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chip8.h
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chip8.h
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#include <SDL2/SDL.h>
#include <string>
class chip8 {
public:
unsigned short opcode;
// RAM memory
unsigned char memory[4096];
// 16 registers (V0 to VF)
unsigned char V[16];
// index register "I"
unsigned short I;
// program counter
unsigned short PC;
// graphics matrix (64x32 pixels / bits)
bool gfx[64][32];
bool draw_flag;
// preloaded fontset
unsigned char fontset[80] = {
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
};
// delay timer
unsigned short delay_timer;
// sound timer
unsigned short sound_timer;
// stack and stack_pointer (used to return from subroutines)
unsigned short stack[16];
unsigned short stack_pointer;
bool keypad[16];
// SDL
SDL_Window *window;
SDL_Renderer *renderer;
SDL_Surface *screenSurface;
SDL_Rect sdl_rect;
SDL_Event sdl_event;
void initialize(std::string rom_path);
void debug_print();
void emulate_cycle();
private:
void initialize_SDL();
void render_SDL_from_gfx();
void clear_gfx();
void clear_keypad();
void load_fontset();
void clear_memory();
void reset_timers();
void clear_registers();
void clear_stack();
void load_game(std::string);
};