import { StackPanel } from '../runtime';
import { App } from '../core/App';
/**
 * 性能面板
 */
export declare class PerformancePanel extends StackPanel {
    private _meshesLength;
    private _activeMeshesLength;
    private _materialsLength;
    private _texturesLength;
    private _animationLength;
    private _drawCalls;
    private _frameTimeMax;
    private _evalTimeMax;
    private _particlesFrameTime;
    private _interFrameTime;
    private _gpuFrameTime;
    private _shaderCompTime;
    private _shaderTotal;
    private _sceneRenderTime;
    private _cameraRenderTime;
    private _targetsRenderTime;
    private _fpsValue;
    private _heapSize;
    private _heapTotal;
    private _heapLimit;
    private _deltaTimeValue;
    private _sceneInstrumentation;
    private _engineInstrumentation;
    app: App;
    /**
     * 实例化一个性能面板对象
     */
    constructor(app: App);
    /**
     * 获取或设置可见性
     */
    get visible(): boolean;
    set visible(value: boolean);
    private _update;
}