From d82679ae5daba6ce6775463d4bbfd9f8c119ea25 Mon Sep 17 00:00:00 2001
From: Robert Cupisz <robertcupisz@gmail.com>
Date: Sun, 8 Oct 2017 22:53:04 +0200
Subject: [PATCH] Fail more gracefully on platforms without compute shaders.

---
 .../Editor/VolumetricFogEditor.cs             | 17 +++++++++++++++++
 .../Editor/VolumetricFogEditor.cs.meta        | 12 ++++++++++++
 Assets/VolumetricFog/Scripts/VolumetricFog.cs | 19 +++++++++++++++++++
 ProjectSettings/ProjectVersion.txt            |  2 +-
 4 files changed, 49 insertions(+), 1 deletion(-)
 create mode 100644 Assets/VolumetricFog/Editor/VolumetricFogEditor.cs
 create mode 100644 Assets/VolumetricFog/Editor/VolumetricFogEditor.cs.meta

diff --git a/Assets/VolumetricFog/Editor/VolumetricFogEditor.cs b/Assets/VolumetricFog/Editor/VolumetricFogEditor.cs
new file mode 100644
index 0000000..de91dfc
--- /dev/null
+++ b/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();
+	}
+}
diff --git a/Assets/VolumetricFog/Editor/VolumetricFogEditor.cs.meta b/Assets/VolumetricFog/Editor/VolumetricFogEditor.cs.meta
new file mode 100644
index 0000000..756c73a
--- /dev/null
+++ b/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: 
diff --git a/Assets/VolumetricFog/Scripts/VolumetricFog.cs b/Assets/VolumetricFog/Scripts/VolumetricFog.cs
index ad5c05b..7f2e584 100644
--- a/Assets/VolumetricFog/Scripts/VolumetricFog.cs
+++ b/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;
+	}
 }
diff --git a/ProjectSettings/ProjectVersion.txt b/ProjectSettings/ProjectVersion.txt
index ca09a3d..4b80f92 100644
--- a/ProjectSettings/ProjectVersion.txt
+++ b/ProjectSettings/ProjectVersion.txt
@@ -1 +1 @@
-m_EditorVersion: 5.6.0f3
+m_EditorVersion: 2017.1.2f1