add AY8930 platform
This commit is contained in:
tildearrow
parent
b26208f2c1
commit
dce06d8ec4
12 changed files with 530 additions and 17 deletions
372
src/engine/platform/ay8930.cpp
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372
src/engine/platform/ay8930.cpp
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#include "ay8930.h"
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#include "../engine.h"
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#include "sound/ay8910.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 7640.0f
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void DivPlatformAY8930::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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if (bank!=(w.addr>>4)) {
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bank=w.addr>>4;
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ay->address_w(0x0d);
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ay->data_w(0xa0|(bank<<4));
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}
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ay->address_w(w.addr&15);
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if (w.addr==0x0d) {
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ay->data_w(0xa0|(bank<<4)|(w.val&15));
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} else {
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ay->data_w(w.val);
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}
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writes.pop();
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}
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ay->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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const unsigned char regPeriodL[3]={
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0x0b, 0x10, 0x12
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};
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const unsigned char regPeriodH[3]={
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0x0c, 0x11, 0x13
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};
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const unsigned char regMode[3]={
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0x0d, 0x14, 0x15
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};
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void DivPlatformAY8930::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-(31-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&31)|((chan[i].psgMode&4)<<3));
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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,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].std.hadEx1) { // duty
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rWrite(0x16+i,chan[i].std.ex1);
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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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if (chan[i].insChanged) {
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if (!chan[i].std.willEx1) immWrite(0x16+i,chan[i].duty);
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chan[i].insChanged=false;
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}
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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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if (ayEnvSlide[i]!=0) {
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ayEnvSlideLow[i]+=ayEnvSlide[i];
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while (ayEnvSlideLow[i]>7) {
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ayEnvSlideLow[i]-=8;
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if (ayEnvPeriod[i]<0xffff) {
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ayEnvPeriod[i]++;
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immWrite(regPeriodL[i],ayEnvPeriod[i]);
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immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
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}
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}
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while (ayEnvSlideLow[i]<-7) {
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ayEnvSlideLow[i]+=8;
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if (ayEnvPeriod[i]>0) {
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ayEnvPeriod[i]--;
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immWrite(regPeriodL[i],ayEnvPeriod[i]);
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immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
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}
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}
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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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for (int i=0; i<32; 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 DivPlatformAY8930::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&31)|((chan[c.chan].psgMode&4)<<3));
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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&31)|((chan[c.chan].psgMode&4)<<3));
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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_MODE:
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if (c.value<0x10) {
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// TODO: channel mode
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} else {
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chan[c.chan].duty=c.value&15;
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immWrite(0x16,chan[c.chan].duty);
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}
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break;
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case DIV_CMD_STD_NOISE_FREQ:
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rWrite(0x06,c.value);
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break;
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case DIV_CMD_AY_ENVELOPE_SET:
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ayEnvMode[c.chan]=c.value>>4;
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rWrite(regMode[c.chan],ayEnvMode[c.chan]);
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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&31)|((chan[c.chan].psgMode&4)<<3));
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}
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break;
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case DIV_CMD_AY_ENVELOPE_LOW:
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ayEnvPeriod[c.chan]&=0xff00;
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ayEnvPeriod[c.chan]|=c.value;
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immWrite(regPeriodL[c.chan],ayEnvPeriod[c.chan]);
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immWrite(regPeriodH[c.chan],ayEnvPeriod[c.chan]>>8);
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break;
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case DIV_CMD_AY_ENVELOPE_HIGH:
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ayEnvPeriod[c.chan]&=0xff;
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ayEnvPeriod[c.chan]|=c.value<<8;
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immWrite(regPeriodL[c.chan],ayEnvPeriod[c.chan]);
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immWrite(regPeriodH[c.chan],ayEnvPeriod[c.chan]>>8);
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break;
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case DIV_CMD_AY_ENVELOPE_SLIDE:
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ayEnvSlide[c.chan]=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 31;
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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 DivPlatformAY8930::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&31)|((chan[ch].psgMode&4)<<3));
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}
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}
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void DivPlatformAY8930::forceIns() {
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for (int i=0; i<3; i++) {
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chan[i].insChanged=true;
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immWrite(regPeriodL[i],ayEnvPeriod[i]);
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immWrite(regPeriodH[i],ayEnvPeriod[i]>>8);
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immWrite(regMode[i],ayEnvMode[i]);
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}
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}
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void DivPlatformAY8930::reset() {
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while (!writes.empty()) writes.pop();
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ay->device_reset();
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for (int i=0; i<3; i++) {
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chan[i]=DivPlatformAY8930::Channel();
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chan[i].vol=31;
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ayEnvPeriod[i]=0;
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ayEnvMode[i]=0;
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ayEnvSlide[i]=0;
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ayEnvSlideLow[i]=0;
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}
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for (int i=0; i<32; 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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delay=0;
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extMode=false;
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bank=false;
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immWrite(0x0d,0xa0);
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}
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bool DivPlatformAY8930::isStereo() {
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return false;
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}
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bool DivPlatformAY8930::keyOffAffectsArp(int ch) {
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return true;
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}
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void DivPlatformAY8930::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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int DivPlatformAY8930::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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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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ay=new ay8930_device(rate);
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ay->device_start();
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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 DivPlatformAY8930::quit() {
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for (int i=0; i<3; i++) delete[] ayBuf[i];
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delete ay;
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}
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67
src/engine/platform/ay8930.h
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67
src/engine/platform/ay8930.h
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@ -0,0 +1,67 @@
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#ifndef _AY8930_H
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#define _AY8930_H
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#include "../dispatch.h"
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#include "../macroInt.h"
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#include <queue>
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#include "sound/ay8910.h"
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class DivPlatformAY8930: public DivDispatch {
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protected:
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struct Channel {
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unsigned char freqH, freqL;
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int freq, baseFreq, pitch;
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unsigned char ins, note, psgMode, duty;
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signed char konCycles;
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bool active, insChanged, freqChanged, keyOn, keyOff, portaPause, inPorta;
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int vol, outVol;
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unsigned char pan;
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DivMacroInt std;
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Channel(): freqH(0), freqL(0), freq(0), baseFreq(0), pitch(0), ins(-1), note(0), psgMode(1), duty(4), active(false), insChanged(true), freqChanged(false), keyOn(false), keyOff(false), portaPause(false), inPorta(false), vol(0), outVol(31), pan(3) {}
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};
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Channel chan[3];
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bool isMuted[3];
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struct QueuedWrite {
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unsigned short addr;
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unsigned char val;
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bool addrOrVal;
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QueuedWrite(unsigned short a, unsigned char v): addr(a), val(v), addrOrVal(false) {}
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};
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std::queue<QueuedWrite> writes;
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ay8930_device* ay;
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unsigned char lastBusy;
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bool dacMode;
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int dacPeriod;
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int dacRate;
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int dacPos;
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int dacSample;
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unsigned char sampleBank;
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bool bank;
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int delay;
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bool extMode;
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short oldWrites[32];
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short pendingWrites[32];
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unsigned char ayEnvMode[3];
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unsigned short ayEnvPeriod[3];
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short ayEnvSlideLow[3];
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short ayEnvSlide[3];
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short* ayBuf[3];
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size_t ayBufLen;
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public:
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void acquire(short* bufL, short* bufR, size_t start, size_t len);
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int dispatch(DivCommand c);
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void reset();
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void forceIns();
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void tick();
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void muteChannel(int ch, bool mute);
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bool isStereo();
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bool keyOffAffectsArp(int ch);
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void notifyInsDeletion(void* ins);
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int init(DivEngine* parent, int channels, int sugRate, bool pal);
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void quit();
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};
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#endif
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