41 lines
708 B
JavaScript
41 lines
708 B
JavaScript
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/* global VT */
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window.VT = window.VT || {};
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VT.AppFps = function (el) {
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var sampleSize = 20;
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var times = [];
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tick();
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function tick() {
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requestAnimationFrame(tick);
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times.push(performance.now());
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if (times.length <= sampleSize) return;
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var min = Infinity;
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var max = 0;
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var sum = 0;
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for (var i = 1; i < sampleSize + 1; ++i) {
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var delta = times[i] - times[i - 1];
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min = Math.min(min, delta);
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max = Math.max(max, delta);
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sum += delta;
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}
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var fps = (sampleSize / sum) * 1000;
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el.innerText =
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fps.toFixed(0) +
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' fps (' +
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min.toFixed(0) +
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' ms - ' +
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max.toFixed(0) +
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' ms)';
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times = [];
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}
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};
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