1 files changed, 181 insertions, 0 deletions
diff --git a/plugins/gme/game-music-emu-0.6pre/gme/Nes_Apu.h b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Apu.h
new file mode 100644
index 00000000..1004338a
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+++ b/plugins/gme/game-music-emu-0.6pre/gme/Nes_Apu.h
@@ -0,0 +1,181 @@
+// NES 2A03 APU sound chip emulator
+
+// Nes_Snd_Emu 0.2.0-pre
+#ifndef NES_APU_H
+#define NES_APU_H
+
+#include "blargg_common.h"
+#include "Nes_Oscs.h"
+
+struct apu_state_t;
+class Nes_Buffer;
+
+class Nes_Apu {
+public:
+// Basics
+
+	typedef int nes_time_t; // NES CPU clock cycle count
+	
+	// Sets memory reader callback used by DMC oscillator to fetch samples.
+	// When callback is invoked, 'user_data' is passed unchanged as the
+	// first parameter.
+	//void dmc_reader( int (*callback)( void* user_data, int addr ), void* user_data = NULL );
+	
+	// Sets buffer to generate sound into, or 0 to mute output (reduces
+	// emulation accuracy).
+	void set_output( Blip_Buffer* );
+	
+	// All time values are the number of CPU clock cycles relative to the
+	// beginning of the current time frame. Before resetting the CPU clock
+	// count, call end_frame( last_cpu_time ).
+	
+	// Writes to register (0x4000-0x4013, and 0x4015 and 0x4017)
+	enum { io_addr = 0x4000 };
+	enum { io_size = 0x18 };
+	void write_register( nes_time_t, int addr, int data );
+	
+	// Reads from status register (0x4015)
+	enum { status_addr = 0x4015 };
+	int read_status( nes_time_t );
+	
+	// Runs all oscillators up to specified time, ends current time frame, then
+	// starts a new time frame at time 0. Time frames have no effect on emulation
+	// and each can be whatever length is convenient.
+	void end_frame( nes_time_t );
+	
+// Optional
+
+	// Resets internal frame counter, registers, and all oscillators.
+	// Uses PAL timing if pal_timing is true, otherwise use NTSC timing.
+	// Sets the DMC oscillator's initial DAC value to initial_dmc_dac without
+	// any audible click.
+	void reset( bool pal_mode = false, int initial_dmc_dac = 0 );
+	
+	// Same as set_output(), but for a particular channel
+	// 0: Square 1, 1: Square 2, 2: Triangle, 3: Noise, 4: DMC
+	enum { osc_count = 5 };
+	void set_output( int chan, Blip_Buffer* buf );
+	
+	// Adjusts frame period
+	void set_tempo( double );
+	
+	// Saves/loads exact emulation state
+	void save_state( apu_state_t* out ) const;
+	void load_state( apu_state_t const& );
+	
+	// Sets overall volume (default is 1.0)
+	void volume( double );
+	
+	// Sets treble equalization (see notes.txt)
+	void treble_eq( const blip_eq_t& );
+	
+	// Sets IRQ time callback that is invoked when the time of earliest IRQ
+	// may have changed, or NULL to disable. When callback is invoked,
+	// 'user_data' is passed unchanged as the first parameter.
+	//void irq_notifier( void (*callback)( void* user_data ), void* user_data = NULL );
+	
+	// Gets time that APU-generated IRQ will occur if no further register reads
+	// or writes occur. If IRQ is already pending, returns irq_waiting. If no
+	// IRQ will occur, returns no_irq.
+	enum { no_irq = INT_MAX/2 + 1 };
+	enum { irq_waiting = 0 };
+	nes_time_t earliest_irq( nes_time_t ) const;
+	
+	// Counts number of DMC reads that would occur if 'run_until( t )' were executed.
+	// If last_read is not NULL, set *last_read to the earliest time that
+	// 'count_dmc_reads( time )' would result in the same result.
+	int count_dmc_reads( nes_time_t t, nes_time_t* last_read = NULL ) const;
+	
+	// Time when next DMC memory read will occur
+	nes_time_t next_dmc_read_time() const;
+	
+	// Runs DMC until specified time, so that any DMC memory reads can be
+	// accounted for (i.e. inserting CPU wait states).
+	void run_until( nes_time_t );
+	
+
+// Implementation
+public:
+	Nes_Apu();
+	BLARGG_DISABLE_NOTHROW
+	// Use set_output() in place of these
+	BLARGG_DEPRECATED( void output    (        Blip_Buffer* c ); )
+	BLARGG_DEPRECATED( void osc_output( int i, Blip_Buffer* c ); )
+	
+	BLARGG_DEPRECATED_TEXT( enum { start_addr = 0x4000 }; )
+	BLARGG_DEPRECATED_TEXT( enum { end_addr   = 0x4017 }; )
+	
+	blargg_callback<int (*)( void* user_data, int addr )> dmc_reader;
+	blargg_callback<void (*)( void* user_data )> irq_notifier;
+
+	void enable_nonlinear_( double sq, double tnd );
+	static float tnd_total_() { return 196.015f; }
+	
+private:
+	friend struct Nes_Dmc;
+	
+	// noncopyable
+	Nes_Apu( const Nes_Apu& );
+	Nes_Apu& operator = ( const Nes_Apu& );
+	
+	Nes_Osc*            oscs [osc_count];
+	Nes_Square          square1;
+	Nes_Square          square2;
+	Nes_Noise           noise;
+	Nes_Triangle        triangle;
+	Nes_Dmc             dmc;
+	
+	double tempo_;
+	nes_time_t last_time; // has been run until this time in current frame
+	nes_time_t last_dmc_time;
+	nes_time_t earliest_irq_;
+	nes_time_t next_irq;
+	int frame_period;
+	int frame_delay; // cycles until frame counter runs next
+	int frame; // current frame (0-3)
+	int osc_enables;
+	int frame_mode;
+	bool irq_flag;
+	Nes_Square::Synth square_synth; // shared by squares
+	
+	void irq_changed();
+	void state_restored();
+	void run_until_( nes_time_t );
+	
+	// TODO: remove
+	friend class Nes_Core;
+};
+
+inline void Nes_Apu::set_output( int osc, Blip_Buffer* buf )
+{
+	assert( (unsigned) osc < osc_count );
+	oscs [osc]->output = buf;
+}
+
+inline Nes_Apu::nes_time_t Nes_Apu::earliest_irq( nes_time_t ) const
+{
+	return earliest_irq_;
+}
+
+inline int Nes_Apu::count_dmc_reads( nes_time_t time, nes_time_t* last_read ) const
+{
+	return dmc.count_reads( time, last_read );
+}
+	
+inline Nes_Apu::nes_time_t Nes_Dmc::next_read_time() const
+{
+	if ( length_counter == 0 )
+		return Nes_Apu::no_irq; // not reading
+	
+	return apu->last_dmc_time + delay + (bits_remain - 1) * period;
+}
+
+inline Nes_Apu::nes_time_t Nes_Apu::next_dmc_read_time() const { return dmc.next_read_time(); }
+
+BLARGG_DEPRECATED( typedef int      nes_time_t; ) // use your own typedef
+BLARGG_DEPRECATED( typedef unsigned nes_addr_t; ) // use your own typedef
+
+BLARGG_DEPRECATED_TEXT( inline void Nes_Apu::output    (        Blip_Buffer* c ) { set_output( c    ); } )
+BLARGG_DEPRECATED_TEXT( inline void Nes_Apu::osc_output( int i, Blip_Buffer* c ) { set_output( i, c ); } )
+
+#endif