import { Extension, ExtensionProperty, PropertyType, ReaderContext, WriterContext } from "@gltf-transform/core";
export declare const NEEDLE_PROGRESSIVE_EXTENSION_NAME = "NEEDLE_progressive";
export type ProgressiveLoadingInfo = {
    /** guid of the asset the LODs belong to */
    guid: string;
    /** lod infos and paths */
    lods?: Array<LodInfo>;
};
type LodInfo = {
    /** Relative path to the LOD file */
    path: string;
    /**  Hash of the LOD file. It has been generated using the file content and settings */
    hash: string;
};
export type ProgressiveTextureLodEntry = LodInfo & {
    width: number;
    height: number;
};
export type ProgressiveTextureModel = ProgressiveLoadingInfo & {
    lods?: Array<ProgressiveTextureLodEntry>;
};
export type ProgressiveMeshModel = ProgressiveLoadingInfo & {
    lods?: Array<LodInfo & {
        /** @deprecated Mesh vertex density TODO: remove in the future */
        density: number;
        vertexCount: number;
        indexCount: number;
        /** Densities per primitive */
        densities?: Array<number>;
    }>;
};
export declare class NEEDLE_progressive extends Extension {
    static EXTENSION_NAME: string;
    extensionName: string;
    createTexture(data: ProgressiveTextureModel): NEEDLE_progressive_property;
    createMesh(data: ProgressiveMeshModel): NEEDLE_progressive_property;
    read(_context: ReaderContext): this;
    write(context: WriterContext): this;
}
export declare class NEEDLE_progressive_property extends ExtensionProperty {
    static EXTENSION_NAME: string;
    readonly extensionName: string;
    parentTypes: PropertyType[];
    propertyType: string;
    init(): void;
    model: ProgressiveLoadingInfo;
}
export {};