import { RenderTexture, Texture, vec4, ZograRenderer, IFrameBuffer } from "zogra-renderer";
declare const MaterialBlur_base: new (gl?: WebGL2RenderingContext | undefined) => import("zogra-renderer").Material<import("zogra-renderer").DefaultVertexStruct>;
declare class MaterialBlur extends MaterialBlur_base {
    texture: Texture | null;
    textureSize: vec4;
    sampleOffset: number;
}
export declare class DownsampleBlurRenderer {
    steps: RenderTexture[];
    downsampleMaterial: MaterialBlur;
    upsampleMaterial: MaterialBlur;
    private init;
    blur(texture: Texture, iteration?: number, output?: RenderTexture | IFrameBuffer, ctx?: import("zogra-renderer").GLContext): RenderTexture;
    downSample(renderer: ZograRenderer, input: Texture, iteration: number): void;
    upSample(renderer: ZograRenderer, iteration: number, finalOutput?: RenderTexture | IFrameBuffer): RenderTexture;
}
export {};