1 files changed, 193 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Gb_Apu.h b/plugins/gme/game-music-emu-0.6pre/gme/Gb_Apu.h
new file mode 100644
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+++ b/plugins/gme/game-music-emu-0.6pre/gme/Gb_Apu.h
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+// Nintendo Game Boy sound hardware emulator with save state support
+
+// Gb_Snd_Emu 0.1.4
+#ifndef GB_APU_H
+#define GB_APU_H
+
+#include "Gb_Oscs.h"
+
+struct gb_apu_state_t;
+
+class Gb_Apu {
+public:
+// Basics
+
+	// Sets buffer(s) to generate sound into, or NULL to mute. If only center is not NULL,
+	// 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 addr
+	void write_register( blip_time_t t, int addr, 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
+	
+	// Clock rate sound hardware runs at
+	enum { clock_rate = 4194304 * GB_APU_OVERCLOCK };
+	
+	// Registers are at io_addr to io_addr+io_size-1
+	enum { io_addr = 0xFF10 };
+	enum { io_size = 0x30 };
+	
+	// Emulates to time t, then reads from addr
+	int read_register( blip_time_t t, int addr );
+	
+	// Resets hardware to state after power, BEFORE boot ROM runs. Mode selects
+	// sound hardware. If agb_wave is true, enables AGB's extra wave features.
+	enum mode_t {
+		mode_dmg,   // Game Boy monochrome
+		mode_cgb,   // Game Boy Color
+		mode_agb    // Game Boy Advance
+	};
+	void reset( mode_t mode = mode_cgb, bool agb_wave = false );
+	
+	// Same as set_output(), but for a particular channel
+	// 0: Square 1, 1: Square 2, 2: Wave, 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& );
+	
+	// Treble and bass values for various hardware.
+	enum {
+		speaker_treble =  -47, // speaker on system
+		speaker_bass   = 2000,
+		dmg_treble     =    0, // headphones on each system
+		dmg_bass       =   30,
+		cgb_treble     =    0,
+		cgb_bass       =  300, // CGB has much less bass
+		agb_treble     =    0,
+		agb_bass       =   30
+	};
+	
+	// If true, reduces clicking by disabling DAC biasing. Note that this reduces
+	// emulation accuracy, since the clicks are authentic.
+	void reduce_clicks( bool reduce = true );
+	
+	// Sets frame sequencer rate, where 1.0 is normal. Meant for adjusting the
+	// tempo in a music player.
+	void set_tempo( double );
+	
+	// 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( gb_apu_state_t* state_out );
+	
+	// Loads state. You should call reset() BEFORE this.
+	blargg_err_t load_state( gb_apu_state_t const& in );
+
+private:
+	// noncopyable
+	Gb_Apu( const Gb_Apu& );
+	Gb_Apu& operator = ( const Gb_Apu& );
+
+// Implementation
+public:
+	Gb_Apu();
+	
+	// Use set_output() in place of these
+	BLARGG_DEPRECATED( void output    (        Blip_Buffer* c                                 ); )
+	BLARGG_DEPRECATED( void output    (        Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* 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 ); } )
+	
+	BLARGG_DEPRECATED_TEXT( enum { start_addr = 0xFF10 }; )
+	BLARGG_DEPRECATED_TEXT( enum { end_addr   = 0xFF3F }; )
+	BLARGG_DEPRECATED_TEXT( enum { register_count = end_addr - start_addr + 1 }; )
+
+private:    
+	Gb_Osc*     oscs [osc_count];
+	blip_time_t last_time;          // time sound emulator has been run to
+	blip_time_t frame_period;       // clocks between each frame sequencer step
+	double      volume_;
+	bool        reduce_clicks_;
+	
+	Gb_Sweep_Square square1;
+	Gb_Square       square2;
+	Gb_Wave         wave;
+	Gb_Noise        noise;
+	blip_time_t     frame_time;     // time of next frame sequencer action
+	int             frame_phase;    // phase of next frame sequencer step
+	enum { regs_size = io_size + 0x10 };
+	BOOST::uint8_t  regs [regs_size];// last values written to registers
+	
+	// large objects after everything else
+	Blip_Synth_Norm norm_synth;
+	Blip_Synth_Fast fast_synth;
+	
+	void reset_lengths();
+	void reset_regs();
+	int calc_output( int osc ) const;
+	void apply_stereo();
+	void apply_volume();
+	void synth_volume( int );
+	void run_until_( blip_time_t );
+	void run_until( blip_time_t );
+	void silence_osc( Gb_Osc& );
+	void write_osc( int reg, int old_data, int data );
+	const char* save_load( gb_apu_state_t*, bool save );
+	void save_load2( gb_apu_state_t*, bool save );
+	friend class Gb_Apu2;
+};
+
+// Format of save state. Should be stable across versions of the library,
+// with earlier versions properly opening later save states. Includes some
+// room for expansion so the state size shouldn't increase.
+struct gb_apu_state_t
+{
+#if GB_APU_CUSTOM_STATE
+	// Values stored as plain int so your code can read/write them easily.
+	// Structure can NOT be written to disk, since format is not portable.
+	typedef int val_t;
+#else
+	// Values written in portable little-endian format, allowing structure
+	// to be written directly to disk.
+	typedef unsigned char val_t [4];
+#endif
+	
+	enum { format0 = 0x50414247 }; // 'GBAP'
+	
+	val_t format;   // format of all following data
+	val_t version;  // later versions just add fields to end
+	
+	unsigned char regs [0x40];
+	val_t frame_time;
+	val_t frame_phase;
+	
+	val_t sweep_freq;
+	val_t sweep_delay;
+	val_t sweep_enabled;
+	val_t sweep_neg;
+	val_t noise_divider;
+	val_t wave_buf;
+	
+	val_t delay      [4];
+	val_t length_ctr [4];
+	val_t phase      [4];
+	val_t enabled    [4];
+	
+	val_t env_delay   [3];
+	val_t env_volume  [3];
+	val_t env_enabled [3];
+	
+	val_t unused  [13]; // for future expansion
+};
+
+inline void Gb_Apu::set_output( Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* r )
+{
+	for ( int i = osc_count; --i >= 0; )
+		set_output( i, c, l, r );
+}
+
+BLARGG_DEPRECATED_TEXT( inline void Gb_Apu::output( Blip_Buffer* c                                 ) { set_output(    c, c, c ); } )
+BLARGG_DEPRECATED_TEXT( inline void Gb_Apu::output( Blip_Buffer* c, Blip_Buffer* l, Blip_Buffer* r ) { set_output(    c, l, r ); } )
+
+#endif