// Namco 106 sound chip emulator

// Nes_Snd_Emu 0.1.7. Copyright (C) 2003-2005 Shay Green. GNU LGPL license.

#ifndef NES_NAMCO_H
#define NES_NAMCO_H

#include "Nes_Apu.h"

struct namco_snapshot_t;

class Nes_Namco {
public:
	Nes_Namco();
	~Nes_Namco();
	
	// See Nes_Apu.h for reference.
	void volume( double );
	void treble_eq( const blip_eq_t& );
	void output( Blip_Buffer* );
	enum { osc_count = 8 };
	void osc_output( int index, Blip_Buffer* );
	void reset();
	void end_frame( cpu_time_t );
	
	// Read/write data register is at 0x4800
	enum { data_reg_addr = 0x4800 };
	void write_data( cpu_time_t, int );
	int read_data();
	
	// Write-only address register is at 0xF800
	enum { addr_reg_addr = 0xF800 };
	void write_addr( int );
	
	// to do: implement save/restore
	void save_snapshot( namco_snapshot_t* out );
	void load_snapshot( namco_snapshot_t const& );
	
private:
	// noncopyable
	Nes_Namco( const Nes_Namco& );
	Nes_Namco& operator = ( const Nes_Namco& );
	
	struct Namco_Osc {
		long delay;
		Blip_Buffer* output;
		short last_amp;
		short wave_pos;
	};
	
	Namco_Osc oscs [osc_count];
	
	cpu_time_t last_time;
	int addr_reg;
	
	enum { reg_count = 0x80 };
	BOOST::uint8_t reg [reg_count];
	Blip_Synth<blip_good_quality,15> synth;
	
	BOOST::uint8_t& access();
	void run_until( cpu_time_t );
};

inline void Nes_Namco::volume( double v ) { synth.volume( 0.10 / osc_count * v ); }

inline void Nes_Namco::treble_eq( const blip_eq_t& eq ) { synth.treble_eq( eq ); }

inline void Nes_Namco::write_addr( int v ) { addr_reg = v; }

inline int Nes_Namco::read_data() { return access(); }

inline void Nes_Namco::osc_output( int i, Blip_Buffer* buf )
{
	assert( (unsigned) i < osc_count );
	oscs [i].output = buf;
}

inline void Nes_Namco::write_data( cpu_time_t time, int data )
{
	run_until( time );
	access() = data;
}

#endif