diff options
Diffstat (limited to 'sky/music/musicbase.cpp')
| -rw-r--r-- | sky/music/musicbase.cpp | 164 |
1 files changed, 164 insertions, 0 deletions
diff --git a/sky/music/musicbase.cpp b/sky/music/musicbase.cpp new file mode 100644 index 0000000000..7d930dae18 --- /dev/null +++ b/sky/music/musicbase.cpp @@ -0,0 +1,164 @@ +/* ScummVM - Scumm Interpreter + * Copyright (C) 2003 The ScummVM project + * + * 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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. + * + * $Header$ + * + */ + +#include "musicbase.h" + +SkyMusicBase::SkyMusicBase(SkyDisk *pSkyDisk, uint32 version) { + + _gameVersion = version; + _musicData = NULL; + _allowedCommands = 0; + _skyDisk = pSkyDisk; + _currentMusic = 0; +} + +SkyMusicBase::~SkyMusicBase(void) +{ + if (_musicData) free(_musicData); +} + +void SkyMusicBase::loadSection(uint8 pSection) +{ + if (_currentMusic) stopMusic(); + if (_musicData) free(_musicData); + _currentSection = pSection; + _musicData = _skyDisk->loadFile(_driverFileBase + FILES_PER_SECTION * pSection, NULL); + _allowedCommands = 0; + _musicTempo0 = 0x78; // init constants taken from idb file, area ~0x1060 + _musicTempo1 = 0xC0; + _musicVolume = 0x100; + _onNextPoll.doReInit = false; + _onNextPoll.doStopMusic = false; + _onNextPoll.musicToProcess = 0; + _tempo = _aktTime = 0x10001; + _numberOfChannels = _currentMusic = 0; + setupPointers(); + startDriver(); +} + +void SkyMusicBase::musicCommand(uint16 command) +{ + if (_musicData == NULL) { + debug(1,"Got music command but driver is not yet loaded.\n"); + return ; + } + if ((command >> 8) > _allowedCommands) { + debug(1,"got musicCommand %d while expecting <= %d\n", command >> 8, _allowedCommands); + return ; + } + switch(command >> 8) { + case 0: + debug(1,"SkyMusic: got call to startAdlibDriver(). Not necessary in this implementation.\n"); + break; + case 1: + debug(1,"SkyMusic: got call to stopDriver(). Not necessary in this implementation.\n"); + break; + case 2: + debug(1,"SkyMusic: got call to SetTempo(). Tempo is fixed in this implementation.\n"); + break; + case 3: + debug(1,"SkyMusic: ignored direct call to driverPoll().\n"); + break; + case 4: + startMusic(command&0xFF); + break; + case 6: + reinitFM(); + break; + case 7: + stopMusic(); + break; + case 13: + setFMVolume(command&0xFF); + break; + default: + debug(1,"musicCommand %d ignored.\n",command>>8); + } +} + +void SkyMusicBase::setFMVolume(uint16 param) +{ + _musicVolume = param; + for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) + _channels[cnt]->updateVolume(_musicVolume); +} + +void SkyMusicBase::stopMusic(void) +{ + for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) { + _channels[cnt]->stopNote(); + delete _channels[cnt]; + } + _numberOfChannels = 0; +} + +void SkyMusicBase::updateTempo(void) +{ + uint16 tempoMul = _musicTempo0*_musicTempo1; + uint16 divisor = 0x4446390/23864; + _tempo = (tempoMul / divisor)<<16; + _tempo |= (((tempoMul%divisor)<<16) | (tempoMul/divisor)) / divisor; +} + +void SkyMusicBase::loadNewMusic(void) +{ + uint16 musicPos; + if (_onNextPoll.musicToProcess > _musicData[_musicDataLoc]) { + error("Music %d requested but doesn't exist in file.\n", _onNextPoll.musicToProcess); + return; + } + if (_currentMusic != 0) stopMusic(); + + _currentMusic = _onNextPoll.musicToProcess; + _onNextPoll.musicToProcess = 0; + + if (_currentMusic != 0) { + musicPos = (_musicData[_musicDataLoc+2]<<8) | _musicData[_musicDataLoc+1]; + musicPos += _musicDataLoc+((_currentMusic-1)<<1); + musicPos = ((_musicData[musicPos+1]<<8) | _musicData[musicPos]) + _musicDataLoc; + + _musicTempo0 = _musicData[musicPos]; + _musicTempo1 = _musicData[musicPos+1]; + + setupChannels(_musicData + musicPos + 2); + + updateTempo(); + } +} + +void SkyMusicBase::pollMusic(void) +{ + uint8 newTempo; + if (_onNextPoll.doReInit) startDriver(); + if (_onNextPoll.doStopMusic) stopMusic(); + if (_onNextPoll.musicToProcess) loadNewMusic(); + + _aktTime += _tempo; + + for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) { + newTempo = _channels[cnt]->process((uint16)(_aktTime >> 16)); + if (newTempo) { + _musicTempo1 = newTempo; + updateTempo(); + } + } + _aktTime &= 0xFFFF; +} |