furnace/src/engine/chipUtils.h

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/**
* Furnace Tracker - multi-system chiptune tracker
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* Copyright (C) 2021-2023 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.
*/
#ifndef _CHIP_UTILS_H
#define _CHIP_UTILS_H
#include "macroInt.h"
// custom clock limits
#define MIN_CUSTOM_CLOCK 100000
#define MAX_CUSTOM_CLOCK 40000000
// common shared channel struct
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template<typename T> struct SharedChannel {
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int freq, baseFreq, baseNoteOverride, pitch, pitch2, arpOff;
int ins, note;
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bool active, insChanged, freqChanged, fixedArp, keyOn, keyOff, portaPause, inPorta;
T vol, outVol;
DivMacroInt std;
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void handleArp(int offset=0) {
if (std.arp.had) {
if (std.arp.val<0) {
if (!(std.arp.val&0x40000000)) {
baseNoteOverride=(std.arp.val|0x40000000)+offset;
fixedArp=true;
} else {
arpOff=std.arp.val;
fixedArp=false;
}
} else {
if (std.arp.val&0x40000000) {
baseNoteOverride=(std.arp.val&(~0x40000000))+offset;
fixedArp=true;
} else {
arpOff=std.arp.val;
fixedArp=false;
}
}
freqChanged=true;
}
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}
void macroInit(DivInstrument* which) {
std.init(which);
pitch2=0;
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arpOff=0;
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baseNoteOverride=0;
fixedArp=false;
}
SharedChannel(T initVol):
freq(0),
baseFreq(0),
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baseNoteOverride(0),
pitch(0),
pitch2(0),
arpOff(0),
ins(-1),
note(0),
active(false),
insChanged(true),
freqChanged(false),
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fixedArp(false),
keyOn(false),
keyOff(false),
portaPause(false),
inPorta(false),
vol(initVol),
outVol(initVol),
std() {}
};
#endif