Moved engines to the new engines/ directory

svn-id: r20582

1 files changed, 121 insertions, 0 deletions

diff --git a/engines/sky/music/adlibmusic.cpp b/engines/sky/music/adlibmusic.cpp
new file mode 100644
index 0000000000..e7ee4ecb6d
--- /dev/null
+++ b/engines/sky/music/adlibmusic.cpp
@@ -0,0 +1,121 @@
+/* ScummVM - Scumm Interpreter
+ * Copyright (C) 2003-2006 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "sky/music/adlibmusic.h"
+#include "sky/music/adlibchannel.h"
+#include "sound/mixer.h"
+#include "sky/sky.h"
+
+namespace Sky {
+
+AdlibMusic::AdlibMusic(Audio::Mixer *pMixer, Disk *pDisk)
+	: MusicBase(pDisk) {
+
+	_driverFileBase = 60202;
+	_mixer = pMixer;
+	_sampleRate = pMixer->getOutputRate();
+
+	_opl = makeAdlibOPL(_sampleRate);
+
+	_mixer->setupPremix(this);
+}
+
+AdlibMusic::~AdlibMusic(void) {
+
+	_mixer->setupPremix(0);
+}
+
+void AdlibMusic::premixerCall(int16 *data, uint len) {
+
+	if (_musicData == NULL) {
+		// no music loaded
+		memset(data, 0, 2 * len * sizeof(int16));
+	} else if ((_currentMusic == 0) || (_numberOfChannels == 0)) {
+		// music loaded but not played as of yet
+		memset(data, 0, 2 * len * sizeof(int16));
+		// poll anyways as pollMusic() can activate the music
+		pollMusic();
+		_nextMusicPoll = _sampleRate/50;
+	} else {
+		uint32 render;
+		int16 *origData = data;
+		uint origLen = len;
+		while (len) {
+			render = (len > _nextMusicPoll) ? (_nextMusicPoll) : (len);
+			len -= render;
+			_nextMusicPoll -= render;
+			YM3812UpdateOne(_opl, data, render);
+			data += render;
+			if (_nextMusicPoll == 0) {
+				pollMusic();
+				_nextMusicPoll = _sampleRate/50;
+			}
+		}
+
+		// Convert mono data to stereo
+		for (int i = (origLen - 1); i >= 0; i--) {
+			origData[2 * i] = origData[2 * i + 1] = origData[i];
+		}
+	}
+}
+
+void AdlibMusic::setupPointers(void) {
+
+	if (SkyEngine::_systemVars.gameVersion == 109) {
+		// disk demo uses a different adlib driver version, some offsets have changed
+		//_musicDataLoc = (_musicData[0x11CC] << 8) | _musicData[0x11CB];
+		//_initSequence = _musicData + 0xEC8;
+
+		_musicDataLoc = READ_LE_UINT16(_musicData + 0x1200);
+		_initSequence = _musicData + 0xEFB;
+	} else if (SkyEngine::_systemVars.gameVersion == 267) {
+		_musicDataLoc = READ_LE_UINT16(_musicData + 0x11F7);
+		_initSequence = _musicData + 0xE87;
+	} else {
+		_musicDataLoc = READ_LE_UINT16(_musicData + 0x1201);
+		_initSequence = _musicData + 0xE91;
+	}
+	_nextMusicPoll = 0;
+}
+
+void AdlibMusic::setupChannels(uint8 *channelData) {
+
+	_numberOfChannels = channelData[0];
+	channelData++;
+	for (uint8 cnt = 0; cnt < _numberOfChannels; cnt++) {
+		uint16 chDataStart = ((channelData[(cnt << 1) | 1] << 8) | channelData[cnt << 1]) + _musicDataLoc;
+		_channels[cnt] = new AdlibChannel(_opl, _musicData, chDataStart);
+		_channels[cnt]->updateVolume(_musicVolume);
+	}
+}
+
+void AdlibMusic::startDriver(void) {
+
+	uint16 cnt = 0;
+	while (_initSequence[cnt] || _initSequence[cnt+1]) {
+		OPLWriteReg (_opl, _initSequence[cnt], _initSequence[cnt+1]);
+		cnt += 2;
+	}
+	_allowedCommands = 0xD;
+}
+
+} // End of namespace Sky