declare module BABYLON {
    /**
     * Mode that determines the coordinate system to use.
     */
    enum GLTFLoaderCoordinateSystemMode {
        /**
         * Automatically convert the glTF right-handed data to the appropriate system based on the current coordinate system mode of the scene.
         */
        AUTO = 0,
        /**
         * Sets the useRightHandedSystem flag on the scene.
         */
        FORCE_RIGHT_HANDED = 1
    }
    /**
     * Mode that determines what animations will start.
     */
    enum GLTFLoaderAnimationStartMode {
        /**
         * No animation will start.
         */
        NONE = 0,
        /**
         * The first animation will start.
         */
        FIRST = 1,
        /**
         * All animations will start.
         */
        ALL = 2
    }
    /**
     * Interface that contains the data for the glTF asset.
     */
    interface IGLTFLoaderData {
        /**
         * JSON that represents the glTF.
         */
        json: Object;
        /**
         * The BIN chunk of a binary glTF
         */
        bin: Nullable<ArrayBufferView>;
    }
    /**
     * Interface for extending the loader.
     */
    interface IGLTFLoaderExtension {
        /**
         * The name of this extension.
         */
        readonly name: string;
        /**
         * Defines whether this extension is enabled.
         */
        enabled: boolean;
    }
    /**
     * Loader state.
     */
    enum GLTFLoaderState {
        /**
         * The asset is loading.
         */
        LOADING = 0,
        /**
         * The asset is ready for rendering.
         */
        READY = 1,
        /**
         * The asset is completely loaded.
         */
        COMPLETE = 2
    }
    /** @hidden */
    interface IGLTFLoader extends IDisposable {
        readonly state: Nullable<GLTFLoaderState>;
        importMeshAsync: (meshesNames: any, scene: Scene, data: IGLTFLoaderData, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void) => Promise<{
            meshes: AbstractMesh[];
            particleSystems: IParticleSystem[];
            skeletons: Skeleton[];
            animationGroups: AnimationGroup[];
        }>;
        loadAsync: (scene: Scene, data: IGLTFLoaderData, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void) => Promise<void>;
    }
    /**
     * File loader for loading glTF files into a scene.
     */
    class GLTFFileLoader implements IDisposable, ISceneLoaderPluginAsync, ISceneLoaderPluginFactory {
        /** @hidden */
        static _CreateGLTFLoaderV1: (parent: GLTFFileLoader) => IGLTFLoader;
        /** @hidden */
        static _CreateGLTFLoaderV2: (parent: GLTFFileLoader) => IGLTFLoader;
        /**
         * Raised when the asset has been parsed
         */
        onParsedObservable: Observable<IGLTFLoaderData>;
        private _onParsedObserver;
        /**
         * Raised when the asset has been parsed
         */
        onParsed: (loaderData: IGLTFLoaderData) => void;
        /**
         * Set this property to false to disable incremental loading which delays the loader from calling the success callback until after loading the meshes and shaders.
         * Textures always loads asynchronously. For example, the success callback can compute the bounding information of the loaded meshes when incremental loading is disabled.
         * Defaults to true.
         * @hidden
         */
        static IncrementalLoading: boolean;
        /**
         * Set this property to true in order to work with homogeneous coordinates, available with some converters and exporters.
         * Defaults to false. See https://en.wikipedia.org/wiki/Homogeneous_coordinates.
         * @hidden
         */
        static HomogeneousCoordinates: boolean;
        /**
         * The coordinate system mode. Defaults to AUTO.
         */
        coordinateSystemMode: GLTFLoaderCoordinateSystemMode;
        /**
        * The animation start mode. Defaults to FIRST.
        */
        animationStartMode: GLTFLoaderAnimationStartMode;
        /**
         * Defines if the loader should compile materials before raising the success callback. Defaults to false.
         */
        compileMaterials: boolean;
        /**
         * Defines if the loader should also compile materials with clip planes. Defaults to false.
         */
        useClipPlane: boolean;
        /**
         * Defines if the loader should compile shadow generators before raising the success callback. Defaults to false.
         */
        compileShadowGenerators: boolean;
        /**
         * Defines if the Alpha blended materials are only applied as coverage.
         * If false, (default) The luminance of each pixel will reduce its opacity to simulate the behaviour of most physical materials.
         * If true, no extra effects are applied to transparent pixels.
         */
        transparencyAsCoverage: boolean;
        /** @hidden */
        _normalizeAnimationGroupsToBeginAtZero: boolean;
        /**
         * Function called before loading a url referenced by the asset.
         */
        preprocessUrlAsync: (url: string) => Promise<string>;
        /**
         * Observable raised when the loader creates a mesh after parsing the glTF properties of the mesh.
         */
        readonly onMeshLoadedObservable: Observable<AbstractMesh>;
        private _onMeshLoadedObserver;
        /**
         * Callback raised when the loader creates a mesh after parsing the glTF properties of the mesh.
         */
        onMeshLoaded: (mesh: AbstractMesh) => void;
        /**
         * Observable raised when the loader creates a texture after parsing the glTF properties of the texture.
         */
        readonly onTextureLoadedObservable: Observable<BaseTexture>;
        private _onTextureLoadedObserver;
        /**
         * Callback raised when the loader creates a texture after parsing the glTF properties of the texture.
         */
        onTextureLoaded: (texture: BaseTexture) => void;
        /**
         * Observable raised when the loader creates a material after parsing the glTF properties of the material.
         */
        readonly onMaterialLoadedObservable: Observable<Material>;
        private _onMaterialLoadedObserver;
        /**
         * Callback raised when the loader creates a material after parsing the glTF properties of the material.
         */
        onMaterialLoaded: (material: Material) => void;
        /**
         * Observable raised when the loader creates a camera after parsing the glTF properties of the camera.
         */
        readonly onCameraLoadedObservable: Observable<Camera>;
        private _onCameraLoadedObserver;
        /**
         * Callback raised when the loader creates a camera after parsing the glTF properties of the camera.
         */
        onCameraLoaded: (camera: Camera) => void;
        /**
         * Observable raised when the asset is completely loaded, immediately before the loader is disposed.
         * For assets with LODs, raised when all of the LODs are complete.
         * For assets without LODs, raised when the model is complete, immediately after the loader resolves the returned promise.
         */
        readonly onCompleteObservable: Observable<void>;
        private _onCompleteObserver;
        /**
         * Callback raised when the asset is completely loaded, immediately before the loader is disposed.
         * For assets with LODs, raised when all of the LODs are complete.
         * For assets without LODs, raised when the model is complete, immediately after the loader resolves the returned promise.
         */
        onComplete: () => void;
        /**
         * Observable raised when an error occurs.
         */
        readonly onErrorObservable: Observable<any>;
        private _onErrorObserver;
        /**
         * Callback raised when an error occurs.
         */
        onError: (reason: any) => void;
        /**
         * Observable raised after the loader is disposed.
         */
        readonly onDisposeObservable: Observable<void>;
        private _onDisposeObserver;
        /**
         * Callback raised after the loader is disposed.
         */
        onDispose: () => void;
        /**
         * Observable raised after a loader extension is created.
         * Set additional options for a loader extension in this event.
         */
        readonly onExtensionLoadedObservable: Observable<IGLTFLoaderExtension>;
        private _onExtensionLoadedObserver;
        /**
         * Callback raised after a loader extension is created.
         */
        onExtensionLoaded: (extension: IGLTFLoaderExtension) => void;
        /**
         * Returns a promise that resolves when the asset is completely loaded.
         * @returns a promise that resolves when the asset is completely loaded.
         */
        whenCompleteAsync(): Promise<void>;
        /**
         * The loader state or null if the loader is not active.
         */
        readonly loaderState: Nullable<GLTFLoaderState>;
        /**
         * Defines if the loader logging is enabled.
         */
        loggingEnabled: boolean;
        /**
         * Defines if the loader should capture performance counters.
         */
        capturePerformanceCounters: boolean;
        private _loader;
        /**
         * Name of the loader ("gltf")
         */
        name: string;
        /**
         * Supported file extensions of the loader (.gltf, .glb)
         */
        extensions: ISceneLoaderPluginExtensions;
        /**
         * Disposes the loader, releases resources during load, and cancels any outstanding requests.
         */
        dispose(): void;
        /** @hidden */
        _clear(): void;
        /**
         * Imports one or more meshes from the loaded glTF data and adds them to the scene
         * @param meshesNames a string or array of strings of the mesh names that should be loaded from the file
         * @param scene the scene the meshes should be added to
         * @param data the glTF data to load
         * @param rootUrl root url to load from
         * @param onProgress event that fires when loading progress has occured
         * @returns a promise containg the loaded meshes, particles, skeletons and animations
         */
        importMeshAsync(meshesNames: any, scene: Scene, data: any, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void): Promise<{
            meshes: AbstractMesh[];
            particleSystems: IParticleSystem[];
            skeletons: Skeleton[];
            animationGroups: AnimationGroup[];
        }>;
        /**
         * Imports all objects from the loaded glTF data and adds them to the scene
         * @param scene the scene the objects should be added to
         * @param data the glTF data to load
         * @param rootUrl root url to load from
         * @param onProgress event that fires when loading progress has occured
         * @returns a promise which completes when objects have been loaded to the scene
         */
        loadAsync(scene: Scene, data: string | ArrayBuffer, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void): Promise<void>;
        /**
         * Load into an asset container.
         * @param scene The scene to load into
         * @param data The data to import
         * @param rootUrl The root url for scene and resources
         * @param onProgress The callback when the load progresses
         * @returns The loaded asset container
         */
        loadAssetContainerAsync(scene: Scene, data: string | ArrayBuffer, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void): Promise<AssetContainer>;
        /**
         * If the data string can be loaded directly.
         * @param data string contianing the file data
         * @returns if the data can be loaded directly
         */
        canDirectLoad(data: string): boolean;
        /**
         * Rewrites a url by combining a root url and response url.
         */
        rewriteRootURL: (rootUrl: string, responseURL?: string) => string;
        /**
         * Instantiates a glTF file loader plugin.
         * @returns the created plugin
         */
        createPlugin(): ISceneLoaderPlugin | ISceneLoaderPluginAsync;
        private _parse;
        private _getLoader;
        private _parseBinary;
        private _parseV1;
        private _parseV2;
        private static _parseVersion;
        private static _compareVersion;
        private static _decodeBufferToText;
        private static readonly _logSpaces;
        private _logIndentLevel;
        private _loggingEnabled;
        /** @hidden */
        _log: (message: string) => void;
        /** @hidden */
        _logOpen(message: string): void;
        /** @hidden */
        _logClose(): void;
        private _logEnabled;
        private _logDisabled;
        private _capturePerformanceCounters;
        /** @hidden */
        _startPerformanceCounter: (counterName: string) => void;
        /** @hidden */
        _endPerformanceCounter: (counterName: string) => void;
        private _startPerformanceCounterEnabled;
        private _startPerformanceCounterDisabled;
        private _endPerformanceCounterEnabled;
        private _endPerformanceCounterDisabled;
    }
}



declare module BABYLON.GLTF2 {
    /** @hidden */
    interface _IArrayItem {
        _index: number;
    }
    /** @hidden */
    interface _ILoaderAccessor extends IAccessor, _IArrayItem {
        _data?: Promise<ArrayBufferView>;
        _babylonVertexBuffer?: Promise<VertexBuffer>;
    }
    /** @hidden */
    interface _ILoaderAnimationChannel extends IAnimationChannel, _IArrayItem {
    }
    /** @hidden */
    interface _ILoaderAnimationSamplerData {
        input: Float32Array;
        interpolation: AnimationSamplerInterpolation;
        output: Float32Array;
    }
    /** @hidden */
    interface _ILoaderAnimationSampler extends IAnimationSampler, _IArrayItem {
        _data?: Promise<_ILoaderAnimationSamplerData>;
    }
    /** @hidden */
    interface _ILoaderAnimation extends IAnimation, _IArrayItem {
        channels: _ILoaderAnimationChannel[];
        samplers: _ILoaderAnimationSampler[];
        _babylonAnimationGroup?: AnimationGroup;
    }
    /** @hidden */
    interface _ILoaderBuffer extends IBuffer, _IArrayItem {
        _data?: Promise<ArrayBufferView>;
    }
    /** @hidden */
    interface _ILoaderBufferView extends IBufferView, _IArrayItem {
        _data?: Promise<ArrayBufferView>;
        _babylonBuffer?: Promise<Buffer>;
    }
    /** @hidden */
    interface _ILoaderCamera extends ICamera, _IArrayItem {
    }
    /** @hidden */
    interface _ILoaderImage extends IImage, _IArrayItem {
        _data?: Promise<ArrayBufferView>;
    }
    /** @hidden */
    interface _ILoaderMaterial extends IMaterial, _IArrayItem {
        _babylonData?: {
            [drawMode: number]: {
                material: Material;
                meshes: AbstractMesh[];
                loaded: Promise<void>;
            };
        };
    }
    /** @hidden */
    interface _ILoaderMesh extends IMesh, _IArrayItem {
        primitives: _ILoaderMeshPrimitive[];
    }
    /** @hidden */
    interface _ILoaderMeshPrimitive extends IMeshPrimitive, _IArrayItem {
    }
    /** @hidden */
    interface _ILoaderNode extends INode, _IArrayItem {
        _parent?: _ILoaderNode;
        _babylonMesh?: Mesh;
        _primitiveBabylonMeshes?: Mesh[];
        _babylonBones?: Bone[];
        _numMorphTargets?: number;
    }
    /** @hidden */
    interface _ILoaderSamplerData {
        noMipMaps: boolean;
        samplingMode: number;
        wrapU: number;
        wrapV: number;
    }
    /** @hidden */
    interface _ILoaderSampler extends ISampler, _IArrayItem {
        _data?: _ILoaderSamplerData;
    }
    /** @hidden */
    interface _ILoaderScene extends IScene, _IArrayItem {
    }
    /** @hidden */
    interface _ILoaderSkin extends ISkin, _IArrayItem {
        _babylonSkeleton?: Skeleton;
        _loaded?: Promise<void>;
    }
    /** @hidden */
    interface _ILoaderTexture extends ITexture, _IArrayItem {
    }
    /** @hidden */
    interface _ILoaderGLTF extends IGLTF {
        accessors?: _ILoaderAccessor[];
        animations?: _ILoaderAnimation[];
        buffers?: _ILoaderBuffer[];
        bufferViews?: _ILoaderBufferView[];
        cameras?: _ILoaderCamera[];
        images?: _ILoaderImage[];
        materials?: _ILoaderMaterial[];
        meshes?: _ILoaderMesh[];
        nodes?: _ILoaderNode[];
        samplers?: _ILoaderSampler[];
        scenes?: _ILoaderScene[];
        skins?: _ILoaderSkin[];
        textures?: _ILoaderTexture[];
    }
}


/**
 * Defines the module used to import/export glTF 2.0 assets
 */
declare module BABYLON.GLTF2 {
    /** @hidden */
    class _ArrayItem {
        static Assign(values?: _IArrayItem[]): void;
    }
    /** @hidden */
    class GLTFLoader implements IGLTFLoader {
        _parent: GLTFFileLoader;
        _gltf: _ILoaderGLTF;
        _babylonScene: Scene;
        _completePromises: Promise<void>[];
        private _disposed;
        private _state;
        private _extensions;
        private _rootUrl;
        private _rootBabylonMesh;
        private _defaultSampler;
        private _defaultBabylonMaterials;
        private _progressCallback?;
        private _requests;
        private static _ExtensionNames;
        private static _ExtensionFactories;
        static _Register(name: string, factory: (loader: GLTFLoader) => GLTFLoaderExtension): void;
        readonly state: Nullable<GLTFLoaderState>;
        constructor(parent: GLTFFileLoader);
        dispose(): void;
        importMeshAsync(meshesNames: any, scene: Scene, data: IGLTFLoaderData, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void): Promise<{
            meshes: AbstractMesh[];
            particleSystems: IParticleSystem[];
            skeletons: Skeleton[];
            animationGroups: AnimationGroup[];
        }>;
        loadAsync(scene: Scene, data: IGLTFLoaderData, rootUrl: string, onProgress?: (event: SceneLoaderProgressEvent) => void): Promise<void>;
        private _loadAsync;
        private _loadData;
        private _setupData;
        private _loadExtensions;
        private _checkExtensions;
        private _setState;
        private _createRootNode;
        _loadSceneAsync(context: string, scene: _ILoaderScene): Promise<void>;
        private _forEachPrimitive;
        private _getMeshes;
        private _getSkeletons;
        private _getAnimationGroups;
        private _startAnimations;
        _loadNodeAsync(context: string, node: _ILoaderNode): Promise<void>;
        private _loadMeshAsync;
        private _loadPrimitiveAsync;
        private _loadVertexDataAsync;
        private _createMorphTargets;
        private _loadMorphTargetsAsync;
        private _loadMorphTargetVertexDataAsync;
        private static _LoadTransform;
        private _loadSkinAsync;
        private _loadBones;
        private _loadBone;
        private _loadSkinInverseBindMatricesDataAsync;
        private _updateBoneMatrices;
        private _getNodeMatrix;
        private _loadCamera;
        private _loadAnimationsAsync;
        private _loadAnimationAsync;
        private _loadAnimationChannelAsync;
        private _loadAnimationSamplerAsync;
        private _loadBufferAsync;
        _loadBufferViewAsync(context: string, bufferView: _ILoaderBufferView): Promise<ArrayBufferView>;
        private _loadIndicesAccessorAsync;
        private _loadFloatAccessorAsync;
        _loadVertexBufferViewAsync(context: string, bufferView: _ILoaderBufferView, kind: string): Promise<Buffer>;
        private _loadVertexAccessorAsync;
        private _getDefaultMaterial;
        private _loadMaterialMetallicRoughnessPropertiesAsync;
        _loadMaterialAsync(context: string, material: _ILoaderMaterial, mesh: _ILoaderMesh, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Promise<void>;
        _loadMaterialPropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: Material): Promise<void>;
        _createMaterial(name: string, drawMode: number): PBRMaterial;
        _loadMaterialBasePropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: PBRMaterial): Promise<void>;
        _loadMaterialAlphaProperties(context: string, material: _ILoaderMaterial, babylonMaterial: PBRMaterial): void;
        _loadTextureInfoAsync(context: string, textureInfo: ITextureInfo, assign: (babylonTexture: Texture) => void): Promise<void>;
        _loadTextureAsync(context: string, texture: _ILoaderTexture, assign: (babylonTexture: Texture) => void): Promise<void>;
        private _loadSampler;
        _loadImageAsync(context: string, image: _ILoaderImage): Promise<ArrayBufferView>;
        _loadUriAsync(context: string, uri: string): Promise<ArrayBufferView>;
        private _onProgress;
        static _GetProperty<T>(context: string, array: ArrayLike<T> | undefined, index: number | undefined): T;
        private static _GetTextureWrapMode;
        private static _GetTextureSamplingMode;
        private static _GetTypedArray;
        private static _GetNumComponents;
        private static _ValidateUri;
        private static _GetDrawMode;
        private _compileMaterialsAsync;
        private _compileShadowGeneratorsAsync;
        _applyExtensions<T>(actionAsync: (extension: GLTFLoaderExtension) => Nullable<Promise<T>>): Nullable<Promise<T>>;
        _forEachExtensions(action: (extension: GLTFLoaderExtension) => void): void;
    }
}


declare module BABYLON.GLTF2 {
    /**
     * Abstract class that can be implemented to extend existing glTF loader behavior.
     */
    abstract class GLTFLoaderExtension implements IGLTFLoaderExtension, IDisposable {
        /**
         * Gets or sets a boolean indicating if the extension is enabled
         */
        enabled: boolean;
        /**
         * Gets or sets extension name
         */
        abstract readonly name: string;
        protected _loader: GLTFLoader;
        /**
         * Creates new GLTFLoaderExtension
         * @param loader defines the GLTFLoader to use
         */
        constructor(loader: GLTFLoader);
        /**
         * Release all resources
         */
        dispose(): void;
        /**
         * Override this method to do work after the state changes to LOADING.
         */
        protected _onLoading(): void;
        /**
         * Override this method to do work after the state changes to READY.
         */
        protected _onReady(): void;
        /**
         * Override this method to modify the default behavior for loading scenes.
         * @hidden
         */
        protected _loadSceneAsync(context: string, node: _ILoaderScene): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading nodes.
         * @hidden
         */
        protected _loadNodeAsync(context: string, node: _ILoaderNode): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading mesh primitive vertex data.
         * @hidden
         */
        protected _loadVertexDataAsync(context: string, primitive: _ILoaderMeshPrimitive, babylonMesh: Mesh): Nullable<Promise<Geometry>>;
        /**
         * Override this method to modify the default behavior for loading materials.
         * @hidden
         */
        protected _loadMaterialAsync(context: string, material: _ILoaderMaterial, mesh: _ILoaderMesh, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading material properties.
         * @hidden
         */
        protected _loadMaterialPropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: Material): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading texture infos.
         * @hidden
         */
        protected _loadTextureInfoAsync(context: string, textureInfo: ITextureInfo, assign: (babylonTexture: Texture) => void): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading textures.
         * @hidden
         */
        protected _loadTextureAsync(context: string, texture: _ILoaderTexture, assign: (babylonTexture: Texture) => void): Nullable<Promise<void>>;
        /**
         * Override this method to modify the default behavior for loading uris.
         * @hidden
         */
        protected _loadUriAsync(context: string, uri: string): Nullable<Promise<ArrayBufferView>>;
        /**
         * Helper method called by a loader extension to load an glTF extension.
         * @hidden
         */
        protected _loadExtensionAsync<TProperty, TResult = void>(context: string, property: IProperty, actionAsync: (extensionContext: string, extension: TProperty) => Nullable<Promise<TResult>>): Nullable<Promise<TResult>>;
        /**
         * Helper method called by the loader to allow extensions to override loading scenes.
         * @hidden
         */
        protected _loadExtrasValueAsync<TProperty, TResult = void>(context: string, property: IProperty, actionAsync: (extensionContext: string, value: TProperty) => Nullable<Promise<TResult>>): Nullable<Promise<TResult>>;
        /**
         * Helper method called by the loader after the state changes to LOADING.
         * @hidden
         */
        static _OnLoading(loader: GLTFLoader): void;
        /**
         * Helper method called by the loader after the state changes to READY.
         * @hidden
         */
        static _OnReady(loader: GLTFLoader): void;
        /**
         * Helper method called by the loader to allow extensions to override loading scenes.
         * @hidden
         */
        static _LoadSceneAsync(loader: GLTFLoader, context: string, scene: _ILoaderScene): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading nodes.
         * @hidden
         */
        static _LoadNodeAsync(loader: GLTFLoader, context: string, node: _ILoaderNode): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading mesh primitive vertex data.
         * @hidden
         */
        static _LoadVertexDataAsync(loader: GLTFLoader, context: string, primitive: _ILoaderMeshPrimitive, babylonMesh: Mesh): Nullable<Promise<Geometry>>;
        /**
         * Helper method called by the loader to allow extensions to override loading materials.
         * @hidden
         */
        static _LoadMaterialAsync(loader: GLTFLoader, context: string, material: _ILoaderMaterial, mesh: _ILoaderMesh, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading material properties.
         * @hidden
         */
        static _LoadMaterialPropertiesAsync(loader: GLTFLoader, context: string, material: _ILoaderMaterial, babylonMaterial: Material): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading texture infos.
         * @hidden
         */
        static _LoadTextureInfoAsync(loader: GLTFLoader, context: string, textureInfo: ITextureInfo, assign: (babylonTexture: Texture) => void): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading textures.
         * @hidden
         */
        static _LoadTextureAsync(loader: GLTFLoader, context: string, texture: _ILoaderTexture, assign: (babylonTexture: Texture) => void): Nullable<Promise<void>>;
        /**
         * Helper method called by the loader to allow extensions to override loading uris.
         * @hidden
         */
        static _LoadUriAsync(loader: GLTFLoader, context: string, uri: string): Nullable<Promise<ArrayBufferView>>;
    }
}
/**
 * Defines the module of the glTF 2.0 loader extensions.
 */
declare module BABYLON.GLTF2.Extensions {
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Vendor/MSFT_lod)
     */
    class MSFT_lod extends GLTFLoaderExtension {
        readonly name: string;
        /**
         * Maximum number of LODs to load, starting from the lowest LOD.
         */
        maxLODsToLoad: number;
        /**
         * Observable raised when all node LODs of one level are loaded.
         * The event data is the index of the loaded LOD starting from zero.
         * Dispose the loader to cancel the loading of the next level of LODs.
         */
        onNodeLODsLoadedObservable: Observable<number>;
        /**
         * Observable raised when all material LODs of one level are loaded.
         * The event data is the index of the loaded LOD starting from zero.
         * Dispose the loader to cancel the loading of the next level of LODs.
         */
        onMaterialLODsLoadedObservable: Observable<number>;
        private _nodeIndexLOD;
        private _nodeSignalLODs;
        private _nodePromiseLODs;
        private _materialIndexLOD;
        private _materialSignalLODs;
        private _materialPromiseLODs;
        dispose(): void;
        protected _onReady(): void;
        protected _loadNodeAsync(context: string, node: _ILoaderNode): Nullable<Promise<void>>;
        protected _loadMaterialAsync(context: string, material: _ILoaderMaterial, mesh: _ILoaderMesh, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Nullable<Promise<void>>;
        protected _loadUriAsync(context: string, uri: string): Nullable<Promise<ArrayBufferView>>;
        /**
         * Gets an array of LOD properties from lowest to highest.
         */
        private _getLODs;
        private _disposeUnusedMaterials;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /** @hidden */
    class MSFT_minecraftMesh extends GLTFLoaderExtension {
        readonly name: string;
        protected _loadMaterialAsync(context: string, material: _ILoaderMaterial, mesh: _ILoaderMesh, babylonMesh: Mesh, babylonDrawMode: number, assign: (babylonMaterial: Material) => void): Nullable<Promise<void>>;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /** @hidden */
    class MSFT_sRGBFactors extends GLTFLoaderExtension {
        readonly name: string;
        protected _loadMaterialPropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: Material): Nullable<Promise<void>>;
        private _convertColorsToLinear;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_draco_mesh_compression)
     */
    class KHR_draco_mesh_compression extends GLTFLoaderExtension {
        readonly name: string;
        private _dracoCompression;
        constructor(loader: GLTFLoader);
        dispose(): void;
        protected _loadVertexDataAsync(context: string, primitive: _ILoaderMeshPrimitive, babylonMesh: Mesh): Nullable<Promise<Geometry>>;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_pbrSpecularGlossiness)
     */
    class KHR_materials_pbrSpecularGlossiness extends GLTFLoaderExtension {
        readonly name: string;
        protected _loadMaterialPropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: Material): Nullable<Promise<void>>;
        private _loadSpecularGlossinessPropertiesAsync;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/KhronosGroup/glTF/tree/master/extensions/2.0/Khronos/KHR_materials_unlit)
     */
    class KHR_materials_unlit extends GLTFLoaderExtension {
        readonly name: string;
        protected _loadMaterialPropertiesAsync(context: string, material: _ILoaderMaterial, babylonMaterial: Material): Nullable<Promise<void>>;
        private _loadUnlitPropertiesAsync;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/MiiBond/glTF/tree/khr_lights_v1/extensions/Khronos/KHR_lights) (Experimental)
     */
    class KHR_lights extends GLTFLoaderExtension {
        readonly name: string;
        private _lights?;
        protected _onLoading(): void;
        protected _loadSceneAsync(context: string, scene: _ILoaderScene): Nullable<Promise<void>>;
        protected _loadNodeAsync(context: string, node: _ILoaderNode): Nullable<Promise<void>>;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](https://github.com/AltspaceVR/glTF/blob/avr-sampler-offset-tile/extensions/2.0/Khronos/KHR_texture_transform/README.md) (Experimental)
     */
    class KHR_texture_transform extends GLTFLoaderExtension {
        readonly name: string;
        protected _loadTextureInfoAsync(context: string, textureInfo: ITextureInfo, assign: (babylonTexture: Texture) => void): Nullable<Promise<void>>;
    }
}


declare module BABYLON.GLTF2.Extensions {
    /**
     * [Specification](TODO) (Experimental)
     */
    class EXT_lights_imageBased extends GLTFLoaderExtension {
        readonly name: string;
        private _lights?;
        protected _onLoading(): void;
        protected _loadSceneAsync(context: string, scene: _ILoaderScene): Nullable<Promise<void>>;
        private _loadLightAsync;
    }
}