import { AssetPromise, IndexFormat, Texture2D, TypedArray, VertexElementFormat } from "@galacean/engine-core";
import { Color, Vector2, Vector3, Vector4 } from "@galacean/engine-math";
import { AccessorComponentType, AccessorType, IAccessor, IBufferView, IGLTF, ISampler, ISamplerInfo } from "./GLTFSchema";
import { BufferInfo, GLTFParserContext } from "./parser/GLTFParserContext";
/**
 * @internal
 */
export declare class GLTFUtils {
    static floatBufferToVector2Array(buffer: Float32Array): Vector2[];
    static floatBufferToVector3Array(buffer: Float32Array): Vector3[];
    static floatBufferToVector4Array(buffer: Float32Array): Vector4[];
    static floatBufferToColorArray(buffer: Float32Array, isColor3: boolean): Color[];
    /**
     * Get the number of bytes occupied by accessor type.
     */
    static getAccessorTypeSize(accessorType: AccessorType): number;
    /**
     * Get the TypedArray corresponding to the component type.
     */
    static getComponentType(componentType: AccessorComponentType): Float32ArrayConstructor | Uint32ArrayConstructor | Uint8ArrayConstructor | Uint16ArrayConstructor | Int8ArrayConstructor | Int16ArrayConstructor;
    static getNormalizedComponentScale(componentType: AccessorComponentType): number;
    static getAccessorBuffer(context: GLTFParserContext, bufferViews: IBufferView[], accessor: IAccessor): AssetPromise<BufferInfo>;
    static bufferToVector3Array(buffer: TypedArray, byteOffset: number, count: number, normalized: boolean, componentType: AccessorComponentType): Vector3[];
    static getBufferViewData(bufferView: IBufferView, buffers: ArrayBuffer[]): ArrayBuffer;
    /**
     * Get accessor data.
     */
    static processingSparseData(context: GLTFParserContext, accessor: IAccessor, bufferInfo: BufferInfo): AssetPromise<void>;
    static getIndexFormat(type: AccessorComponentType): IndexFormat;
    static getElementFormat(type: AccessorComponentType, size: number, normalized?: boolean): VertexElementFormat;
    /**
     * Load image buffer
     */
    static loadImageBuffer(imageBuffer: TypedArray, type: string): Promise<HTMLImageElement>;
    /**
     * Parse the glb format.
     */
    static parseGLB(context: GLTFParserContext, originBuffer: ArrayBuffer): {
        glTF?: IGLTF;
        buffers?: ArrayBuffer[];
        originBuffer?: ArrayBuffer;
    };
    static parseSampler(texture: Texture2D, samplerInfo: ISamplerInfo): void;
    static getSamplerInfo(sampler: ISampler): ISamplerInfo;
}