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/* 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) {
_musicData = NULL;
_allowedCommands = 0;
_skyDisk = pSkyDisk;
}
SkyMusicBase::~SkyMusicBase(void)
{
if (_currentMusic) stopMusic();
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;
}
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