85 lines
1.8 KiB
C++
85 lines
1.8 KiB
C++
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// Konami VRC6 sound chip emulator
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// Nes_Snd_Emu 0.1.7. Copyright (C) 2003-2005 Shay Green. GNU LGPL license.
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#ifndef NES_VRC6_H
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#define NES_VRC6_H
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#include "Nes_Apu.h"
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struct vrc6_snapshot_t;
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class Nes_Vrc6 {
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public:
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Nes_Vrc6();
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~Nes_Vrc6();
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// See Nes_Apu.h for reference
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void reset();
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void volume( double );
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void treble_eq( blip_eq_t const& );
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void output( Blip_Buffer* );
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enum { osc_count = 3 };
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void osc_output( int index, Blip_Buffer* );
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void end_frame( cpu_time_t );
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void save_snapshot( vrc6_snapshot_t* ) const;
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void load_snapshot( vrc6_snapshot_t const& );
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// Oscillator 0 write-only registers are at $9000-$9002
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// Oscillator 1 write-only registers are at $A000-$A002
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// Oscillator 2 write-only registers are at $B000-$B002
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enum { reg_count = 3 };
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enum { base_addr = 0x9000 };
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enum { addr_step = 0x1000 };
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void write_osc( cpu_time_t, int osc, int reg, int data );
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private:
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// noncopyable
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Nes_Vrc6( const Nes_Vrc6& );
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Nes_Vrc6& operator = ( const Nes_Vrc6& );
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struct Vrc6_Osc
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{
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BOOST::uint8_t regs [3];
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Blip_Buffer* output;
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int delay;
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int last_amp;
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int phase;
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int amp; // only used by saw
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int period() const
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{
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return (regs [2] & 0x0f) * 0x100L + regs [1] + 1;
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}
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};
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Vrc6_Osc oscs [osc_count];
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cpu_time_t last_time;
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Blip_Synth<blip_med_quality,31> saw_synth;
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Blip_Synth<blip_good_quality,15> square_synth;
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void run_until( cpu_time_t );
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void run_square( Vrc6_Osc& osc, cpu_time_t );
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void run_saw( cpu_time_t );
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};
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struct vrc6_snapshot_t
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{
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BOOST::uint8_t regs [3] [3];
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BOOST::uint8_t saw_amp;
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BOOST::uint16_t delays [3];
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BOOST::uint8_t phases [3];
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BOOST::uint8_t unused;
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};
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BOOST_STATIC_ASSERT( sizeof (vrc6_snapshot_t) == 20 );
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inline void Nes_Vrc6::osc_output( int i, Blip_Buffer* buf )
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{
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assert( (unsigned) i < osc_count );
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oscs [i].output = buf;
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}
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#endif
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