SCUMM: imuse driver directory cleanup

- move mac, pc speaker and fm-towns ims sound drivers into separate directory

(AdLib and MT32/GM drivers are still too entangled with common code to be moved so easily, especially MT32/GM. It would require lots of changes to the common code and possibly to all engines using the MidiDriver class. So I leave that for now.)

1 files changed, 161 insertions, 0 deletions

diff --git a/engines/scumm/imuse/drivers/pcspk.h b/engines/scumm/imuse/drivers/pcspk.h
new file mode 100644
index 0000000000..6a107e169a
--- /dev/null
+++ b/engines/scumm/imuse/drivers/pcspk.h
@@ -0,0 +1,161 @@
+/* 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.
+ *
+ */
+
+#ifndef SCUMM_IMUSE_PCSPK_H
+#define SCUMM_IMUSE_PCSPK_H
+
+#include "audio/softsynth/emumidi.h"
+#include "audio/softsynth/pcspk.h"
+
+namespace Scumm {
+
+class PcSpkDriver : public MidiDriver_Emulated {
+public:
+	PcSpkDriver(Audio::Mixer *mixer);
+	~PcSpkDriver();
+
+	virtual int open();
+	virtual void close();
+
+	virtual void send(uint32 d);
+	virtual void sysEx_customInstrument(byte channel, uint32 type, const byte *instr);
+
+	virtual MidiChannel *allocateChannel();
+	virtual MidiChannel *getPercussionChannel() { return 0; }
+
+	bool isStereo() const { return _pcSpk.isStereo(); }
+	int getRate() const { return _pcSpk.getRate(); }
+protected:
+	void generateSamples(int16 *buf, int len);
+	void onTimer();
+
+private:
+	Audio::PCSpeaker _pcSpk;
+	int _effectTimer;
+	uint8 _randBase;
+
+	void updateNote();
+	void output(uint16 out);
+
+	static uint8 getEffectModifier(uint16 level);
+	int16 getEffectModLevel(int16 level, int8 mod);
+	int16 getRandScale(int16 input);
+
+	struct EffectEnvelope {
+		uint8 state;
+		int16 currentLevel;
+		int16 duration;
+		int16 maxLevel;
+		int16 startLevel;
+		uint8 loop;
+		uint8 stateTargetLevels[4];
+		uint8 stateModWheelLevels[4];
+		uint8 modWheelSensitivity;
+		uint8 modWheelState;
+		uint8 modWheelLast;
+		int16 stateNumSteps;
+		int16 stateStepCounter;
+		int16 changePerStep;
+		int8 dir;
+		int16 changePerStepRem;
+		int16 changeCountRem;
+	};
+
+	struct EffectDefinition {
+		int16 phase;
+		uint8 type;
+		uint8 useModWheel;
+		EffectEnvelope *envelope;
+	};
+
+	struct OutputChannel {
+		uint8 active;
+		uint8 note;
+		uint8 sustainNoteOff;
+		uint8 length;
+		const uint8 *instrument;
+		uint8 unkA;
+		uint8 unkB;
+		uint8 unkC;
+		int16 unkE;
+		EffectEnvelope effectEnvelopeA;
+		EffectDefinition effectDefA;
+		EffectEnvelope effectEnvelopeB;
+		EffectDefinition effectDefB;
+		int16 unk60;
+	};
+
+	struct MidiChannel_PcSpk : public MidiChannel {
+		virtual MidiDriver *device();
+		virtual byte getNumber();
+		virtual void release();
+
+		virtual void send(uint32 b);
+		virtual void noteOff(byte note);
+		virtual void noteOn(byte note, byte velocity);
+		virtual void programChange(byte program);
+		virtual void pitchBend(int16 bend);
+		virtual void controlChange(byte control, byte value);
+		virtual void pitchBendFactor(byte value);
+		virtual void priority(byte value);
+		virtual void sysEx_customInstrument(uint32 type, const byte *instr);
+
+		void init(PcSpkDriver *owner, byte channel);
+		bool allocate();
+
+		PcSpkDriver *_owner;
+		bool _allocated;
+		byte _channel;
+
+		OutputChannel _out;
+		uint8 _instrument[23];
+		uint8 _programNr;
+		uint8 _priority;
+		uint8 _tl;
+		uint8 _modWheel;
+		uint8 _sustain;
+		uint8 _pitchBendFactor;
+		int16 _pitchBend;
+	};
+
+	void setupEffects(MidiChannel_PcSpk &chan, EffectEnvelope &env, EffectDefinition &def, byte flags, const byte *data);
+	void startEffect(EffectEnvelope &env, const byte *data);
+	void initNextEnvelopeState(EffectEnvelope &env);
+	void updateEffectGenerator(MidiChannel_PcSpk &chan, EffectEnvelope &env, EffectDefinition &def);
+	uint8 advanceEffectEnvelope(EffectEnvelope &env, EffectDefinition &def);
+
+	MidiChannel_PcSpk _channels[6];
+	MidiChannel_PcSpk *_activeChannel;
+
+	MidiChannel_PcSpk *_lastActiveChannel;
+	uint16 _lastActiveOut;
+
+	static const byte _outInstrumentData[1024];
+	static const byte _outputTable1[];
+	static const byte _outputTable2[];
+	static const uint16 _effectEnvStepTable[];
+	static const uint16 _frequencyTable[];
+};
+
+} // End of namespace Scumm
+
+#endif