56 lines
1.4 KiB
C
56 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 0.5.2
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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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enum { amp_range = 0x8000 };
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enum { osc_count = 6 };
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enum { start_addr = 0x0800 };
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enum { end_addr = 0x0809 };
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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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struct Blip_Buffer* outputs [2];
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struct Blip_Buffer* chans [3];
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unsigned noise_lfsr;
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unsigned char control;
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};
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void Osc_run_until( struct Hes_Osc* this, struct Blip_Synth* synth, blip_time_t ) ICODE_ATTR;
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struct Hes_Apu {
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struct Hes_Osc oscs [osc_count];
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int latch;
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int balance;
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struct Blip_Synth synth;
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};
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// Init HES apu sound chip
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void Apu_init( struct Hes_Apu* this );
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// Reset HES apu couns chip
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void Apu_reset( struct Hes_Apu* this );
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void Apu_osc_output( struct Hes_Apu* this, int index, struct Blip_Buffer* center, struct Blip_Buffer* left, struct Blip_Buffer* right ) ICODE_ATTR;
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void Apu_write_data( struct Hes_Apu* this, blip_time_t, int addr, int data ) ICODE_ATTR;
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void Apu_end_frame( struct Hes_Apu* this, blip_time_t ) ICODE_ATTR;
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static inline void Apu_volume( struct Hes_Apu* this, double v ) { Synth_volume( &this->synth, 1.8 / osc_count / amp_range * v ); }
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#endif
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