private static float getTime()
    {
        return (Sys.getTime() * 1000) / Sys.getTimerResolution();
    }

    public static float getDeltaTime()
    {
        return delta;
    }

    private void displayDelta()
    {
        if (getTime() - lastFps > 1000)
        {
            Display.setTitle("Dino Pizza Attack! FPS: " + fps);
            fps = 0;
            lastFps += 1000;
        }
        fps++;
    }

// Straight code which calculates delta
// This code goes inside of my main update() loop

time = getTime();
delta = time - lastFrame;
lastFrame = time;