEGATO: {
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chan[c.chan].baseFreq=round(PSG_FREQ_BASE/pow(2.0f,((float)c.value/12.0f)));
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chan[c.chan].freqChanged=true;
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break;
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}
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case DIV_CMD_STD_NOISE_FREQ:
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rWrite(0x06,31-c.value);
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break;
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case DIV_CMD_AY_ENVELOPE_SET:
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ayEnvMode=c.value>>4;
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rWrite(0x0d,ayEnvMode);
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if (c.value&15) {
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chan[c.chan].psgMode|=4;
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} else {
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chan[c.chan].psgMode&=~4;
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}
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if (isMuted[c.chan]) {
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rWrite(0x08+c.chan,0);
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} else {
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rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
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}
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break;
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case DIV_CMD_AY_ENVELOPE_LOW:
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ayEnvPeriod&=0xff00;
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ayEnvPeriod|=c.value;
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immWrite(0x0b,ayEnvPeriod);
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immWrite(0x0c,ayEnvPeriod>>8);
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break;
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case DIV_CMD_AY_ENVELOPE_HIGH:
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ayEnvPeriod&=0xff;
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ayEnvPeriod|=c.value<<8;
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immWrite(0x0b,ayEnvPeriod);
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immWrite(0x0c,ayEnvPeriod>>8);
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break;
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case DIV_CMD_AY_ENVELOPE_SLIDE:
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ayEnvSlide=c.value;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 0;
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break;
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case DIV_CMD_GET_VOLMAX:
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return 15;
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break;
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case DIV_CMD_PRE_PORTA:
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chan[c.chan].std.init(parent->getIns(chan[c.chan].ins));
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chan[c.chan].inPorta=c.value;
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break;
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case DIV_CMD_PRE_NOTE:
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break;
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default:
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//printf("WARNING: unimplemented command %d\n",c.cmd);
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break;
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}
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return 1;
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}
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void DivPlatformSAA1099::muteChannel(int ch, bool mute) {
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isMuted[ch]=mute;
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if (isMuted[ch]) {
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rWrite(0x08+ch,0);
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} else {
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rWrite(0x08+ch,(chan[ch].outVol&15)|((chan[ch].psgMode&4)<<2));
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}
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}
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void DivPlatformSAA1099::forceIns() {
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for (int i=0; i<3; i++) {
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chan[i].insChanged=true;
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}
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immWrite(0x0b,ayEnvPeriod);
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immWrite(0x0c,ayEnvPeriod>>8);
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immWrite(0x0d,ayEnvMode);
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}
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void DivPlatformSAA1099::reset() {
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while (!writes.empty()) writes.pop();
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saa=saa1099_device();
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for (int i=0; i<3; i++) {
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chan[i]=DivPlatformSAA1099::Channel();
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chan[i].vol=0x0f;
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}
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for (int i=0; i<16; i++) {
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oldWrites[i]=-1;
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pendingWrites[i]=-1;
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}
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lastBusy=60;
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dacMode=0;
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dacPeriod=0;
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dacPos=0;
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dacRate=0;
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dacSample=-1;
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sampleBank=0;
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ayEnvPeriod=0;
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ayEnvMode=0;
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ayEnvSlide=0;
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ayEnvSlideLow=0;
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delay=0;
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extMode=false;
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}
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bool DivPlatformSAA1099::isStereo() {
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return false;
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}
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bool DivPlatformSAA1099::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformSAA1099::notifyInsDeletion(void* ins) {
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for (int i=0; i<3; i++) {
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chan[i].std.notifyInsDeletion((DivInstrument*)ins);
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}
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}
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void DivPlatformSAA1099::setPAL(bool pal) {
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if (pal) {
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rate=250000;
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} else {
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rate=250000;
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}
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}
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int DivPlatformSAA1099::init(DivEngine* p, int channels, int sugRate, bool pal) {
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parent=p;
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skipRegisterWrites=false;
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for (int i=0; i<3; i++) {
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isMuted[i]=false;
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}
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setPAL(pal);
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ayBufLen=65536;
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for (int i=0; i<3; i++) ayBuf[i]=new short[ayBufLen];
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reset();
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return 3;
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}
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void DivPlatformSAA1099::quit() {
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for (int i=0; i<3; i++) delete[] ayBuf[i];
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}
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