SCI: adlib support (work-in-progress) for the new music player.

svn-id: r40287

1 files changed, 153 insertions, 0 deletions

diff --git a/engines/sci/sfx/softseq/adlib.h b/engines/sci/sfx/softseq/adlib.h
new file mode 100644
index 0000000000..836a92ef07
--- /dev/null
+++ b/engines/sci/sfx/softseq/adlib.h
@@ -0,0 +1,153 @@
+/* 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.
+ *
+ * $URL$
+ * $Id$
+ *
+ */
+
+#include "sci/sfx/sci_midi.h"
+#include "sound/fmopl.h"
+
+namespace Sci {
+
+class MidiDriver_Adlib : public MidiDriver_Emulated {
+public:
+	enum {
+		kVoices = 9
+	};
+
+	enum ChannelID {
+		kLeftChannel = 1,
+		kRightChannel = 2
+	};
+
+	struct AdlibOperator {
+		bool amplitudeMod;
+		bool vibrato;
+		bool envelopeType;
+		bool kbScaleRate;
+		byte frequencyMult;	// (0-15)
+		byte kbScaleLevel;	// (0-3)
+		byte totalLevel;	// (0-63, 0=max, 63=min)
+		byte attackRate;	// (0-15)
+		byte decayRate;		// (0-15)
+		byte sustainLevel;	// (0-15)
+		byte releaseRate;	// (0-15)
+		byte waveForm;		// (0-3)
+	};
+
+	struct AdlibModulator {
+		byte feedback;		// (0-7)
+		bool algorithm;
+	};
+
+	struct AdlibPatch {
+		AdlibOperator op[2];
+		AdlibModulator mod;
+	};
+
+	struct Channel {
+		uint8 patch;		// Patch setting
+		uint8 volume;		// Channel volume (0-63)
+		uint8 pan;			// Pan setting (0-127, 64 is center)
+		uint8 holdPedal;	// Hold pedal setting (0 to 63 is off, 127 to 64 is on)
+		uint8 extraVoices;	// The number of additional voices this channel optimally needs
+		uint16 pitchWheel;	// Pitch wheel setting (0-16383, 8192 is center)
+		uint8 lastVoice;	// Last voice used for this MIDI channel
+
+		Channel() : patch(0), volume(63), pan(64), holdPedal(0), extraVoices(0), pitchWheel(8192), lastVoice(0) { }
+	};
+
+	struct AdlibVoice {
+		int8 channel;		// MIDI channel that this voice is assigned to or -1
+		int8 note;			// Currently playing MIDI note or -1
+		int8 patch;			// Currently playing patch or -1
+		uint8 velocity;		// Note velocity
+		bool isSustained;	// Flag indicating a note that is being sustained by the hold pedal
+		uint16 age;			// Age of the current note
+
+		AdlibVoice() : channel(-1), note(-1), patch(-1), velocity(0), isSustained(false), age(0) { }
+	};
+
+	MidiDriver_Adlib(Audio::Mixer *mixer) : MidiDriver_Emulated(mixer), _playSwitch(true), _masterVolume(15) { }
+	~MidiDriver_Adlib() { }
+
+	// MidiDriver
+	int open();
+	void close();
+	void send(uint32 b);
+	MidiChannel *allocateChannel() { return NULL; }
+	MidiChannel *getPercussionChannel() { return NULL; }
+
+	// AudioStream
+	bool isStereo() const { return _stereo; }
+	int getRate() const { return _mixer->getOutputRate(); }
+
+	// MidiDriver_Emulated
+	void generateSamples(int16 *buf, int len);
+
+	void setVolume(byte volume);
+	void playSwitch(bool play);
+
+private:
+	bool _stereo;
+	FM_OPL *_fmopl[2];
+	bool _playSwitch;
+	int _masterVolume;
+	Channel _channels[MIDI_CHANNELS];
+	AdlibVoice _voices[kVoices];
+	Common::Array<AdlibPatch> _patches;
+
+	void sysEx(const byte *msg, uint16 length);
+	AdlibPatch *loadPatch(byte *data);
+	void voiceOn(int voice, int note, int velocity);
+	void voiceOff(int voice);
+	void setPatch(int voice, int patch);
+	void setNote(int voice, int note, bool key);
+	void setVelocity(int voice, int velocity);
+	void setOperator(int oper, AdlibOperator &op);
+	void setRegister(int reg, int value, int channels = kLeftChannel | kRightChannel);
+	void renewNotes(int channel, bool key);
+	void noteOn(int channel, int note, int velocity);
+	void noteOff(int channel, int note);
+	int findVoice(int channel);
+	void voiceMapping(int channel, int voices);
+	void assignVoices(int channel, int voices);
+	void releaseVoices(int channel, int voices);
+	void donateVoices();
+	int findVoiceBasic(int channel);
+	void setVelocityReg(int regOffset, int velocity, int pan, AdlibOperator &op);
+};
+
+class MidiPlayer_Adlib : public MidiPlayer {
+public:
+	MidiPlayer_Adlib() { _driver = new MidiDriver_Adlib(g_system->getMixer()); }
+	int open(ResourceManager *resmgr);
+	int getPlayMask() const { return 0x04; }
+	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);
+};
+
+} // End of namespace Sci
+