import * as THREE from 'three/webgpu';
import type { TSLFloatNode, TSLTextureNode, TSLUniformNode, TSLVec3Node } from '../types/tsl.cjs';
import type { WaterVolume } from '../Simulation/MPM/WaterVolume.cjs';
type WaterFloatUniform = TSLUniformNode<'float', number>;
type WaterVec3Uniform = TSLUniformNode<'vec3', THREE.Vector3>;
export interface WaterCausticsOptions {
    resolution?: number | undefined;
    intensity?: number | undefined;
    chromatic?: boolean | undefined;
    temporal?: number | boolean | undefined;
}
export interface WaterCausticsUniforms {
    sunDirection: WaterVec3Uniform;
    intensity: WaterFloatUniform;
    absorption: WaterFloatUniform;
    temporal: WaterFloatUniform;
    historyValid: WaterFloatUniform;
}
/**
 * Simulation-driven sun caustics and column transmittance for a WaterVolume.
 * A displaced SurfaceField grid conserves source-cell energy while refracting
 * it onto the floor plane; a small temporal resolve settles triangle shimmer.
 *
 * @short Refracted SurfaceField beam-compression caustics + water sun shadow texture.
 * @category Materials
 * @tags WebGPU, TSL, Water, Caustics, Shadows
 */
export declare class WaterCaustics {
    /** Borrowed water simulation that supplies the surface field and transforms. */
    water: WaterVolume;
    /** Width and height of the square caustics targets. */
    resolution: number;
    /** Whether sampling applies a small wavelength-dependent offset. */
    chromatic: boolean;
    /** Mutable sun, intensity, absorption, and temporal uniforms. */
    uniforms: WaterCausticsUniforms;
    private _currentTarget;
    private _historyRead;
    private _historyWrite;
    private _textureNode;
    private _historyInputNode;
    private _scene;
    private _camera;
    private _mesh;
    private _quad;
    private _material;
    private _temporalMaterial;
    private _clearColor;
    private _disposed;
    /** Create simulation-driven caustics for a texture-backed water surface. */
    constructor(water: WaterVolume, { resolution, intensity, chromatic, temporal, }?: WaterCausticsOptions);
    private _buildCausticsMaterial;
    private _buildTemporalMaterial;
    /** Latest resolved caustics and sun-transmittance texture. */
    get texture(): THREE.Texture;
    /** Stable texture node; its backing history texture follows ping-pong swaps. */
    get textureNode(): TSLTextureNode;
    /** Sample RGB caustic irradiance at a world-space receiver position. */
    sample(worldPosition: TSLVec3Node): TSLVec3Node;
    /** Sample column sun transmittance at a world-space receiver position. */
    sampleShadow(worldPosition: TSLVec3Node): TSLFloatNode;
    /** Invalidate temporal caustics history before the next update. */
    resetHistory(): this;
    /** Render the caustic field after the water step and before the scene pass. */
    update(renderer: THREE.Renderer): this;
    /** Dispose all caustics render targets, geometry, and materials. */
    dispose(): void;
}
export default WaterCaustics;