SteamVR_Stats.cs

//======= Copyright (c) Valve Corporation, All rights reserved. ===============
//
// Purpose: Helper to display various hmd stats via GUIText
//
//=============================================================================

using UnityEngine;

#if UNITY_2017_2_OR_NEWER

[ExecuteInEditMode]
public class SteamVR_Stats : MonoBehaviour
{
    void Awake()
    {
        Debug.Log("SteamVR_Stats is deprecated in Unity 2017.2 - REMOVING");
        DestroyImmediate(this);
    }
}

#else

using Valve.VR;

public class SteamVR_Stats : MonoBehaviour
{
    public GUIText text;

    public Color fadeColor = Color.black;
    public float fadeDuration = 1.0f;

    void Awake()
    {
        if (text == null)
        {
            text = GetComponent<GUIText>();
            text.enabled = false;
        }

        if (fadeDuration > 0)
        {
            SteamVR_Fade.Start(fadeColor, 0);
            SteamVR_Fade.Start(Color.clear, fadeDuration);
        }
    }

    double lastUpdate = 0.0f;

    void Update()
    {
        if (text != null)
        {
            if (Input.GetKeyDown(KeyCode.I))
            {
                text.enabled = !text.enabled;
            }

            if (text.enabled)
            {
                var compositor = OpenVR.Compositor;
                if (compositor != null)
                {
                    var timing = new Compositor_FrameTiming();
                    timing.m_nSize = (uint)System.Runtime.InteropServices.Marshal.SizeOf(typeof(Compositor_FrameTiming));
                    compositor.GetFrameTiming(ref timing, 0);

                    var update = timing.m_flSystemTimeInSeconds;
                    if (update > lastUpdate)
                    {
                        var framerate = (lastUpdate > 0.0f) ? 1.0f / (update - lastUpdate) : 0.0f;
                        lastUpdate = update;
                        text.text = string.Format("framerate: {0:N0}\ndropped frames: {1}", framerate, (int)timing.m_nNumDroppedFrames);
                    }
                    else
                    {
                        lastUpdate = update;
                    }
                }
            }
        }
    }
}

#endif