Improve upgrade material system + Add versionning via HDRPProjectVersion.txt to project settings

com.unity.render-pipelines.core/CoreRP/Editor/CoreEditorUtils.cs

 using System;
+using System.IO;
 using System.Collections.Generic;
 using System.Linq;
 using System.Linq.Expressions;
         static public GameObject CreateGameObject(GameObject parent, string name, params Type[] types)
         {
             return ObjectFactory.CreateGameObject(GameObjectUtility.GetUniqueNameForSibling(parent != null ? parent.transform : null, name), types);
+        }
+
+        static public string GetCurrentProjectVersion()
+        {
+            string[] readText = File.ReadAllLines("ProjectSettings/ProjectVersion.txt");
+            // format is m_EditorVersion: 2018.2.0b7
+            string[] versionText = readText[0].Split(' ');
+            return versionText[1];
         }
     }
 

com.unity.render-pipelines.high-definition/HDRP/Editor/Upgraders/UpgradeMenuItem.cs

+using System;
 using System.IO;
 using UnityEngine;
 using UnityEngine.Experimental.Rendering;
 
         // Update EmissiveColor after we remove EmissiveIntensity from all shaders in 2018.2
         // Now EmissiveColor is HDR and it must be update to the value new EmissiveColor = old EmissiveColor * EmissiveIntensity
-        static bool UpdateMaterial_EmissiveColor_2018_2(string path, Material mat)
+        static bool UpdateMaterial_EmissiveColor(string path, Material mat)
         {
             // Find the missing property in the file and update EmissiveColor
             string[] readText = File.ReadAllLines(path);
             return false;
         }
 
-        static void UpdateMaterialFile_EmissiveColor_2018_2(string path)
+        static void UpdateMaterialFile_EmissiveColor(string path)
         {
             string[] readText = File.ReadAllLines(path);
 
         }
 
         [MenuItem("Edit/Render Pipeline/Update all Materials to latest version", priority = CoreUtils.editMenuPriority3)]
-        static void UpdateMaterialToNewerVersion()
+        static public void UpdateMaterialToNewerVersion()
-            UpdateMaterialToNewerVersion("(EmissiveColor)", UpdateMaterial_EmissiveColor_2018_2, UpdateMaterialFile_EmissiveColor_2018_2);
+            // Caution: All the functions here MUST be re-entrant (call multiple time) without failing.
+
+            float currentVersion = HDRPVersion.GetCurrentHDRPProjectVersion();
+            if (currentVersion < 1.0)
+            {
+                // Appear in hdrp version 1.0
+                UpdateMaterialToNewerVersion("(EmissiveColor)", UpdateMaterial_EmissiveColor, UpdateMaterialFile_EmissiveColor);
+            }
         }
     }
 }

com.unity.render-pipelines.high-definition/HDRP/Material/LayeredLit/LayeredLit.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Following set of parameters represent the parameters node inside the MaterialGraph.
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 

com.unity.render-pipelines.high-definition/HDRP/Material/LayeredLit/LayeredLitTessellation.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Following set of parameters represent the parameters node inside the MaterialGraph.
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/Lit.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Following set of parameters represent the parameters node inside the MaterialGraph.
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 

com.unity.render-pipelines.high-definition/HDRP/Material/Lit/LitTessellation.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Following set of parameters represent the parameters node inside the MaterialGraph.
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 

com.unity.render-pipelines.high-definition/HDRP/Material/StackLit/StackLit.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Following set of parameters represent the parameters node inside the MaterialGraph.
         // They are use to fill a SurfaceData. With a MaterialGraph this should not exist.
 

com.unity.render-pipelines.high-definition/HDRP/Material/Unlit/Unlit.shader

 {
     Properties
     {
+        // Versioning of material to help for upgrading
+        [HideInInspector] _HdrpVersion("_HdrpVersion", Float) = 1
+
         // Be careful, do not change the name here to _Color. It will conflict with the "fake" parameters (see end of properties) required for GI.
         _UnlitColor("Color", Color) = (1,1,1,1)
         _UnlitColorMap("ColorMap", 2D) = "white" {}

com.unity.render-pipelines.high-definition/HDRP/Editor/Upgraders/HDRPVersion.cs

+using System;
+using System.IO;
+using UnityEngine;
+using UnityEditor;
+
+namespace UnityEditor.Experimental.Rendering.HDPipeline
+{
+    [InitializeOnLoad]
+    public class HDRPVersion
+    {
+        static public float hdrpVersion = 1.0f;
+
+        static public float GetCurrentHDRPProjectVersion()
+        {
+            string[] version = new string[1];
+            version[0] = "0.9"; // Note: When we don't know what a project is, assume worst case
+
+            try
+            {
+                version = File.ReadAllLines("ProjectSettings/HDRPProjectVersion.txt");
+            }
+            catch
+            {
+                Debug.LogWarning("Unable to read from ProjectSettings/HDRPProjectVersion.txt - Assign default version value");
+            }
+
+            return float.Parse(version[0]);
+        }
+
+        static public void WriteCurrentHDRPProjectVersion()
+        {
+            string[] newVersion = new string[1];
+            newVersion[0] = hdrpVersion.ToString();
+
+            try
+            {
+                File.WriteAllLines("ProjectSettings/HDRPProjectVersion.txt", newVersion);
+            }
+            catch
+            {
+                Debug.LogWarning("Unable to write ProjectSettings/HDRPProjectVersion.txt");
+            }
+        }
+
+        static HDRPVersion()
+        {
+            // Compare project version with current version - Trigger an upgrade if user ask for it
+            if (GetCurrentHDRPProjectVersion() < hdrpVersion)
+            {
+                if (EditorUtility.DisplayDialog("A newer version of Unity has been detected",
+                                                "Do you want to upgrade your materials to newer version?\n You can also upgrade manually materials in Edit -> Render Pipeline submenu", "Yes", "No"))
+                {
+                    UpgradeMenuItems.UpdateMaterialToNewerVersion();
+                }
+            }
+
+            // Update current project version with HDRP version
+            WriteCurrentHDRPProjectVersion();
+        }
+    }
+}

com.unity.render-pipelines.high-definition/HDRP/Editor/Upgraders/HDRPVersion.cs.meta

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