// Namco 106 sound chip emulator // Nes_Snd_Emu 0.1.8 #ifndef NES_NAMCO_APU_H #define NES_NAMCO_APU_H #include "blargg_common.h" #include "Blip_Buffer.h" struct namco_state_t; class Nes_Namco_Apu { public: // 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( blip_time_t ); // Read/write data register is at 0x4800 enum { data_reg_addr = 0x4800 }; void write_data( blip_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_state( namco_state_t* out ) const; void load_state( namco_state_t const& ); public: Nes_Namco_Apu(); BLARGG_DISABLE_NOTHROW private: // noncopyable Nes_Namco_Apu( const Nes_Namco_Apu& ); Nes_Namco_Apu& operator = ( const Nes_Namco_Apu& ); struct Namco_Osc { blargg_long delay; Blip_Buffer* output; short last_amp; short wave_pos; }; Namco_Osc oscs [osc_count]; blip_time_t last_time; int addr_reg; enum { reg_count = 0x80 }; uint8_t reg [reg_count]; Blip_Synth<blip_good_quality,15> synth; uint8_t& access(); void run_until( blip_time_t ); }; /* struct namco_state_t { uint8_t regs [0x80]; uint8_t addr; uint8_t unused; uint8_t positions [8]; uint32_t delays [8]; }; */ inline uint8_t& Nes_Namco_Apu::access() { int addr = addr_reg & 0x7F; if ( addr_reg & 0x80 ) addr_reg = (addr + 1) | 0x80; return reg [addr]; } inline void Nes_Namco_Apu::volume( double v ) { synth.volume( 0.10 / osc_count * v ); } inline void Nes_Namco_Apu::treble_eq( const blip_eq_t& eq ) { synth.treble_eq( eq ); } inline void Nes_Namco_Apu::write_addr( int v ) { addr_reg = v; } inline int Nes_Namco_Apu::read_data() { return access(); } inline void Nes_Namco_Apu::osc_output( int i, Blip_Buffer* buf ) { assert( (unsigned) i < osc_count ); oscs [i].output = buf; } inline void Nes_Namco_Apu::write_data( blip_time_t time, int data ) { run_until( time ); access() = data; } #endif