Method GetRate

src/framerate_gui.cpp:153–185

Get current rate of a performance element, based on approximately the past one second of data */

		/** Get current rate of a performance element, based on approximately the past one second of data */
		double GetRate()
		{
			/* Start at last recorded point, end at latest when reaching the earliest recorded point */
			int point = this->prev_index;
			int last_point = this->next_index - this->num_valid;
			if (last_point < 0) last_point += NUM_FRAMERATE_POINTS;

			/* Number of data points collected */
			int count = 0;
			/* Time of previous data point */
			TimingMeasurement last = this->timestamps[point];
			/* Total duration covered by collected points */
			TimingMeasurement total = 0;

			/* We have nothing to compare the first point against */
			point--;
			if (point < 0) point = NUM_FRAMERATE_POINTS - 1;

			while (point != last_point) {
				/* Only record valid data points, but pretend the gaps in measurements aren't there */
				if (this->durations[point] != INVALID_DURATION) {
					total += last - this->timestamps[point];
					count++;
				}
				last = this->timestamps[point];
				if (total >= TIMESTAMP_PRECISION) break; // end after 1 second has been collected
				point--;
				if (point < 0) point = NUM_FRAMERATE_POINTS - 1;
			}

			if (total == 0 || count == 0) return 0;
			return (double)count * TIMESTAMP_PRECISION / total;
		}
	};

	/** %Game loop rate, cycles per second */