Implement utility to check for used render pipeline (#766)

* Implement utility to check for used render pipeline

* Fix docs

Runtime/Definitions/Utilities/RenderPipeline.cs

@@ -0,0 +1,29 @@
+// Copyright (c) XRTK. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+namespace XRTK.Definitions.Utilities
+{
+    /// <summary>
+    /// Available render pipelines for use in Unity applications.
+    /// </summary>
+    public enum RenderPipeline
+    {
+        /// <summary>
+        /// The legacy "built-in" render pipeline of Unity that was deprecated
+        /// when scriptable render pipelines were introduced.
+        /// </summary>
+        Legacy = 0,
+        /// <summary>
+        /// The universal render pipeline, formerly also known as lightweight render pipeline.
+        /// </summary>
+        UniversalRenderPipeline,
+        /// <summary>
+        /// The high definition pipeline.
+        /// </summary>
+        HighDefinitionRenderPipeline,
+        /// <summary>
+        /// A customized scriptable render pipeline.
+        /// </summary>
+        Custom
+    }
+}

Runtime/Utilities/RenderPipelineUtilities.cs

@@ -0,0 +1,38 @@
+// Copyright (c) XRTK. All rights reserved.
+// Licensed under the MIT License. See LICENSE in the project root for license information.
+
+using UnityEngine.Rendering;
+using XRTK.Extensions;
+using RenderPipeline = XRTK.Definitions.Utilities.RenderPipeline;
+
+namespace XRTK.Utilities
+{
+    public static class RenderPipelineUtilities
+    {
+        private const string urpAssetTypeName = "UniversalRenderPipelineAsset";
+        private const string hdrpAssetTypeName = "HDRenderPipelineAsset";
+
+        /// <summary>
+        /// Gets the <see cref="RenderPipeline"/> used by the project.
+        /// </summary>
+        /// <returns>The <see cref="RenderPipeline"/> used by the project.</returns>
+        public static RenderPipeline GetActiveRenderingPipeline()
+        {
+            var renderPipelineAsset = GraphicsSettings.renderPipelineAsset;
+            if (renderPipelineAsset.IsNull())
+            {
+                return RenderPipeline.Legacy;
+            }
+
+            switch (renderPipelineAsset.GetType().Name)
+            {
+                case urpAssetTypeName:
+                    return RenderPipeline.UniversalRenderPipeline;
+                case hdrpAssetTypeName:
+                    return RenderPipeline.HighDefinitionRenderPipeline;
+            }
+
+            return RenderPipeline.Custom;
+        }
+    }
+}