/**
 * A shader effect that adds a drop shadow beneath the sprite.
 * Works by sampling the texture at an offset — if the offset position
 * has an opaque pixel but the current position doesn't, the shadow is drawn.
 * @category Effects
 * @see {@link Renderable.shader} for usage
 * @example
 * // dark shadow offset to the bottom-right
 * mySprite.shader = new DropShadowEffect(renderer, {
 *     offsetX: 3.0,
 *     offsetY: 3.0,
 *     color: [0.0, 0.0, 0.0],
 *     opacity: 0.5,
 * });
 */
export default class DropShadowEffect extends ShaderEffect {
    /**
     * @param {import("../webgl_renderer.js").default} renderer - the current renderer instance
     * @param {object} [options] - effect options
     * @param {number} [options.offsetX=2.0] - shadow x offset in texels
     * @param {number} [options.offsetY=2.0] - shadow y offset in texels
     * @param {number[]} [options.color=[0.0, 0.0, 0.0]] - shadow color as [r, g, b] (0.0–1.0)
     * @param {number} [options.opacity=0.5] - shadow opacity (0.0–1.0)
     * @param {number[]} [options.textureSize=[256, 256]] - texture dimensions [width, height]
     */
    constructor(renderer: import("../webgl_renderer.js").default, options?: {
        offsetX?: number | undefined;
        offsetY?: number | undefined;
        color?: number[] | undefined;
        opacity?: number | undefined;
        textureSize?: number[] | undefined;
    });
    /**
     * set the shadow offset
     * @param {number} x - x offset in texels
     * @param {number} y - y offset in texels
     */
    setOffset(x: number, y: number): void;
    /**
     * set the texture size
     * @param {number} width - texture width in pixels
     * @param {number} height - texture height in pixels
     */
    setTextureSize(width: number, height: number): void;
}
import ShaderEffect from "../shadereffect.js";
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