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https://github.com/tildearrow/furnace.git
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c5786b61fb
experimental feature! proceed with caution. if you experience song corruption or crashes, report issue immediately! files with multiple songs will be readable in older versions of Furnace, but only the first song will be read in those versions. issue #199
135 lines
3.1 KiB
C++
135 lines
3.1 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 "engine.h"
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static DivPattern emptyPat;
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DivPattern::DivPattern() {
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memset(data,-1,256*32*sizeof(short));
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for (int i=0; i<256; i++) {
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data[i][0]=0;
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data[i][1]=0;
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}
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}
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DivPattern* DivChannelData::getPattern(int index, bool create) {
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if (data[index]==NULL) {
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if (create) {
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data[index]=new DivPattern;
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} else {
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return &emptyPat;
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}
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}
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return data[index];
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}
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void DivChannelData::wipePatterns() {
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for (int i=0; i<256; i++) {
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if (data[i]!=NULL) {
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delete data[i];
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data[i]=NULL;
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}
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}
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}
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void DivPattern::copyOn(DivPattern* dest) {
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dest->name=name;
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memcpy(dest->data,data,sizeof(data));
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}
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SafeReader* DivPattern::compile(int len, int fxRows) {
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SafeWriter w;
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w.init();
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short lastNote, lastOctave, lastInstr, lastVolume, lastEffect[8], lastEffectVal[8];
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unsigned char rows=0;
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lastNote=0;
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lastOctave=0;
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lastInstr=-1;
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lastVolume=-1;
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memset(lastEffect,-1,8*sizeof(short));
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memset(lastEffectVal,-1,8*sizeof(short));
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for (int i=0; i<len; i++) {
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unsigned char mask=0;
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if (data[i][0]!=-1) {
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lastNote=data[i][0];
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lastOctave=data[i][1];
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mask|=128;
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}
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if (data[i][2]!=-1 && data[i][2]!=lastInstr) {
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lastInstr=data[i][2];
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mask|=32;
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}
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if (data[i][3]!=-1 && data[i][3]!=lastVolume) {
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lastVolume=data[i][3];
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mask|=64;
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}
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for (int j=0; j<fxRows; j++) {
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if (data[i][4+(j<<1)]!=-1) {
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lastEffect[j]=data[i][4+(j<<1)];
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lastEffectVal[j]=data[i][5+(j<<1)];
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mask=(mask&0xf8)|j;
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}
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}
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if (!mask) {
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rows++;
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continue;
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}
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if (rows!=0) {
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w.writeC(rows);
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}
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rows=1;
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w.writeC(mask);
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if (mask&128) {
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if (lastNote==100) {
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w.writeC(-128);
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} else {
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w.writeC(lastNote+(lastOctave*12));
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}
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}
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if (mask&64) {
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w.writeC(lastVolume);
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}
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if (mask&32) {
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w.writeC(lastInstr);
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}
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for (int j=0; j<(mask&7); j++) {
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w.writeC(lastEffect[j]);
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if (lastEffectVal[j]==-1) {
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w.writeC(0);
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} else {
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w.writeC(lastEffectVal[j]);
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}
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}
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}
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w.writeC(rows);
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w.writeC(0);
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return w.toReader();
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}
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DivChannelData::DivChannelData():
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effectCols(1) {
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memset(data,0,256*sizeof(void*));
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}
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