import { GLContext } from "nanogl/types";
/**
 * List of supported formats by a Basis decoder, given a .ktx2 file
 */
export declare type SupportedFormats = {
    s3tc: boolean;
    etc1: boolean;
    etc2: boolean;
    pvrtc: boolean;
    astc: boolean;
    bptc: boolean;
};
export declare type DecodingResponseFormat = {
    format: number;
    uncompressed?: boolean;
    type?: number;
};
export declare type DecodingResponseLevel = {
    level: number;
    offset: number;
    size: number;
    width: number;
    height: number;
};
/**
 * Response from a BasisDecoder request that succeed
 */
export declare type DecodingResponse = {
    /**
     * Request id
     */
    id: number;
    /**
     * ArrayBuffer containing the decoded basis file
     */
    buffer: ArrayBuffer;
    /**
     * ArrayBuffer containing the alpha data, if any
     */
    alphaBuffer: ArrayBuffer | null;
    /**
     * WebGL format of the decoded image
     */
    webglFormat: DecodingResponseFormat;
    /**
     * Array of mip levels needed for this image
     */
    mipLevels: DecodingResponseLevel[];
    /**
     * True if the basis file has alpha data
     */
    hasAlpha: boolean;
};
/**
 * Response from a BasisDecoder request that failed
 */
export declare type DecodingError = {
    /**
     * Request id
     */
    id: number;
    /**
     * Error message
     */
    error: string;
};
/**
 * Response from a BasisDecoder request, either a DecodingResponse in case of succeed or a DecodingError in case of failure
 */
export declare type WorkerResponse = DecodingResponse | DecodingError;
/**
 * Interface for a decoder that can be used to decode a basis file (for .ktx2 files)
 */
export interface IBasisDecoder {
    /**
     * Decode a basis file
     * @param gl GL context
     * @param buffer ArrayBuffer containing the basis file
     */
    decode(gl: GLContext, buffer: ArrayBuffer): Promise<DecodingResponse>;
}