SCI: Some constification.

svn-id: r52726

6 files changed, 22 insertions, 22 deletions

diff --git a/engines/sci/sound/drivers/adlib.cpp b/engines/sci/sound/drivers/adlib.cpp
index 89ea426efc..20bac4a2c0 100644
--- a/engines/sci/sound/drivers/adlib.cpp
+++ b/engines/sci/sound/drivers/adlib.cpp
@@ -73,7 +73,7 @@ public:
 	bool loadResource(const byte *data, uint size);
 	virtual uint32 property(int prop, uint32 param);
 
-	bool useRhythmChannel() { return _rhythmKeyMap != NULL; }
+	bool useRhythmChannel() const { return _rhythmKeyMap != NULL; }
 
 private:
 	enum ChannelID {
@@ -173,14 +173,14 @@ public:
 	int open(ResourceManager *resMan);
 	void close();
 
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return MidiDriver_AdLib::kVoices; }
 	bool hasRhythmChannel() const { return false; }
 	void setVolume(byte volume) { static_cast<MidiDriver_AdLib *>(_driver)->setVolume(volume); }
 	void playSwitch(bool play) { static_cast<MidiDriver_AdLib *>(_driver)->playSwitch(play); }
 	void loadInstrument(int idx, byte *data);
 
-	int getLastChannel() { return (static_cast<MidiDriver_AdLib *>(_driver)->useRhythmChannel() ? 8 : 15); }
+	int getLastChannel() const { return (static_cast<const MidiDriver_AdLib *>(_driver)->useRhythmChannel() ? 8 : 15); }
 };
 
 static const byte registerOffset[MidiDriver_AdLib::kVoices] = {
@@ -837,7 +837,7 @@ void MidiPlayer_AdLib::close() {
 	}
 }
 
-byte MidiPlayer_AdLib::getPlayId() {
+byte MidiPlayer_AdLib::getPlayId() const {
 	switch (_version) {
 	case SCI_VERSION_0_EARLY:
 		return 0x01;
diff --git a/engines/sci/sound/drivers/amigamac.cpp b/engines/sci/sound/drivers/amigamac.cpp
index 4fb9146b53..4b591eb609 100644
--- a/engines/sci/sound/drivers/amigamac.cpp
+++ b/engines/sci/sound/drivers/amigamac.cpp
@@ -966,7 +966,7 @@ bool MidiDriver_AmigaMac::loadInstrumentsSCI1(Common::SeekableReadStream &file)
 class MidiPlayer_AmigaMac : public MidiPlayer {
 public:
 	MidiPlayer_AmigaMac(SciVersion version) : MidiPlayer(version) { _driver = new MidiDriver_AmigaMac(g_system->getMixer()); }
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return MidiDriver_AmigaMac::kVoices; }
 	bool hasRhythmChannel() const { return false; }
 	void setVolume(byte volume) { static_cast<MidiDriver_AmigaMac *>(_driver)->setVolume(volume); }
@@ -978,7 +978,7 @@ MidiPlayer *MidiPlayer_AmigaMac_create(SciVersion version) {
 	return new MidiPlayer_AmigaMac(version);
 }
 
-byte MidiPlayer_AmigaMac::getPlayId() {
+byte MidiPlayer_AmigaMac::getPlayId() const {
 	if (_version > SCI_VERSION_0_LATE)
 		return 0x06;
 
diff --git a/engines/sci/sound/drivers/fb01.cpp b/engines/sci/sound/drivers/fb01.cpp
index ab9b2e3df5..7560c62f4f 100644
--- a/engines/sci/sound/drivers/fb01.cpp
+++ b/engines/sci/sound/drivers/fb01.cpp
@@ -59,7 +59,7 @@ public:
 	void send(uint32 b);
 	void sysEx(const byte *msg, uint16 length);
 	bool hasRhythmChannel() const { return false; }
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return kVoices; } // 9 in SCI1?
 	void setVolume(byte volume);
 	int getVolume();
@@ -633,7 +633,7 @@ void MidiPlayer_Fb01::sysEx(const byte *msg, uint16 length) {
 	g_system->updateScreen();
 }
 
-byte MidiPlayer_Fb01::getPlayId() {
+byte MidiPlayer_Fb01::getPlayId() const {
 	switch (_version) {
 	case SCI_VERSION_0_EARLY:
 		return 0x01;
diff --git a/engines/sci/sound/drivers/midi.cpp b/engines/sci/sound/drivers/midi.cpp
index 11697c02ed..8ba7a6a352 100644
--- a/engines/sci/sound/drivers/midi.cpp
+++ b/engines/sci/sound/drivers/midi.cpp
@@ -53,10 +53,10 @@ public:
 	void send(uint32 b);
 	void sysEx(const byte *msg, uint16 length);
 	bool hasRhythmChannel() const { return true; }
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return kVoices; }
-	int getFirstChannel();
-	int getLastChannel();
+	int getFirstChannel() const;
+	int getLastChannel() const;
 	void setVolume(byte volume);
 	int getVolume();
 	void setReverb(byte reverb);
@@ -330,13 +330,13 @@ void MidiPlayer_Midi::send(uint32 b) {
 
 // We return 1 for mt32, because if we remap channels to 0 for mt32, those won't get played at all
 // NOTE: SSCI uses channels 1 through 8 for General MIDI as well, in the drivers I checked
-int MidiPlayer_Midi::getFirstChannel() {
+int MidiPlayer_Midi::getFirstChannel() const {
 	if (_isMt32)
 		return 1;
 	return 0;
 }
 
-int MidiPlayer_Midi::getLastChannel() {
+int MidiPlayer_Midi::getLastChannel() const {
 	if (_isMt32)
 		return 8;
 	return 15;
@@ -910,7 +910,7 @@ void MidiPlayer_Midi::sysEx(const byte *msg, uint16 length) {
 	g_system->updateScreen();
 }
 
-byte MidiPlayer_Midi::getPlayId() {
+byte MidiPlayer_Midi::getPlayId() const {
 	switch (_version) {
 	case SCI_VERSION_0_EARLY:
 	case SCI_VERSION_0_LATE:
diff --git a/engines/sci/sound/drivers/mididriver.h b/engines/sci/sound/drivers/mididriver.h
index 0e38cc696c..d7f2d42386 100644
--- a/engines/sci/sound/drivers/mididriver.h
+++ b/engines/sci/sound/drivers/mididriver.h
@@ -84,10 +84,10 @@ public:
 	MidiChannel *getPercussionChannel() { return _driver->getPercussionChannel(); }
 	virtual void setTimerCallback(void *timer_param, Common::TimerManager::TimerProc timer_proc) { _driver->setTimerCallback(timer_param, timer_proc); }
 
-	virtual byte getPlayId() = 0;
+	virtual byte getPlayId() const = 0;
 	virtual int getPolyphony() const = 0;
-	virtual int getFirstChannel() { return 0; }
-	virtual int getLastChannel() { return 15; }
+	virtual int getFirstChannel() const { return 0; }
+	virtual int getLastChannel() const { return 15; }
 
 	virtual void setVolume(byte volume) {
 		if(_driver)
@@ -98,7 +98,7 @@ public:
 		return _driver ? _driver->property(MIDI_PROP_MASTER_VOLUME, 0xffff) : 0;
 	}
 
-	virtual byte getReverb() { return _reverb; }
+	virtual byte getReverb() const { return _reverb; }
 	virtual void setReverb(byte reverb) { _reverb = reverb; }
 
 	virtual void playSwitch(bool play) {
diff --git a/engines/sci/sound/drivers/pcjr.cpp b/engines/sci/sound/drivers/pcjr.cpp
index bdf90eff5c..93de072865 100644
--- a/engines/sci/sound/drivers/pcjr.cpp
+++ b/engines/sci/sound/drivers/pcjr.cpp
@@ -234,13 +234,13 @@ class MidiPlayer_PCJr : public MidiPlayer {
 public:
 	MidiPlayer_PCJr(SciVersion version) : MidiPlayer(version) { _driver = new MidiDriver_PCJr(g_system->getMixer()); }
 	int open(ResourceManager *resMan) { return static_cast<MidiDriver_PCJr *>(_driver)->open(getPolyphony()); }
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return 3; }
 	bool hasRhythmChannel() const { return false; }
 	void setVolume(byte volume) { static_cast<MidiDriver_PCJr *>(_driver)->_global_volume = volume; }
 };
 
-byte MidiPlayer_PCJr::getPlayId() {
+byte MidiPlayer_PCJr::getPlayId() const {
 	switch (_version) {
 	case SCI_VERSION_0_EARLY:
 		return 0x02;
@@ -259,11 +259,11 @@ class MidiPlayer_PCSpeaker : public MidiPlayer_PCJr {
 public:
 	MidiPlayer_PCSpeaker(SciVersion version) : MidiPlayer_PCJr(version) { }
 
-	byte getPlayId();
+	byte getPlayId() const;
 	int getPolyphony() const { return 1; }
 };
 
-byte MidiPlayer_PCSpeaker::getPlayId() {
+byte MidiPlayer_PCSpeaker::getPlayId() const {
 	switch (_version) {
 	case SCI_VERSION_0_EARLY:
 		return 0x04;