Add Editor-only construct to check if SPS selected

Used for Inspector window warnings

Author: robbiesri

PostProcessing/Editor/PostProcessLayerEditor.cs

@@ -117,7 +117,7 @@ public override void OnInspectorGUI()
             var camera = m_Target.GetComponent<Camera>();
 
             #if !UNITY_2017_2_OR_NEWER
-            if (RuntimeUtilities.isSinglePassStereoEnabled)
+            if (RuntimeUtilities.isSinglePassStereoSelected)
                 EditorGUILayout.HelpBox("Unity 2017.2+ required for full Single-pass stereo rendering support.", MessageType.Warning);
             #endif
 
@@ -181,9 +181,9 @@ void DoAntialiasing()
                 if (m_AntialiasingMode.intValue == (int)PostProcessLayer.Antialiasing.TemporalAntialiasing)
                 {
                     #if !UNITY_2017_3_OR_NEWER
-                    if (RuntimeUtilities.isSinglePassStereoEnabled)
+                    if (RuntimeUtilities.isSinglePassStereoSelected)
                         EditorGUILayout.HelpBox("TAA requires Unity 2017.3+ for Single-pass stereo rendering support.", MessageType.Warning);
-                    #endif 
+                    #endif
 
                     EditorGUILayout.PropertyField(m_TaaJitterSpread);
                     EditorGUILayout.PropertyField(m_TaaStationaryBlending);
@@ -192,7 +192,7 @@ void DoAntialiasing()
                 }
                 else if (m_AntialiasingMode.intValue == (int)PostProcessLayer.Antialiasing.SubpixelMorphologicalAntialiasing)
                 {
-                    if (RuntimeUtilities.isSinglePassStereoEnabled)
+                    if (RuntimeUtilities.isSinglePassStereoSelected)
                         EditorGUILayout.HelpBox("SMAA doesn't work with Single-pass stereo rendering.", MessageType.Warning);
                 }
                 else if (m_AntialiasingMode.intValue == (int)PostProcessLayer.Antialiasing.FastApproximateAntialiasing)

PostProcessing/Runtime/Utils/RuntimeUtilities.cs

@@ -227,15 +227,24 @@ public static bool scriptableRenderPipelineActive
             get { return GraphicsSettings.renderPipelineAsset != null; } // 5.6+ only
         }
 
+#if UNITY_EDITOR
+        public static bool isSinglePassStereoSelected
+        {
+            get
+            {
+                return UnityEditor.PlayerSettings.virtualRealitySupported
+                    && UnityEditor.PlayerSettings.stereoRenderingPath == UnityEditor.StereoRenderingPath.SinglePass;
+            }
+        }
+#endif
+
         // TODO: Check for SPSR support at runtime
         public static bool isSinglePassStereoEnabled
         {
             get
             {
 #if UNITY_EDITOR
-                return UnityEditor.PlayerSettings.virtualRealitySupported
-                    && UnityEditor.PlayerSettings.stereoRenderingPath == UnityEditor.StereoRenderingPath.SinglePass
-                    && Application.isPlaying;
+                return isSinglePassStereoSelected && Application.isPlaying;
 #elif UNITY_2017_2_OR_NEWER
                 return UnityEngine.XR.XRSettings.eyeTextureDesc.vrUsage == VRTextureUsage.TwoEyes;
 #else