framelock.rs

loop {
    let init_time = PreciseTime::now();

    /* Draw and Event Loop */
    
    let term_time = PreciseTime::now();
    let duration = init_time.to(term_time);
    let desired_duration = Duration::milliseconds((1000.0/60.0) as i64);
    let offset = desired_duration.num_milliseconds() - duration.num_milliseconds();
    if duration < desired_duration {
        thread::sleep_ms(offset as u32);
    }
}