/**
 * Seeded simplex-noise permutation table + GPU texture upload.
 *
 * Mirrors the `buildPermutationTable` Fisher-Yates shuffle used inside
 * `simplex-noise` so a GLSL simplex3D can reproduce the exact CPU
 * elevation field. Consumed by any shader that wants the same noise
 * sample the CPU uses (e.g. `shaders/glsl/lib/liquidMask.glsl` gates
 * per-fragment effects on the smooth-sphere by comparing the noise to
 * the current sea level).
 */
import * as THREE from 'three';
/** Builds the 512-byte permutation table for a given seed (first 256 bytes
 *  shuffled, duplicated into [256, 511] so `p[jj + p[kk]]` never wraps). */
export declare function buildPermTable(seed: string): Uint8Array;
/** Wraps the perm table as a 512×1 nearest-filter texture the shader can sample. */
export declare function permTableToTexture(perm: Uint8Array): THREE.DataTexture;
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