/*!
 * Copyright (c) Microsoft Corporation.
 * Licensed under the MIT License.
 */
import { vec3 } from "gl-matrix";
import { Core } from "../../main.js";
import { AABB } from "./aabb.js";
import { Hittable } from "./hittable.js";
export declare const SplitMethod: {
    readonly middle: "middle";
    readonly equalCounts: "equalCounts";
    readonly sah: "sah";
};
export type SplitMethod = (typeof SplitMethod)[keyof typeof SplitMethod];
export declare class LinearBVHNode {
    bounds: AABB;
    primitivesOffset: number;
    secondChildOffset: number;
    nPrimitives: number;
    axis: number;
    private _centroid;
    private _size;
    constructor();
    toBuffer(buffer: LinearBVHNodeBufferData, index: number): void;
}
export declare class BVHAccel {
    private _core;
    private _maxPrimsInNode;
    private _splitMethod;
    private _primitives;
    private _orderedPrimitives;
    get orderedPrimitives(): Hittable[];
    private _primitiveInfo;
    private _totalNodes;
    private _nodes;
    get nodes(): LinearBVHNode[];
    private _offset;
    private _normalized;
    constructor(core: Core, primitives: Hittable[], maxPrimsInNode: number, splitMethod: SplitMethod);
    private _recursiveBuild;
    private _flattenBVHTree;
}
export declare class LinearBVHNodeBufferData extends Float32Array {
    static readonly SIZE: number;
    readonly CENTER_OFFSET: number;
    readonly SIZE_OFFSET: number;
    readonly PRIMITIVES_OFFSET_OFFSET: number;
    readonly SECOND_CHILD_OFFSET_OFFSET: number;
    readonly N_PRIMITIVES_OFFSET: number;
    readonly AXIS_OFFSET: number;
    constructor(count: number);
    getCenter(index: number, value: vec3): void;
    setCenter(index: number, value: vec3): void;
    getSize(index: number, value: vec3): void;
    setSize(index: number, value: vec3): void;
    getPrimitivesOffset(index: number): number;
    setPrimitivesOffset(index: number, value: number): void;
    getSecondChildOffset(index: number): number;
    setSecondChildOffset(index: number, value: number): void;
    getNPrimitives(index: number): number;
    setNPrimitives(index: number, value: number): void;
    getAxis(index: number): number;
    setAxis(index: number, value: number): void;
}