import { ShaderMaterial, WebGLRenderTarget, Texture } from 'three';
export declare const UV_LIGHT_MAP_FLIPPED_ATTRIB_NAME = "uvLightmapFlipped";
export interface RenderTargetsCombineMaterial extends ShaderMaterial {
    uniforms: {
        rt1: {
            value: Texture | null;
        };
        rt2: {
            value: Texture | null;
        };
    };
}
export interface RenderTargetsCombineMatOptions {
    rt1: WebGLRenderTarget;
    rt2: WebGLRenderTarget;
}
export declare function setRenderTargetsCombineMaterial(mat: RenderTargetsCombineMaterial, options: RenderTargetsCombineMatOptions): void;
export declare function createRenderTargetsCombineMaterial(): RenderTargetsCombineMaterial;