/**
 * Safari/Firefox-compatible BVH closest point implementation with normal output.
 *
 * Legacy packed-buffer query that returns both signed distance and surface
 * normal for callers that have not migrated to BVHComputeData yet.
 *
 * Returns vec4(signedDistance, normalX, normalY, normalZ) for direct use
 * in particle boundary constraints without SDF precomputation.
 */
import type { NodeBuilder } from 'three/webgpu';
import type { TSLFloatNode, TSLFunction, TSLStorageNode, TSLVec3Node, TSLVec4Node } from '../../types/tsl.js';
export interface TriangleClosestPointParameters {
    p: TSLVec3Node;
    v0: TSLVec3Node;
    v1: TSLVec3Node;
    v2: TSLVec3Node;
}
export interface TriangleDistanceSqToBoundsParameters {
    point: TSLVec3Node;
    boundsMin: TSLVec3Node;
    boundsMax: TSLVec3Node;
}
export interface TriangleClosestPointWGSLFunction {
    (parameters: TriangleClosestPointParameters): TSLVec4Node;
    build(builder: NodeBuilder): void;
}
export interface TriangleDistanceSqToBoundsWGSLFunction {
    (parameters: TriangleDistanceSqToBoundsParameters): TSLFloatNode;
    build(builder: NodeBuilder): void;
}
export type BVHClosestPointWithNormalArguments = [
    point: TSLVec3Node,
    maxDistance: TSLFloatNode
];
export type BVHClosestPointWithNormalFunction = TSLFunction<BVHClosestPointWithNormalArguments, TSLVec4Node>;
/**
 * Computes the closest point on a triangle to a given point.
 * Returns vec4(closestPoint.xyz, unused).
 */
export declare const closestPointToTriangleWGSL: TriangleClosestPointWGSLFunction;
/**
 * Computes the squared distance from a point to an AABB.
 */
export declare const distanceSqToBoundsWGSL: TriangleDistanceSqToBoundsWGSLFunction;
/**
 * Creates a BVH closest point function that returns signed distance AND surface normal.
 *
 * This extended version is designed for constraint systems where you need
 * both the penetration depth and the push direction.
 *
 * 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 triangle indices (uvec3)
 * @param {StorageBufferNode} bvhPositionBuffer - Storage buffer for vertex positions (vec3f)
 * @param {StorageBufferNode} bvhNodeBuffer - Storage buffer for BVH nodes (flat f32 array)
 * @returns {Function} A TSL function that computes closest point with normal
 * @deprecated Use `BVHComputeData` from `three-mesh-bvh/webgpu` with the three-blocks boundary-pass overloads.
 */
export declare function createBVHClosestPointWithNormalFn(bvhIndexBuffer: TSLStorageNode<'uvec3'>, bvhPositionBuffer: TSLStorageNode<'vec3'>, bvhNodeBuffer: TSLStorageNode<'float'>): BVHClosestPointWithNormalFunction;