main.c

#include <stdint.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>

#include <SDL2/SDL.h>

#include "chip8.h"

#define SCREEN_WIDTH 64 * 8
#define SCREEN_HEIGHT 32 * 8
#define REFRESH_RATE 700

int main(int argc, char *argv[])
{
    if (argc == 1)
    {
        printf("Usage: %s <rom-path>\n", argv[0]);
        return -1;
    }

    initialise_chip8(&chip8);
    load_rom(argv[1], &chip8);

    // Seed random values
    srand(time(NULL));

    if (SDL_Init(SDL_INIT_EVERYTHING) != 0)
    {
        printf("There has been an error initialising SDL.\n%s\n", SDL_GetError());
        return -1;
    }
	
    app.window = SDL_CreateWindow(
            "CHIP-8",
            SDL_WINDOWPOS_UNDEFINED,
            SDL_WINDOWPOS_UNDEFINED,
            SCREEN_WIDTH,
            SCREEN_HEIGHT,
            0
    );

    if (!app.window)
    {
        printf("There has been an error creating the window.\n%s\n", SDL_GetError());
        return -1;
    }

    app.renderer = SDL_CreateRenderer(app.window, -1, SDL_RENDERER_SOFTWARE);

    if (!app.renderer)
    {
        printf("There has been an error creating the renderer.\n%s\n", SDL_GetError());
        return -1;
    }

    // Set initial render draw color
    SDL_SetRenderDrawColor(app.renderer, 0, 0, 0, 255);

    SDL_Event e;

    int quit = 0;
    while (!quit)
    {
        while (SDL_PollEvent(&e) != 0)
        {
            if (e.type == SDL_QUIT)
            {
                quit = 1;
            }
        }
            
        update(&chip8);

        SDL_RenderPresent(app.renderer);

        // Enforce FPS
        SDL_Delay(1000/REFRESH_RATE);
    }

    SDL_DestroyWindow(app.window);
    SDL_Quit();

    return 0;
}