/**
 * Brightness and contrast adjustment
 * https://github.com/evanw/glfx.js
 * brightness: -1 to 1 (-1 is solid black, 0 is no change, and 1 is solid white)
 * contrast: -1 to 1 (-1 is solid gray, 0 is no change, and 1 is maximum contrast)
 */
export declare const BrightnessContrastShader: {
    uniforms: {
        tDiffuse: {
            value: null;
        };
        brightness: {
            value: number;
        };
        contrast: {
            value: number;
        };
    };
    vertexShader: string;
    fragmentShader: string;
};