Unity3D 计算FPS

using UnityEngine;
using System.Collections;

public class FPS : MonoBehaviour {

private const string DISPLAY_TEXT_FORMAT = "{0} msf\n({1} FPS)";
private const string MSF_FORMAT = "#.#";
private const float MS_PER_SEC = 1000f;

private string textField;
private float fps = 60;

void Awake()
{
}

void Start()
{

}

void LateUpdate()
{
float interp = Time.deltaTime / (0.5f + Time.deltaTime);
float currentFPS = 1.0f / Time.deltaTime;
fps = Mathf.Lerp(fps, currentFPS, interp);
float msf = MS_PER_SEC / fps;
textField = string.Format(DISPLAY_TEXT_FORMAT,
msf.ToString(MSF_FORMAT), Mathf.RoundToInt(fps));
}
GUIStyle style = new GUIStyle();
void OnGUI()
{
style.fontSize = 30;
style.normal.textColor = Color.white;
GUI.Label(new Rect(0, 0, 200, 100), textField, style);
}
}