124 lines
2.5 KiB
C++
124 lines
2.5 KiB
C++
// AY-3-8910 sound chip emulator
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// $package
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#ifndef AY_APU_H
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#define AY_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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class Ay_Apu {
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public:
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// Basics
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enum Ay_Apu_Type
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{
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Ay8910 = 0,
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Ay8912,
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Ay8913,
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Ay8914,
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Ym2149 = 0x10,
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Ym3439,
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Ymz284,
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Ymz294,
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Ym2203 = 0x20,
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Ym2608,
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Ym2610,
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Ym2610b
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};
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void set_type( Ay_Apu_Type type ) { type_ = type; }
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// Sets buffer to generate sound into, or 0 to mute.
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void set_output( Blip_Buffer* );
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// Writes to address register
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void write_addr( int data ) { addr_ = data & 0x0F; }
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// Emulates to time t, then writes to current data register
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void write_data( blip_time_t t, int data ) { run_until( t ); write_data_( addr_, data ); }
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// Emulates to time t, then subtracts t from the current time.
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// OK if previous write call had time slightly after t.
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void end_frame( blip_time_t t );
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// More features
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// Reads from current data register
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int read();
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// Resets sound chip
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void reset();
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// Number of registers
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enum { reg_count = 16 };
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// Same as set_output(), but for a particular channel
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enum { osc_count = 3 };
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void set_output( int chan, Blip_Buffer* );
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// Sets overall volume, where 1.0 is normal
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void volume( double v ) { synth_.volume( 0.7/osc_count/amp_range * v ); }
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// Sets treble equalization
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void treble_eq( blip_eq_t const& eq ) { synth_.treble_eq( eq ); }
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private:
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// noncopyable
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Ay_Apu( const Ay_Apu& );
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Ay_Apu& operator = ( const Ay_Apu& );
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// Implementation
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public:
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Ay_Apu();
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BLARGG_DISABLE_NOTHROW
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typedef BOOST::uint8_t byte;
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private:
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struct osc_t
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{
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blip_time_t period;
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blip_time_t delay;
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short last_amp;
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short phase;
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Blip_Buffer* output;
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} oscs [osc_count];
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Ay_Apu_Type type_;
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blip_time_t last_time;
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byte addr_;
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byte regs [reg_count];
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blip_time_t noise_delay;
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unsigned noise_lfsr;
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blip_time_t env_delay;
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byte const* env_wave;
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int env_pos;
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byte env_modes [8] [48]; // values already passed through volume table
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void write_data_( int addr, int data );
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void run_until( blip_time_t );
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public:
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enum { amp_range = 255 };
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Blip_Synth_Norm synth_; // used by Ay_Core for beeper sound
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};
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inline void Ay_Apu::set_output( int i, Blip_Buffer* out )
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{
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assert( (unsigned) i < osc_count );
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oscs [i].output = out;
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}
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inline void Ay_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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last_time -= time;
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assert( last_time >= 0 );
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}
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#endif
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