import type { Color, Vector3 } from '@galacean/effects-math/es/core';
import { Quaternion } from '@galacean/effects-math/es/core/quaternion';
import type { Pose } from './pose';
export declare abstract class BlendFunction {
    abstract blendVector3(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    abstract blendQuaternion(source: Quaternion, target: Quaternion, weight: number, result: Quaternion): void;
    abstract blendEuler(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    abstract blendColor(source: Color, target: Color, weight: number, result: Color): void;
    abstract blendFloat(source: number, target: number, weight: number): number;
}
export declare class NormalBlend extends BlendFunction {
    blendVector3(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    blendQuaternion(source: Quaternion, target: Quaternion, weight: number, result: Quaternion): void;
    blendEuler(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    blendFloat(source: number, target: number, weight: number): number;
    blendColor(source: Color, target: Color, weight: number, result: Color): void;
    private lerpEuler;
    private normalizeAngle;
    /**
     * 计算两个角度之间的最短路径差
     */
    private shortestAngleDiff;
    private lerpAngle;
}
export declare class AdditiveBlend extends BlendFunction {
    blendVector3(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    blendQuaternion(source: Quaternion, target: Quaternion, weight: number, result: Quaternion): void;
    blendEuler(source: Vector3, target: Vector3, weight: number, result: Vector3): void;
    blendFloat(source: number, target: number, weight: number): number;
    blendColor(source: Color, target: Color, weight: number, result: Color): void;
}
export declare class Blender {
    private static normalBlendFunction;
    private static additiveBlendFunction;
    static localBlend(sourcePose: Pose, targetPose: Pose, blendWeight: number, resultPose: Pose): void;
    static additiveBlend(sourcePose: Pose, targetPose: Pose, blendWeight: number, resultPose: Pose): void;
    private static localBlendInternal;
}