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131 lines
2.7 KiB
C++
131 lines
2.7 KiB
C++
// Sunsoft FME-7 sound emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef NES_FME7_APU_H
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#define NES_FME7_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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struct fme7_apu_state_t
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{
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enum { reg_count = 14 };
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uint8_t regs [reg_count];
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uint8_t phases [3]; // 0 or 1
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uint8_t latch;
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uint16_t delays [3]; // a, b, c
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};
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class Nes_Fme7_Apu : private fme7_apu_state_t {
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public:
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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 output( Blip_Buffer* );
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enum { osc_count = 3 };
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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_state( fme7_apu_state_t* ) const;
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void load_state( fme7_apu_state_t const& );
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// Mask and addresses of registers
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enum { addr_mask = 0xE000 };
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enum { data_addr = 0xE000 };
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enum { latch_addr = 0xC000 };
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// (addr & addr_mask) == latch_addr
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void write_latch( int );
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// (addr & addr_mask) == data_addr
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void write_data( blip_time_t, int data );
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public:
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Nes_Fme7_Apu();
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BLARGG_DISABLE_NOTHROW
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private:
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// noncopyable
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Nes_Fme7_Apu( const Nes_Fme7_Apu& );
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Nes_Fme7_Apu& operator = ( const Nes_Fme7_Apu& );
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static unsigned char const amp_table [16];
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struct {
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Blip_Buffer* output;
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int last_amp;
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} oscs [osc_count];
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blip_time_t last_time;
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enum { amp_range = 192 }; // can be any value; this gives best error/quality tradeoff
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Blip_Synth<blip_good_quality,1> synth;
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void run_until( blip_time_t );
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};
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inline void Nes_Fme7_Apu::volume( double v )
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{
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synth.volume( 0.38 / amp_range * v ); // to do: fine-tune
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}
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inline void Nes_Fme7_Apu::treble_eq( blip_eq_t const& eq )
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{
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synth.treble_eq( eq );
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}
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inline void Nes_Fme7_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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}
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inline void Nes_Fme7_Apu::output( Blip_Buffer* buf )
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{
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for ( int i = 0; i < osc_count; i++ )
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osc_output( i, buf );
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}
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inline Nes_Fme7_Apu::Nes_Fme7_Apu()
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{
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output( NULL );
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volume( 1.0 );
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reset();
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}
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inline void Nes_Fme7_Apu::write_latch( int data ) { latch = data; }
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inline void Nes_Fme7_Apu::write_data( blip_time_t time, int data )
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{
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if ( (unsigned) latch >= reg_count )
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{
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#ifdef debug_printf
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debug_printf( "FME7 write to %02X (past end of sound registers)\n", (int) latch );
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#endif
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return;
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}
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run_until( time );
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regs [latch] = data;
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}
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inline void Nes_Fme7_Apu::end_frame( blip_time_t time )
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{
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if ( time > last_time )
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run_until( time );
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assert( last_time >= time );
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last_time -= time;
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}
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inline void Nes_Fme7_Apu::save_state( fme7_apu_state_t* out ) const
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{
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*out = *this;
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}
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inline void Nes_Fme7_Apu::load_state( fme7_apu_state_t const& in )
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{
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reset();
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fme7_apu_state_t* state = this;
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*state = in;
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}
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#endif
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