furnace/src/engine/platform/ay8930.cpp

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/**
* Furnace Tracker - multi-system chiptune tracker
* Copyright (C) 2021-2022 tildearrow and contributors
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
*/
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#include "ay8930.h"
#include "../engine.h"
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#include "../../ta-log.h"
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#include "sound/ay8910.h"
#include <string.h>
#include <math.h>
#define rWrite(a,v) if (!skipRegisterWrites) {pendingWrites[a]=v;}
#define immWrite2(a,v) if (!skipRegisterWrites) {writes.emplace(a,v); if (dumpWrites) {addWrite(a,v);} }
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#define CHIP_DIVIDER (clockSel?8:4)
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const char* regCheatSheetAY8930[]={
"FreqL_A", "00",
"FreqH_A", "01",
"FreqL_B", "02",
"FreqH_B", "03",
"FreqL_C", "04",
"FreqH_C", "05",
"FreqNoise", "06",
"Enable", "07",
"Volume_A", "08",
"Volume_B", "09",
"Volume_C", "0A",
"FreqL_EnvA", "0B",
"FreqH_EnvA", "0C",
"Control_EnvA", "0D",
"PortA", "0E",
"PortB", "0F",
"FreqL_EnvB", "10",
"FreqH_EnvB", "11",
"FreqL_EnvC", "12",
"FreqH_EnvC", "13",
"Control_EnvB", "14",
"Control_EnvC", "15",
"Duty_A", "16",
"Duty_B", "17",
"Duty_C", "18",
"NoiseAND", "19",
"NoiseOR", "1A",
"TEST", "1F",
NULL
};
void DivPlatformAY8930::immWrite(unsigned char a, unsigned char v) {
if ((int)bank!=(a>>4)) {
bank=a>>4;
immWrite2(0x0d, 0xa0|(bank<<4)|chan[0].envelope.mode);
}
if (a==0x0d) {
immWrite2(0x0d,0xa0|(bank<<4)|(v&15));
} else {
immWrite2(a&15,v);
}
}
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const char** DivPlatformAY8930::getRegisterSheet() {
return regCheatSheetAY8930;
}
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const char* DivPlatformAY8930::getEffectName(unsigned char effect) {
switch (effect) {
case 0x12:
return "12xx: Set duty cycle (0 to 8)";
break;
case 0x20:
return "20xx: Set channel mode (bit 0: square; bit 1: noise; bit 2: envelope)";
break;
case 0x21:
return "21xx: Set noise frequency (0 to 1F)";
break;
case 0x22:
return "22xy: Set envelope mode (x: shape, y: enable for this channel)";
break;
case 0x23:
return "23xx: Set envelope period low byte";
break;
case 0x24:
return "24xx: Set envelope period high byte";
break;
case 0x25:
return "25xx: Envelope slide up";
break;
case 0x26:
return "26xx: Envelope slide down";
break;
case 0x27:
return "27xx: Set noise AND mask";
break;
case 0x28:
return "28xx: Set noise OR mask";
break;
case 0x29:
return "29xy: Set auto-envelope (x: numerator; y: denominator)";
break;
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case 0x2d:
return "2Dxx: NOT TO BE EMPLOYED BY THE COMPOSER";
break;
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case 0x2e:
return "2Exx: Write to I/O port A";
break;
case 0x2f:
return "2Fxx: Write to I/O port B";
break;
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}
return NULL;
}
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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();
ay->address_w(w.addr);
ay->data_w(w.val);
if (w.addr!=0x0d && (regPool[0x0d]&0xf0)==0xb0) {
regPool[(w.addr&0x0f)|0x10]=w.val;
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} else {
regPool[w.addr&0x0f]=w.val;
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}
writes.pop();
}
ay->sound_stream_update(ayBuf,len);
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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];
}
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}
for (int ch=0; ch<3; ch++) {
for (size_t i=0; i<len; i++) {
oscBuf[ch]->data[oscBuf[ch]->needle++]=ayBuf[ch][i];
}
}
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}
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void DivPlatformAY8930::updateOutSel(bool immediate) {
if (immediate) {
immWrite(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)|
((!ioPortA)<<6)|
((!ioPortB)<<7)));
} else {
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)|
((!ioPortA)<<6)|
((!ioPortB)<<7)));
}
}
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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(bool sysTick) {
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// PSG
for (int i=0; i<3; i++) {
chan[i].std.next();
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if (chan[i].std.vol.had) {
chan[i].outVol=MIN(31,chan[i].std.vol.val)-(31-(chan[i].vol&31));
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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));
}
}
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if (chan[i].std.arp.had) {
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if (!chan[i].inPorta) {
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if (chan[i].std.arp.mode) {
chan[i].baseFreq=NOTE_PERIODIC(chan[i].std.arp.val);
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} else {
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chan[i].baseFreq=NOTE_PERIODIC(chan[i].note+chan[i].std.arp.val);
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}
}
chan[i].freqChanged=true;
} else {
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if (chan[i].std.arp.mode && chan[i].std.arp.finished) {
chan[i].baseFreq=NOTE_PERIODIC(chan[i].note);
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chan[i].freqChanged=true;
}
}
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if (chan[i].std.duty.had) {
rWrite(0x06,chan[i].std.duty.val);
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}
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if (chan[i].std.wave.had) {
chan[i].psgMode=(chan[i].std.wave.val+1)&7;
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if (isMuted[i]) {
rWrite(0x08+i,0);
} else {
rWrite(0x08+i,(chan[i].outVol&31)|((chan[i].psgMode&4)<<3));
}
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}
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if (chan[i].std.pitch.had) {
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if (chan[i].std.pitch.mode) {
chan[i].pitch2+=chan[i].std.pitch.val;
CLAMP_VAR(chan[i].pitch2,-32768,32767);
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} else {
chan[i].pitch2=chan[i].std.pitch.val;
}
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chan[i].freqChanged=true;
}
if (chan[i].std.phaseReset.had) {
if (chan[i].std.phaseReset.val==1) {
oldWrites[0x08+i]=-1;
oldWrites[regMode[i]]=-1;
}
}
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if (chan[i].std.ex1.had) { // duty
rWrite(0x16+i,chan[i].std.ex1.val);
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}
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if (chan[i].std.ex2.had) {
chan[i].envelope.mode=chan[i].std.ex2.val;
rWrite(regMode[i],chan[i].envelope.mode);
}
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if (chan[i].std.ex3.had) {
chan[i].autoEnvNum=chan[i].std.ex3.val;
chan[i].freqChanged=true;
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if (!chan[i].std.alg.will) chan[i].autoEnvDen=1;
}
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if (chan[i].std.alg.had) {
chan[i].autoEnvDen=chan[i].std.alg.val;
chan[i].freqChanged=true;
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if (!chan[i].std.ex3.will) chan[i].autoEnvNum=1;
}
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if (chan[i].std.fb.had) {
ayNoiseAnd=chan[i].std.fb.val;
immWrite(0x19,ayNoiseAnd);
}
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if (chan[i].std.fms.had) {
ayNoiseOr=chan[i].std.fms.val;
immWrite(0x1a,ayNoiseOr);
}
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if (chan[i].freqChanged || chan[i].keyOn || chan[i].keyOff) {
chan[i].freq=parent->calcFreq(chan[i].baseFreq,chan[i].pitch,true,0,chan[i].pitch2,chipClock,CHIP_DIVIDER);
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if (chan[i].freq>65535) chan[i].freq=65535;
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if (chan[i].keyOn) {
if (chan[i].insChanged) {
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if (!chan[i].std.ex1.will) immWrite(0x16+i,chan[i].duty);
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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) {
chan[i].envelope.period=(chan[i].freq*chan[i].autoEnvDen/chan[i].autoEnvNum)>>4;
immWrite(regPeriodL[i],chan[i].envelope.period);
immWrite(regPeriodH[i],chan[i].envelope.period>>8);
}
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chan[i].freqChanged=false;
}
if (chan[i].envelope.slide!=0) {
chan[i].envelope.slideLow+=chan[i].envelope.slide;
while (chan[i].envelope.slideLow>7) {
chan[i].envelope.slideLow-=8;
if (chan[i].envelope.period<0xffff) {
chan[i].envelope.period++;
immWrite(regPeriodL[i],chan[i].envelope.period);
immWrite(regPeriodH[i],chan[i].envelope.period>>8);
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}
}
while (chan[i].envelope.slideLow<-7) {
chan[i].envelope.slideLow+=8;
if (chan[i].envelope.period>0) {
chan[i].envelope.period--;
immWrite(regPeriodL[i],chan[i].envelope.period);
immWrite(regPeriodH[i],chan[i].envelope.period>>8);
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}
}
}
}
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updateOutSel();
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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,DIV_INS_AY8930);
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;
}
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chan[c.chan].active=true;
chan[c.chan].keyOn=true;
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chan[c.chan].macroInit(ins);
if (!parent->song.brokenOutVol && !chan[c.chan].std.vol.will) {
chan[c.chan].outVol=chan[c.chan].vol;
}
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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;
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chan[c.chan].macroInit(NULL);
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break;
case DIV_CMD_NOTE_OFF_ENV:
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
break;
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case DIV_CMD_VOLUME: {
chan[c.chan].vol=c.value;
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if (!chan[c.chan].std.vol.has) {
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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) {
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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);
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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);
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chan[c.chan].freqChanged=true;
break;
}
case DIV_CMD_STD_NOISE_MODE:
if (c.value<0x10) {
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chan[c.chan].psgMode=(c.value+1)&7;
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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));
}
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} else {
chan[c.chan].duty=c.value&15;
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immWrite(0x16+c.chan,chan[c.chan].duty);
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}
break;
case DIV_CMD_STD_NOISE_FREQ:
rWrite(0x06,c.value);
break;
case DIV_CMD_AY_ENVELOPE_SET:
chan[c.chan].envelope.mode=c.value>>4;
rWrite(regMode[c.chan],chan[c.chan].envelope.mode);
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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:
chan[c.chan].envelope.period&=0xff00;
chan[c.chan].envelope.period|=c.value;
immWrite(regPeriodL[c.chan],chan[c.chan].envelope.period);
immWrite(regPeriodH[c.chan],chan[c.chan].envelope.period>>8);
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break;
case DIV_CMD_AY_ENVELOPE_HIGH:
chan[c.chan].envelope.period&=0xff;
chan[c.chan].envelope.period|=c.value<<8;
immWrite(regPeriodL[c.chan],chan[c.chan].envelope.period);
immWrite(regPeriodH[c.chan],chan[c.chan].envelope.period>>8);
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break;
case DIV_CMD_AY_ENVELOPE_SLIDE:
chan[c.chan].envelope.slide=c.value;
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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;
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case DIV_CMD_AY_IO_WRITE:
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if (c.value==255) {
immWrite(0x1f,c.value2);
break;
}
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if (c.value) { // port B
ioPortB=true;
portBVal=c.value2;
logI("AY I/O port B write: %x",portBVal);
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} else { // port A
ioPortA=true;
portAVal=c.value2;
logI("AY I/O port A write: %x",portAVal);
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}
updateOutSel(true);
immWrite(14+(c.value?1:0),(c.value?portBVal:portAVal));
break;
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case DIV_ALWAYS_SET_VOLUME:
return 0;
break;
case DIV_CMD_GET_VOLMAX:
return 31;
break;
case DIV_CMD_PRE_PORTA:
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if (chan[c.chan].active && c.value2) {
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if (parent->song.resetMacroOnPorta) chan[c.chan].macroInit(parent->getIns(chan[c.chan].ins,DIV_INS_AY8930));
}
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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],chan[i].envelope.period);
immWrite(regPeriodH[i],chan[i].envelope.period>>8);
immWrite(regMode[i],chan[i].envelope.mode);
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}
}
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void* DivPlatformAY8930::getChanState(int ch) {
return &chan[ch];
}
DivDispatchOscBuffer* DivPlatformAY8930::getOscBuffer(int ch) {
return oscBuf[ch];
}
unsigned char* DivPlatformAY8930::getRegisterPool() {
return regPool;
}
int DivPlatformAY8930::getRegisterPoolSize() {
return 32;
}
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void DivPlatformAY8930::reset() {
while (!writes.empty()) writes.pop();
ay->device_reset();
memset(regPool,0,32);
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for (int i=0; i<3; i++) {
chan[i]=DivPlatformAY8930::Channel();
chan[i].std.setEngine(parent);
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chan[i].vol=31;
chan[i].envelope.period=0;
chan[i].envelope.mode=0;
chan[i].envelope.slide=0;
chan[i].envelope.slideLow=0;
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}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
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for (int i=0; i<32; i++) {
oldWrites[i]=-1;
pendingWrites[i]=-1;
}
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ayNoiseAnd=2;
ayNoiseOr=0;
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delay=0;
extMode=false;
bank=false;
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ioPortA=false;
ioPortB=false;
portAVal=0;
portBVal=0;
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immWrite(0x0d,0xa0);
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immWrite(0x19,2); // and mask
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immWrite(0x1a,0x00); // or mask
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}
bool DivPlatformAY8930::isStereo() {
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return true;
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}
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);
}
}
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void DivPlatformAY8930::poke(unsigned int addr, unsigned short val) {
immWrite(addr,val);
}
void DivPlatformAY8930::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
}
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void DivPlatformAY8930::setFlags(unsigned int flags) {
clockSel=(flags>>7)&1;
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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;
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case 9:
chipClock=COLOR_PAL/4.0;
break;
case 10:
chipClock=2097152;
break;
case 11:
chipClock=COLOR_NTSC;
break;
case 12:
chipClock=3600000;
break;
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default:
chipClock=COLOR_NTSC/2.0;
break;
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}
rate=chipClock/4;
for (int i=0; i<3; i++) {
oscBuf[i]->rate=rate;
}
stereo=(flags>>6)&1;
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}
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int DivPlatformAY8930::init(DivEngine* p, int channels, int sugRate, unsigned int flags) {
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parent=p;
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dumpWrites=false;
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skipRegisterWrites=false;
for (int i=0; i<3; i++) {
isMuted[i]=false;
oscBuf[i]=new DivDispatchOscBuffer;
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}
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setFlags(flags);
ay=new ay8930_device(rate,clockSel);
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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 oscBuf[i];
delete[] ayBuf[i];
}
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delete ay;
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}