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90 lines
2.5 KiB
C++
90 lines
2.5 KiB
C++
// Nintendo Game Boy PAPU sound chip emulator
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// Gb_Snd_Emu 0.1.5
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#ifndef GB_APU_H
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#define GB_APU_H
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#include "Gb_Oscs.h"
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class Gb_Apu {
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public:
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// Set overall volume of all oscillators, where 1.0 is full volume
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void volume( double );
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// Set treble equalization
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void treble_eq( const blip_eq_t& );
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// Outputs can be assigned to a single buffer for mono output, or to three
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// buffers for stereo output (using Stereo_Buffer to do the mixing).
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// Assign all oscillator outputs to specified buffer(s). If buffer
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// is NULL, silences all oscillators.
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void output( Blip_Buffer* mono );
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void output( Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
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// Assign single oscillator output to buffer(s). Valid indicies are 0 to 3,
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// which refer to Square 1, Square 2, Wave, and Noise. If buffer is NULL,
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// silences oscillator.
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enum { osc_count = 4 };
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void osc_output( int index, Blip_Buffer* mono );
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void osc_output( int index, Blip_Buffer* center, Blip_Buffer* left, Blip_Buffer* right );
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// Reset oscillators and internal state
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void reset();
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// Reads and writes at addr must satisfy start_addr <= addr <= end_addr
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enum { start_addr = 0xFF10 };
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enum { end_addr = 0xFF3F };
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enum { register_count = end_addr - start_addr + 1 };
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// Write 'data' to address at specified time
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void write_register( blip_time_t, unsigned addr, int data );
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// Read from address at specified time
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int read_register( blip_time_t, unsigned addr );
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// Run all oscillators up to specified time, end current time frame, then
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// start a new frame at time 0.
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void end_frame( blip_time_t );
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void set_tempo( double );
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public:
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Gb_Apu();
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private:
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// noncopyable
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Gb_Apu( const Gb_Apu& );
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Gb_Apu& operator = ( const Gb_Apu& );
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Gb_Osc* oscs [osc_count];
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blip_time_t next_frame_time;
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blip_time_t last_time;
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blip_time_t frame_period;
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double volume_unit;
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int frame_count;
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Gb_Square square1;
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Gb_Square square2;
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Gb_Wave wave;
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Gb_Noise noise;
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uint8_t regs [register_count];
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Gb_Square::Synth square_synth; // used by squares
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Gb_Wave::Synth other_synth; // used by wave and noise
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void update_volume();
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void run_until( blip_time_t );
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void write_osc( int index, int reg, int data );
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};
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inline void Gb_Apu::output( Blip_Buffer* b ) { output( b, b, b ); }
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inline void Gb_Apu::osc_output( int i, Blip_Buffer* b ) { osc_output( i, b, b, b ); }
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inline void Gb_Apu::volume( double vol )
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{
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volume_unit = 0.60 / osc_count / 15 /*steps*/ / 2 /*?*/ / 8 /*master vol range*/ * vol;
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update_volume();
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}
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#endif
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