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83 lines
1.4 KiB
C
83 lines
1.4 KiB
C
// Private oscillators used by Gb_Apu
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// Gb_Snd_Emu 0.1.5
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#ifndef GB_OSCS_H
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#define GB_OSCS_H
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#include "blargg_common.h"
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#include "Blip_Buffer.h"
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struct Gb_Osc
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{
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enum { trigger = 0x80 };
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enum { len_enabled_mask = 0x40 };
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Blip_Buffer* outputs [4]; // NULL, right, left, center
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Blip_Buffer* output;
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int output_select;
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uint8_t* regs; // osc's 5 registers
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int delay;
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int last_amp;
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int volume;
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int length;
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int enabled;
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void reset();
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void clock_length();
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int frequency() const { return (regs [4] & 7) * 0x100 + regs [3]; }
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};
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struct Gb_Env : Gb_Osc
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{
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int env_delay;
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void reset();
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void clock_envelope();
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bool write_register( int, int );
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};
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struct Gb_Square : Gb_Env
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{
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enum { period_mask = 0x70 };
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enum { shift_mask = 0x07 };
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typedef Blip_Synth<blip_good_quality,1> Synth;
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Synth const* synth;
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int sweep_delay;
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int sweep_freq;
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int phase;
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void reset();
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void clock_sweep();
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void run( blip_time_t, blip_time_t, int playing );
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};
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struct Gb_Noise : Gb_Env
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{
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typedef Blip_Synth<blip_med_quality,1> Synth;
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Synth const* synth;
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unsigned bits;
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void run( blip_time_t, blip_time_t, int playing );
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};
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struct Gb_Wave : Gb_Osc
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{
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typedef Blip_Synth<blip_med_quality,1> Synth;
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Synth const* synth;
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int wave_pos;
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enum { wave_size = 32 };
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uint8_t wave [wave_size];
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void write_register( int, int );
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void run( blip_time_t, blip_time_t, int playing );
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};
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inline void Gb_Env::reset()
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{
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env_delay = 0;
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Gb_Osc::reset();
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}
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#endif
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