105 lines
2.1 KiB
C++
105 lines
2.1 KiB
C++
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// Namco 106 sound chip emulator
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// Nes_Snd_Emu 0.1.7
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#ifndef NES_NAMCO_APU_H
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#define NES_NAMCO_APU_H
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#include <stdint.h>
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#include "Nes_Apu.h"
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struct namco_state_t;
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class Nes_Namco_Apu {
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public:
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Nes_Namco_Apu();
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~Nes_Namco_Apu();
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// See Nes_Apu.h for reference.
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void volume( double );
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void treble_eq( const blip_eq_t& );
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void output( Blip_Buffer* );
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enum { osc_count = 8 };
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void osc_output( int index, Blip_Buffer* );
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void reset();
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void end_frame( nes_time_t );
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// Read/write data register is at 0x4800
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enum { data_reg_addr = 0x4800 };
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void write_data( nes_time_t, int );
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int read_data();
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// Write-only address register is at 0xF800
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enum { addr_reg_addr = 0xF800 };
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void write_addr( int );
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// to do: implement save/restore
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void save_state( namco_state_t* out ) const;
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void load_state( namco_state_t const& );
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private:
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// noncopyable
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Nes_Namco_Apu( const Nes_Namco_Apu& );
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Nes_Namco_Apu& operator = ( const Nes_Namco_Apu& );
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struct Namco_Osc {
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long delay;
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Blip_Buffer* output;
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short last_amp;
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short wave_pos;
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};
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Namco_Osc oscs [osc_count];
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nes_time_t last_time;
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int addr_reg;
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enum { reg_count = 0x80 };
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uint8_t reg [reg_count];
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Blip_Synth<blip_good_quality,15> synth;
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uint8_t& access();
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void run_until( nes_time_t );
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};
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struct namco_state_t
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{
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uint8_t regs [0x80];
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uint8_t addr;
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uint8_t unused;
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uint8_t positions [8];
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uint32_t delays [8];
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};
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BOOST_STATIC_ASSERT( sizeof (namco_state_t) == 172 );
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inline uint8_t& Nes_Namco_Apu::access()
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{
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int addr = addr_reg & 0x7f;
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if ( addr_reg & 0x80 )
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addr_reg = (addr + 1) | 0x80;
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return reg [addr];
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}
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inline void Nes_Namco_Apu::volume( double v ) { synth.volume( 0.10 / osc_count * v ); }
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inline void Nes_Namco_Apu::treble_eq( const blip_eq_t& eq ) { synth.treble_eq( eq ); }
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inline void Nes_Namco_Apu::write_addr( int v ) { addr_reg = v; }
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inline int Nes_Namco_Apu::read_data() { return access(); }
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inline void Nes_Namco_Apu::osc_output( int i, Blip_Buffer* buf )
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{
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oscs [i].output = buf;
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}
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inline void Nes_Namco_Apu::write_data( nes_time_t time, int data )
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{
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run_until( time );
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access() = data;
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}
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#endif
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