67 lines
1.6 KiB
C
67 lines
1.6 KiB
C
#ifndef apu_h
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#define apu_h
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#include <stdbool.h>
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#include <stdint.h>
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/* Divides nicely and never overflows with 4 channels */
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#define MAX_CH_AMP 0x1E00
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#define CH_STEP (0x1E00/0xF)
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#include "save_struct.h"
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struct GB_gameboy_s;
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typedef struct GB_gameboy_s GB_gameboy_t;
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typedef struct
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{
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int16_t left;
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int16_t right;
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} GB_sample_t;
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/* Not all used on all channels */
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typedef struct
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{
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uint64_t phase;
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uint32_t wave_length;
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GB_aligned_double duty;
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GB_aligned_double sound_length; /* In seconds */
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int16_t amplitude;
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int16_t start_amplitude;
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bool stop_on_length;
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uint8_t envelope_steps;
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uint8_t cur_envelope_steps;
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signed int envelope_direction;
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uint8_t sweep_steps;
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uint8_t cur_sweep_steps;
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signed int sweep_direction;
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uint8_t sweep_shift;
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bool is_playing;
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uint16_t NRX3_X4_temp;
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bool left_on;
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bool right_on;
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} GB_apu_channel_t;
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typedef struct
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{
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uint8_t apu_cycles;
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bool global_enable;
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GB_aligned_double envelope_step_timer; /* In seconds */
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GB_aligned_double sweep_step_timer; /* In seconds */
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int8_t wave_form[32];
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uint8_t wave_shift;
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bool wave_enable;
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uint16_t lfsr;
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bool lfsr_7_bit;
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double left_volume;
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double right_volume;
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GB_apu_channel_t wave_channels[4];
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} GB_apu_t;
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void GB_apu_copy_buffer(GB_gameboy_t *gb, GB_sample_t *dest, unsigned int count);
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void GB_apu_write(GB_gameboy_t *gb, uint8_t reg, uint8_t value);
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uint8_t GB_apu_read(GB_gameboy_t *gb, uint8_t reg);
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void GB_apu_init(GB_gameboy_t *gb);
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void GB_apu_run(GB_gameboy_t *gb);
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#endif /* apu_h */
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