gltf-pipeline/lib/addExtensionsUsed.js

Content pipeline tools for optimizing glTF assets.

"use strict";
const Cesium = require("cesium");
const addToArray = require("./addToArray");

const defined = Cesium.defined;

module.exports = addExtensionsUsed;

/**
 * Adds an extension to gltf.extensionsUsed if it does not already exist.
 * Initializes extensionsUsed if it is not defined.
 *
 * @param {object} gltf A javascript object containing a glTF asset.
 * @param {string} extension The extension to add.
 *
 * @private
 */
function addExtensionsUsed(gltf, extension) {
  let extensionsUsed = gltf.extensionsUsed;
  if (!defined(extensionsUsed)) {
    extensionsUsed = [];
    gltf.extensionsUsed = extensionsUsed;
  }
  addToArray(extensionsUsed, extension, true);
}