Update js/GLTFLoader.js to keep changes after modularize

examples/js/loaders/GLTFLoader.js

@@ -5,6 +5,7 @@ console.warn( "THREE.GLTFLoader: As part of the transition to ES6 Modules, the f
  * @author Tony Parisi / http://www.tonyparisi.com/
  * @author Takahiro / https://github.com/takahirox
  * @author Don McCurdy / https://www.donmccurdy.com
+ * @author Arseny Kapoulkine / https://github.com/zeux
  */
 
 THREE.GLTFLoader = ( function () {
@@ -15,6 +16,7 @@ THREE.GLTFLoader = ( function () {
 
 		this.dracoLoader = null;
 		this.ddsLoader = null;
+		this.ktx2Loader = null;
 
 		this.pluginCallbacks = [];
 		this.register( function ( parser ) {
@@ -22,6 +24,11 @@ THREE.GLTFLoader = ( function () {
 			return new GLTFMaterialsClearcoatExtension( parser );
 
 		} );
+		this.register( function ( parser ) {
+
+			return new GLTFTextureBasisU( parser );
+
+		} );
 
 	}
 
@@ -119,6 +126,13 @@ THREE.GLTFLoader = ( function () {
 
 		},
 
+		setKTX2Loader: function ( ktx2Loader ) {
+
+			this.ktx2Loader = ktx2Loader;
+			return this;
+
+		},
+
 		register: function ( callback ) {
 
 			if ( this.pluginCallbacks.indexOf( callback ) === - 1 ) {
@@ -193,7 +207,8 @@ THREE.GLTFLoader = ( function () {
 
 				path: path || this.resourcePath || '',
 				crossOrigin: this.crossOrigin,
-				manager: this.manager
+				manager: this.manager,
+				ktx2Loader: this.ktx2Loader
 
 			} );
 
@@ -535,6 +550,46 @@ THREE.GLTFLoader = ( function () {
 
 	};
 
+	/**
+	 * BasisU Texture Extension
+	 *
+	 * Specification: https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_texture_basisu
+	 * (Link above TBD, currently in PR https://github.com/KhronosGroup/glTF/pull/1751)
+	 */
+	function GLTFTextureBasisU( parser ) {
+
+		this.parser = parser;
+		this.name = "KHR_texture_basisu";
+
+	}
+
+	GLTFTextureBasisU.prototype.loadTexture = function ( textureIndex ) {
+
+		var parser = this.parser;
+		var json = parser.json;
+
+		var textureDef = json.textures[ textureIndex ];
+
+		if ( ! textureDef.extensions || ! textureDef.extensions[ this.name ] ) {
+
+			return null;
+
+		}
+
+		var extension = textureDef.extensions[ this.name ];
+		var source = json.images[ extension.source ];
+		var loader = parser.options.ktx2Loader;
+
+		if ( !loader ) {
+
+			throw new Error( 'THREE.GLTFLoader: setKTX2Loader must be called before loading KTX2 textures' );
+
+		}
+
+		return parser.loadTextureImage( textureIndex, source, loader );
+
+	};
+
 	/* BINARY EXTENSION */
 	var BINARY_EXTENSION_HEADER_MAGIC = 'glTF';
 	var BINARY_EXTENSION_HEADER_LENGTH = 12;
@@ -1696,7 +1751,11 @@ THREE.GLTFLoader = ( function () {
 					break;
 
 				case 'texture':
-					dependency = this.loadTexture( index );
+					dependency = this._invokeOne( function ( ext ) {
+
+						return ext.loadTexture && ext.loadTexture( index );
+
+					} );
 					break;
 
 				case 'skin':
@@ -1954,9 +2013,6 @@ THREE.GLTFLoader = ( function () {
 		var parser = this;
 		var json = this.json;
 		var options = this.options;
-		var textureLoader = this.textureLoader;
-
-		var URL = self.URL || self.webkitURL;
 
 		var textureDef = json.textures[ textureIndex ];
 
@@ -1974,6 +2030,36 @@ THREE.GLTFLoader = ( function () {
 
 		}
 
+		var loader;
+
+		if ( source.uri ) {
+
+			loader = options.manager.getHandler( source.uri );
+
+		}
+
+		if ( ! loader ) {
+
+			loader = textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ]
+			? parser.extensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].ddsLoader
+			: this.textureLoader;
+
+		}
+
+		return this.loadTextureImage( textureIndex, source, loader );
+	};
+
+	GLTFParser.prototype.loadTextureImage = function ( textureIndex, source, loader ) {
+
+		var parser = this;
+		var json = this.json;
+		var options = this.options;
+
+		var textureDef = json.textures[ textureIndex ];
+		var textureExtensions = textureDef.extensions || {};
+
+		var URL = self.URL || self.webkitURL;
+
 		var sourceURI = source.uri;
 		var isObjectURL = false;
 
@@ -1994,18 +2080,6 @@ THREE.GLTFLoader = ( function () {
 
 		return Promise.resolve( sourceURI ).then( function ( sourceURI ) {
 
-			// Load Texture resource.
-
-			var loader = options.manager.getHandler( sourceURI );
-
-			if ( ! loader ) {
-
-				loader = textureExtensions[ EXTENSIONS.MSFT_TEXTURE_DDS ]
-					? parser.extensions[ EXTENSIONS.MSFT_TEXTURE_DDS ].ddsLoader
-					: textureLoader;
-
-			}
-
 			return new Promise( function ( resolve, reject ) {
 
 				var onLoad = resolve;