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718112a8fe
Currently none of these is being used, but eventually they will, once more code gets ported over. So it's better to have them right away and avoid editing the project file too much, only to revert that later.
106 lines
2.3 KiB
C++
106 lines
2.3 KiB
C++
// Konami SCC sound chip emulator
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// Game_Music_Emu https://bitbucket.org/mpyne/game-music-emu/
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#ifndef KSS_SCC_APU_H
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#define KSS_SCC_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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#include <string.h>
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class Scc_Apu {
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public:
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// Set buffer to generate all sound into, or disable sound if NULL
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void output( Blip_Buffer* );
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// Reset sound chip
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void reset();
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// Write to register at specified time
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enum { reg_count = 0x90 };
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void write( blip_time_t time, int reg, int data );
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// Run sound to specified time, end current time frame, then start a new
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// time frame at time 0. Time frames have no effect on emulation and each
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// can be whatever length is convenient.
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void end_frame( blip_time_t length );
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// Additional features
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// Set sound output of specific oscillator to buffer, where index is
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// 0 to 4. If buffer is NULL, the specified oscillator is muted.
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enum { osc_count = 5 };
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void osc_output( int index, Blip_Buffer* );
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// Set overall volume (default is 1.0)
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void volume( double );
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// Set treble equalization (see documentation)
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void treble_eq( blip_eq_t const& );
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public:
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Scc_Apu();
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private:
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enum { amp_range = 0x8000 };
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struct osc_t
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{
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int delay;
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int phase;
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int last_amp;
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Blip_Buffer* output;
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};
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osc_t oscs [osc_count];
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blip_time_t last_time;
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unsigned char regs [reg_count];
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Blip_Synth<blip_med_quality,1> synth;
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void run_until( blip_time_t );
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};
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inline void Scc_Apu::volume( double v ) { synth.volume( 0.43 / osc_count / amp_range * v ); }
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inline void Scc_Apu::treble_eq( blip_eq_t const& eq ) { synth.treble_eq( eq ); }
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inline void Scc_Apu::osc_output( int index, Blip_Buffer* b )
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{
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assert( (unsigned) index < osc_count );
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oscs [index].output = b;
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}
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inline void Scc_Apu::write( blip_time_t time, int addr, int data )
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{
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assert( (unsigned) addr < reg_count );
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run_until( time );
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regs [addr] = data;
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}
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inline void Scc_Apu::end_frame( blip_time_t end_time )
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{
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if ( end_time > last_time )
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run_until( end_time );
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last_time -= end_time;
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assert( last_time >= 0 );
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}
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inline void Scc_Apu::output( Blip_Buffer* buf )
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{
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for ( int i = 0; i < osc_count; i++ )
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oscs [i].output = buf;
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}
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inline Scc_Apu::Scc_Apu()
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{
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output( 0 );
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}
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inline void Scc_Apu::reset()
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{
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last_time = 0;
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for ( int i = 0; i < osc_count; i++ )
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memset( &oscs [i], 0, offsetof (osc_t,output) );
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memset( regs, 0, sizeof regs );
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}
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#endif
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