import Texture2D from '../Texture2D';
import TextureCube, { TextureCubeOpts } from '../TextureCube';
import Renderer from '../Renderer';
export declare function prefilterEnvironmentMap(renderer: Renderer, envMap: TextureCube | Texture2D, textureOpts: Partial<TextureCubeOpts> & {
    encodeRGBM?: boolean;
    decodeRGBM?: boolean;
}, normalDistribution?: Texture2D, brdfLookup?: Texture2D): {
    environmentMap: TextureCube;
    brdfLookup: Texture2D;
    normalDistribution: Texture2D;
    maxMipmapLevel: number;
};
export declare function integrateBRDF(renderer: Renderer, normalDistribution: Texture2D): Texture2D;
export declare function generateNormalDistribution(roughnessLevels?: number, sampleSize?: number): Texture2D;