@pixi/utils/lib/data/pow2.js

Collection of utilities used by PixiJS

'use strict';

Object.defineProperty(exports, '__esModule', { value: true });

function nextPow2(v) {
  v += v === 0 ? 1 : 0;
  --v;
  v |= v >>> 1;
  v |= v >>> 2;
  v |= v >>> 4;
  v |= v >>> 8;
  v |= v >>> 16;
  return v + 1;
}
function isPow2(v) {
  return !(v & v - 1) && !!v;
}
function log2(v) {
  let r = (v > 65535 ? 1 : 0) << 4;
  v >>>= r;
  let shift = (v > 255 ? 1 : 0) << 3;
  v >>>= shift;
  r |= shift;
  shift = (v > 15 ? 1 : 0) << 2;
  v >>>= shift;
  r |= shift;
  shift = (v > 3 ? 1 : 0) << 1;
  v >>>= shift;
  r |= shift;
  return r | v >> 1;
}

exports.isPow2 = isPow2;
exports.log2 = log2;
exports.nextPow2 = nextPow2;
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