Add XR sample assets and update settings

Assets/Samples/XR Plugin Management/4.5.3/Example XR Management implementation/SampleLoader.cs

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+using System.Collections.Generic;
+
+using UnityEngine.XR;
+using UnityEngine.XR.Management;
+
+#if UNITY_EDITOR
+using UnityEditor;
+using UnityEditor.XR.Management;
+#endif
+
+namespace Samples
+{
+    /// <summary>
+    /// Sample loader implentation showing how to create simple loader.
+    /// NOTE: You have to rename this class to make it appear in the loader list for
+    /// XRManager.
+    /// </summary>
+#if UNITY_EDITOR
+    [XRSupportedBuildTarget(BuildTargetGroup.Standalone, new BuildTarget[]{ BuildTarget.StandaloneWindows, BuildTarget.StandaloneWindows64})]
+    [XRSupportedBuildTarget(BuildTargetGroup.Android)]
+#endif
+    public class SampleLoader : XRLoaderHelper
+    {
+        static List<XRInputSubsystemDescriptor> s_InputSubsystemDescriptors =
+            new List<XRInputSubsystemDescriptor>();
+
+        /// <summary>Return the currently active Input Subsystem intance, if any.</summary>
+        public XRInputSubsystem inputSubsystem
+        {
+            get { return GetLoadedSubsystem<XRInputSubsystem>(); }
+        }
+
+        SampleSettings GetSettings()
+        {
+            SampleSettings settings = null;
+            // When running in the Unity Editor, we have to load user's customization of configuration data directly from
+            // EditorBuildSettings. At runtime, we need to grab it from the static instance field instead.
+#if UNITY_EDITOR
+            UnityEditor.EditorBuildSettings.TryGetConfigObject(SampleConstants.k_SettingsKey, out settings);
+#else
+            settings = SampleSettings.s_RuntimeInstance;
+#endif
+            return settings;
+        }
+
+#region XRLoader API Implementation
+
+        /// <summary>Implementaion of <see cref="XRLoader.Initialize"/></summary>
+        /// <returns>True if successful, false otherwise</returns>
+        public override bool Initialize()
+        {
+            SampleSettings settings = GetSettings();
+            if (settings != null)
+            {
+                // TODO: Pass settings off to plugin prior to subsystem init.
+            }
+
+            CreateSubsystem<XRInputSubsystemDescriptor, XRInputSubsystem>(s_InputSubsystemDescriptors, "InputSubsystemDescriptor");
+
+            return false;
+        }
+
+        /// <summary>Implementaion of <see cref="XRLoader.Start"/></summary>
+        /// <returns>True if successful, false otherwise</returns>
+        public override bool Start()
+        {
+            StartSubsystem<XRInputSubsystem>();
+            return true;
+        }
+
+        /// <summary>Implementaion of <see cref="XRLoader.Stop"/></summary>
+        /// <returns>True if successful, false otherwise</returns>
+        public override bool Stop()
+        {
+            StopSubsystem<XRInputSubsystem>();
+            return true;
+        }
+
+        /// <summary>Implementaion of <see cref="XRLoader.Deinitialize"/></summary>
+        /// <returns>True if successful, false otherwise</returns>
+        public override bool Deinitialize()
+        {
+            DestroySubsystem<XRInputSubsystem>();
+            return base.Deinitialize();
+        }
+
+#endregion
+    }
+}