60 lines
1.6 KiB
C
60 lines
1.6 KiB
C
#ifndef apu_h
|
|
#define apu_h
|
|
#include <stdbool.h>
|
|
#include <stdint.h>
|
|
|
|
/* Divides nicely and never overflows with 4 channels */
|
|
#define MAX_CH_AMP 0x1E00
|
|
#define CH_STEP (0x1E00/0xF)
|
|
|
|
|
|
struct GB_gameboy_s;
|
|
typedef struct GB_gameboy_s GB_gameboy_t;
|
|
|
|
/* Not all used on all channels */
|
|
typedef struct
|
|
{
|
|
double phase;
|
|
double frequency;
|
|
int16_t amplitude;
|
|
int16_t start_amplitude;
|
|
double duty;
|
|
double sound_length; /* In seconds */
|
|
bool stop_on_length;
|
|
unsigned char envelope_steps;
|
|
unsigned char cur_envelope_steps;
|
|
signed int envelope_direction;
|
|
unsigned char sweep_steps;
|
|
unsigned char cur_sweep_steps;
|
|
signed int sweep_direction;
|
|
unsigned char sweep_shift;
|
|
bool is_playing;
|
|
} GB_apu_channel_t;
|
|
|
|
typedef struct
|
|
{
|
|
GB_apu_channel_t wave_channels[4];
|
|
double envelope_step_timer; /* In seconds */
|
|
double sweep_step_timer; /* In seconds */
|
|
signed char wave_form[32];
|
|
unsigned char wave_shift;
|
|
bool wave_enable;
|
|
uint16_t lfsr;
|
|
bool lfsr_7_bit;
|
|
double left_volume;
|
|
double right_volume;
|
|
bool left_on[4];
|
|
bool right_on[4];
|
|
bool global_enable;
|
|
} GB_apu_t;
|
|
|
|
void apu_render(GB_gameboy_t *gb, unsigned long sample_rate, unsigned long n_samples, int16_t *samples);
|
|
void apu_copy_buffer(GB_gameboy_t *gb, int16_t *dest, unsigned int count);
|
|
void apu_write(GB_gameboy_t *gb, unsigned char reg, unsigned char value);
|
|
unsigned char apu_read(GB_gameboy_t *gb, unsigned char reg);
|
|
void apu_init(GB_gameboy_t *gb);
|
|
void apu_copy_buffer(GB_gameboy_t *gb, int16_t *dest, unsigned int count);
|
|
void apu_run(GB_gameboy_t *gb);
|
|
|
|
#endif /* apu_h */
|