Fail more gracefully on platforms without compute shaders.

Assets/VolumetricFog/Editor/VolumetricFogEditor.cs

@@ -0,0 +1,17 @@
+using UnityEditor;
+
+[CustomEditor(typeof(VolumetricFog))]
+[CanEditMultipleObjects]
+public class VolumetricFogEditor : Editor
+{
+	override public void OnInspectorGUI()
+	{
+		if (!VolumetricFog.CheckSupport())
+		{
+			EditorGUILayout.HelpBox(VolumetricFog.GetUnsupportedErrorMessage(), MessageType.Error);
+			return;
+		}
+
+		DrawDefaultInspector();
+	}
+}

Assets/VolumetricFog/Editor/VolumetricFogEditor.cs.meta

@@ -0,0 +1,12 @@
+fileFormatVersion: 2
+guid: 9dc42dc79f60fe8449ca035a77f732ae
+timeCreated: 1507493299
+licenseType: Pro
+MonoImporter:
+  serializedVersion: 2
+  defaultReferences: []
+  executionOrder: 0
+  icon: {instanceID: 0}
+  userData: 
+  assetBundleName: 
+  assetBundleVariant: 

Assets/VolumetricFog/Scripts/VolumetricFog.cs

@@ -520,6 +520,14 @@ public class VolumetricFog : MonoBehaviour
 	[ImageEffectOpaque]
 	void OnRenderImage(RenderTexture src, RenderTexture dest)
 	{
+		if (!CheckSupport())
+		{
+			Debug.LogError(GetUnsupportedErrorMessage());
+			Graphics.Blit(src, dest);
+			enabled = false;
+			return;
+		}
+
 		if(m_Debug)
 		{
 			DebugDisplay(src, dest);
@@ -684,4 +692,15 @@ public class VolumetricFog : MonoBehaviour
 		Gizmos.matrix = transform.localToWorldMatrix;
 		Gizmos.DrawFrustum(Vector3.zero, cam.fieldOfView, farClip, nearClip, cam.aspect);
 	}
+
+	public static bool CheckSupport()
+	{
+		return SystemInfo.supportsComputeShaders;
+	}
+
+	public static string GetUnsupportedErrorMessage()
+	{
+		return "Volumetric Fog requires compute shaders and this platform doesn't support them. Disabling. \nDetected device type: " + 
+			SystemInfo.graphicsDeviceType + ", version: " + SystemInfo.graphicsDeviceVersion;
+	}
 }

ProjectSettings/ProjectVersion.txt

@@ -1 +1 @@
-m_EditorVersion: 5.6.0f3
+m_EditorVersion: 2017.1.2f1