/**
 * A shader effect that overlays horizontal scanlines on the sprite.
 * Can optionally add barrel distortion and vignette for a full CRT monitor look.
 * @category Effects
 * @see {@link Renderable.shader} for usage
 * @example
 * // simple scanlines
 * mySprite.shader = new ScanlineEffect(renderer, { opacity: 0.3 });
 * @example
 * // full CRT look with curvature and vignette
 * mySprite.shader = new ScanlineEffect(renderer, {
 *     opacity: 0.3,
 *     curvature: 0.02,
 *     vignetteStrength: 0.3,
 * });
 */
export default class ScanlineEffect extends ShaderEffect {
    /**
     * @param {import("../webgl_renderer.js").default} renderer - the current renderer instance
     * @param {object} [options] - effect options
     * @param {number} [options.opacity=0.25] - scanline darkness (0.0 = invisible, 1.0 = fully black lines)
     * @param {number} [options.curvature=0.0] - barrel distortion strength (0.0 = flat, 0.02 = subtle CRT curve)
     * @param {number} [options.vignetteStrength=0.0] - edge darkening strength (0.0 = none, 0.3 = subtle)
     */
    constructor(renderer: import("../webgl_renderer.js").default, options?: {
        opacity?: number | undefined;
        curvature?: number | undefined;
        vignetteStrength?: number | undefined;
    });
    /**
     * set the scanline opacity
     * @param {number} opacity - scanline darkness (0.0–1.0)
     */
    setOpacity(opacity: number): void;
    /**
     * set the barrel curvature strength
     * @param {number} curvature - distortion amount (0.0 = flat)
     */
    setCurvature(curvature: number): void;
    /**
     * set the vignette strength
     * @param {number} strength - edge darkening (0.0 = none)
     */
    setVignetteStrength(strength: number): void;
}
import ShaderEffect from "../shadereffect.js";
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