53 lines
1.3 KiB
C
53 lines
1.3 KiB
C
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// Konami VRC7 sound chip emulator
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#ifndef NES_VRC7_APU_H
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#define NES_VRC7_APU_H
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#include "blargg_common.h"
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#include "blip_buffer.h"
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#include "emu2413.h"
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enum { vrc7_osc_count = 6 };
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struct vrc7_osc_t {
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struct Blip_Buffer* output;
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int last_amp;
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};
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struct Nes_Vrc7_Apu {
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OPLL opll;
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int addr;
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blip_time_t next_time;
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struct vrc7_osc_t osc;
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struct Blip_Synth synth;
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e_uint32 mask;
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};
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// See Nes_Apu.h for reference
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void Vrc7_init( struct Nes_Vrc7_Apu* this );
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void Vrc7_reset( struct Nes_Vrc7_Apu* this );
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void Vrc7_set_rate( struct Nes_Vrc7_Apu* this, double r );
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void Vrc7_end_frame( struct Nes_Vrc7_Apu* this, blip_time_t ) ICODE_ATTR;
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void Vrc7_write_reg( struct Nes_Vrc7_Apu* this, int reg ) ICODE_ATTR;
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void Vrc7_write_data( struct Nes_Vrc7_Apu* this, blip_time_t, int data ) ICODE_ATTR;
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void output_changed( struct Nes_Vrc7_Apu* this );
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static inline void Vrc7_set_output( struct Nes_Vrc7_Apu* this, int i, struct Blip_Buffer* buf )
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{
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assert( (unsigned) i < vrc7_osc_count );
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this->mask |= 1 << i;
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// Will use OPLL_setMask to mute voices
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if ( buf ) {
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this->mask ^= 1 << i;
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this->osc.output = buf;
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}
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}
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// DB2LIN_AMP_BITS == 11, * 2
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static inline void Vrc7_volume( struct Nes_Vrc7_Apu* this, double v ) { Synth_volume( &this->synth, 1.0 / 3 / 4096 * v ); }
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#endif
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