312 lines
7.2 KiB
C++
312 lines
7.2 KiB
C++
![]() |
/**
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* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2022 tildearrow and contributors
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "pet.h"
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#include "../engine.h"
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#include <math.h>
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#define rWrite(a,v) {regPool[(a)]=(v)&0xff; if((a)==10) {chan.sreg=(v); chan.cnt=2;}}
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#define CHIP_DIVIDER 16
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#define SAMP_DIVIDER 4
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const char* regCheatSheet6522[]={
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"T2L", "08",
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"SR", "0A",
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"ACR", "0B",
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NULL
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};
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const char** DivPlatformPET::getRegisterSheet() {
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return regCheatSheet6522;
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}
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const char* DivPlatformPET::getEffectName(unsigned char effect) {
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switch (effect) {
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case 0x10:
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return "10xx: Change waveform";
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break;
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}
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return NULL;
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}
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void DivPlatformPET::acquire(short* bufL, short* bufR, size_t start, size_t len) {
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// high-level emulation of 6522 shift register for now
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int t2=regPool[8]*2+4;
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if (((regPool[11]>>2)&7)==4) {
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for (size_t h=start; h<start+len; h++) {
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int cycs=SAMP_DIVIDER;
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while (cycs>0) {
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int adv=MIN(cycs,chan.cnt);
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chan.cnt-=adv;
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cycs-=adv;
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if (chan.cnt==0) {
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chan.out=(chan.sreg&1)*32767;
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chan.sreg=(chan.sreg>>1)|((chan.sreg&1)<<7);
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chan.cnt=t2;
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}
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}
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bufL[h]=chan.out;
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bufR[h]=chan.out;
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}
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} else {
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chan.out=0;
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for (size_t h=start; h<start+len; h++) {
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bufL[h]=0;
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bufR[h]=0;
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}
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}
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}
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void DivPlatformPET::updateWave() {
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DivWavetable* wt=parent->getWave(chan.wave);
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if (wt->max<1 || wt->len<1) {
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rWrite(10,0);
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} else {
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unsigned char sr=0;
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for (int i=0; i<8; i++) {
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sr=(sr<<1)|((wt->data[i*wt->len/8]*2)/(wt->max+1));
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}
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rWrite(10,sr);
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}
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}
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void DivPlatformPET::writeOutVol() {
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if (chan.active && !isMuted && chan.outVol>0) {
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if (regPool[11]!=16) {
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rWrite(11,16);
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rWrite(10,regPool[10]);
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}
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} else {
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rWrite(11,0);
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}
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}
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void DivPlatformPET::tick() {
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chan.std.next();
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if (chan.std.hadVol) {
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chan.outVol=chan.std.vol&chan.vol;
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writeOutVol();
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}
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if (chan.std.hadArp) {
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if (!chan.inPorta) {
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if (chan.std.arpMode) {
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chan.baseFreq=NOTE_PERIODIC(chan.std.arp);
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} else {
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chan.baseFreq=NOTE_PERIODIC(chan.note+chan.std.arp);
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}
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}
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chan.freqChanged=true;
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} else {
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if (chan.std.arpMode && chan.std.finishedArp) {
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chan.baseFreq=NOTE_PERIODIC(chan.note);
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chan.freqChanged=true;
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}
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}
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if (chan.std.hadWave) {
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if (chan.wave!=chan.std.wave) {
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chan.wave=chan.std.wave;
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updateWave();
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}
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}
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if (chan.freqChanged || chan.keyOn || chan.keyOff) {
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chan.freq=parent->calcFreq(chan.baseFreq,chan.pitch,true);
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if (chan.freq>257) chan.freq=257;
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if (chan.freq<2) chan.freq=2;
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rWrite(8,chan.freq-2);
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if (chan.keyOn) {
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if (!chan.std.willVol) {
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chan.outVol=chan.vol;
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writeOutVol();
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}
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if (chan.wave<0) {
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chan.wave=0;
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updateWave();
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}
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chan.keyOn=false;
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}
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if (chan.keyOff) {
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rWrite(11,0);
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chan.keyOff=false;
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}
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chan.freqChanged=false;
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}
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}
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int DivPlatformPET::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.ins);
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if (c.value!=DIV_NOTE_NULL) {
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chan.baseFreq=NOTE_PERIODIC(c.value);
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chan.freqChanged=true;
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chan.note=c.value;
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}
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chan.active=true;
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chan.keyOn=true;
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chan.std.init(ins);
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break;
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}
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case DIV_CMD_NOTE_OFF:
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chan.active=false;
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chan.keyOff=true;
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chan.std.init(NULL);
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break;
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case DIV_CMD_NOTE_OFF_ENV:
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case DIV_CMD_ENV_RELEASE:
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chan.std.release();
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break;
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case DIV_CMD_INSTRUMENT:
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if (chan.ins!=c.value || c.value2==1) {
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chan.ins=c.value;
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}
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break;
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case DIV_CMD_VOLUME:
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if (chan.vol!=c.value) {
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chan.vol=c.value;
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if (!chan.std.hadVol) {
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chan.outVol=chan.vol;
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writeOutVol();
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}
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}
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break;
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case DIV_CMD_GET_VOLUME:
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return chan.vol;
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break;
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case DIV_CMD_PITCH:
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chan.pitch=c.value;
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chan.freqChanged=true;
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break;
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case DIV_CMD_WAVE:
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chan.wave=c.value;
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updateWave();
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chan.keyOn=true;
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break;
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case DIV_CMD_NOTE_PORTA: {
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int destFreq=NOTE_PERIODIC(c.value2);
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bool return2=false;
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if (destFreq>chan.baseFreq) {
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chan.baseFreq+=c.value;
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if (chan.baseFreq>=destFreq) {
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chan.baseFreq=destFreq;
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return2=true;
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}
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} else {
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chan.baseFreq-=c.value;
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if (chan.baseFreq<=destFreq) {
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chan.baseFreq=destFreq;
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return2=true;
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}
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}
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chan.freqChanged=true;
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if (return2) {
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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.baseFreq=NOTE_PERIODIC(c.value+((chan.std.willArp && !chan.std.arpMode)?(chan.std.arp):(0)));
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chan.freqChanged=true;
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chan.note=c.value;
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break;
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case DIV_CMD_PRE_PORTA:
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if (chan.active && c.value2) {
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if (parent->song.resetMacroOnPorta) chan.std.init(parent->getIns(chan.ins));
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}
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chan.inPorta=c.value;
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break;
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case DIV_CMD_GET_VOLMAX:
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return 1;
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break;
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case DIV_ALWAYS_SET_VOLUME:
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return 1;
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break;
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default:
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break;
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}
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return 1;
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}
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void DivPlatformPET::muteChannel(int ch, bool mute) {
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isMuted=mute;
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writeOutVol();
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}
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void DivPlatformPET::forceIns() {
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chan.insChanged=true;
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chan.freqChanged=true;
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updateWave();
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writeOutVol();
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}
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void* DivPlatformPET::getChanState(int ch) {
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return &chan;
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}
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unsigned char* DivPlatformPET::getRegisterPool() {
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return regPool;
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}
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int DivPlatformPET::getRegisterPoolSize() {
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return 16;
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}
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void DivPlatformPET::reset() {
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memset(regPool,0,16);
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chan=Channel();
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chan.vol=1;
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}
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bool DivPlatformPET::isStereo() {
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return false;
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}
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void DivPlatformPET::notifyWaveChange(int wave) {
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if (chan.wave==wave) {
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updateWave();
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}
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}
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void DivPlatformPET::notifyInsDeletion(void* ins) {
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chan.std.notifyInsDeletion((DivInstrument*)ins);
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}
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void DivPlatformPET::poke(unsigned int addr, unsigned short val) {
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rWrite(addr,val);
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}
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void DivPlatformPET::poke(std::vector<DivRegWrite>& wlist) {
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for (DivRegWrite& i: wlist) rWrite(i.addr,i.val);
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}
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int DivPlatformPET::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;
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chipClock=1000000;
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rate=chipClock/SAMP_DIVIDER; // = 250000kHz
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isMuted=false;
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reset();
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return 1;
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}
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DivPlatformPET::~DivPlatformPET() {
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}
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