From 488958ce44b2d7cff21b7edaa9ddbb0e3dd7d3da Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Tue, 18 Jul 2023 10:16:11 +0200
Subject: [PATCH] Fix `DrawSceneDepth` to properly draw scene objects when
 custom actors list is empty

#1253
---
 Source/Editor/Gizmo/SelectionOutline.cs |  2 ++
 Source/Engine/Renderer/Renderer.cs      | 20 +++++++++++++++-----
 2 files changed, 17 insertions(+), 5 deletions(-)

diff --git a/Source/Editor/Gizmo/SelectionOutline.cs b/Source/Editor/Gizmo/SelectionOutline.cs
index ccc4bdd27..1374c7247 100644
--- a/Source/Editor/Gizmo/SelectionOutline.cs
+++ b/Source/Editor/Gizmo/SelectionOutline.cs
@@ -178,6 +178,8 @@ namespace FlaxEditor.Gizmo
                 if (selection[i] is ActorNode actorNode && actorNode.Actor != null)
                     CollectActors(actorNode.Actor);
             }
+            if (_actors.Count == 0)
+                return;
 
             // Render selected objects depth
             Renderer.DrawSceneDepth(context, task, customDepth, _actors);
diff --git a/Source/Engine/Renderer/Renderer.cs b/Source/Engine/Renderer/Renderer.cs
index bfb81a84c..71dca424b 100644
--- a/Source/Engine/Renderer/Renderer.cs
+++ b/Source/Engine/Renderer/Renderer.cs
@@ -17,10 +17,13 @@ namespace FlaxEngine
         [Unmanaged]
         public static void DrawSceneDepth(GPUContext context, SceneRenderTask task, GPUTexture output, List<Actor> customActors)
         {
-            if (customActors.Count == 0)
-                return;
-            var temp = CollectionsMarshal.AsSpan(customActors).ToArray(); // FIXME
-            var tempCount = temp.Length;
+            Actor[] temp = null;
+            int tempCount = 0;
+            if (customActors != null && customActors.Count != 0)
+            {
+                temp = CollectionsMarshal.AsSpan(customActors).ToArray(); // FIXME
+                tempCount = temp.Length;
+            }
             Internal_DrawSceneDepth(FlaxEngine.Object.GetUnmanagedPtr(context), FlaxEngine.Object.GetUnmanagedPtr(task), FlaxEngine.Object.GetUnmanagedPtr(output), temp, ref tempCount);
         }
 
@@ -32,7 +35,14 @@ namespace FlaxEngine
         [Unmanaged]
         public static void DrawActors(ref RenderContext renderContext, List<Actor> customActors)
         {
-            DrawActors(ref renderContext, Utils.ExtractArrayFromList(customActors));
+            Actor[] temp = null;
+            int tempCount = 0;
+            if (customActors != null && customActors.Count != 0)
+            {
+                temp = CollectionsMarshal.AsSpan(customActors).ToArray(); // FIXME
+                tempCount = temp.Length;
+            }
+            Internal_DrawActors(ref renderContext, temp, ref tempCount);
         }
     }
 }