Updated Build window with scripting backend options and warns users before building project without scenes

Author: Stephen Hodgson

Assets/HoloToolkit/BuildAndDeploy/Editor/BuildDeployTools.cs

@@ -42,11 +42,32 @@ public static bool IsIl2CppAvailable()
             return Directory.Exists(EditorApplication.applicationContentsPath + "\\PlaybackEngines\\MetroSupport\\Managed\\il2cpp");
         }
 
+        /// <summary>
+        /// Displays a dialog if no scenes are present in the build and returns true if build can proceed.
+        /// </summary>
+        /// <returns></returns>
+        public static bool CheckBuildScenes()
+        {
+            if (EditorBuildSettings.scenes.Length == 0)
+            {
+                return EditorUtility.DisplayDialog("Attention!",
+                    "No scenes are present in the build settings!\n\n Do you want to cancel and add one?",
+                    "Continue Anyway", "Cancel Build");
+            }
+
+            return true;
+        }
+
         public static bool BuildSLN(string buildDirectory, bool showDialog = true)
         {
             // Use BuildSLNUtilities to create the SLN
             bool buildSuccess = false;
 
+            if (CheckBuildScenes() == false)
+            {
+                return false;
+            }
+
             var buildInfo = new BuildInfo
             {
                 // These properties should all match what the Standalone.proj file specifies

Assets/HoloToolkit/BuildAndDeploy/Editor/BuildDeployWindow.cs

@@ -327,6 +327,18 @@ private void OnGUI()
 
             currentSDKVersionIndex = EditorGUILayout.Popup(GUIHorizontalSpacer + "SDK Version", currentSDKVersionIndex, windowsSdkPaths);
 
+            var curScriptingBackend = PlayerSettings.GetScriptingBackend(BuildTargetGroup.WSA);
+            var newScriptingBackend = (ScriptingImplementation)EditorGUILayout.IntPopup(
+                "Scripting Backend",
+                (int)curScriptingBackend,
+                new[] { "IL2CPP", ".NET" },
+                new[] { (int)ScriptingImplementation.IL2CPP, (int)ScriptingImplementation.WinRTDotNET });
+
+            if (newScriptingBackend != curScriptingBackend)
+            {
+                PlayerSettings.SetScriptingBackend(BuildTargetGroup.WSA, newScriptingBackend);
+            }
+
             string newSDKVersion = windowsSdkPaths[currentSDKVersionIndex];
 
             if (!newSDKVersion.Equals(currentSDKVersion))
@@ -335,7 +347,6 @@ private void OnGUI()
             }
 
             string newMSBuildVer = currentSDKVersionIndex <= defaultMSBuildVersionIndex ? BuildDeployTools.DefaultMSBuildVersion : "15.0";
-            EditorGUILayout.LabelField(GUIHorizontalSpacer + "MS Build Version", newMSBuildVer);
 
             if (!newMSBuildVer.Equals(curMSBuildVer))
             {