1 files changed, 128 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Sms_Apu.h b/plugins/gme/game-music-emu-0.6pre/gme/Sms_Apu.h
new file mode 100644
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+++ b/plugins/gme/game-music-emu-0.6pre/gme/Sms_Apu.h
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+// Sega Master System SN76489 PSG sound chip emulator
+
+// Sms_Snd_Emu 0.1.2
+#ifndef SMS_APU_H
+#define SMS_APU_H
+
+#include "blargg_common.h"
+#include "Blip_Buffer.h"
+
+struct sms_apu_state_t;
+
+class Sms_Apu {
+public:
+// Basics
+
+	// Sets buffer(s) to generate sound into, or 0 to mute. If only center is not 0,
+	// output is mono.
+	void set_output( Blip_Buffer* center, Blip_Buffer* left = NULL, Blip_Buffer* right = NULL );
+
+	// Emulates to time t, then writes data to Game Gear left/right assignment byte
+	void write_ggstereo( blip_time_t t, int data );
+	
+	// Emulates to time t, then writes data
+	void write_data( blip_time_t t, int data );
+	
+	// Emulates to time t, then subtracts t from the current time.
+	// OK if previous write call had time slightly after t.
+	void end_frame( blip_time_t t );
+
+// More features
+
+	// Resets sound chip and sets noise feedback bits and width
+	void reset( unsigned noise_feedback = 0, int noise_width = 0 );
+	
+	// Same as set_output(), but for a particular channel
+	// 0: Square 1, 1: Square 2, 2: Square 3, 3: Noise
+	enum { osc_count = 4 }; // 0 <= chan < osc_count
+	void set_output( int chan, Blip_Buffer* center, Blip_Buffer* left = NULL, Blip_Buffer* right = NULL );
+	
+	// Sets overall volume, where 1.0 is normal
+	void volume( double );
+	
+	// Sets treble equalization
+	void treble_eq( blip_eq_t const& );
+	
+	// Saves full emulation state to state_out. Data format is portable and
+	// includes some extra space to avoid expansion in case more state needs
+	// to be stored in the future.
+	void save_state( sms_apu_state_t* state_out );
+	
+	// Loads state. You should call reset() BEFORE this.
+	blargg_err_t load_state( sms_apu_state_t const& in );
+
+private:
+	// noncopyable
+	Sms_Apu( const Sms_Apu& );
+	Sms_Apu& operator = ( const Sms_Apu& );
+
+// Implementation
+public:
+	Sms_Apu();
+	~Sms_Apu() { }
+	BLARGG_DISABLE_NOTHROW
+	
+	// Use set_output() instead
+	BLARGG_DEPRECATED( void output    (        Blip_Buffer* c                                 ) { set_output( c, c, c    ); } )
+	BLARGG_DEPRECATED( void output    (        Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* r ) { set_output( c, l, r    ); } )
+	BLARGG_DEPRECATED( void osc_output( int i, Blip_Buffer* c                                 ) { set_output( i, c, c, c ); } )
+	BLARGG_DEPRECATED( void osc_output( int i, Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* r ) { set_output( i, c, l, r ); } )
+
+private:
+	struct Osc
+	{
+		Blip_Buffer* outputs [4]; // NULL, right, left, center
+		Blip_Buffer* output;
+		int          last_amp;
+		
+		int         volume;
+		int         period;
+		int         delay;
+		unsigned    phase;
+	};
+	
+	Osc     oscs [osc_count];
+	int     ggstereo;
+	int     latch;
+	
+	blip_time_t last_time;
+	int         min_tone_period;
+	unsigned    noise_feedback;
+	unsigned    looped_feedback;
+	Blip_Synth_Fast fast_synth;
+	Blip_Synth_Norm norm_synth;
+	
+	int calc_output( int i ) const;
+	void run_until( blip_time_t );
+	const char* save_load( sms_apu_state_t*, bool save );
+	friend class Sms_Apu_Tester;
+};
+
+struct sms_apu_state_t
+{
+	// If SMS_APU_CUSTOM_STATE is 1, values are stored as normal integers,
+	// so your code can then save and load them however it likes. Otherwise,
+	// they are 4-byte arrays in little-endian format, making entire
+	// structure suitable for direct storage on disk.
+	
+#if SMS_APU_CUSTOM_STATE
+	typedef int val_t;
+#else
+	typedef unsigned char val_t [4];
+#endif
+	
+	enum { format0 = 0x50414D53 };
+	
+	val_t format;
+	val_t version;
+	val_t latch;
+	val_t ggstereo;
+	val_t periods [4];
+	val_t volumes [4];
+	val_t delays  [4];
+	val_t phases  [4];
+	
+	val_t unused  [12]; // for future expansion
+};
+
+#endif