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76 lines
2 KiB
C
76 lines
2 KiB
C
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// Sega Master System SN76489 PSG sound chip emulator
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// Sms_Snd_Emu 0.1.4
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#ifndef SMS_APU_H
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#define SMS_APU_H
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#include "Sms_Oscs.h"
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class Sms_Apu {
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public:
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// Set overall volume of all oscillators, where 1.0 is full volume
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void volume( double );
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// Set treble equalization
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void treble_eq( const blip_eq_t& );
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// Outputs can be assigned to a single buffer for mono output, or to three
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// buffers for stereo output (using Stereo_Buffer to do the mixing).
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// Assign all oscillator outputs to specified buffer(s). If buffer
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// is NULL, silences all oscillators.
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void output( Blip_Buffer* mono );
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void output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
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// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
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// which refer to Square 1, Square 2, Square 3, and Noise. If buffer is NULL,
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// silences oscillator.
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enum { osc_count = 4 };
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void osc_output( int index, Blip_Buffer* mono );
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void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
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// Reset oscillators and internal state
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void reset( unsigned noise_feedback = 0, int noise_width = 0 );
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// Write GameGear left/right assignment byte
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void write_ggstereo( blip_time_t, int );
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// Write to data port
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void write_data( blip_time_t, int );
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// Run all oscillators up to specified time, end current frame, then
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// start a new frame at time 0.
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void end_frame( blip_time_t );
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public:
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Sms_Apu();
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~Sms_Apu();
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private:
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// noncopyable
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Sms_Apu( const Sms_Apu& );
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Sms_Apu& operator = ( const Sms_Apu& );
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Sms_Osc* oscs [osc_count];
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Sms_Square squares [3];
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Sms_Square::Synth square_synth; // used by squares
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blip_time_t last_time;
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int latch;
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Sms_Noise noise;
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unsigned noise_feedback;
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unsigned looped_feedback;
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void run_until( blip_time_t );
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};
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struct sms_apu_state_t
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{
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unsigned char regs [8] [2];
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unsigned char latch;
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};
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inline void Sms_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
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inline void Sms_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
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#endif
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