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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.
95 lines
2 KiB
C++
95 lines
2 KiB
C++
// Konami VRC6 sound chip emulator
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// Nes_Snd_Emu 0.1.8
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#ifndef NES_VRC6_APU_H
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#define NES_VRC6_APU_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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struct vrc6_apu_state_t;
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class Nes_Vrc6_Apu {
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public:
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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( blip_time_t );
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void save_state( vrc6_apu_state_t* ) const;
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void load_state( vrc6_apu_state_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( blip_time_t, int osc, int reg, int data );
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public:
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Nes_Vrc6_Apu();
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BLARGG_DISABLE_NOTHROW
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private:
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// noncopyable
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Nes_Vrc6_Apu( const Nes_Vrc6_Apu& );
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Nes_Vrc6_Apu& operator = ( const Nes_Vrc6_Apu& );
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struct Vrc6_Osc
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{
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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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blip_time_t last_time;
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Blip_Synth<blip_med_quality,1> saw_synth;
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Blip_Synth<blip_good_quality,1> square_synth;
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void run_until( blip_time_t );
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void run_square( Vrc6_Osc& osc, blip_time_t );
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void run_saw( blip_time_t );
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};
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struct vrc6_apu_state_t
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{
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uint8_t regs [3] [3];
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uint8_t saw_amp;
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uint16_t delays [3];
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uint8_t phases [3];
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uint8_t unused;
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};
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inline void Nes_Vrc6_Apu::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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inline void Nes_Vrc6_Apu::volume( double v )
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{
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double const factor = 0.0967 * 2;
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saw_synth.volume( factor / 31 * v );
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square_synth.volume( factor * 0.5 / 15 * v );
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}
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inline void Nes_Vrc6_Apu::treble_eq( blip_eq_t const& eq )
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{
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saw_synth.treble_eq( eq );
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square_synth.treble_eq( eq );
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}
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#endif
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