import { AssetPromise, Engine, EngineConfiguration, LoadItem, Loader, ResourceManager, Texture2D, TextureCube } from "@galacean/engine-core";
import { KTX2Container } from "./KTX2Container";
import { KTX2TargetFormat } from "./KTX2TargetFormat";
import { TranscodeResult } from "./transcoder/AbstractTranscoder";
export declare class KTX2Loader extends Loader<Texture2D | TextureCube> {
    private static _binomialLLCTranscoder;
    private static _priorityFormats;
    private static _capabilityMap;
    /**
     * Release ktx2 transcoder worker.
     * @remarks If use loader after releasing, we should release again.
     */
    static release(): void;
    /** @internal */
    static _parseBuffer(buffer: Uint8Array, engine: Engine, params?: KTX2Params): Promise<{
        ktx2Container: KTX2Container;
        engine: Engine;
        result: TranscodeResult;
        targetFormat: KTX2TargetFormat;
        params: Uint8Array;
    }>;
    /** @internal */
    static _createTextureByBuffer(engine: Engine, isSRGB: boolean, transcodeResult: TranscodeResult, targetFormat: KTX2TargetFormat, params?: Uint8Array, restoredTexture?: Texture2D | TextureCube): Texture2D | TextureCube;
    private static _decideTargetFormat;
    private static _detectSupportedFormat;
    private static _getBinomialLLCTranscoder;
    private static _getEngineTextureFormat;
    initialize(_: Engine, configuration: EngineConfiguration): Promise<void>;
    /**
     * @internal
     */
    load(item: LoadItem & {
        params?: KTX2Params;
    }, resourceManager: ResourceManager): AssetPromise<Texture2D | TextureCube>;
}
/**
 * KTX2 loader params interface.
 */
export interface KTX2Params {
    /** Priority transcoding format queue which is preferred options, default is BC7/ASTC/BC3_BC1/ETC/PVRTC/R8G8B8A8. */
    /** @deprecated */
    priorityFormats: KTX2TargetFormat[];
}
declare module "@galacean/engine-core" {
    interface EngineConfiguration {
        /** KTX2 loader options. If set this option and workCount is great than 0, workers will be created. */
        ktx2Loader?: {
            /** Worker count for transcoder, default is 4. */
            workerCount?: number;
            /** Global transcoding format queue which will be used if not specified in per-instance param, default is BC7/ASTC/BC3_BC1/ETC/PVRTC/R8G8B8A8. */
            /** @deprecated */
            priorityFormats?: KTX2TargetFormat[];
        };
    }
}