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furnace/src/engine/platform/ay.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.
*/
#include "ay.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(regRemap(a),v); if (dumpWrites) {addWrite(regRemap(a),v);} }
#define CHIP_DIVIDER 8
const char* regCheatSheetAY[]={
"FreqL_A", "0",
"FreqH_A", "1",
"FreqL_B", "2",
"FreqH_B", "3",
"FreqL_C", "4",
"FreqH_C", "5",
"FreqNoise", "6",
"Enable", "7",
"Volume_A", "8",
"Volume_B", "9",
"Volume_C", "A",
"FreqL_Env", "B",
"FreqH_Env", "C",
"Control_Env", "D",
"PortA", "E",
"PortB", "F",
NULL
};
const char* regCheatSheetAY8914[]={
"FreqL_A", "0",
"FreqL_B", "1",
"FreqL_C", "2",
"FreqL_Env", "3",
"FreqH_A", "4",
"FreqH_B", "5",
"FreqH_C", "6",
"FreqH_Env", "7",
"Enable", "8",
"FreqNoise", "9",
"Control_Env", "A",
"Volume_A", "B",
"Volume_B", "C",
"Volume_C", "D",
"PortA", "E",
"PortB", "F",
NULL
};
const char** DivPlatformAY8910::getRegisterSheet() {
return intellivision?regCheatSheetAY8914:regCheatSheetAY;
}
const char* DivPlatformAY8910::getEffectName(unsigned char effect) {
switch (effect) {
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 0x29:
return "29xy: Set auto-envelope (x: numerator; y: denominator)";
break;
}
return NULL;
}
void DivPlatformAY8910::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 (intellivision) {
ay8914_device* ay8914=(ay8914_device*)ay;
ay8914->write(w.addr,w.val);
} else {
ay->address_w(w.addr);
ay->data_w(w.val);
}
regPool[w.addr&0x0f]=w.val;
writes.pop();
}
ay->sound_stream_update(ayBuf,len);
if (sunsoft) {
for (size_t i=0; i<len; i++) {
bufL[i+start]=ayBuf[0][i];
bufR[i+start]=bufL[i+start];
}
} else 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];
}
}
}
void DivPlatformAY8910::tick() {
// PSG
for (int i=0; i<3; i++) {
chan[i].std.next();
if (chan[i].std.hadVol) {
chan[i].outVol=MIN(15,chan[i].std.vol)-(15-(chan[i].vol&15));
if (chan[i].outVol<0) chan[i].outVol=0;
if (isMuted[i]) {
rWrite(0x08+i,0);
} else if (intellivision && (chan[i].psgMode&4)) {
rWrite(0x08+i,(chan[i].outVol&0xc)<<2);
} else {
rWrite(0x08+i,(chan[i].outVol&15)|((chan[i].psgMode&4)<<2));
}
}
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(0x06,31-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 if (intellivision && (chan[i].psgMode&4)) {
rWrite(0x08+i,(chan[i].outVol&0xc)<<2);
} else {
rWrite(0x08+i,(chan[i].outVol&15)|((chan[i].psgMode&4)<<2));
}
}
if (chan[i].std.hadEx2) {
ayEnvMode=chan[i].std.ex2;
rWrite(0x0d,ayEnvMode);
}
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) {
//rWrite(16+i*5+1,((chan[i].duty&3)<<6)|(63-(ins->gb.soundLen&63)));
//rWrite(16+i*5+2,((chan[i].vol<<4))|(ins->gb.envLen&7)|((ins->gb.envDir&1)<<3));
}
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=(chan[i].freq*chan[i].autoEnvDen/chan[i].autoEnvNum)>>4;
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
}
chan[i].freqChanged=false;
}
}
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)));
if (ayEnvSlide!=0) {
ayEnvSlideLow+=ayEnvSlide;
while (ayEnvSlideLow>7) {
ayEnvSlideLow-=8;
if (ayEnvPeriod<0xffff) {
ayEnvPeriod++;
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
}
}
while (ayEnvSlideLow<-7) {
ayEnvSlideLow+=8;
if (ayEnvPeriod>0) {
ayEnvPeriod--;
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
}
}
}
for (int i=0; i<16; i++) {
if (pendingWrites[i]!=oldWrites[i]) {
immWrite(i,pendingWrites[i]&0xff);
oldWrites[i]=pendingWrites[i];
}
}
}
int DivPlatformAY8910::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 if (intellivision && (chan[c.chan].psgMode&4)) {
rWrite(0x08+c.chan,(chan[c.chan].vol&0xc)<<2);
} else {
rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
}
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_NOTE_OFF_ENV:
case DIV_CMD_ENV_RELEASE:
chan[c.chan].std.release();
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) {
if (intellivision && (chan[c.chan].psgMode&4)) {
rWrite(0x08+c.chan,(chan[c.chan].vol&0xc)<<2);
} else {
rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
}
}
}
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<16) {
chan[c.chan].psgMode=(c.value+1)&7;
if (isMuted[c.chan]) {
rWrite(0x08+c.chan,0);
} else if (chan[c.chan].active) {
if (intellivision && (chan[c.chan].psgMode&4)) {
rWrite(0x08+c.chan,(chan[c.chan].outVol&0xc)<<2);
} else {
rWrite(0x08+c.chan,(chan[c.chan].outVol&15)|((chan[c.chan].psgMode&4)<<2));
}
}
}
break;
case DIV_CMD_STD_NOISE_FREQ:
rWrite(0x06,31-c.value);
break;
case DIV_CMD_AY_ENVELOPE_SET:
ayEnvMode=c.value>>4;
rWrite(0x0d,ayEnvMode);
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 if (intellivision && (chan[c.chan].psgMode&4)) {
rWrite(0x08+c.chan,(chan[c.chan].vol&0xc)<<2);
} else {
rWrite(0x08+c.chan,(chan[c.chan].vol&15)|((chan[c.chan].psgMode&4)<<2));
}
break;
case DIV_CMD_AY_ENVELOPE_LOW:
ayEnvPeriod&=0xff00;
ayEnvPeriod|=c.value;
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
break;
case DIV_CMD_AY_ENVELOPE_HIGH:
ayEnvPeriod&=0xff;
ayEnvPeriod|=c.value<<8;
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
break;
case DIV_CMD_AY_ENVELOPE_SLIDE:
ayEnvSlide=c.value;
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 15;
break;
case DIV_CMD_PRE_PORTA:
if (chan[c.chan].active && c.value2) {
if (parent->song.resetMacroOnPorta) 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 DivPlatformAY8910::muteChannel(int ch, bool mute) {
isMuted[ch]=mute;
if (isMuted[ch]) {
rWrite(0x08+ch,0);
} else if (intellivision && (chan[ch].psgMode&4)) {
rWrite(0x08+ch,(chan[ch].vol&0xc)<<2);
} else {
rWrite(0x08+ch,(chan[ch].outVol&15)|((chan[ch].psgMode&4)<<2));
}
}
void DivPlatformAY8910::forceIns() {
for (int i=0; i<3; i++) {
chan[i].insChanged=true;
}
immWrite(0x0b,ayEnvPeriod);
immWrite(0x0c,ayEnvPeriod>>8);
immWrite(0x0d,ayEnvMode);
}
void* DivPlatformAY8910::getChanState(int ch) {
return &chan[ch];
}
unsigned char* DivPlatformAY8910::getRegisterPool() {
return regPool;
}
int DivPlatformAY8910::getRegisterPoolSize() {
return 16;
}
void DivPlatformAY8910::reset() {
while (!writes.empty()) writes.pop();
ay->device_reset();
memset(regPool,0,16);
for (int i=0; i<3; i++) {
chan[i]=DivPlatformAY8910::Channel();
chan[i].vol=0x0f;
}
if (dumpWrites) {
addWrite(0xffffffff,0);
}
for (int i=0; i<16; i++) {
oldWrites[i]=-1;
pendingWrites[i]=-1;
}
lastBusy=60;
dacMode=0;
dacPeriod=0;
dacPos=0;
dacRate=0;
dacSample=-1;
sampleBank=0;
ayEnvPeriod=0;
ayEnvMode=0;
ayEnvSlide=0;
ayEnvSlideLow=0;
delay=0;
extMode=false;
}
bool DivPlatformAY8910::isStereo() {
return true;
}
bool DivPlatformAY8910::keyOffAffectsArp(int ch) {
return true;
}
void DivPlatformAY8910::notifyInsDeletion(void* ins) {
for (int i=0; i<3; i++) {
chan[i].std.notifyInsDeletion((DivInstrument*)ins);
}
}
void DivPlatformAY8910::poke(unsigned int addr, unsigned short val) {
immWrite(addr,val);
}
void DivPlatformAY8910::poke(std::vector<DivRegWrite>& wlist) {
for (DivRegWrite& i: wlist) immWrite(i.addr,i.val);
}
void DivPlatformAY8910::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;
case 9:
chipClock=COLOR_PAL/4.0;
break;
case 10:
chipClock=2097152;
break;
default:
chipClock=COLOR_NTSC/2.0;
break;
}
rate=chipClock/8;
if (ay!=NULL) delete ay;
switch ((flags>>4)&3) {
case 1:
ay=new ym2149_device(rate);
sunsoft=false;
intellivision=false;
break;
case 2:
ay=new sunsoft_5b_sound_device(rate);
sunsoft=true;
intellivision=false;
break;
case 3:
ay=new ay8914_device(rate);
sunsoft=false;
intellivision=true;
break;
default:
ay=new ay8910_device(rate);
sunsoft=false;
intellivision=false;
break;
}
ay->device_start();
stereo=flags>>6;
}
int DivPlatformAY8910::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;
}
ay=NULL;
setFlags(flags);
ayBufLen=65536;
for (int i=0; i<3; i++) ayBuf[i]=new short[ayBufLen];
reset();
return 3;
}
void DivPlatformAY8910::quit() {
for (int i=0; i<3; i++) delete[] ayBuf[i];
if (ay!=NULL) delete ay;
}
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