import { RenderPass } from "./renderPass";
import { EventArgs } from "../events";
import { Viewer } from "../viewer";
export declare class ShadowPass extends RenderPass {
    typeName: string;
    private _shadowTexture;
    private _depthTexture;
    private _projViewMatrix;
    private _directionalLight;
    private rc;
    private frameBuffer;
    private shader;
    private resolution;
    private bias;
    private normalBias;
    private depthScale;
    private needRender;
    get shadowTexture(): WebGLTexture;
    get depthTexture(): WebGLTexture;
    get projViewMatrix(): Float32Array;
    constructor();
    protected onInit(viewer: Viewer, args: EventArgs): void;
    protected beginRender(): void;
    protected endRender(): void;
    protected render(deltaSeconds: number): void;
    update(): void;
    private vs;
    private fs;
}