version 2.5.0

com.htc.upm.vive.openxr/Runtime/Features/DisplayRefreshRate/Scripts/ViveDisplayRefreshRateHelper.cs

@@ -0,0 +1,111 @@
+// Copyright HTC Corporation All Rights Reserved.
+
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using UnityEngine;
+
+namespace VIVE.OpenXR.DisplayRefreshRate
+{
+	// -------------------- 12.52. XR_FB_display_refresh_rate --------------------
+	#region New Structures
+	/// <summary>
+	/// On platforms which support dynamically adjusting the display refresh rate, application developers may request a specific display refresh rate in order to improve the overall user experience.
+	/// </summary>
+	[StructLayout(LayoutKind.Sequential)]
+	public struct XrEventDataDisplayRefreshRateChangedFB
+	{
+		/// <summary>
+		/// The <see cref="XrStructureType"/> of this structure.
+		/// </summary>
+		public XrStructureType type;
+		/// <summary>
+		/// NULL or a pointer to the next structure in a structure chain. No such structures are defined in core OpenXR or this extension.
+		/// </summary>
+		public IntPtr next;
+		/// <summary>
+		/// fromDisplayRefreshRate is the previous display refresh rate.
+		/// </summary>
+		public float fromDisplayRefreshRate;
+		/// <summary>
+		/// toDisplayRefreshRate is the new display refresh rate.
+		/// </summary>
+		public float toDisplayRefreshRate;
+
+		/// <summary>
+		/// The XR_FB_display_refresh_rate extension must be enabled prior to using XrEventDataDisplayRefreshRateChangedFB.
+		/// </summary>
+		public XrEventDataDisplayRefreshRateChangedFB(XrStructureType in_type, IntPtr in_next, float in_fromDisplayRefreshRate, float in_toDisplayRefreshRate)
+		{
+			type = in_type;
+			next = in_next;
+			fromDisplayRefreshRate = in_fromDisplayRefreshRate;
+			toDisplayRefreshRate = in_toDisplayRefreshRate;
+		}
+		/// <summary>
+		/// Retrieves the identity value of XrEventDataDisplayRefreshRateChangedFB.
+		/// </summary>
+		public static XrEventDataDisplayRefreshRateChangedFB identity
+		{
+			get
+			{
+				return new XrEventDataDisplayRefreshRateChangedFB(XrStructureType.XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB, IntPtr.Zero, 0.0f, 0.0f); // user is default present
+			}
+		}
+		public static bool Get(XrEventDataBuffer eventDataBuffer, out XrEventDataDisplayRefreshRateChangedFB eventDataDisplayRefreshRateChangedFB)
+		{
+			eventDataDisplayRefreshRateChangedFB = identity;
+
+			if (eventDataBuffer.type == XrStructureType.XR_TYPE_EVENT_DATA_DISPLAY_REFRESH_RATE_CHANGED_FB)
+			{
+				eventDataDisplayRefreshRateChangedFB.next = eventDataBuffer.next;
+				eventDataDisplayRefreshRateChangedFB.fromDisplayRefreshRate = BitConverter.ToSingle(eventDataBuffer.varying, 0);
+				eventDataDisplayRefreshRateChangedFB.toDisplayRefreshRate = BitConverter.ToSingle(eventDataBuffer.varying, 4);
+				return true;
+			}
+
+			return false;
+		}
+	}
+
+	public static class ViveDisplayRefreshRateChanged
+	{
+		public delegate void OnDisplayRefreshRateChanged(float fromDisplayRefreshRate, float toDisplayRefreshRate);
+
+		public static void Listen(OnDisplayRefreshRateChanged callback)
+		{
+			if (!allEventListeners.Contains(callback))
+				allEventListeners.Add(callback);
+		}
+		public static void Remove(OnDisplayRefreshRateChanged callback)
+		{
+			if (allEventListeners.Contains(callback))
+				allEventListeners.Remove(callback);
+		}
+		public static void Send(float fromDisplayRefreshRate, float toDisplayRefreshRate)
+		{
+			int N = 0;
+			if (allEventListeners != null)
+			{
+				N = allEventListeners.Count;
+				for (int i = N - 1; i >= 0; i--)
+				{
+					OnDisplayRefreshRateChanged single = allEventListeners[i];
+					try
+					{
+						single(fromDisplayRefreshRate, toDisplayRefreshRate);
+					}
+					catch (Exception e)
+					{
+						Debug.Log("Event : " + e.ToString());
+						allEventListeners.Remove(single);
+						Debug.Log("Event : A listener is removed due to exception.");
+					}
+				}
+			}
+		}
+
+		private static List<OnDisplayRefreshRateChanged> allEventListeners = new List<OnDisplayRefreshRateChanged>();
+	}
+	#endregion
+}