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// Konami VRC7 sound chip emulator
#ifndef NES_VRC7_APU_H
#define NES_VRC7_APU_H
#include "blargg_common.h"
#include "blip_buffer.h"
#include "emu2413.h"
enum { vrc7_osc_count = 6 };
struct vrc7_osc_t {
struct Blip_Buffer* output;
int last_amp;
};
struct Nes_Vrc7_Apu {
OPLL opll;
int addr;
blip_time_t next_time;
struct vrc7_osc_t osc;
struct Blip_Synth synth;
e_uint32 mask;
};
// See Nes_Apu.h for reference
void Vrc7_init( struct Nes_Vrc7_Apu* this );
void Vrc7_reset( struct Nes_Vrc7_Apu* this );
void Vrc7_set_rate( struct Nes_Vrc7_Apu* this, int r );
void Vrc7_end_frame( struct Nes_Vrc7_Apu* this, blip_time_t );
void Vrc7_write_reg( struct Nes_Vrc7_Apu* this, int reg );
void Vrc7_write_data( struct Nes_Vrc7_Apu* this, blip_time_t, int data );
void output_changed( struct Nes_Vrc7_Apu* this );
static inline void Vrc7_set_output( struct Nes_Vrc7_Apu* this, int i, struct Blip_Buffer* buf )
{
assert( (unsigned) i < vrc7_osc_count );
this->mask |= 1 << i;
// Will use OPLL_setMask to mute voices
if ( buf ) {
this->mask ^= 1 << i;
this->osc.output = buf;
}
}
// DB2LIN_AMP_BITS == 11, * 2
static inline void Vrc7_volume( struct Nes_Vrc7_Apu* this, int v ) { Synth_volume( &this->synth, v / 3 / 4096 ); }
#endif
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