import type { vec2, vec3, vec4 } from '@galacean/effects-specification';
import { Vector3 } from '@galacean/effects-math/es/core/vector3';
import { Ray } from '@galacean/effects-math/es/core/ray';
import type { TriangleLike } from '@galacean/effects-math/es/core/type';
import type { Camera } from '../camera';
export type vec = number[];
export declare function ensureVec3(num?: any): vec3;
export declare function vecFill<T extends vec | vec3 | vec4 | vec2>(out: T | number[], number: number): T;
export declare function vecMulCombine<T extends vec | vec3 | vec4 | vec2>(out: T | number[] | Float32Array, a?: T, b?: T): T;
export declare const particleOriginTranslateMap: Record<number, vec2>;
export declare function nearestPowerOfTwo(value: number): number;
export declare function setRayFromCamera(x: number, y: number, camera: Camera): Ray;
export declare function trianglesFromRect(position: Vector3, halfWidth: number, halfHeight: number): TriangleLike[];
export declare function decimalEqual(a: number, b: number, epsilon?: number): boolean;
export declare function numberToFix(a: number, fixed?: number): number;