furnace/src/engine/pattern.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 "engine.h"
static DivPattern emptyPat;
DivPattern::DivPattern() {
memset(data,-1,256*32*sizeof(short));
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for (int i=0; i<256; i++) {
data[i][0]=0;
data[i][1]=0;
}
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}
DivPattern* DivChannelData::getPattern(int index, bool create) {
if (data[index]==NULL) {
if (create) {
data[index]=new DivPattern;
} else {
return &emptyPat;
}
}
return data[index];
}
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void DivChannelData::wipePatterns() {
for (int i=0; i<256; i++) {
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if (data[i]!=NULL) {
delete data[i];
data[i]=NULL;
}
}
}
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void DivPattern::copyOn(DivPattern *dest) {
dest->name=name;
memcpy(dest->data,data,sizeof(data));
}
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SafeReader* DivPattern::compile(int len, int fxRows) {
SafeWriter w;
w.init();
short lastNote, lastOctave, lastInstr, lastVolume, lastEffect[8], lastEffectVal[8];
unsigned char rows=0;
lastNote=0;
lastOctave=0;
lastInstr=-1;
lastVolume=-1;
memset(lastEffect,-1,8*sizeof(short));
memset(lastEffectVal,-1,8*sizeof(short));
for (int i=0; i<len; i++) {
unsigned char mask=0;
if (data[i][0]!=-1) {
lastNote=data[i][0];
lastOctave=data[i][1];
mask|=128;
}
if (data[i][2]!=-1 && data[i][2]!=lastInstr) {
lastInstr=data[i][2];
mask|=32;
}
if (data[i][3]!=-1 && data[i][3]!=lastVolume) {
lastVolume=data[i][3];
mask|=64;
}
for (int j=0; j<fxRows; j++) {
if (data[i][4+(j<<1)]!=-1) {
lastEffect[j]=data[i][4+(j<<1)];
lastEffectVal[j]=data[i][5+(j<<1)];
mask=(mask&0xf8)|j;
}
}
if (!mask) {
rows++;
continue;
}
if (rows!=0) {
w.writeC(rows);
}
rows=1;
w.writeC(mask);
if (mask&128) {
if (lastNote==100) {
w.writeC(-128);
} else {
w.writeC(lastNote+(lastOctave*12));
}
}
if (mask&64) {
w.writeC(lastVolume);
}
if (mask&32) {
w.writeC(lastInstr);
}
for (int j=0; j<(mask&7); j++) {
w.writeC(lastEffect[j]);
if (lastEffectVal[j]==-1) {
w.writeC(0);
} else {
w.writeC(lastEffectVal[j]);
}
}
}
w.writeC(rows);
w.writeC(0);
return w.toReader();
}
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DivChannelData::DivChannelData():
effectCols(1) {
memset(data,0,256*sizeof(void*));
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}