shaka-player
Version:
DASH/EME video player library
46 lines (41 loc) • 936 B
JavaScript
/*! @license
* glMatrix: https://github.com/toji/gl-matrix/
* Copyright 2015-2021, Brandon Jones, Colin MacKenzie IV
* SPDX-License-Identifier: MIT
*/
goog.provide('shaka.ui.MatrixQuaternion');
/**
* Quaternion in the format XYZW
*/
shaka.ui.MatrixQuaternion = class {
/**
* Creates a new identity quaternion
*
* @return {!Float32Array} a new quaternion
*/
static create() {
const out = new Float32Array(4);
out[3] = 1;
return out;
}
/**
* Normalize a quaternion
*
* @param {!Float32Array} out the receiving quaternion
* @param {!Float32Array} a quaternion to normalize
*/
static normalize(out, a) {
const x = a[0];
const y = a[1];
const z = a[2];
const w = a[3];
let len = x * x + y * y + z * z + w * w;
if (len > 0) {
len = 1 / Math.sqrt(len);
}
out[0] = x * len;
out[1] = y * len;
out[2] = z * len;
out[3] = w * len;
}
};