gltf-pipeline/lib/removePipelineExtras.js

Content pipeline tools for optimizing glTF assets.

'use strict';
const Cesium = require('cesium');
const ForEach = require('./ForEach');

const defined = Cesium.defined;

module.exports = removePipelineExtras;

/**
 * Iterate through the objects within the glTF and delete their pipeline extras object.
 *
 * @param {Object} gltf A javascript object containing a glTF asset.
 * @returns {Object} glTF with no pipeline extras.
 *
 * @private
 */
function removePipelineExtras(gltf) {
    ForEach.shader(gltf, function(shader) {
        removeExtras(shader);
    });
    ForEach.buffer(gltf, function(buffer) {
        removeExtras(buffer);
    });
    ForEach.image(gltf, function (image) {
        removeExtras(image);
        ForEach.compressedImage(image, function(compressedImage) {
            removeExtras(compressedImage);
        });
    });

    removeExtras(gltf);

    return gltf;
}

function removeExtras(object) {
    if (!defined(object.extras)) {
        return;
    }

    if (defined(object.extras._pipeline)) {
        delete object.extras._pipeline;
    }

    if (Object.keys(object.extras).length === 0) {
        delete object.extras;
    }
}