/**
 * A shader effect that darkens the edges of the screen, drawing focus
 * to the center. Commonly used for atmosphere, cinematic feel, or to
 * naturally frame a camera viewport (e.g. minimap).
 * @category Effects
 * @see {@link Renderable.shader} for usage
 * @example
 * // subtle vignette on the main camera
 * app.viewport.shader = new VignetteEffect(renderer);
 * @example
 * // stronger cinematic vignette
 * app.viewport.shader = new VignetteEffect(renderer, {
 *     strength: 0.3,
 *     size: 20.0,
 * });
 */
export default class VignetteEffect extends ShaderEffect {
    /**
     * @param {import("../webgl_renderer.js").default} renderer - the current renderer instance
     * @param {object} [options] - effect options
     * @param {number} [options.strength=0.15] - edge darkening power (lower = stronger darkening, higher = softer falloff)
     * @param {number} [options.size=25.0] - vignette spread multiplier (higher = smaller dark area)
     */
    constructor(renderer: import("../webgl_renderer.js").default, options?: {
        strength?: number | undefined;
        size?: number | undefined;
    });
    strength: number;
    size: number;
    /**
     * set the vignette strength
     * @param {number} strength - edge darkening power (lower = stronger, higher = softer)
     */
    setStrength(strength: number): void;
    /**
     * set the vignette size
     * @param {number} size - spread multiplier (higher = smaller dark area)
     */
    setSize(size: number): void;
}
import ShaderEffect from "../shadereffect.js";
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