feat: initial version

hdrs/chip8.h

@@ -0,0 +1,34 @@
+#ifndef CHIP8_H
+# define CHIP8_H
+
+#include <stdint.h>
+#include "./memory.h"
+#include "./graphics.h"
+#include "./input.h"
+
+#define FRAME_TIME_MS 1000 / 60
+
+typedef struct s_chip8
+{
+    t_memory memory;
+    t_display display;
+    t_keyboard keyboard;
+
+    uint8_t v[16];
+    uint16_t i;
+    uint16_t pc;
+
+    uint8_t delay_timer;
+    uint8_t sound_timer;
+
+    uint16_t stack[16];
+    uint8_t sp;
+
+    int running;
+} t_chip8;
+
+int chip8_load_rom(t_chip8 *emu, const char *path);
+void chip8_init(t_chip8 *emu);
+void chip8_run(t_chip8 *emu);
+
+#endif

hdrs/cpu.h

@@ -0,0 +1,23 @@
+#ifndef CPU_H
+# define CPU_H
+
+#include "./chip8.h"
+#include <stdint.h>
+
+typedef struct s_instruction
+{
+    uint16_t opcode;
+    uint8_t type;
+    uint8_t x;
+    uint8_t y;
+    uint8_t n;
+    uint8_t nn;
+    uint16_t nnn;
+} t_instruction;
+
+
+uint16_t cpu_fetch(t_chip8 *emu);
+t_instruction cpu_decode(uint16_t opcode);
+void cpu_execute(t_chip8 *emu, t_instruction instruction);
+
+#endif

hdrs/font.h

@@ -0,0 +1,27 @@
+#ifndef FONT_H
+#define FONT_H
+
+#define FONTSET_SIZE 80
+#define FONTSET_START (MEMORY_SIZE - FONTSET_SIZE)
+
+static const unsigned char FONTSET[FONTSET_SIZE] = {
+    0xF0, 0x90, 0x90, 0x90, 0xF0, // 0
+	0x20, 0x60, 0x20, 0x20, 0x70, // 1
+	0xF0, 0x10, 0xF0, 0x80, 0xF0, // 2
+	0xF0, 0x10, 0xF0, 0x10, 0xF0, // 3
+	0x90, 0x90, 0xF0, 0x10, 0x10, // 4
+	0xF0, 0x80, 0xF0, 0x10, 0xF0, // 5
+	0xF0, 0x80, 0xF0, 0x90, 0xF0, // 6
+	0xF0, 0x10, 0x20, 0x40, 0x40, // 7
+	0xF0, 0x90, 0xF0, 0x90, 0xF0, // 8
+	0xF0, 0x90, 0xF0, 0x10, 0xF0, // 9
+	0xF0, 0x90, 0xF0, 0x90, 0x90, // A
+	0xE0, 0x90, 0xE0, 0x90, 0xE0, // B
+	0xF0, 0x80, 0x80, 0x80, 0xF0, // C
+	0xE0, 0x90, 0x90, 0x90, 0xE0, // D
+	0xF0, 0x80, 0xF0, 0x80, 0xF0, // E
+	0xF0, 0x80, 0xF0, 0x80, 0x80  // F
+};
+
+
+#endif

hdrs/graphics.h

@@ -0,0 +1,29 @@
+#ifndef GRAPHICS_H
+#define GRAPHICS_H
+
+#include <SDL2/SDL.h>
+#include <stdint.h>
+
+struct s_chip8;
+typedef struct s_chip8 t_chip8;
+
+#define SCREEN_WIDTH 64
+#define SCREEN_HEIGHT 32
+#define SCALE 12
+
+typedef struct s_display
+{
+    SDL_Window *window;
+    SDL_Renderer *renderer;
+    SDL_Texture *texture;
+    uint32_t pixels[SCREEN_WIDTH * SCREEN_HEIGHT];
+} t_display;
+
+int graphics_init(t_display *display);
+void graphics_render(t_chip8 *emu);
+void graphics_cleanup(t_display *display);
+void graphics_draw_sprite(t_chip8 *emu, uint8_t x, uint8_t y, uint8_t n);
+int graphics_display_ready();
+
+
+#endif

hdrs/input.h

@@ -0,0 +1,26 @@
+#ifndef INPUT_H
+#define INPUT_H
+
+#include <stdint.h>
+#include <SDL2/SDL.h>
+
+#define KEY_COUNT 16
+
+struct s_chip8;
+typedef struct s_chip8 t_chip8;
+
+typedef struct s_keyboard
+{
+    uint8_t keyboard[KEY_COUNT];
+    uint8_t waiting_for_key;
+    uint8_t key_pressed;
+    uint8_t key_register;
+} t_keyboard;
+
+
+void input_update(SDL_Event *event, uint8_t *keyboard);
+uint8_t map_sdl_to_chip8(SDL_Keycode key);
+uint8_t get_pressed_key(t_chip8 *emu);
+
+
+#endif // INPUT_H

hdrs/memory.h

@@ -0,0 +1,22 @@
+#ifndef MEMORY_H
+# define MEMORY_H
+
+#include <stdint.h>
+#include <stdio.h>
+#include "graphics.h"
+
+#define MEMORY_SIZE 4096
+
+typedef struct s_memory
+{
+    uint8_t memory[MEMORY_SIZE];
+    uint8_t screen[SCREEN_WIDTH * SCREEN_HEIGHT];
+} t_memory;
+
+void memory_init(t_memory *mem);
+int memory_load_rom(t_memory *mem, FILE *fp);
+void memory_load_fontset(t_memory *mem);
+void memory_clear_screen(t_memory *mem);
+void memory_dump(t_memory *mem, const char *path);
+
+#endif