import { AssetPromise, BlendShape, Buffer, ContentRestorer, ModelMesh, RequestConfig, Texture2D } from "@galacean/engine-core";
import { Vector2 } from "@galacean/engine-math";
import { GLTFResource } from "./gltf/GLTFResource";
import type { AccessorComponentType, IBufferView } from "./gltf/GLTFSchema";
/**
 * @internal
 */
export declare class GLTFContentRestorer extends ContentRestorer<GLTFResource> {
    isGLB: boolean;
    bufferRequests: BufferRequestInfo[];
    glbBufferSlices: Vector2[];
    bufferTextures: BufferTextureRestoreInfo[];
    meshes: ModelMeshRestoreInfo[];
    restoreContent(): AssetPromise<GLTFResource>;
    private _getBufferData;
}
/**
 * @internal
 */
export declare class BufferRequestInfo {
    url: string;
    config: RequestConfig;
    constructor(url: string, config: RequestConfig);
}
/**
 * @internal
 */
export declare class BufferTextureRestoreInfo {
    texture: Texture2D;
    bufferView: IBufferView;
    mimeType: string;
    constructor(texture: Texture2D, bufferView: IBufferView, mimeType: string);
}
/**
 * @internal
 */
export declare class ModelMeshRestoreInfo {
    mesh: ModelMesh;
    vertexBuffers: BufferRestoreInfo[];
    indexBuffer: BufferDataRestoreInfo;
    blendShapes: BlendShapeRestoreInfo[];
}
/**
 * @internal
 */
export declare class BufferRestoreInfo {
    buffer: Buffer;
    data: BufferDataRestoreInfo;
    constructor(buffer: Buffer, data: BufferDataRestoreInfo);
}
/**
 * @internal
 */
export declare class BufferDataRestoreInfo {
    main: RestoreDataAccessor;
    typeSize?: number;
    sparseCount?: number;
    sparseIndices?: RestoreDataAccessor;
    sparseValues?: RestoreDataAccessor;
    constructor(main: RestoreDataAccessor, typeSize?: number, sparseCount?: number, sparseIndices?: RestoreDataAccessor, sparseValues?: RestoreDataAccessor);
}
/**
 * @internal
 */
export declare class RestoreDataAccessor {
    bufferIndex: number;
    TypedArray: Uint8ArrayConstructor | Int8ArrayConstructor | Int16ArrayConstructor | Uint16ArrayConstructor | Uint32ArrayConstructor | Float32ArrayConstructor;
    byteOffset: number;
    length: number;
    constructor(bufferIndex: number, TypedArray: Uint8ArrayConstructor | Int8ArrayConstructor | Int16ArrayConstructor | Uint16ArrayConstructor | Uint32ArrayConstructor | Float32ArrayConstructor, byteOffset: number, length: number);
}
/**
 * @internal
 */
export declare class BlendShapeRestoreInfo {
    blendShape: BlendShape;
    position: BlendShapeDataRestoreInfo;
    normal?: BlendShapeDataRestoreInfo;
    tangent?: BlendShapeDataRestoreInfo;
    constructor(blendShape: BlendShape, position: BlendShapeDataRestoreInfo, normal?: BlendShapeDataRestoreInfo, tangent?: BlendShapeDataRestoreInfo);
}
/**
 * @internal
 */
export declare class BlendShapeDataRestoreInfo {
    buffer: BufferDataRestoreInfo;
    byteOffset: number;
    count: number;
    normalized: boolean;
    componentType: AccessorComponentType;
    constructor(buffer: BufferDataRestoreInfo, byteOffset: number, count: number, normalized: boolean, componentType: AccessorComponentType);
}