From 9076b172da1e272dc475ad0a0c0027fa48254a29 Mon Sep 17 00:00:00 2001
From: Alan Millman <alan.millman@here.com>
Date: Wed, 14 Feb 2018 17:09:40 -0600
Subject: [PATCH] Editor determines GLTF version and uses appropriate loader

---
 editor/index.html   |  1 +
 editor/js/Loader.js | 54 ++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 54 insertions(+), 1 deletion(-)

diff --git a/editor/index.html b/editor/index.html
index a00a76e9e24f8b..7330a2b012fec6 100644
--- a/editor/index.html
+++ b/editor/index.html
@@ -24,6 +24,7 @@
 		<script src="../examples/js/loaders/ColladaLoader.js"></script>
 		<script src="../examples/js/loaders/FBXLoader.js"></script>
 		<script src="../examples/js/loaders/GLTFLoader.js"></script>
+		<script src="../examples/js/loaders/deprecated/LegacyGLTFLoader.js"></script>
 		<script src="../examples/js/loaders/KMZLoader.js"></script>
 		<script src="../examples/js/loaders/MD2Loader.js"></script>
 		<script src="../examples/js/loaders/OBJLoader.js"></script>
diff --git a/editor/js/Loader.js b/editor/js/Loader.js
index 3be687970b023d..cb4e81cfaf89e3 100644
--- a/editor/js/Loader.js
+++ b/editor/js/Loader.js
@@ -176,7 +176,18 @@ var Loader = function ( editor ) {
 
 					var contents = event.target.result;
 
-					var loader = new THREE.GLTFLoader();
+					var loader;
+
+					if ( isGltf1( contents ) ) {
+
+						loader = new THREE.LegacyGLTFLoader();
+
+					} else {
+
+						loader = new THREE.GLTFLoader();
+
+					}
+
 					loader.parse( contents, '', function ( result ) {
 
 						result.scene.name = filename;
@@ -572,4 +583,45 @@ var Loader = function ( editor ) {
 
 	}
 
+	function isGltf1( contents ) {
+
+		var resultContent;
+
+		if ( typeof contents === 'string' ) {
+
+			resultContent = contents;
+
+		} else {
+
+			var magic = THREE.LoaderUtils.decodeText( new Uint8Array( contents, 0, 4 ) );
+
+			if ( magic === 'glTF' ) {
+
+				try {
+
+					extensions[ EXTENSIONS.KHR_BINARY_GLTF ] = new GLTFBinaryExtension( contents );
+
+				} catch ( error ) {
+
+					// dunno what it is, but it's definitely not OK
+					return false;
+
+				}
+
+				resultContent = extensions[ EXTENSIONS.KHR_BINARY_GLTF ].content;
+
+			} else {
+
+				resultContent = THREE.LoaderUtils.decodeText( new Uint8Array( contents ) );
+
+			}
+
+		}
+
+		var json = JSON.parse( resultContent );
+
+		return ( json.asset != undefined && json.asset.version[ 0 ] < 2 );
+
+	}
+
 };