apps/codecs/libgme/nes_vrc7_apu.h

   1 // Konami VRC7 sound chip emulator
   2
   3 #ifndef NES_VRC7_APU_H
   4 #define NES_VRC7_APU_H
   5
   6 #include "blargg_common.h"
   7 #include "blip_buffer.h"
   8
   9 #include "emu2413.h"
  10
  11 enum { vrc7_osc_count = 6 };
  12
  13 struct vrc7_osc_t {
  14         struct Blip_Buffer* output;
  15         int last_amp;
  16 };
  17
  18 struct Nes_Vrc7_Apu {
  19         OPLL opll;
  20         int addr;
  21         blip_time_t next_time;
  22         struct vrc7_osc_t osc;
  23         struct Blip_Synth synth;
  24         e_uint32 mask;
  25 };
  26
  27 // See Nes_Apu.h for reference
  28 void Vrc7_init( struct Nes_Vrc7_Apu* this );
  29 void Vrc7_reset( struct Nes_Vrc7_Apu* this );
  30 void Vrc7_set_rate( struct Nes_Vrc7_Apu* this, double r );
  31 void Vrc7_end_frame( struct Nes_Vrc7_Apu* this, blip_time_t ) ICODE_ATTR;
  32
  33 void Vrc7_write_reg( struct Nes_Vrc7_Apu* this, int reg ) ICODE_ATTR;
  34 void Vrc7_write_data( struct Nes_Vrc7_Apu* this, blip_time_t, int data ) ICODE_ATTR;
  35
  36 void output_changed( struct Nes_Vrc7_Apu* this );
  37 static inline void Vrc7_set_output( struct Nes_Vrc7_Apu* this, int i, struct Blip_Buffer* buf )
  38 {
  39         assert( (unsigned) i < vrc7_osc_count );
  40         this->mask |= 1 << i;
  41
  42         // Will use OPLL_setMask to mute voices
  43         if ( buf ) {
  44                 this->mask ^= 1 << i;
  45                 this->osc.output = buf;
  46         }
  47 }
  48
  49 // DB2LIN_AMP_BITS == 11, * 2
  50 static inline void Vrc7_volume( struct Nes_Vrc7_Apu* this, double v ) { Synth_volume( &this->synth, 1.0 / 3 / 4096 * v ); }
  51
  52 #endif