DebugPanelFPSCounter.cs

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// Copyright (c) Microsoft Corporation. All rights reserved.
// Licensed under the MIT License. See LICENSE in the project root for license information.

using UnityEngine;

namespace HoloToolkit.Unity
{
    public class DebugPanelFPSCounter : MonoBehaviour
    {
        private int frameCount;
        private int framesPerSecond;
        private int lastWholeTime;

        private void Start()
        {
            if (DebugPanel.Instance != null)
            {
                DebugPanel.Instance.RegisterExternalLogCallback(GetFps);
            }
        }

        private string GetFps()
        {
            // calculate the fps first 
            // (Note that we might want to do this in our update loop)
            UpdateFps();
            return string.Format("FPS: {0}\n", framesPerSecond);
        }

        private void UpdateFps()
        {
            frameCount++;
            int currentWholeTime = (int) Time.realtimeSinceStartup;
            if (currentWholeTime != lastWholeTime)
            {
                lastWholeTime = currentWholeTime;
                framesPerSecond = frameCount;
                frameCount = 0;
            }
        }
    }
}