realtime engine

struct RealTimeEngine
{
  i32 m_lastTicks;
  i32 m_coreSpeed;
  bool m_running = true;

  RealTimeEngine(const i32 &coreSpeed = 120) : m_coreSpeed(coreSpeed), m_lastTicks(0){}
  void Start() { m_lastTicks = clock(); m_running = true; }
  void Stop() { m_running = false; }
  i32 Steps()
  {
    if (m_running)
    {
      i32 tickDiff = clock() - m_lastTicks;
      i32 stepDiff = tickDiff * m_coreSpeed / 1000;
      m_lastTicks += stepDiff * 1000 / m_coreSpeed;
      return stepDiff;
    }
    return 0;
  }
};