apps/codecs/libgme/hes_apu.h

   1 // Turbo Grafx 16 (PC Engine) PSG sound chip emulator
   2
   3 // Game_Music_Emu 0.5.2
   4 #ifndef HES_APU_H
   5 #define HES_APU_H
   6
   7 #include "blargg_common.h"
   8 #include "blip_buffer.h"
   9
  10 enum { amp_range = 0x8000 };
  11 enum { osc_count = 6 };
  12 enum { start_addr = 0x0800 };
  13 enum { end_addr   = 0x0809 };
  14
  15 struct Hes_Osc
  16 {
  17         unsigned char wave [32];
  18         short volume [2];
  19         int last_amp [2];
  20         int delay;
  21         int period;
  22         unsigned char noise;
  23         unsigned char phase;
  24         unsigned char balance;
  25         unsigned char dac;
  26         blip_time_t last_time;
  27
  28         struct Blip_Buffer* outputs [2];
  29         struct Blip_Buffer* chans [3];
  30         unsigned noise_lfsr;
  31         unsigned char control;
  32 };
  33
  34 void Osc_run_until( struct Hes_Osc* this, struct Blip_Synth* synth, blip_time_t ) ICODE_ATTR;
  35
  36 struct Hes_Apu {
  37         struct Hes_Osc oscs [osc_count];
  38
  39         int latch;
  40         int balance;
  41         struct Blip_Synth synth;
  42 };
  43
  44 // Init HES apu sound chip
  45 void Apu_init( struct Hes_Apu* this );
  46
  47 // Reset HES apu couns chip
  48 void Apu_reset( struct Hes_Apu* this );
  49
  50 void Apu_osc_output( struct Hes_Apu* this, int index, struct Blip_Buffer* center, struct Blip_Buffer* left, struct Blip_Buffer* right ) ICODE_ATTR;
  51 void Apu_write_data( struct Hes_Apu* this, blip_time_t, int addr, int data ) ICODE_ATTR;
  52 void Apu_end_frame( struct Hes_Apu* this, blip_time_t ) ICODE_ATTR;
  53
  54 static inline void Apu_volume( struct Hes_Apu* this, double v ) { Synth_volume( &this->synth, 1.8 / osc_count / amp_range * v ); }
  55 #endif