// Private oscillators used by Nes_Apu // Nes_Snd_Emu 0.1.8 #ifndef NES_OSCS_H #define NES_OSCS_H #include "blargg_common.h" #include "Blip_Buffer.h" class Nes_Apu; struct Nes_Osc { unsigned char regs [4]; bool reg_written [4]; Blip_Buffer* output; int length_counter;// length counter (0 if unused by oscillator) int delay; // delay until next (potential) transition int last_amp; // last amplitude oscillator was outputting void clock_length( int halt_mask ); int period() const { return (regs [3] & 7) * 0x100 + (regs [2] & 0xFF); } void reset() { delay = 0; last_amp = 0; } int update_amp( int amp ) { int delta = amp - last_amp; last_amp = amp; return delta; } }; struct Nes_Envelope : Nes_Osc { int envelope; int env_delay; void clock_envelope(); int volume() const; void reset() { envelope = 0; env_delay = 0; Nes_Osc::reset(); } }; // Nes_Square struct Nes_Square : Nes_Envelope { enum { negate_flag = 0x08 }; enum { shift_mask = 0x07 }; enum { phase_range = 8 }; int phase; int sweep_delay; typedef Blip_Synth<blip_good_quality,1> Synth; Synth const& synth; // shared between squares Nes_Square( Synth const* s ) : synth( *s ) { } void clock_sweep( int adjust ); void run( nes_time_t, nes_time_t ); void reset() { sweep_delay = 0; Nes_Envelope::reset(); } nes_time_t maintain_phase( nes_time_t time, nes_time_t end_time, nes_time_t timer_period ); }; // Nes_Triangle struct Nes_Triangle : Nes_Osc { enum { phase_range = 16 }; int phase; int linear_counter; Blip_Synth<blip_med_quality,1> synth; int calc_amp() const; void run( nes_time_t, nes_time_t ); void clock_linear_counter(); void reset() { linear_counter = 0; phase = 1; Nes_Osc::reset(); } nes_time_t maintain_phase( nes_time_t time, nes_time_t end_time, nes_time_t timer_period ); }; // Nes_Noise struct Nes_Noise : Nes_Envelope { int noise; Blip_Synth<blip_med_quality,1> synth; void run( nes_time_t, nes_time_t ); void reset() { noise = 1 << 14; Nes_Envelope::reset(); } }; // Nes_Dmc struct Nes_Dmc : Nes_Osc { int address; // address of next byte to read int period; //int length_counter; // bytes remaining to play (already defined in Nes_Osc) int buf; int bits_remain; int bits; bool buf_full; bool silence; enum { loop_flag = 0x40 }; int dac; nes_time_t next_irq; bool irq_enabled; bool irq_flag; bool pal_mode; bool nonlinear; int (*prg_reader)( void*, nes_addr_t ); // needs to be initialized to prg read function void* prg_reader_data; Nes_Apu* apu; Blip_Synth<blip_med_quality,1> synth; void start(); void write_register( int, int ); void run( nes_time_t, nes_time_t ); void recalc_irq(); void fill_buffer(); void reload_sample(); void reset(); int count_reads( nes_time_t, nes_time_t* ) const; nes_time_t next_read_time() const; }; #endif