From cda17beff56b0c503f03b5f75be0a5f589dbeedc Mon Sep 17 00:00:00 2001
From: Eugene Sandulenko
Date: Sat, 6 Jun 2009 18:21:49 +0000
Subject: Patch #1365914: "SCUMM: CMS support." Disabled by default. Still
 plenty to do.

svn-id: r41282
---
 engines/scumm/player_v2.h | 173 ++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 173 insertions(+)

(limited to 'engines/scumm/player_v2.h')

diff --git a/engines/scumm/player_v2.h b/engines/scumm/player_v2.h
index cd88d57602..25041f42a9 100644
--- a/engines/scumm/player_v2.h
+++ b/engines/scumm/player_v2.h
@@ -158,6 +158,179 @@ private:
 	void next_freqs(ChannelInfo *channel);
 };
 
+/**
+ * Scumm V2 CMS/Gameblaster MIDI driver.
+ */
+class Player_V2CMS : public Audio::AudioStream, public MusicEngine {
+public:
+	Player_V2CMS(ScummEngine *scumm, Audio::Mixer *mixer);
+	virtual ~Player_V2CMS();
+
+	virtual void setMusicVolume(int vol);
+	virtual void startSound(int sound);
+	virtual void stopSound(int sound);
+	virtual void stopAllSounds();
+	virtual int  getMusicTimer() const;
+	virtual int  getSoundStatus(int sound) const;
+
+	// AudioStream API
+	int readBuffer(int16 *buffer, const int numSamples);
+	bool isStereo() const { return true; }
+	bool endOfData() const { return false; }
+	int getRate() const { return _sample_rate; }
+	
+protected:
+
+#include "common/pack-start.h"	// START STRUCT PACKING
+	struct Voice {
+		byte attack;
+		byte decay;
+		byte sustain;
+		byte release;
+		byte octadd;
+		int16 vibrato;
+		int16 vibrato2;
+		int16 noise;
+	} PACKED_STRUCT;
+	
+	struct Voice2 {
+		byte *amplitudeOutput;
+		byte *freqOutput;
+		byte *octaveOutput;
+		
+		int8 channel;
+		int8 sustainLevel;
+		int8 attackRate;
+		int8 maxAmpl;
+		int8 decayRate;
+		int8 sustainRate;
+		int8 releaseRate;
+		int8 releaseTime;
+		int8 vibratoRate;
+		int8 vibratoDepth;
+		
+		int8 curVibratoRate;
+		int8 curVibratoUnk;
+
+		int8 unkVibratoRate;
+		int8 unkVibratoDepth;
+
+		int8 unkRate;
+		int8 unkCount;
+
+		int nextProcessState;
+		int8 curVolume;
+		int8 curOctave;
+		int8 curFreq;
+
+		int8 octaveAdd;
+
+		int8 playingNote;
+		Voice2 *nextVoice;
+
+		byte chanNumber;
+	} PACKED_STRUCT;
+	
+	struct MusicChip {
+		byte ampl[4];
+		byte freq[4];
+		byte octave[2];
+	} PACKED_STRUCT;
+#include "common/pack-end.h"	// END STRUCT PACKING
+
+	Voice _cmsVoicesBase[16];
+	Voice2 _cmsVoices[8];
+	MusicChip _cmsChips[2];
+	
+	char _tempo;
+	char _tempoSum;
+	byte _looping;
+	byte _octaveMask;
+	int16 _midiDelay;
+	Voice2 *_midiChannel[16];
+	byte _midiChannelUse[16];
+	byte *_midiData;
+	byte *_midiSongBegin;
+	
+	int _loadedMidiSong;
+	
+	byte _lastMidiCommand;
+	uint _outputTableReady;
+	byte _clkFrequenz;
+	byte _restart;
+	byte _curSno;
+	
+	void loadMidiData(byte *data, int sound);
+	void play();
+	
+	void processChannel(Voice2 *channel);
+	void processRelease(Voice2 *channel);
+	void processAttack(Voice2 *channel);
+	void processDecay(Voice2 *channel);
+	void processSustain(Voice2 *channel);
+	void processVibrato(Voice2 *channel);
+	
+	void playMusicChips(const MusicChip *table);
+	void playNote(byte *&data);
+	void clearNote(byte *&data);
+	void offAllChannels();
+	void playVoice();
+	void processMidiData(uint ticks);
+	
+	Voice2 *getFreeVoice();
+	Voice2 *getPlayVoice(byte param);
+	
+	// from Player_V2
+protected:
+	bool _isV3Game;
+	Audio::Mixer *_mixer;
+	Audio::SoundHandle _soundHandle;
+	ScummEngine *_vm;
+
+	int _header_len;
+
+	uint32 _sample_rate;
+	uint32 _next_tick;
+	uint32 _tick_len;
+
+	int _timer_count[4];
+	int _timer_output;
+
+	int   _current_nr;
+	byte *_current_data;
+	int   _next_nr;
+	byte *_next_data;
+	byte *_retaddr;
+
+private:
+	union ChannelInfo {
+		channel_data d;
+		uint16 array[sizeof(channel_data)/2];
+	};
+
+	int _music_timer;
+	int _music_timer_ctr;
+	int _ticks_per_music_timer;
+
+	Common::Mutex _mutex;
+	ChannelInfo _channels[5];
+
+protected:
+	void mutex_up();
+	void mutex_down();
+
+	virtual void nextTick();
+	virtual void clear_channel(int i);
+	virtual void chainSound(int nr, byte *data);
+	virtual void chainNextSound();
+
+private:
+	void do_mix(int16 *buf, uint len);
+
+	void execute_cmd(ChannelInfo *channel);
+	void next_freqs(ChannelInfo *channel);
+};
+
 } // End of namespace Scumm
 
 #endif
-- 
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