mirror of
https://github.com/libretro/scummvm.git
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134 lines
3.7 KiB
C++
134 lines
3.7 KiB
C++
/* ScummVM - Scumm Interpreter
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* Copyright (C) 2003-2004 The ScummVM project
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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* $Header$
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*
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*/
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#include "sky/music/adlibmusic.h"
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#include "sky/music/adlibchannel.h"
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#include "sound/mixer.h"
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#include "sky/sky.h"
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namespace Sky {
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void AdlibMusic::passMixerFunc(void *param, int16 *buf, uint len) {
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((AdlibMusic*)param)->premixerCall(buf, len);
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}
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AdlibMusic::AdlibMusic(SoundMixer *pMixer, Disk *pDisk, OSystem *system)
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: MusicBase(pDisk, system) {
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_driverFileBase = 60202;
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_mixer = pMixer;
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_sampleRate = pMixer->getOutputRate();
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_opl = makeAdlibOPL(_sampleRate);
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_mixer->setupPremix(passMixerFunc, this);
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}
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AdlibMusic::~AdlibMusic(void) {
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_mixer->setupPremix(0, 0);
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// YM3812Shutdown();
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}
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void AdlibMusic::setVolume(uint8 volume) {
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_musicVolume = volume;
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for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++)
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_channels[cnt]->updateVolume(volume | 128);
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}
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void AdlibMusic::premixerCall(int16 *data, uint len) {
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if (_musicData == NULL) {
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// no music loaded
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memset(data, 0, 2 * len * sizeof(int16));
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} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
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// music loaded but not played as of yet
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memset(data, 0, 2 * len * sizeof(int16));
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// poll anyways as pollMusic() can activate the music
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pollMusic();
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_nextMusicPoll = _sampleRate/50;
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} else {
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uint32 render;
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int16 *origData = data;
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uint origLen = len;
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while (len) {
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render = (len > _nextMusicPoll) ? (_nextMusicPoll) : (len);
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len -= render;
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_nextMusicPoll -= render;
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YM3812UpdateOne(_opl, data, render);
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data += render;
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if (_nextMusicPoll == 0) {
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pollMusic();
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_nextMusicPoll = _sampleRate/50;
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}
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}
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// Convert mono data to stereo
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for (int i = (origLen - 1); i >= 0; i--) {
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origData[2 * i] = origData[2 * i + 1] = origData[i];
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}
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}
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}
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void AdlibMusic::setupPointers(void) {
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if (SkyEngine::_systemVars.gameVersion == 109) {
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// disk demo uses a different adlib driver version, some offsets have changed
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//_musicDataLoc = (_musicData[0x11CC] << 8) | _musicData[0x11CB];
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//_initSequence = _musicData + 0xEC8;
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_musicDataLoc = READ_LE_UINT16(_musicData + 0x1200);
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_initSequence = _musicData + 0xEFB;
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} else if (SkyEngine::_systemVars.gameVersion == 267) {
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_musicDataLoc = READ_LE_UINT16(_musicData + 0x11F7);
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_initSequence = _musicData + 0xE87;
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} else {
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_musicDataLoc = READ_LE_UINT16(_musicData + 0x1201);
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_initSequence = _musicData + 0xE91;
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}
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_nextMusicPoll = 0;
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}
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void AdlibMusic::setupChannels(uint8 *channelData) {
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_numberOfChannels = channelData[0];
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channelData++;
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for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
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uint16 chDataStart = ((channelData[(cnt << 1) | 1] << 8) | channelData[cnt << 1]) + _musicDataLoc;
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_channels[cnt] = new AdlibChannel(_opl, _musicData, chDataStart);
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_channels[cnt]->updateVolume(_musicVolume | 128);
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}
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}
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void AdlibMusic::startDriver(void) {
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uint16 cnt = 0;
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while (_initSequence[cnt] || _initSequence[cnt+1]) {
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OPLWriteReg (_opl, _initSequence[cnt], _initSequence[cnt+1]);
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cnt += 2;
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}
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_allowedCommands = 0xD;
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}
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} // End of namespace Sky
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