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diff --git a/modules/gltf/gltf_defines.h b/modules/gltf/gltf_defines.h
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+/*************************************************************************/
+/*  gltf_defines.h                                                       */
+/*************************************************************************/
+/*                       This file is part of:                           */
+/*                           GODOT ENGINE                                */
+/*                      https://godotengine.org                          */
+/*************************************************************************/
+/* Copyright (c) 2007-2022 Juan Linietsky, Ariel Manzur.                 */
+/* Copyright (c) 2014-2022 Godot Engine contributors (cf. AUTHORS.md).   */
+/*                                                                       */
+/* Permission is hereby granted, free of charge, to any person obtaining */
+/* a copy of this software and associated documentation files (the       */
+/* "Software"), to deal in the Software without restriction, including   */
+/* without limitation the rights to use, copy, modify, merge, publish,   */
+/* distribute, sublicense, and/or sell copies of the Software, and to    */
+/* permit persons to whom the Software is furnished to do so, subject to */
+/* the following conditions:                                             */
+/*                                                                       */
+/* The above copyright notice and this permission notice shall be        */
+/* included in all copies or substantial portions of the Software.       */
+/*                                                                       */
+/* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
+/* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
+/* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
+/* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
+/* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
+/* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
+/* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
+/*************************************************************************/
+
+#ifndef GLTF_DEFINES_H
+#define GLTF_DEFINES_H
+
+// This file should only be included by other headers.
+
+// Godot classes used by GLTF headers.
+class BoneAttachment3D;
+class CSGShape3D;
+class DirectionalLight3D;
+class GridMap;
+class Light3D;
+class MultiMeshInstance3D;
+class Skeleton3D;
+class Skin;
+
+// GLTF classes.
+struct GLTFAccessor;
+class GLTFAnimation;
+class GLTFBufferView;
+class GLTFCamera;
+class GLTFDocument;
+class GLTFDocumentExtension;
+class GLTFLight;
+class GLTFMesh;
+class GLTFNode;
+class GLTFSkeleton;
+class GLTFSkin;
+class GLTFSpecGloss;
+class GLTFState;
+class GLTFTexture;
+
+// GLTF index aliases.
+using GLTFAccessorIndex = int;
+using GLTFAnimationIndex = int;
+using GLTFBufferIndex = int;
+using GLTFBufferViewIndex = int;
+using GLTFCameraIndex = int;
+using GLTFImageIndex = int;
+using GLTFMaterialIndex = int;
+using GLTFMeshIndex = int;
+using GLTFLightIndex = int;
+using GLTFNodeIndex = int;
+using GLTFSkeletonIndex = int;
+using GLTFSkinIndex = int;
+using GLTFTextureIndex = int;
+
+enum GLTFType {
+	TYPE_SCALAR,
+	TYPE_VEC2,
+	TYPE_VEC3,
+	TYPE_VEC4,
+	TYPE_MAT2,
+	TYPE_MAT3,
+	TYPE_MAT4,
+};
+
+#endif // GLTF_DEFINES_H