OPENGL: Merged from trunk, from rev 52105 to 53396.

This includes an rather hacky attempt to merge all the recent gp2x backend
changes into the branch. I suppose the gp2x backend and probably all new
backends, i.e. gph, dingux etc., might not compile anymore.

Since I have no way of testing those it would be nice if porters could look
into getting those up to speed in this branch.

svn-id: r53399

7 files changed, 133 insertions, 33 deletions

diff --git a/sound/softsynth/fmtowns_pc98/towns_audio.cpp b/sound/softsynth/fmtowns_pc98/towns_audio.cpp
index e74991a55f..e6da237881 100644
--- a/sound/softsynth/fmtowns_pc98/towns_audio.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_audio.cpp
@@ -103,7 +103,8 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 	_fmInstruments(0), _pcmInstruments(0), _pcmChan(0), _waveTables(0), _waveTablesTotalDataSize(0),
 	_baserate(55125.0f / (float)mixer->getOutputRate()), _tickLength(0), _timer(0), _drv(driver),
 	_pcmSfxChanMask(0),	_musicVolume(Audio::Mixer::kMaxMixerVolume), _sfxVolume(Audio::Mixer::kMaxMixerVolume),
-	_outputVolumeFlags(0), _outputMuteFlags(0), _ready(false) {
+	_outputVolumeFlags(0), _outputMuteFlags(0), _pcmChanOut(0), _pcmChanReserved(0), _pcmChanKeyPressed(0),
+	_pcmChanEffectPlaying(0), _pcmChanKeyPlaying(0), _ready(false) {
 
 #define INTCB(x) &TownsAudioInterface::intf_##x
 	static const TownsAudioIntfCallback intfCb[] = {
@@ -199,7 +200,7 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 		INTCB(notImpl),
 		// 72
 		INTCB(notImpl),
-		INTCB(notImpl),
+		INTCB(cdaToggle),
 		INTCB(notImpl),
 		INTCB(notImpl),
 		// 76
@@ -224,6 +225,10 @@ TownsAudioInterface::TownsAudioInterface(Audio::Mixer *mixer, TownsAudioInterfac
 }
 
 TownsAudioInterface::~TownsAudioInterface() {
+	reset();
+	_ready = false;
+	deinit();
+
 	delete[] _fmSaveReg[0];
 	delete[] _fmSaveReg[1];
 	delete[] _fmInstruments;
@@ -236,9 +241,6 @@ bool TownsAudioInterface::init() {
 	if (_ready)
 		return true;
 
-	if (!_drv)
-		return false;
-
 	if (!TownsPC98_FmSynth::init())
 		return false;
 
@@ -253,9 +255,9 @@ bool TownsAudioInterface::init() {
 
 	setVolumeChannelMasks(-1, 0);
 
+	_ready = true;
 	callback(0);
 
-	_ready = true;
 	return true;
 }
 
@@ -352,8 +354,9 @@ void TownsAudioInterface::timerCallbackA() {
 
 void TownsAudioInterface::timerCallbackB() {
 	Common::StackLock lock(_mutex);
-	if (_drv && _ready) {
-		_drv->timerCallback(1);
+	if (_ready) {
+		if (_drv)
+			_drv->timerCallback(1);
 		callback(80);
 	}
 }
@@ -491,7 +494,7 @@ int TownsAudioInterface::intf_enableTimerB(va_list &args) {
 int TownsAudioInterface::intf_loadSamples(va_list &args) {
 	uint32 dest = va_arg(args, uint32);
 	int size = va_arg(args, int);
-	uint8 *src = va_arg(args, uint8*);	
+	uint8 *src = va_arg(args, uint8*);
 
 	if (dest >= 65536 || size == 0 || size > 65536)
 		return 3;
@@ -563,7 +566,7 @@ int TownsAudioInterface::intf_loadWaveTable(va_list &args) {
 
 	TownsAudio_WaveTable *s = &_waveTables[_numWaveTables++];
 	s->readHeader(data);
-	
+
 	_waveTablesTotalDataSize += s->size;
 	callback(32, _waveTablesTotalDataSize, s->size, data + 32);
 
@@ -658,7 +661,7 @@ int TownsAudioInterface::intf_pcmEffectPlaying(va_list &args) {
 	if (chan < 0x40 || chan > 0x47)
 		return 1;
 	chan -= 0x40;
-	return (_pcmChanEffectPlaying & _chanFlags[chan]) ? true : false;
+	return (_pcmChanEffectPlaying & _chanFlags[chan]) ? 1 : 0;
 }
 
 int TownsAudioInterface::intf_fmKeyOn(va_list &args) {
@@ -719,11 +722,11 @@ int TownsAudioInterface::intf_setOutputVolume(va_list &args) {
 	static const uint8 flags[] = { 0x0C, 0x30, 0x40, 0x80 };
 
 	uint8 chan = (chanType & 0x40) ? 8 : 12;
-	
+
 	chanType &= 3;
 	left = (left & 0x7e) >> 1;
 	right = (right & 0x7e) >> 1;
-	
+
 	if (chan)
 		_outputVolumeFlags |= flags[chanType];
 	else
@@ -758,6 +761,12 @@ int TownsAudioInterface::intf_updateOutputVolume(va_list &args) {
 	return 0;
 }
 
+int TownsAudioInterface::intf_cdaToggle(va_list &args) {
+	//int mode = va_arg(args, int);
+	//_unkMask = mode ? 0x7f : 0x3f;
+	return 0;
+}
+
 int TownsAudioInterface::intf_pcmUpdateEnvelopeGenerator(va_list &args) {
 	for (int i = 0; i < 8; i++)
 		pcmUpdateEnvelopeGenerator(i);
@@ -1389,10 +1398,13 @@ void TownsAudioInterface::updateOutputVolume() {
 	// FM Towns seems to support volumes of 0 - 63 for each channel.
 	// We recalculate sane values for our 0 to 255 volume range and
 	// balance values for our -128 to 127 volume range
-	
+
 	// CD-AUDIO
-	int volume = (int)(((float)MAX(_outputLevel[12], _outputLevel[13]) * 255.0f) / 63.0f);
-	int balance = (int)((float)((_outputLevel[13] - _outputLevel[12]) * 127.0f) / (float)MAX(_outputLevel[12], _outputLevel[13]));
+	uint32 maxVol = MAX(_outputLevel[12], _outputLevel[13]);
+
+	int volume = (int)(((float)(maxVol * 255) / 63.0f));
+	int balance = maxVol ? (int)( ( ((int)_outputLevel[13] - _outputLevel[12]) * 127) / (float)maxVol) : 0;
+
 	g_system->getAudioCDManager()->setVolume(volume);
 	g_system->getAudioCDManager()->setBalance(balance);
 }
diff --git a/sound/softsynth/fmtowns_pc98/towns_audio.h b/sound/softsynth/fmtowns_pc98/towns_audio.h
index 950c016b4e..95fb1ded59 100644
--- a/sound/softsynth/fmtowns_pc98/towns_audio.h
+++ b/sound/softsynth/fmtowns_pc98/towns_audio.h
@@ -95,6 +95,7 @@ private:
 	int intf_setOutputVolume(va_list &args);
 	int intf_resetOutputVolume(va_list &args);
 	int intf_updateOutputVolume(va_list &args);
+	int intf_cdaToggle(va_list &args);
 	int intf_pcmUpdateEnvelopeGenerator(va_list &args);
 
 	int intf_notImpl(va_list &args);
diff --git a/sound/softsynth/fmtowns_pc98/towns_euphony.cpp b/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
index 0c0c203cc9..7b52b4594f 100644
--- a/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_euphony.cpp
@@ -131,7 +131,7 @@ void TownsEuphonyDriver::unloadWaveTable(int id) {
 void TownsEuphonyDriver::reserveSoundEffectChannels(int num) {
 	_intf->callback(33, num);
 	uint32 volMask = 0;
-	
+
 	if (num > 8)
 		return;
 
@@ -139,7 +139,7 @@ void TownsEuphonyDriver::reserveSoundEffectChannels(int num) {
 		volMask |= v;
 		v >>= 1;
 	}
-	
+
 	_intf->setSoundEffectChanMask(volMask);
 }
 
@@ -560,10 +560,10 @@ uint8 TownsEuphonyDriver::appendEvent(uint8 evt, uint8 chan) {
 
 void TownsEuphonyDriver::sendEvent(uint8 mode, uint8 command) {
 	if (mode == 0) {
-		warning("TownsEuphonyDriver: Mode 0 not implemented.");
+		// warning("TownsEuphonyDriver: Mode 0 not implemented");
 
 	} else if (mode == 0x10) {
-		warning("TownsEuphonyDriver: Mode 0x10 not implemented.");
+		warning("TownsEuphonyDriver: Mode 0x10 not implemented");
 
 	} else if (mode == 0xff) {
 		if (command >= 0xf0) {
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_driver.cpp b/sound/softsynth/fmtowns_pc98/towns_pc98_driver.cpp
index 82d0bd0438..8047616dbf 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_driver.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_driver.cpp
@@ -160,6 +160,7 @@ public:
 	void reset();
 };
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 class TownsPC98_MusicChannelPCM : public TownsPC98_MusicChannel {
 public:
 	TownsPC98_MusicChannelPCM(TownsPC98_AudioDriver *driver, uint8 regOffs,
@@ -178,6 +179,7 @@ private:
 	typedef bool (TownsPC98_MusicChannelPCM::*ControlEventFunc)(uint8 para);
 	const ControlEventFunc *controlEvents;
 };
+#endif
 
 TownsPC98_MusicChannel::TownsPC98_MusicChannel(TownsPC98_AudioDriver *driver, uint8 regOffs, uint8 flgs, uint8 num,
         uint8 key, uint8 prt, uint8 id) : _drv(driver), _regOffset(regOffs), _flags(flgs), _chanNum(num), _keyNum(key),
@@ -312,7 +314,7 @@ void TownsPC98_MusicChannel::processEvents() {
 void TownsPC98_MusicChannel::processFrequency() {
 	if (_flags & CHS_RECALCFREQ) {
 
-		_frequency = (((const uint16 *)_drv->_opnFreqTable)[_frqBlockMSB & 0x0f] + _frqLSB) | (((_frqBlockMSB & 0x70) >> 1) << 8);
+		_frequency = (READ_LE_UINT16(&_drv->_opnFreqTable[(_frqBlockMSB & 0x0f) << 1]) + _frqLSB) | (((_frqBlockMSB & 0x70) >> 1) << 8);
 
 		_drv->writeReg(_part, _regOffset + 0xa4, (_frequency >> 8));
 		_drv->writeReg(_part, _regOffset + 0xa0, (_frequency & 0xff));
@@ -709,7 +711,7 @@ void TownsPC98_MusicChannelSSG::processFrequency() {
 
 	if (_flags & CHS_RECALCFREQ) {
 		_block = _frqBlockMSB >> 4;
-		_frequency = ((const uint16 *)_drv->_opnFreqTableSSG)[_frqBlockMSB & 0x0f] + _frqLSB;
+		_frequency = READ_LE_UINT16(&_drv->_opnFreqTableSSG[(_frqBlockMSB & 0x0f) << 1]) + _frqLSB;
 
 		uint16 f = _frequency >> _block;
 		_drv->writeReg(_part, _regOffset << 1, f & 0xff);
@@ -928,6 +930,7 @@ void TownsPC98_SfxChannel::reset() {
 	_drv->_ssgPatches[i + 12] = src[i + 12];
 }
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 TownsPC98_MusicChannelPCM::TownsPC98_MusicChannelPCM(TownsPC98_AudioDriver *driver, uint8 regOffs,
         uint8 flgs, uint8 num, uint8 key, uint8 prt, uint8 id) :
 	TownsPC98_MusicChannel(driver, regOffs, flgs, num, key, prt, id), controlEvents(0) {
@@ -1016,9 +1019,13 @@ bool TownsPC98_MusicChannelPCM::control_ff_endOfTrack(uint8 para) {
 		return false;
 	}
 }
+#endif // DISABLE_PC98_RHYTHM_CHANNEL
 
 TownsPC98_AudioDriver::TownsPC98_AudioDriver(Audio::Mixer *mixer, EmuType type) : TownsPC98_FmSynth(mixer, type),
-	_channels(0), _ssgChannels(0), _sfxChannels(0), _rhythmChannel(0),
+	_channels(0), _ssgChannels(0), _sfxChannels(0),
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
+	_rhythmChannel(0),
+#endif
 	_trackPtr(0), _sfxData(0), _sfxOffs(0), _ssgPatches(0),
 	_patches(0), _sfxBuffer(0), _musicBuffer(0),
 
@@ -1027,7 +1034,13 @@ TownsPC98_AudioDriver::TownsPC98_AudioDriver(Audio::Mixer *mixer, EmuType type)
 
 	_updateChannelsFlag(type == kType26 ? 0x07 : 0x3F), _finishedChannelsFlag(0),
 	_updateSSGFlag(type == kTypeTowns ? 0x00 : 0x07), _finishedSSGFlag(0),
-	_updateRhythmFlag(type == kType86 ? 0x01 : 0x00), _finishedRhythmFlag(0),
+	_updateRhythmFlag(type == kType86 ?
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
+	0x01
+#else
+	0x00
+#endif
+	: 0x00), _finishedRhythmFlag(0),
 	_updateSfxFlag(0), _finishedSfxFlag(0),
 
 	_musicTickCounter(0),
@@ -1041,6 +1054,8 @@ TownsPC98_AudioDriver::TownsPC98_AudioDriver(Audio::Mixer *mixer, EmuType type)
 
 TownsPC98_AudioDriver::~TownsPC98_AudioDriver() {
 	reset();
+	_ready = false;
+	deinit();
 
 	if (_channels) {
 		for (int i = 0; i < _numChan; i++)
@@ -1059,8 +1074,9 @@ TownsPC98_AudioDriver::~TownsPC98_AudioDriver() {
 			delete _sfxChannels[i];
 		delete[] _sfxChannels;
 	}
-
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	delete _rhythmChannel;
+#endif
 
 	delete[] _ssgPatches;
 }
@@ -1104,10 +1120,12 @@ bool TownsPC98_AudioDriver::init() {
 		}
 	}
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_hasPercussion) {
 		_rhythmChannel = new TownsPC98_MusicChannelPCM(this, 0, 0, 0, 0, 0, 1);
 		_rhythmChannel->init();
 	}
+#endif
 
 	setMusicTempo(84);
 	setSfxTempo(654);
@@ -1149,7 +1167,9 @@ void TownsPC98_AudioDriver::loadMusicData(uint8 *data, bool loadPaused) {
 	}
 
 	if (_hasPercussion) {
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 		_rhythmChannel->loadData(data + READ_LE_UINT16(src_a));
+#endif
 		src_a += 2;
 	}
 
@@ -1209,8 +1229,10 @@ void TownsPC98_AudioDriver::reset() {
 		memcpy(_ssgPatches, _drvTables + 156, 256);
 	}
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_rhythmChannel)
 		_rhythmChannel->reset();
+#endif
 }
 
 void TownsPC98_AudioDriver::fadeStep() {
@@ -1230,10 +1252,12 @@ void TownsPC98_AudioDriver::fadeStep() {
 
 	if (!_fading) {
 		_fading = 19;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 		if (_hasPercussion) {
 			if (_updateRhythmFlag & _rhythmChannel->_idFlag)
 				_rhythmChannel->reset();
 		}
+#endif
 	} else {
 		if (!--_fading)
 			reset();
@@ -1260,9 +1284,11 @@ void TownsPC98_AudioDriver::timerCallbackB() {
 			}
 		}
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 		if (_hasPercussion)
 			if (_updateRhythmFlag & _rhythmChannel->_idFlag)
 				_rhythmChannel->processEvents();
+#endif
 	}
 
 	toggleRegProtection(false);
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_driver.h b/sound/softsynth/fmtowns_pc98/towns_pc98_driver.h
index 18daee1e72..00fcf7c5d5 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_driver.h
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_driver.h
@@ -31,13 +31,17 @@
 class TownsPC98_MusicChannel;
 class TownsPC98_MusicChannelSSG;
 class TownsPC98_SfxChannel;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 class TownsPC98_MusicChannelPCM;
+#endif
 
 class TownsPC98_AudioDriver : public TownsPC98_FmSynth {
 friend class TownsPC98_MusicChannel;
 friend class TownsPC98_MusicChannelSSG;
 friend class TownsPC98_SfxChannel;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 friend class TownsPC98_MusicChannelPCM;
+#endif
 public:
 	TownsPC98_AudioDriver(Audio::Mixer *mixer, EmuType type);
 	~TownsPC98_AudioDriver();
@@ -84,7 +88,9 @@ protected:
 	TownsPC98_MusicChannel **_channels;
 	TownsPC98_MusicChannelSSG **_ssgChannels;
 	TownsPC98_SfxChannel **_sfxChannels;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	TownsPC98_MusicChannelPCM *_rhythmChannel;
+#endif
 
 	const uint8 *_opnCarrier;
 	const uint8 *_opnFreqTable;
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
index 241b9bde50..e779812c42 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.cpp
@@ -377,6 +377,7 @@ private:
 	bool _ready;
 };
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 class TownsPC98_FmSynthPercussionSource {
 public:
 	TownsPC98_FmSynthPercussionSource(const uint32 timerbase, const uint32 rtt);
@@ -442,6 +443,7 @@ private:
 
 	bool _ready;
 };
+#endif // DISABLE_PC98_RHYTHM_CHANNEL
 
 TownsPC98_FmSynthSquareSineSource::TownsPC98_FmSynthSquareSineSource(const uint32 timerbase, const uint32 rtt) : _tlTable(0),
 	_rtt(rtt), _tleTable(0), _updateRequest(-1), _tickLength(timerbase * 27), _ready(0), _reg(0), _rand(1), _outN(1),
@@ -627,6 +629,7 @@ void TownsPC98_FmSynthSquareSineSource::updateRegs() {
 	_updateRequest = -1;
 }
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 TownsPC98_FmSynthPercussionSource::TownsPC98_FmSynthPercussionSource(const uint32 timerbase, const uint32 rtt) :
 	_rtt(rtt), _tickLength(timerbase * 2), _timer(0), _ready(false), _volMaskA(0), _volMaskB(0), _volumeA(Audio::Mixer::kMaxMixerVolume), _volumeB(Audio::Mixer::kMaxMixerVolume) {
 
@@ -823,11 +826,16 @@ void TownsPC98_FmSynthPercussionSource::advanceInput(RhtChannel *ins) {
 		cur >>= 4;
 	}
 }
+#endif // DISABLE_PC98_RHYTHM_CHANNEL
 
 TownsPC98_FmSynth::TownsPC98_FmSynth(Audio::Mixer *mixer, EmuType type) :
 	_mixer(mixer),
-	_chanInternal(0), _ssg(0), _prc(0),
-	_numChan(type == kType26 ? 3 : 6), _numSSG(type == kTypeTowns ? 0 : 3), _hasPercussion(type == kType86 ? true : false),
+	_chanInternal(0), _ssg(0),
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
+	_prc(0),
+#endif
+	_numChan(type == kType26 ? 3 : 6), _numSSG(type == kTypeTowns ? 0 : 3),
+	_hasPercussion(type == kType86 ? true : false),
 	_oprRates(0), _oprRateshift(0), _oprAttackDecay(0), _oprFrq(0), _oprSinTbl(0), _oprLevelOut(0), _oprDetune(0),
 	 _rtt(type == kTypeTowns ? 0x514767 : 0x5B8D80), _baserate(55125.0f / (float)mixer->getOutputRate()),
 	_volMaskA(0), _volMaskB(0), _volumeA(255), _volumeB(255),
@@ -835,16 +843,19 @@ TownsPC98_FmSynth::TownsPC98_FmSynth(Audio::Mixer *mixer, EmuType type) :
 
 	memset(&_timers[0], 0, sizeof(ChipTimer));
 	memset(&_timers[1], 0, sizeof(ChipTimer));
-	_timers[0].cb = &TownsPC98_FmSynth::timerCallbackA;
-	_timers[1].cb = &TownsPC98_FmSynth::timerCallbackB;
-	_timerbase = (uint32)(_baserate * 1000000.0f);	
+
+	_timers[0].cb = _timers[1].cb = &TownsPC98_FmSynth::idleTimerCallback;
+	_timerbase = (uint32)(_baserate * 1000000.0f);
 }
 
 TownsPC98_FmSynth::~TownsPC98_FmSynth() {
-	Common::StackLock lock(_mutex);
-	_mixer->stopHandle(_soundHandle);
+	if (_ready)
+		deinit();
+
 	delete _ssg;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	delete _prc;
+#endif
 	delete[] _chanInternal;
 
 	delete[] _oprRates;
@@ -876,10 +887,15 @@ bool TownsPC98_FmSynth::init() {
 		_ssg->init(&_ssgTables[0], &_ssgTables[16]);
 	}
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_hasPercussion) {
 		_prc = new TownsPC98_FmSynthPercussionSource(_timerbase, _rtt);
 		_prc->init(_percussionData);
 	}
+#endif
+
+	_timers[0].cb = &TownsPC98_FmSynth::timerCallbackA;
+	_timers[1].cb = &TownsPC98_FmSynth::timerCallbackB;
 
 	_mixer->playStream(Audio::Mixer::kPlainSoundType,
 	                   &_soundHandle, this, -1, Audio::Mixer::kMaxChannelVolume, 0, DisposeAfterUse::NO, true);
@@ -890,6 +906,7 @@ bool TownsPC98_FmSynth::init() {
 }
 
 void TownsPC98_FmSynth::reset() {
+	Common::StackLock lock(_mutex);
 	for (int i = 0; i < _numChan; i++) {
 		for (int ii = 0; ii < 4; ii++)
 			_chanInternal[i].opr[ii]->reset();
@@ -905,8 +922,10 @@ void TownsPC98_FmSynth::reset() {
 	if (_ssg)
 		_ssg->reset();
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_prc)
 		_prc->reset();
+#endif
 }
 
 void TownsPC98_FmSynth::writeReg(uint8 part, uint8 regAddress, uint8 value) {
@@ -940,9 +959,11 @@ void TownsPC98_FmSynth::writeReg(uint8 part, uint8 regAddress, uint8 value) {
 			_ssg->writeReg(l, value);
 		break;
 	case 0x10:
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 		// pcm rhythm channel
 		if (_prc)
 			_prc->writeReg(l, value);
+#endif
 		break;
 	case 0x20:
 		if (l == 8) {
@@ -1103,7 +1124,7 @@ int TownsPC98_FmSynth::readBuffer(int16 *buffer, const int numSamples) {
 	memset(tmp, 0, sizeof(int32) * numSamples);
 	int32 samplesLeft = numSamples >> 1;
 
-	while (samplesLeft) {
+	while (_ready && samplesLeft) {
 		int32 render = samplesLeft;
 
 		for (int i = 0; i < 2; i++) {
@@ -1134,8 +1155,10 @@ int TownsPC98_FmSynth::readBuffer(int16 *buffer, const int numSamples) {
 
 		if (_ssg)
 			_ssg->nextTick(tmp, render);
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 		if (_prc)
 			_prc->nextTick(tmp, render);
+#endif
 
 		nextTickEx(tmp, render);
 
@@ -1154,6 +1177,13 @@ int TownsPC98_FmSynth::readBuffer(int16 *buffer, const int numSamples) {
 	return numSamples;
 }
 
+void TownsPC98_FmSynth::deinit() {
+	_ready = false;
+	_mixer->stopHandle(_soundHandle);
+	Common::StackLock lock(_mutex);
+	_timers[0].cb = _timers[1].cb = &TownsPC98_FmSynth::idleTimerCallback;
+}
+
 uint8 TownsPC98_FmSynth::readSSGStatus() {
 	return _ssg->chanEnable();
 }
@@ -1164,8 +1194,10 @@ void TownsPC98_FmSynth::setVolumeIntern(int volA, int volB) {
 	_volumeB = CLIP<uint16>(volB, 0, Audio::Mixer::kMaxMixerVolume);
 	if (_ssg)
 		_ssg->setVolumeIntern(_volumeA, _volumeB);
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_prc)
 		_prc->setVolumeIntern(_volumeA, _volumeB);
+#endif
 }
 
 void TownsPC98_FmSynth::setVolumeChannelMasks(int channelMaskA, int channelMaskB) {
@@ -1174,8 +1206,10 @@ void TownsPC98_FmSynth::setVolumeChannelMasks(int channelMaskA, int channelMaskB
 	_volMaskB = channelMaskB;
 	if (_ssg)
 		_ssg->setVolumeChannelMasks(_volMaskA >> _numChan, _volMaskB >> _numChan);
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	if (_prc)
 		_prc->setVolumeChannelMasks(_volMaskA >> (_numChan + _numSSG), _volMaskB >> (_numChan + _numSSG));
+#endif
 }
 
 void TownsPC98_FmSynth::generateTables() {
@@ -1388,6 +1422,7 @@ const int TownsPC98_FmSynth::_ssgTables[] = {
 	0x000575, 0x000463, 0x00039D, 0x0002FA, 0x000242, 0x0001B6, 0x00014C, 0x0000FB
 };
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 const uint8 TownsPC98_FmSynth::_percussionData[] = {
 	0, 24, 1, 192, 1, 216, 2, 128, 4, 88, 23, 64, 27, 152, 1, 128, 29, 24, 2, 128, 31, 152, 0, 128, 136, 128, 128, 128, 0, 136, 97, 103, 153, 139, 34, 163, 72, 195, 27, 69, 1, 154, 137, 35, 8, 51, 169, 122, 164, 75, 133, 203, 81, 146, 168, 121, 185, 68, 202, 8, 33, 237, 49, 177, 12, 133, 140, 17, 160, 42, 161, 10, 0, 137, 176, 57,
 	233, 41, 160, 136, 235, 65, 177, 137, 128, 26, 164, 28, 3, 157, 51, 137, 1, 152, 113, 161, 40, 146, 115, 192, 56, 5, 169, 66, 161, 56, 1, 50, 145, 59, 39, 168, 97, 1, 160, 57, 7, 153, 50, 153, 32, 2, 25, 129, 32, 20, 186, 66, 129, 24, 153, 164, 142, 130, 169, 153, 26, 242, 138, 217, 9, 128, 204, 58, 209, 172, 40, 176, 141,
@@ -1502,6 +1537,7 @@ const uint8 TownsPC98_FmSynth::_percussionData[] = {
 	45, 136, 18, 144, 105, 138, 1, 160, 14, 128, 132, 145, 186, 37, 138, 41, 192, 48, 145, 46, 160, 33, 44, 24, 225, 16, 13, 132, 136, 137, 16, 148, 25, 170, 194, 82, 152, 136, 91, 24, 42, 169, 33, 233, 131, 179, 24, 185, 149, 16, 57, 172, 164, 18, 10, 211, 160, 147, 211, 33, 138, 243, 129, 16, 41, 193, 0, 43, 132, 155, 73,
 	58, 145, 244, 145, 43, 35, 9, 171, 16, 110, 25, 8, 28, 74, 162, 128, 26, 27, 82, 45, 136, 153, 18, 8, 136, 8
 };
+#endif // DISABLE_PC98_RHYTHM_CHANNEL
 
 TownsPC98_FmSynth::ChanInternal::ChanInternal() {
 	memset(this, 0, sizeof(ChanInternal));
diff --git a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
index 3072503610..ddd249b1b8 100644
--- a/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
+++ b/sound/softsynth/fmtowns_pc98/towns_pc98_fmsynth.h
@@ -30,9 +30,21 @@
 #include "sound/mixer.h"
 #include "common/list.h"
 
+#ifdef __DS__
+/* This disables the rhythm channel when emulating the PC-98 type 86 sound card.
+ * The only purpose is code size reduction for certain backends.
+ * At the moment the only games which make use of the rhythm channel are the
+ * (very rare) PC-98 versions of Legend of Kyrandia 2 and Lands of Lore. Music will
+ * still be okay, just missing a couple of rhythm instruments.
+ */
+#define DISABLE_PC98_RHYTHM_CHANNEL
+#endif
+
 class TownsPC98_FmSynthOperator;
 class TownsPC98_FmSynthSquareSineSource;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 class TownsPC98_FmSynthPercussionSource;
+#endif
 
 enum EnvelopeState {
 	kEnvReady,
@@ -71,6 +83,8 @@ public:
 	}
 
 protected:
+	void deinit();
+
 	// Implement this in your inherited class if your driver generates
 	// additional output that has to be inserted into the buffer.
 	virtual void nextTickEx(int32 *buffer, uint32 bufferSize) {}
@@ -126,7 +140,9 @@ private:
 	};
 
 	TownsPC98_FmSynthSquareSineSource *_ssg;
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	TownsPC98_FmSynthPercussionSource *_prc;
+#endif
 	ChanInternal *_chanInternal;
 
 	uint8 *_oprRates;
@@ -140,6 +156,7 @@ private:
 	bool _regProtectionFlag;
 
 	typedef void (TownsPC98_FmSynth::*ChipTimerProc)();
+	void idleTimerCallback() {}
 
 	struct ChipTimer {
 		bool enabled;
@@ -165,7 +182,9 @@ private:
 	Audio::Mixer *_mixer;
 	Audio::SoundHandle _soundHandle;
 
+#ifndef DISABLE_PC98_RHYTHM_CHANNEL
 	static const uint8 _percussionData[];
+#endif
 	static const uint32 _adtStat[];
 	static const uint8 _detSrc[];
 	static const int _ssgTables[];