/**
 * Safari/Firefox-compatible BVH closest point implementation for point clouds.
 *
 * Pointer-free storage traversal for PointsBVH from three-mesh-bvh.
 * Key differences from triangle queries:
 * - Index buffer stores uint (single point index) instead of uvec3 (triangle indices)
 * - No triangle closest point calculation - direct point-to-point distance
 *
 * The key insight is that Safari/Firefox's WebGPU implementation (naga validator)
 * rejects `ptr<storage, ...>` as function parameters. This is part of the
 * `unrestricted_pointer_parameters` WGSL extension that only Chromium supports.
 *
 * Solution: Use TSL Fn() for the main compute entry point that accesses storage
 * buffers via .element(). The storage buffers become module-level bindings
 * and are accessed directly without passing pointers between functions.
 */
import type { NodeBuilder } from 'three/webgpu';
import type { TSLFloatNode, TSLFunction, TSLStorageNode, TSLVec3Node, TSLVec4Node } from '../../types/tsl.cjs';
export interface DistanceSqToBoundsParameters {
    point: TSLVec3Node;
    boundsMin: TSLVec3Node;
    boundsMax: TSLVec3Node;
}
export interface DistanceSqToBoundsWGSLFunction {
    (parameters: DistanceSqToBoundsParameters): TSLFloatNode;
    build(builder: NodeBuilder): void;
}
export type PointsBVHClosestPointArguments = [
    point: TSLVec3Node,
    maxDistance: TSLFloatNode
];
export type PointsBVHClosestPointFunction = TSLFunction<PointsBVHClosestPointArguments, TSLVec4Node>;
/**
 * Computes the squared distance from a point to an AABB.
 */
export declare const distanceSqToBoundsWGSL: DistanceSqToBoundsWGSLFunction;
/**
 * Creates a BVH closest point to point function for point clouds using TSL Fn().
 *
 * This uses the TSL Fn() pattern which:
 * 1. Accesses storage buffers via .element() - generates NodeBuffer_XXX.value[i] syntax
 * 2. Avoids ptr<storage, ...> in function signatures
 * 3. Works on Safari/Firefox WebGPU
 *
 * @param {StorageBufferNode} bvhIndexBuffer - Storage buffer for point indices (uint)
 * @param {StorageBufferNode} bvhPositionBuffer - Storage buffer for point positions (vec3f)
 * @param {StorageBufferNode} bvhNodeBuffer - Storage buffer for BVH nodes (flat f32 array)
 * @returns {Function} A TSL function that computes closest point distance
 */
export declare function createPointsBVHClosestPointFn(bvhIndexBuffer: TSLStorageNode<'uint'>, bvhPositionBuffer: TSLStorageNode<'vec3'>, bvhNodeBuffer: TSLStorageNode<'float'>): PointsBVHClosestPointFunction;