chip8.h

#include <stdint.h>
#include <pthread.h>
#include <stdbool.h>

#define CHIP8_SCREEN_WIDTH 64
#define CHIP8_SCREEN_HEIGHT 32

typedef enum {
	CHIP8_CYCLE = 0,
	CHIP8_REDRAW = 1
} chip8_callback_type_t;

struct chip8_t;
typedef struct chip8_t chip8_t;

typedef struct {
	chip8_callback_type_t type;
	union {
		struct {
			uint8_t x;
			uint8_t y;
			uint8_t width;
			uint8_t height;
		} redraw_event;
	};
} chip8_event_t;

typedef void(*chip8_callback_t)(chip8_t *, chip8_event_t);

struct chip8_t {
	// 1 represents a white pixel and 0 represents a black pixel. Use this for drawing.
	bool framebuffer[CHIP8_SCREEN_WIDTH][CHIP8_SCREEN_HEIGHT];

	// Increase this value to increase the speed. Set to 0 for default speed.
	uint8_t speed;

	// Access these directly if you want to have more control over the input.
	uint16_t keyboard_mask; // Example (check key F): self->keyboard_mask & (1 << 0xF)
	bool dont_auto_update_keyboard_mask;

	// Do not access these directly unless you know what you are doing.
	uint8_t memory[0x1000];
	chip8_callback_t callbacks[2];
	uint8_t registers[0x10];
	uint16_t program_counter; // PC
	struct {
		uint8_t delay;
		uint8_t sound;
	} timers;
	uint16_t stack[0x10];
	uint8_t stack_pt; // SP
	uint16_t mem_pt; // I
	pthread_t emulation_thread;
};

chip8_t *chip8_init(void);
void chip8_set_callback(chip8_t *self, chip8_callback_type_t type, chip8_callback_t callback);
size_t chip8_load_rom(chip8_t *self, const char *path);
void chip8_cycle(chip8_t *self);
void chip8_free(chip8_t *self);