/**

 * Count how many times the interval has elapsed, and update the timer.

 * Use to ensure a specific amount of events happen within a timeframe, e.g. for animation.

 * The timer value does not need to be initialised.

 * @param timer Timer to test. Value will be increased.

 * @param delta Time since last test.

 * @param interval Timing interval.

 * @return Number of times the interval has elapsed.

 */

static inline uint CountIntervalElapsed(uint &timer, uint delta, uint interval)

{

	uint count = delta / interval;

	if (timer + (delta % interval) >= interval) count++;

	timer = (timer + delta) % interval;

	return count;

}

/**

 * Test if a timer has elapsed, and update the timer.

 * Use to ensure an event happens only once within a timeframe, e.g. for window updates.

 * The timer value must be initialised in order for the timer to elapsed.

 * @param timer Timer to test. Value will be decreased.

 * @param delta Time since last test.

 * @return True iff the timer has elapsed.

 */

static inline bool TimerElapsed(int &timer, uint delta)

{

	if (timer <= 0) return false;

	timer -= delta;

	return timer <= 0;

}