main.c

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

#include "chip8.h"
#include "display.h"

#define OP_HZ 700
#define DISPLAY_HZ 60

int main(int argc, char **argv) {
  if (argc != 2) {
    printf("./chip8 <binary>\n");
    return 1;
  }

  if (init_chip8(argv[1]) != 0) {
    printf("Failed to initialize chip8\n");
    return 1;
  }

  // init display
  if (init_display() != 0) {
    printf("Failed to initialize display\n");
    return 1;
  }

  // Run the main loop
  clock_t now, op_prev, display_prev;
  now = op_prev = display_prev = clock();
  long op_period = CLOCKS_PER_SEC / OP_HZ;
  long display_period = CLOCKS_PER_SEC / DISPLAY_HZ;

  while (running) {
    now = clock();
    if (now - op_prev >= op_period) {
      op_prev = now;
      execute_instruction();
    }
    if (now - display_prev >= display_period) {
      display_prev = now;
      timer_tick();
      process_events();
      refresh_display(chip8.display);
    }
  }

  quit_display();
  return 0;
}