85 lines
1.7 KiB
C++
85 lines
1.7 KiB
C++
// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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// Konami VRC7 sound chip emulator
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#ifndef NES_VRC7_APU_H
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#define NES_VRC7_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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struct vrc7_snapshot_t;
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class Nes_Vrc7_Apu {
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public:
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blargg_err_t init();
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// See Nes_Apu.h for reference
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void reset();
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void volume( double );
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void treble_eq( blip_eq_t const& );
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void set_output( Blip_Buffer* );
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enum { osc_count = 6 };
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void osc_output( int index, Blip_Buffer* );
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void end_frame( blip_time_t );
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void save_snapshot( vrc7_snapshot_t* ) const;
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void load_snapshot( vrc7_snapshot_t const& );
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void write_reg( int reg );
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void write_data( blip_time_t, int data );
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public:
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Nes_Vrc7_Apu();
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~Nes_Vrc7_Apu();
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BLARGG_DISABLE_NOTHROW
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private:
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// noncopyable
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Nes_Vrc7_Apu( const Nes_Vrc7_Apu& );
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Nes_Vrc7_Apu& operator = ( const Nes_Vrc7_Apu& );
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struct Vrc7_Osc
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{
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uint8_t regs [3];
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Blip_Buffer* output;
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int last_amp;
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};
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Vrc7_Osc oscs [osc_count];
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uint8_t kon;
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uint8_t inst [8];
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void* opll;
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int addr;
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blip_time_t next_time;
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struct {
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Blip_Buffer* output;
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int last_amp;
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} mono;
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Blip_Synth<blip_med_quality,1> synth;
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void run_until( blip_time_t );
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void output_changed();
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};
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struct vrc7_snapshot_t
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{
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uint8_t latch;
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uint8_t inst [8];
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uint8_t regs [6] [3];
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uint8_t delay;
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};
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inline void Nes_Vrc7_Apu::osc_output( int i, Blip_Buffer* buf )
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{
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assert( (unsigned) i < osc_count );
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oscs [i].output = buf;
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output_changed();
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}
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// DB2LIN_AMP_BITS == 11, * 2
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inline void Nes_Vrc7_Apu::volume( double v ) { synth.volume( 1.0 / 3 / 4096 * v ); }
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inline void Nes_Vrc7_Apu::treble_eq( blip_eq_t const& eq ) { synth.treble_eq( eq ); }
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#endif
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