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67 lines
1.4 KiB
C
67 lines
1.4 KiB
C
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// Turbo Grafx 16 (PC Engine) PSG sound chip emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef HES_APU_H
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#define HES_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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struct Hes_Osc
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{
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unsigned char wave [32];
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short volume [2];
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int last_amp [2];
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int delay;
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int period;
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unsigned char noise;
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unsigned char phase;
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unsigned char balance;
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unsigned char dac;
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blip_time_t last_time;
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Blip_Buffer* outputs [2];
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Blip_Buffer* chans [3];
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unsigned noise_lfsr;
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unsigned char control;
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enum { amp_range = 0x8000 };
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typedef Blip_Synth<blip_med_quality,1> synth_t;
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void run_until( synth_t& synth, blip_time_t );
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};
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class Hes_Apu {
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public:
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void treble_eq( blip_eq_t const& );
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void volume( double );
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enum { osc_count = 6 };
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void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
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void reset();
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enum { start_addr = 0x0800 };
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enum { end_addr = 0x0809 };
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void write_data( blip_time_t, int addr, int data );
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void end_frame( blip_time_t );
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public:
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Hes_Apu();
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private:
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Hes_Osc oscs [osc_count];
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int latch;
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int balance;
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Hes_Osc::synth_t synth;
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void balance_changed( Hes_Osc& );
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void recalc_chans();
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};
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inline void Hes_Apu::volume( double v ) { synth.volume( 1.8 / osc_count / Hes_Osc::amp_range * v ); }
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inline void Hes_Apu::treble_eq( blip_eq_t const& eq ) { synth.treble_eq( eq ); }
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#endif
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