chip8.h

//
// Created by Jessica on 5/26/2020.
//

#ifndef CHIP8_CHIP8_H
#define CHIP8_CHIP8_H

#include <cstdio>
#include <ctime>
#include <cstdlib>

struct emu_state {
    unsigned short opcode;
    unsigned char memory[4096];
    unsigned char V[16];
    unsigned short I;
    unsigned short pc;
    unsigned char gfx[64 * 32];
    unsigned char delay_timer;
    unsigned char sound_timer;
    unsigned short stack[16];
    unsigned short sp;
    unsigned char key[16];
};

class chip8 {
public:
    struct emu_state s;
    bool drawFlag;
    bool isRunning;

    void initialize();

    void loadGame(const unsigned char *data, int size);

    void emulateCycle();

private:
    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
            };

    void clearScreen();

    void drawSprite(unsigned short x, unsigned short y, unsigned short h);

    int getBlockingKey();
};
#endif //CHIP8_CHIP8_H