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/* ScummVM - Graphic Adventure Engine
*
* ScummVM is the legal property of its developers, whose names
* are too numerous to list here. Please refer to the COPYRIGHT
* file distributed with this source distribution.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include "common/md5.h"
#include "xeen/music.h"
#include "xeen/xeen.h"
#include "xeen/files.h"
namespace Xeen {
#define CALLBACKS_PER_SECOND 60
Music::Music(Audio::Mixer *mixer) : _mixer(mixer), _effectsData(nullptr),
_musicPtr1(nullptr), _musicPtr2(nullptr), _lowMusicIgnored(false),
_fieldF(false), _field109(0), _field10B(0), _field114(0),
_field115(0), _field117(0) {
_channels.resize(ADLIB_CHANNEL_COUNT);
Common::fill(&_field10D[0], &_field10D[7], 0);
_mixer = mixer;
_opl = OPL::Config::create();
_opl->init();
_opl->start(new Common::Functor0Mem<void, Music>(this, &Music::onTimer), CALLBACKS_PER_SECOND);
loadEffectsData();
}
Music::~Music() {
_opl->stop();
delete _opl;
delete[] _effectsData;
}
void Music::loadEffectsData() {
File file("admus");
Common::String md5str = Common::computeStreamMD5AsString(file, 8192);
if (md5str != "be8989a5e868913f0e53963046e3ea13")
error("Unknown music driver encountered");
// Load in the driver data
const int EFFECTS_OFFSET = 0x91D;
byte *effectsData = new byte[file.size() - EFFECTS_OFFSET];
file.seek(EFFECTS_OFFSET);
file.read(effectsData, file.size() - EFFECTS_OFFSET);
file.close();
_effectsData = effectsData;
// Extract the effects offsets
_effectsOffsets.resize(180);
for (int idx = 0; idx < 180; ++idx)
_effectsOffsets[idx] = READ_LE_UINT16(&effectsData[idx * 2]) - EFFECTS_OFFSET;
}
void Music::onTimer() {
Common::StackLock slock(_driverMutex);
update();
flush();
}
void Music::write(int reg, int val) {
_queue.push(RegisterValue(reg, val));
}
void Music::flush() {
Common::StackLock slock(_driverMutex);
while (!_queue.empty()) {
RegisterValue v = _queue.pop();
_opl->writeReg(v._regNum, v._value);
}
}
void Music::update() {
// TODO
}
void Music::playEffect(uint effectId) {
if (!_lowMusicIgnored || effectId < 7 || effectId >= 11) {
if (effectId < _effectsOffsets.size()) {
_musicPtr1 = _musicPtr2 = &_effectsData[_effectsOffsets[effectId]];
_field117 = 0;
_field115 = 0;
_field114 = 0;
reset();
_lowMusicIgnored = true;
}
}
}
void Music::reset() {
if (!_fieldF) {
_field109 = 0;
setFrequency(7, 0);
_channels[7]._outputLevel = 63;
setOutputLevel(7, 63);
}
_field10B = 0;
setFrequency(8, 0);
_channels[8]._outputLevel = 63;
setOutputLevel(8, 63);
}
void Music::setFrequency(byte operatorNum, uint frequency) {
write(0xA0 + operatorNum, frequency & 0xff);
write(0xB0 + operatorNum, (frequency >> 8));
}
void Music::setOutputLevel(byte channelNum, uint level) {
write(0x40 + OPERATOR2_INDEXES[channelNum], level |
(_channels[channelNum]._scalingValue & 0xC0));
}
const byte Music::OPERATOR1_INDEXES[ADLIB_CHANNEL_COUNT] = {
0, 1, 2, 8, 9, 0xA, 0x10, 0x11, 0x12
};
const byte Music::OPERATOR2_INDEXES[ADLIB_CHANNEL_COUNT] = {
3, 4, 5, 0xB, 0xC, 0xD, 0x13, 0x14, 0x15
};
} // End of namespace Xeen
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