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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 "skymusic.h"
void SkyMusic::passMixerFunc(void *param, int16 *buf, uint len) {
((SkyMusic*)param)->premixerCall(buf, len);
}
void SkyMusic::premixerCall(int16 *buf, uint len) {
if (_musicData == NULL) {
// no music loaded
memset(buf, 0, len * sizeof(int16));
return;
} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
// music loaded but not played as of yet
memset(buf, 0, len * sizeof(int16));
// poll anyways as pollMusic() can activate the music
pollMusic();
_nextMusicPoll = _sampleRate/50;
return;
}
uint32 render;
while (len) {
render = (len > _nextMusicPoll) ? (_nextMusicPoll) : (len);
len -= render;
_nextMusicPoll -= render;
YM3812UpdateOne(_opl, buf, render);
buf += render;
if (_nextMusicPoll == 0) {
pollMusic();
_nextMusicPoll = _sampleRate/50;
}
}
}
SkyMusic::SkyMusic(SoundMixer *mixer, SkyDisk *pSkyDisk) {
_musicData = NULL;
_allowedCommands = 0;
_mixer = mixer;
_sampleRate = g_system->property(OSystem::PROP_GET_SAMPLE_RATE, 0);
int env_bits = g_system->property(OSystem::PROP_GET_FMOPL_ENV_BITS, NULL);
int eg_ent = g_system->property(OSystem::PROP_GET_FMOPL_EG_ENT, NULL);
OPLBuildTables((env_bits ? env_bits : FMOPL_ENV_BITS_HQ), (eg_ent ? eg_ent : FMOPL_EG_ENT_HQ));
_opl = OPLCreate(OPL_TYPE_YM3812, 3579545, _sampleRate);
_mixer->setupPremix(this, passMixerFunc);
_skyDisk = pSkyDisk;
}
SkyMusic::~SkyMusic(void)
{
if (_currentMusic) stopMusic();
_mixer->setupPremix(NULL, NULL);
if (_musicData) free(_musicData);
OPLDestroy(_opl);
}
void SkyMusic::loadSectionMusic(uint8 pSection)
{
if (_currentMusic) stopMusic();
if (_musicData) free(_musicData);
_musicData = _skyDisk->loadFile(MUSIC_BASE_FILE + FILES_PER_SECTION*pSection,NULL);
_allowedCommands = 0;
_musicTempo0 = 0x78; // init constants taken from idb file, area ~0x1060
_musicTempo1 = 0xC0;
_musicVolume = 0x100;
_numberOfChannels = _currentMusic = 0;
_musicDataLoc = (_musicData[0x1202]<<8)|_musicData[0x1201];
_initSequence = _musicData+0xE91;
_onNextPoll.doReInit = false;
_onNextPoll.doStopMusic = false;
_onNextPoll.musicToProcess = 0;
_tempo = _aktTime = 0x10001;
_nextMusicPoll = 0;
startAdlibDriver();
}
/*void SkyMusic::loadData(uint8 *pMusicData)
{
if (_currentMusic) stopMusic();
if (_musicData) free(_musicData);
_musicData = pMusicData;
_allowedCommands = 0;
_musicTempo0 = 0x78; // init constants taken from idb file, area ~0x1060
_musicTempo1 = 0xC0;
_musicVolume = 0x100;
_numberOfChannels = _currentMusic = 0;
_musicDataLoc = (_musicData[0x1202]<<8)|_musicData[0x1201];
_initSequence = _musicData+0xE91;
_onNextPoll.doReInit = false;
_onNextPoll.doStopMusic = false;
_onNextPoll.musicToProcess = 0;
_tempo = _aktTime = 0x10001;
_nextMusicPoll = 0;
}*/
void SkyMusic::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:
//startAdlibDriver(); break;
debug(1,"SkyMusic: got call to startAdlibDriver(). Not necessary in this implementation.\n");
break;
case 1:
//StopDriver(command&0xFF); break;
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 SkyMusic::setFMVolume(uint16 param)
{
_musicVolume = param;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
_channels[cnt]->updateVolume(_musicVolume);
}
void SkyMusic::startAdlibDriver(void)
{
uint16 cnt = 0;
while (_initSequence[cnt] || _initSequence[cnt+1]) {
OPLWriteReg(_opl, _initSequence[cnt], _initSequence[cnt+1]);
cnt += 2;
}
_allowedCommands = 0xD;
}
void SkyMusic::stopMusic(void)
{
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
_channels[cnt]->stopNote();
delete _channels[cnt];
}
_numberOfChannels = 0;
}
void SkyMusic::updateTempo(void)
{
uint16 tempoMul = _musicTempo0*_musicTempo1;
uint16 divisor = 0x4446390/23864;
_tempo = (tempoMul / divisor)<<16;
_tempo |= (((tempoMul%divisor)<<16) | (tempoMul/divisor)) / divisor;
}
void SkyMusic::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;
_musicTempo1 = _musicData[musicPos+1];
_musicTempo0 = _musicData[musicPos];
_numberOfChannels = _musicData[musicPos+2];
musicPos += 3;
for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
uint16 chDataStart = ((_musicData[musicPos+1]<<8) | _musicData[musicPos]) + _musicDataLoc;
_channels[cnt] = new SkyChannel(_musicData, chDataStart, _opl);
musicPos += 2;
}
updateTempo();
}
}
void SkyMusic::pollMusic(void)
{
uint8 newTempo;
if (_onNextPoll.doReInit) startAdlibDriver();
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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