Add base loader checkers

Author: keveleigh

Assets/MRTK/Providers/XRSDK/MRTK.XRSDK.asmdef

@@ -2,6 +2,7 @@
     "name": "Microsoft.MixedReality.Toolkit.Providers.XRSDK",
     "references": [
         "Microsoft.MixedReality.Toolkit",
+        "Unity.XR.Management",
         "UnityEngine.SpatialTracking"
     ],
     "includePlatforms": [],
@@ -18,6 +19,11 @@
             "name": "com.unity.xr.legacyinputhelpers",
             "expression": "",
             "define": "SPATIALTRACKING_ENABLED"
+        },
+        {
+            "name": "com.unity.xr.management",
+            "expression": "",
+            "define": "XR_MANAGEMENT_ENABLED"
         }
     ],
     "noEngineReferences": false

Assets/MRTK/Providers/XRSDK/XRSDKDeviceManager.cs

@@ -9,6 +9,10 @@
 using UnityEngine;
 using UnityEngine.XR;
 
+#if XR_MANAGEMENT_ENABLED
+using UnityEngine.XR.Management;
+#endif // XR_MANAGEMENT_ENABLED
+
 namespace Microsoft.MixedReality.Toolkit.XRSDK.Input
 {
     /// <summary>
@@ -52,6 +56,22 @@ public virtual bool CheckCapability(MixedRealityCapability capability)
             InputDeviceCharacteristics.HandTracking
         };
 
+#if XR_MANAGEMENT_ENABLED
+        /// <summary>
+        /// Checks if the active loader has a specific name. Used in cases where the loader class is internal, like WindowsMRLoader.
+        /// </summary>
+        /// <param name="loaderName">The string name to compare against the active loader.</param>
+        /// <returns>True if the active loader has the same name as the parameter.</returns>
+        protected virtual bool IsLoaderActive(string loaderName) => XRGeneralSettings.Instance.Manager.activeLoader.name == loaderName;
+
+        /// <summary>
+        /// Checks if the active loader is of a specific type. Used in cases where the loader class is accessible, like OculusLoader.
+        /// </summary>
+        /// <typeparam name="T">The loader class type to check against the active loader.</typeparam>
+        /// <returns>True if the active loader is of the specified type.</returns>
+        protected virtual bool IsLoaderActive<T>() where T : XRLoader => XRGeneralSettings.Instance.Manager.activeLoader is T;
+#endif // XR_MANAGEMENT_ENABLED
+
         private static readonly ProfilerMarker UpdatePerfMarker = new ProfilerMarker("[MRTK] XRSDKDeviceManager.Update");
 
         /// <inheritdoc/>