import * as spec from '@galacean/effects-specification';
import type { vec2 } from '@galacean/effects-specification';
export type Shape2D = {
    gs?: spec.ShapeGeometry[];
    t: number;
    g: spec.ShapeGeometry;
};
export type GeometryFromShape = {
    aPoint: number[] | Float32Array;
    index: number[] | Uint16Array;
};
type ShapeGeometryPre = {
    p: spec.ShapePoints[1];
    s: spec.ShapeSplits[1];
};
export type ShapeGeometryData = {
    gs: ShapeGeometryPre[];
} | {
    g: ShapeGeometryPre;
} | spec.ShapeGeometry;
export declare function getGeometryTriangles(geometry: spec.ShapeGeometry, options: {
    indexBase?: number;
    uvTransform?: number[];
}): {
    aPoint: Float32Array;
    index: Uint16Array;
};
export declare function getGeometryByShape(shape: ShapeGeometryData, uvTransform?: number[]): GeometryFromShape;
export declare function rotateVec2(out: vec2 | number[], vec2: vec2, angleInRad: number): vec2;
export {};