72 lines
1.9 KiB
C
72 lines
1.9 KiB
C
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// Namco 106 sound chip emulator
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// Nes_Snd_Emu 0.1.8
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#ifndef NES_NAMCO_APU_H
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#define NES_NAMCO_APU_H
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#include "blargg_common.h"
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#include "blip_buffer.h"
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struct namco_state_t;
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enum { namco_osc_count = 8 };
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enum { namco_addr_reg_addr = 0xF800 };
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enum { namco_data_reg_addr = 0x4800 };
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enum { namco_reg_count = 0x80 };
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struct Namco_Osc {
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blargg_long delay;
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struct Blip_Buffer* output;
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short last_amp;
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short wave_pos;
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};
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struct Nes_Namco_Apu {
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struct Namco_Osc oscs [namco_osc_count];
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blip_time_t last_time;
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int addr_reg;
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uint8_t reg [namco_reg_count];
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struct Blip_Synth synth;
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};
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// See Nes_Apu.h for reference.
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void Namco_init( struct Nes_Namco_Apu* this );
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void Namco_output( struct Nes_Namco_Apu* this, struct Blip_Buffer* );
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void Namco_reset( struct Nes_Namco_Apu* this );
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void Namco_end_frame( struct Nes_Namco_Apu* this, blip_time_t ) ICODE_ATTR;
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static inline uint8_t* namco_access( struct Nes_Namco_Apu* this )
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{
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int addr = this->addr_reg & 0x7F;
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if ( this->addr_reg & 0x80 )
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this->addr_reg = (addr + 1) | 0x80;
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return &this->reg [addr];
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}
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static inline void Namco_volume( struct Nes_Namco_Apu* this, double v ) { Synth_volume( &this->synth, 0.10 / namco_osc_count * v / 15.0 ); }
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// Write-only address register is at 0xF800
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static inline void Namco_write_addr( struct Nes_Namco_Apu* this, int v ) { this->addr_reg = v; }
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static inline int Namco_read_data( struct Nes_Namco_Apu* this ) { return *namco_access( this ); }
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static inline void Namco_osc_output( struct Nes_Namco_Apu* this, int i, struct Blip_Buffer* buf )
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{
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assert( (unsigned) i < namco_osc_count );
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this->oscs [i].output = buf;
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}
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// Read/write data register is at 0x4800
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void Namco_run_until( struct Nes_Namco_Apu* this, blip_time_t ) ICODE_ATTR;
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static inline void Namco_write_data( struct Nes_Namco_Apu* this, blip_time_t time, int data )
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{
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Namco_run_until( this, time );
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*namco_access( this ) = data;
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}
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#endif
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