Don't return matrix by value due to perf #4136

Source/Editor/Gizmo/GridGizmo.cs

@@ -113,7 +113,7 @@ namespace FlaxEditor.Gizmo
                 if (cb != IntPtr.Zero)
                 {
                     var data = new Data();
-                    var projection = renderContext.View.GetOverlayProjection();
+                    renderContext.View.GetOverlayProjection(out var projection);
                     Matrix.Multiply(ref renderContext.View.View, ref projection, out var viewProjection);
                     Matrix.Transpose(ref viewProjection, out data.ViewProjectionMatrix);
                     data.ViewPos = renderContext.View.WorldPosition;

Source/Engine/Graphics/RenderView.cs

@@ -36,9 +36,10 @@ namespace FlaxEngine
         /// <summary>
         /// Gets projection matrix for overlay geometry rendered after temporal anti-aliasing has been resolved.
         /// </summary>
-        public Matrix GetOverlayProjection()
+        /// <param name="projection">Projection matrix valid for rendering before or after (matches current TAA jitter stage).</param>
+        public void GetOverlayProjection(out Matrix projection)
         {
-            return IsTaaResolved ? NonJitteredProjection : Projection;
+            projection = IsTaaResolved ? NonJitteredProjection : Projection;
         }
 
         /// <summary>

Source/Engine/UI/UICanvas.cs

@@ -90,7 +90,7 @@ namespace FlaxEngine
             Matrix.Multiply(ref worldMatrix, ref renderContext.View.View, out Matrix viewMatrix);
             Matrix projectionMatrix = renderContext.View.Projection;
             if (worldSpace && (Canvas.RenderLocation == PostProcessEffectLocation.Default || Canvas.RenderLocation == PostProcessEffectLocation.AfterAntiAliasingPass))
-                projectionMatrix = renderContext.View.GetOverlayProjection(); // Fix TAA jittering when rendering UI in world after TAA resolve
+                renderContext.View.GetOverlayProjection(out projectionMatrix); // Fix TAA jittering when rendering UI in world after TAA resolve
             Matrix.Multiply(ref viewMatrix, ref projectionMatrix, out Matrix viewProjectionMatrix);
 
             // Pick a depth buffer