import * as spec from '@galacean/effects-specification';
import { MaskMode } from './types';
import type { Material } from './material';
export declare function valIfUndefined<T>(val: any, def: T): T;
export declare function getPreMultiAlpha(blending?: spec.BlendingMode): number;
export declare function setBlendMode(material: Material, blendMode?: number): void;
export declare function setSideMode(material: Material, side: spec.SideMode): void;
export declare function setMaskMode(material: Material, maskMode: MaskMode): void;