mirror of
https://github.com/libretro/scummvm.git
synced 2024-12-25 03:07:06 +00:00
474 lines
11 KiB
C++
474 lines
11 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2006 The ScummVM project
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* Based on code by madmoose
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* $URL$
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* $Id$
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*
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*/
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#include "common/stdafx.h"
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#include "sound/mods/protracker.h"
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#include "sound/mods/paula.h"
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#include "sound/mods/module.h"
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#include "sound/audiostream.h"
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namespace Modules {
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class ProtrackerStream : public ::Audio::Paula {
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private:
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Module _module;
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int _rate;
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int _tick;
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int _row;
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int _pos;
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int _speed;
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int _bpm;
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// For effect 0xB - Jump To Pattern;
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bool _hasJumpToPattern;
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int _jumpToPattern;
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// For effect 0xD - PatternBreak;
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bool _hasPatternBreak;
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int _skipRow;
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// For effect 0xE6 - Pattern Loop
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bool _hasPatternLoop;
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int _patternLoopCount;
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int _patternLoopRow;
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// For effect 0xEE - Pattern Delay
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byte _patternDelay;
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static const int16 sinetable[];
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struct {
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byte sample;
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uint16 period;
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double offset;
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byte vol;
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byte finetune;
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// For effect 0x0 - Arpeggio
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bool arpeggio;
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byte arpeggioNotes[3];
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// For effect 0x3 - Porta to note
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uint16 portaToNote;
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byte portaToNoteSpeed;
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// For effect 0x4 - Vibrato
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int vibrato;
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byte vibratoPos;
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byte vibratoSpeed;
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byte vibratoDepth;
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// For effect 0xED - Delay sample
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byte delaySample;
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byte delaySampleTick;
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} _track[4];
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public:
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ProtrackerStream(Common::ReadStream *stream, int rate, bool stereo);
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private:
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void startPlay() { _playing = true; _end = false; }
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void interrupt();
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void doPorta(int track) {
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if (_track[track].portaToNote && _track[track].portaToNoteSpeed) {
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if (_track[track].period < _track[track].portaToNote) {
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_track[track].period += _track[track].portaToNoteSpeed;
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if (_track[track].period > _track[track].portaToNote)
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_track[track].period = _track[track].portaToNote;
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} else if (_track[track].period > _track[track].portaToNote) {
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_track[track].period -= _track[track].portaToNoteSpeed;
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if (_track[track].period < _track[track].portaToNote)
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_track[track].period = _track[track].portaToNote;
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}
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}
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}
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void doVibrato(int track) {
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_track[track].vibrato =
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(_track[track].vibratoDepth * sinetable[_track[track].vibratoPos]) / 128;
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_track[track].vibratoPos += _track[track].vibratoSpeed;
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_track[track].vibratoPos %= 64;
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}
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void doVolSlide(int track, byte ex, byte ey) {
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int vol = _track[track].vol;
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if (ex == 0)
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vol -= ey;
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else if (ey == 0)
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vol += ex;
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if (vol < 0)
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vol = 0;
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else if (vol > 64)
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vol = 64;
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_track[track].vol = vol;
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}
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void updateRow();
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void updateEffects();
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};
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const int16 ProtrackerStream::sinetable[64] = {
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0, 24, 49, 74, 97, 120, 141, 161,
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180, 197, 212, 224, 235, 244, 250, 253,
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255, 253, 250, 244, 235, 224, 212, 197,
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180, 161, 141, 120, 97, 74, 49, 24,
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0, -24, -49, -74, -97, -120, -141, -161,
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-180, -197, -212, -224, -235, -244, -250, -253,
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-255, -253, -250, -244, -235, -224, -212, -197,
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-180, -161, -141, -120, -97, -74, -49, -24
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};
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ProtrackerStream::ProtrackerStream(Common::ReadStream *stream, int rate, bool stereo) :
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Paula(stereo, rate, rate/50) {
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bool result = _module.load(*stream);
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assert(result);
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_rate = rate;
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_tick = _row = _pos = 0;
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_speed = 6;
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_bpm = 125;
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_hasJumpToPattern = false;
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_jumpToPattern = 0;
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_hasPatternBreak = false;
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_skipRow = 0;
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_hasPatternLoop = false;
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_patternLoopCount = 0;
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_patternLoopRow = 0;
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_patternDelay = 0;
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memset(_track, 0, sizeof(_track));
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startPlay();
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}
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void ProtrackerStream::updateRow() {
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for (int track = 0; track < 4; track++) {
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_track[track].arpeggio = false;
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_track[track].vibrato = 0;
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_track[track].delaySampleTick = 0;
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note_t note =
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_module.pattern[_module.songpos[_pos]][_row][track];
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int effect = note.effect >> 8;
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if (note.sample) {
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if (_track[track].sample != note.sample) {
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_track[track].vibratoPos = 0;
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}
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_track[track].sample = note.sample;
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_track[track].finetune = _module.sample[note.sample - 1].finetune;
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_track[track].vol = _module.sample[note.sample - 1].vol;
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}
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if (note.period) {
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if (effect != 3 && effect != 5) {
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if (_track[track].finetune)
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_track[track].period = _module.noteToPeriod(note.note, _track[track].finetune);
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else
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_track[track].period = note.period;
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_track[track].offset = 0.0;
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}
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}
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int exy = note.effect & 0xff;
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if (exy);
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int ex = (note.effect >> 4) & 0xf;
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int ey = note.effect & 0xf;
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int vol;
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switch (effect) {
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case 0x0:
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if (ex || ey) {
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_track[track].arpeggio = true;
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if (note.period) {
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_track[track].arpeggioNotes[0] = note.note;
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_track[track].arpeggioNotes[1] = note.note + ex;
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_track[track].arpeggioNotes[2] = note.note + ey;
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}
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}
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break;
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case 0x1:
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break;
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case 0x2:
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break;
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case 0x3:
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if (note.period)
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_track[track].portaToNote = note.period;
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if (exy)
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_track[track].portaToNoteSpeed = exy;
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break;
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case 0x4:
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if (ex || ey) {
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_track[track].vibratoSpeed = ex;
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_track[track].vibratoDepth = ey;
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}
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break;
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case 0x5:
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doPorta(track);
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doVolSlide(track, ex, ey);
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break;
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case 0x6:
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doVibrato(track);
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doVolSlide(track, ex, ey);
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break;
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case 0x9: // Set sample offset
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if (exy) {
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_track[track].offset = exy * 256;
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_voice[track].offset = _track[track].offset;
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}
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break;
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case 0xA:
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break;
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case 0xB:
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_hasJumpToPattern = true;
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_jumpToPattern = exy;
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break;
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case 0xC:
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_track[track].vol = exy;
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break;
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case 0xD:
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_hasPatternBreak = true;
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_skipRow = ex * 10 + ey;
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break;
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case 0xE:
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switch (ex) {
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case 0x0: // Switch filters off
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break;
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case 0x1: // Fine slide up
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_track[track].period -= exy;
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break;
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case 0x2: // Fine slide down
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_track[track].period += exy;
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break;
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case 0x5: // Set finetune
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_track[track].finetune = ey;
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_module.sample[_track[track].sample].finetune = ey;
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if (note.period) {
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if (ey)
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_track[track].period = _module.noteToPeriod(note.note, ey);
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else
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_track[track].period = note.period;
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}
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break;
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case 0x6:
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if (ey == 0) {
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_patternLoopRow = _row;
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} else {
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_patternLoopCount++;
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if (_patternLoopCount <= ey)
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_hasPatternLoop = true;
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else
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_patternLoopCount = 0;
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}
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break;
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case 0x9:
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break; // Retrigger note
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case 0xA: // Fine volume slide up
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vol = _track[track].vol + ey;
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if (vol > 64)
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vol = 64;
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_track[track].vol = vol;
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break;
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case 0xB: // Fine volume slide down
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vol = _track[track].vol - ey;
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if (vol < 0)
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vol = 0;
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_track[track].vol = vol;
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break;
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case 0xD: // Delay sample
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_track[track].delaySampleTick = ey;
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_track[track].delaySample = _track[track].sample;
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_track[track].sample = 0;
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_track[track].vol = 0;
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break;
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case 0xE: // Pattern delay
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_patternDelay = ey;
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break;
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default:
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warning("Unimplemented effect %X\n", note.effect);
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}
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break;
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case 0xF:
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if (exy < 0x20) {
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_speed = exy;
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} else {
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_bpm = exy;
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setInterruptFreq((int) (getRate() / (_bpm * 0.4)));
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}
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break;
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default:
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warning("Unimplemented effect %X\n", note.effect);
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}
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}
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}
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void ProtrackerStream::updateEffects() {
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for (int track = 0; track < 4; track++) {
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_track[track].vibrato = 0;
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note_t note =
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_module.pattern[_module.songpos[_pos]][_row][track];
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int effect = note.effect >> 8;
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int exy = note.effect & 0xff;
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int ex = (note.effect >> 4) & 0xf;
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int ey = (note.effect) & 0xf;
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switch (effect) {
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case 0x0:
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if (ex || ey) {
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if (_tick == 1)
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_track[track].period =
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_module.noteToPeriod(_track[track].arpeggioNotes[0],
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_track[track].finetune);
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else
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_track[track].period =
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_module.noteToPeriod(_track[track].arpeggioNotes[_tick % 3],
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_track[track].finetune);
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}
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break;
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case 0x1:
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_track[track].period -= exy;
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break;
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case 0x2:
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_track[track].period += exy;
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break;
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case 0x3:
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doPorta(track);
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break;
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case 0x4:
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doVibrato(track);
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break;
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case 0x5:
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doPorta(track);
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doVolSlide(track, ex, ey);
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break;
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case 0x6:
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doVibrato(track);
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doVolSlide(track, ex, ey);
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break;
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case 0xA:
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doVolSlide(track, ex, ey);
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break;
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case 0xE:
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switch (ex) {
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case 0x6:
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break; // Pattern loop
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case 0x9: // Retrigger note
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if (ey && _tick % ey == 0)
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_track[track].offset = 0.0;
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break;
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case 0xD: // Delay sample
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if (_tick == _track[track].delaySampleTick) {
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_track[track].sample = _track[track].delaySample;
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_track[track].offset = 0.0;
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if (_track[track].sample)
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_track[track].vol = _module.sample[_track[track].sample - 1].vol;
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}
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break;
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}
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break;
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}
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}
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}
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void ProtrackerStream::interrupt(void) {
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int track;
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for (track = 0; track < 4; track++)
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_track[track].offset = _voice[track].offset;
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if (_tick == 0) {
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if (_track[track].arpeggio) {
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_track[track].period = _module.noteToPeriod(_track[track].arpeggioNotes[0],
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_track[track].finetune);
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}
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if (_hasJumpToPattern) {
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_hasJumpToPattern = false;
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_pos = _jumpToPattern;
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_row = 0;
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} else if (_hasPatternBreak) {
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_hasPatternBreak = false;
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_row = _skipRow;
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_pos = (_pos + 1) % _module.songlen;
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_patternLoopRow = 0;
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} else if (_hasPatternLoop) {
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_hasPatternLoop = false;
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_row = _patternLoopRow;
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}
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if (_row >= 64) {
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_row = 0;
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_pos = (_pos + 1) % _module.songlen;
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_patternLoopRow = 0;
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}
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updateRow();
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} else
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updateEffects();
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_tick = (_tick + 1) % (_speed + _patternDelay * _speed);
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if (_tick == 0) {
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_row++;
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_patternDelay = 0;
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}
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for (track = 0; track < 4; track++) {
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_voice[track].period = _track[track].period + _track[track].vibrato;
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_voice[track].volume = _track[track].vol;
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if (_track[track].sample) {
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sample_t &sample = _module.sample[_track[track].sample - 1];
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_voice[track].data = sample.data;
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_voice[track].dataRepeat = sample.replen > 2 ? sample.data + sample.repeat : 0;
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_voice[track].length = sample.len;
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_voice[track].lengthRepeat = sample.replen;
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_voice[track].offset = _track[track].offset;
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_track[track].sample = 0;
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}
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}
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}
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} // End of namespace Modules
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namespace Audio {
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AudioStream *makeProtrackerStream(Common::ReadStream *stream, int rate, bool stereo) {
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return new Modules::ProtrackerStream(stream, rate, stereo);
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}
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} // End of namespace Audio
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