diff options
Diffstat (limited to 'plugins/gme/Game_Music_Emu-0.5.2/gme/Nes_Apu.h')
| -rw-r--r-- | plugins/gme/Game_Music_Emu-0.5.2/gme/Nes_Apu.h | 179 |
1 files changed, 0 insertions, 179 deletions
diff --git a/plugins/gme/Game_Music_Emu-0.5.2/gme/Nes_Apu.h b/plugins/gme/Game_Music_Emu-0.5.2/gme/Nes_Apu.h deleted file mode 100644 index dbd8484c..00000000 --- a/plugins/gme/Game_Music_Emu-0.5.2/gme/Nes_Apu.h +++ /dev/null @@ -1,179 +0,0 @@ -// NES 2A03 APU sound chip emulator - -// Nes_Snd_Emu 0.1.8 -#ifndef NES_APU_H -#define NES_APU_H - -#include "blargg_common.h" - -typedef blargg_long nes_time_t; // CPU clock cycle count -typedef unsigned nes_addr_t; // 16-bit memory address - -#include "Nes_Oscs.h" - -struct apu_state_t; -class Nes_Buffer; - -class Nes_Apu { -public: - // Set buffer to generate all sound into, or disable sound if NULL - void output( Blip_Buffer* ); - - // Set memory reader callback used by DMC oscillator to fetch samples. - // When callback is invoked, 'user_data' is passed unchanged as the - // first parameter. - void dmc_reader( int (*callback)( void* user_data, nes_addr_t ), void* user_data = NULL ); - - // All time values are the number of CPU clock cycles relative to the - // beginning of the current time frame. Before resetting the CPU clock - // count, call end_frame( last_cpu_time ). - - // Write to register (0x4000-0x4017, except 0x4014 and 0x4016) - enum { start_addr = 0x4000 }; - enum { end_addr = 0x4017 }; - void write_register( nes_time_t, nes_addr_t, int data ); - - // Read from status register at 0x4015 - enum { status_addr = 0x4015 }; - int read_status( nes_time_t ); - - // Run all oscillators up to specified time, end current time frame, then - // start a new time frame at time 0. Time frames have no effect on emulation - // and each can be whatever length is convenient. - void end_frame( nes_time_t ); - -// Additional optional features (can be ignored without any problem) - - // Reset internal frame counter, registers, and all oscillators. - // Use PAL timing if pal_timing is true, otherwise use NTSC timing. - // Set the DMC oscillator's initial DAC value to initial_dmc_dac without - // any audible click. - void reset( bool pal_mode = false, int initial_dmc_dac = 0 ); - - // Adjust frame period - void set_tempo( double ); - - // Save/load exact emulation state - void save_state( apu_state_t* out ) const; - void load_state( apu_state_t const& ); - - // Set overall volume (default is 1.0) - void volume( double ); - - // Set treble equalization (see notes.txt) - void treble_eq( const blip_eq_t& ); - - // Set sound output of specific oscillator to buffer. If buffer is NULL, - // the specified oscillator is muted and emulation accuracy is reduced. - // The oscillators are indexed as follows: 0) Square 1, 1) Square 2, - // 2) Triangle, 3) Noise, 4) DMC. - enum { osc_count = 5 }; - void osc_output( int index, Blip_Buffer* buffer ); - - // Set IRQ time callback that is invoked when the time of earliest IRQ - // may have changed, or NULL to disable. When callback is invoked, - // 'user_data' is passed unchanged as the first parameter. - void irq_notifier( void (*callback)( void* user_data ), void* user_data = NULL ); - - // Get time that APU-generated IRQ will occur if no further register reads - // or writes occur. If IRQ is already pending, returns irq_waiting. If no - // IRQ will occur, returns no_irq. - enum { no_irq = LONG_MAX / 2 + 1 }; - enum { irq_waiting = 0 }; - nes_time_t earliest_irq( nes_time_t ) const; - - // Count number of DMC reads that would occur if 'run_until( t )' were executed. - // If last_read is not NULL, set *last_read to the earliest time that - // 'count_dmc_reads( time )' would result in the same result. - int count_dmc_reads( nes_time_t t, nes_time_t* last_read = NULL ) const; - - // Time when next DMC memory read will occur - nes_time_t next_dmc_read_time() const; - - // Run DMC until specified time, so that any DMC memory reads can be - // accounted for (i.e. inserting CPU wait states). - void run_until( nes_time_t ); - -public: - Nes_Apu(); - BLARGG_DISABLE_NOTHROW -private: - friend class Nes_Nonlinearizer; - void enable_nonlinear( double volume ); - static double nonlinear_tnd_gain() { return 0.75; } -private: - friend struct Nes_Dmc; - - // noncopyable - Nes_Apu( const Nes_Apu& ); - Nes_Apu& operator = ( const Nes_Apu& ); - - Nes_Osc* oscs [osc_count]; - Nes_Square square1; - Nes_Square square2; - Nes_Noise noise; - Nes_Triangle triangle; - Nes_Dmc dmc; - - double tempo_; - nes_time_t last_time; // has been run until this time in current frame - nes_time_t last_dmc_time; - nes_time_t earliest_irq_; - nes_time_t next_irq; - int frame_period; - int frame_delay; // cycles until frame counter runs next - int frame; // current frame (0-3) - int osc_enables; - int frame_mode; - bool irq_flag; - void (*irq_notifier_)( void* user_data ); - void* irq_data; - Nes_Square::Synth square_synth; // shared by squares - - void irq_changed(); - void state_restored(); - void run_until_( nes_time_t ); - - // TODO: remove - friend class Nes_Core; -}; - -inline void Nes_Apu::osc_output( int osc, Blip_Buffer* buf ) -{ - assert( (unsigned) osc < osc_count ); - oscs [osc]->output = buf; -} - -inline nes_time_t Nes_Apu::earliest_irq( nes_time_t ) const -{ - return earliest_irq_; -} - -inline void Nes_Apu::dmc_reader( int (*func)( void*, nes_addr_t ), void* user_data ) -{ - dmc.prg_reader_data = user_data; - dmc.prg_reader = func; -} - -inline void Nes_Apu::irq_notifier( void (*func)( void* user_data ), void* user_data ) -{ - irq_notifier_ = func; - irq_data = user_data; -} - -inline int Nes_Apu::count_dmc_reads( nes_time_t time, nes_time_t* last_read ) const -{ - return dmc.count_reads( time, last_read ); -} - -inline nes_time_t Nes_Dmc::next_read_time() const -{ - if ( length_counter == 0 ) - return Nes_Apu::no_irq; // not reading - - return apu->last_dmc_time + delay + long (bits_remain - 1) * period; -} - -inline nes_time_t Nes_Apu::next_dmc_read_time() const { return dmc.next_read_time(); } - -#endif |