import { FragmentShader } from '../../Shader';
export declare const integrateBRDFFragment: FragmentShader<{
    SAMPLE_NUMBER: number;
    PI: number;
}, {
    normalDistribution: {
        type: "sampler2D";
        value: import("../../Texture2D").default;
        semantic: import("../../Shader").UniformSemantic | import("../../Shader").MatrixSemantic | undefined;
    };
    viewportSize: {
        type: "vec2";
        value: import("../../glmatrix/common").Vec2Array;
        semantic: import("../../Shader").UniformSemantic | import("../../Shader").MatrixSemantic | undefined;
    };
}, never>;