import type { Matrix4 } from '@galacean/effects-math/es/core/index';
import { Vector3 } from '@galacean/effects-math/es/core/index';
import type * as spec from '@galacean/effects-specification';
import type { GradientStop, vec4 } from '@galacean/effects-specification';
import type { Engine } from '../../engine';
import { ValueGetter } from '../../math';
import type { GPUCapability, ShaderWithSource } from '../../render';
import { Geometry, Mesh } from '../../render';
import { Texture } from '../../texture';
export type TrailMeshProps = {
    maxTrailCount: number;
    pointCountPerTrail: number;
    colorOverLifetime?: Array<GradientStop>;
    texture?: Texture;
    minimumVertexDistance: number;
    blending: number;
    widthOverTrail: ValueGetter<number>;
    colorOverTrail?: Array<GradientStop>;
    matrix?: Matrix4;
    opacityOverLifetime: ValueGetter<number>;
    occlusion: boolean;
    transparentOcclusion: boolean;
    lifetime: ValueGetter<number>;
    mask: number;
    shaderCachePrefix: string;
    maskMode: number;
    textureMap: vec4;
    name: string;
};
export type TrailPointOptions = {
    lifetime: number;
    color: number[];
    size: number;
    time: number;
};
export declare class TrailMesh {
    mesh: Mesh;
    maxTrailCount: number;
    geometry: Geometry;
    lifetime: ValueGetter<number>;
    pointCountPerTrail: number;
    minimumVertexDistance: number;
    useAttributeTrailStart: boolean;
    checkVertexDistance: boolean;
    private pointStart;
    private trailCursors;
    constructor(engine: Engine, props: TrailMeshProps);
    get time(): number;
    set time(t: number);
    addPoint(trailIndex: number, position: Vector3, opt: TrailPointOptions): void;
    getTrailPosition(trail: number, index: number, out: Vector3): Vector3 | undefined;
    clearAllTrails(): void;
    minusTime(time: number): void;
    clearTrail(index: number): void;
    getPointStartPos(index: number): Vector3;
    setPointStartPos(index: number, pos: Vector3): void;
    onUpdate(escapeTime: number): any;
}
export declare function getTrailMeshShader(trails: spec.ParticleTrail, particleMaxCount: number, name: string, gpuCapability: GPUCapability, env?: string): ShaderWithSource;