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