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/* ScummVM - Scumm Interpreter
* Copyright (C) 2006 The ScummVM project
* Based on code by madmoose
*
* 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.
*
* $URL$
* $Id$
*
*/
#include "common/stdafx.h"
#include "sound/mods/protracker.h"
#include "sound/mods/paula.h"
#include "sound/mods/module.h"
#include "sound/audiostream.h"
namespace Modules {
class ProtrackerStream : public ::Audio::Paula {
private:
Module *_module;
int _rate;
int _tick;
int _row;
int _pos;
int _patternDelay;
int _speed;
int _bpm;
// For effect 0xB - Jump To Pattern;
bool _hasJumpToPattern;
int _jumpToPattern;
// For effect 0xD - PatternBreak;
bool _hasPatternBreak;
int _skiprow;
// For effect 0xE6 - Pattern Loop
bool _hasPatternLoop;
int _patternLoopCount;
int _patternLoopRow;
struct {
byte sample;
uint16 period;
double offset;
byte vol;
// For effect 0x3 - Porta to note
uint16 portaToNote;
byte portaToNoteSpeed;
// For effect 0x4 - Vibrato
int vibrato;
byte vibratoPos;
byte vibratoSpeed;
byte vibratoDepth;
} _track[4];
public:
ProtrackerStream(Common::ReadStream *stream, int rate, bool stereo);
private:
void startPlay() { _playing = true; _end = false; }
void interrupt();
void updateRow();
void updateEffects();
};
ProtrackerStream::ProtrackerStream(Common::ReadStream *stream, int rate, bool stereo) :
Paula(stereo, rate, rate/50) {
_module = new Module();
bool result = _module->load(*stream);
assert(result);
_rate = rate;
_tick = _row = _pos = 0;
_hasJumpToPattern = false;
_hasPatternBreak = false;
_hasPatternLoop = false;
_patternDelay = 0;
_patternLoopCount = 0;
_patternLoopRow = 0;
_speed = 6;
_bpm = 125;
for (int t = 0; t < 4; t++) {
_track[t].sample = 0;
_track[t].period = 0;
_track[t].offset = 0.0;
_track[t].vibrato = 0;
}
startPlay();
}
void ProtrackerStream::updateRow() {
for (int track = 0; track < 4; track++) {
_track[track].vibrato = 0;
note_t note =
_module->pattern[_module->songpos[_pos]][_row][track];
int effect = note.effect >> 8;
_track[track].sample = note.sample;
if (_track[track].sample != note.sample) {
_track[track].vibratoPos = 0;
}
if (note.sample) {
_track[track].vol = _module->sample[note.sample - 1].vol;
}
if (note.period) {
if (effect != 3 && effect != 5) {
_track[track].period = note.period;
_track[track].offset = 0.0;
}
}
int exy = note.effect & 0xff;
int ex = (note.effect >> 4) & 0xf;
int ey = note.effect & 0xf;
switch (effect) {
case 0x0:
break;
case 0x1:
break;
case 0x2:
break;
case 0x3:
if (note.period)
_track[track].portaToNote = note.period;
if (exy)
_track[track].portaToNoteSpeed = exy;
break;
case 0x4:
if (ex || ey) {
_track[track].vibratoSpeed = ex;
_track[track].vibratoDepth = ey;
}
break;
case 0x5:
break;
case 0xA:
break;
case 0xB:
_hasJumpToPattern = true;
_jumpToPattern = exy;
break;
case 0xC:
_track[track].vol = exy;
break;
case 0xD:
_hasPatternBreak = true;
_skiprow = ex * 10 + ey;
break;
case 0xE:
switch (ex) {
case 0x6:
if (ey == 0) {
_patternLoopRow = _row;
} else {
_patternLoopCount++;
if (_patternLoopCount <= ey)
_hasPatternLoop = true;
else
_patternLoopCount = 0;
}
break;
case 0x9:
break; // Retrigger note
default:
warning("Unimplemented effect %X\n", note.effect);
}
break;
case 0xF:
if (exy < 0x20) {
_speed = exy;
} else {
_bpm = exy;
setInterruptFreq((int) (((double) _bpm) * 0.4));
}
break;
default:
warning("Unimplemented effect %X\n", note.effect);
}
}
}
void ProtrackerStream::updateEffects() {
static const int16 sinetable[64] = {
0, 24, 49, 74, 97, 120, 141, 161,
180, 197, 212, 224, 235, 244, 250, 253,
255, 253, 250, 244, 235, 224, 212, 197,
180, 161, 141, 120, 97, 74, 49, 24,
0, -24, -49, -74, -97, -120, -141, -161,
-180, -197, -212, -224, -235, -244, -250, -253,
-255, -253, -250, -244, -235, -224, -212, -197,
-180, -161, -141, -120, -97, -74, -49, -24
};
for (int track = 0; track < 4; track++) {
_track[track].vibrato = 0;
note_t note =
_module->pattern[_module->songpos[_pos]][_row][track];
int effect = note.effect >> 8;
int exy = note.effect & 0xff;
int ex = (note.effect >> 4) & 0xf;
int ey = (note.effect) & 0xf;
int vol;
switch (effect) {
case 0x0:
break;
case 0x1:
_track[track].period -= exy;
break;
case 0x2:
_track[track].period += exy;
break;
case 0x3:
if (_track[track].portaToNote && _track[track].portaToNoteSpeed) {
if (_track[track].period < _track[track].portaToNote) {
_track[track].period += _track[track].portaToNoteSpeed;
if (_track[track].period > _track[track].portaToNote)
_track[track].period = _track[track].portaToNote;
} else if (_track[track].period > _track[track].portaToNote) {
_track[track].period -= _track[track].portaToNoteSpeed;
if (_track[track].period < _track[track].portaToNote)
_track[track].period = _track[track].portaToNote;
}
}
break;
case 0x4:
_track[track].vibrato =
(_track[track].vibratoDepth * sinetable[_track[track].vibratoPos]) / 128;
_track[track].vibratoPos += _track[track].vibratoSpeed;
_track[track].vibratoPos %= 64;
break;
case 0x5:
if (_track[track].portaToNote
&& _track[track].portaToNoteSpeed) {
if (_track[track].period < _track[track].portaToNote) {
_track[track].period += _track[track].portaToNoteSpeed;
if (_track[track].period > _track[track].portaToNote)
_track[track].period = _track[track].portaToNote;
} else if (_track[track].period > _track[track].portaToNote) {
_track[track].period -= _track[track].portaToNoteSpeed;
if (_track[track].period < _track[track].portaToNote)
_track[track].period = _track[track].portaToNote;
}
}
vol = _track[track].vol;
if (ex == 0)
vol -= ey;
else if (ey == 0)
vol += ex;
if (vol < 0)
vol = 0;
else if (vol > 64)
vol = 64;
_track[track].vol = vol;
break;
case 0x6:
_track[track].vibrato =
(_track[track].vibratoDepth * sinetable[_track[track].vibratoPos]) / 128;
_track[track].vibratoPos += _track[track].vibratoSpeed;
_track[track].vibratoPos %= 64;
vol = _track[track].vol;
if (ex == 0)
vol -= ey;
else if (ey == 0)
vol += ex;
if (vol < 0)
vol = 0;
else if (vol > 64)
vol = 64;
_track[track].vol = vol;
break;
case 0xA:
vol = _track[track].vol;
if (ex == 0)
vol -= ey;
else if (ey == 0)
vol += ex;
if (vol < 0)
vol = 0;
else if (vol > 64)
vol = 64;
_track[track].vol = vol;
break;
case 0xE:
switch (ex) {
case 0x6:
break; // Pattern loop
case 0x9: // Retrigger note
if (ey && _tick % ey == 0)
_track[track].offset = 0.0;
break;
}
break;
}
}
}
void ProtrackerStream::interrupt(void) {
int track;
for (track = 0; track < 4; track++)
_track[track].offset = _voice[track].offset;
if (_tick == 0) {
if (_hasJumpToPattern) {
_hasJumpToPattern = false;
_pos = _jumpToPattern;
_row = 0;
} else if (_hasPatternBreak) {
_hasPatternBreak = false;
_row = _skiprow;
_pos = (_pos + 1) % _module->songlen;
_patternLoopRow = 0;
} else if (_hasPatternLoop) {
_hasPatternLoop = false;
_row = _patternLoopRow;
}
if (_row >= 64) {
_row = 0;
_pos = (_pos + 1) % _module->songlen;
_patternLoopRow = 0;
}
if (_patternDelay == 0) {
updateRow();
} else {
_patternDelay--;
}
} else
updateEffects();
_tick = (_tick + 1) % _speed;
if (_tick == 0)
_row++;
for (track = 0; track < 4; track++) {
_voice[track].period = _track[track].period + _track[track].vibrato;
_voice[track].volume = _track[track].vol;
if (_track[track].sample) {
sample_t &sample = _module->sample[_track[track].sample - 1];
_voice[track].data = sample.data;
_voice[track].dataRepeat = sample.replen > 2 ? sample.data + sample.repeat : 0;
_voice[track].length = sample.len;
_voice[track].lengthRepeat = sample.replen;
_voice[track].offset = _track[track].offset;
_track[track].sample = 0;
}
}
}
} // End of namespace Modules
namespace Audio {
AudioStream *makeProtrackerStream(Common::ReadStream *stream, int rate, bool stereo) {
return new Modules::ProtrackerStream(stream, rate, stereo);
}
} // End of namespace Audio
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