From 8017660ecafdc061c8dc301925b839dadf66f1c3 Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Sun, 4 Oct 2026 14:20:30 +0200
Subject: [PATCH] Add `ConstantInvalidate` option to `RenderToTextureControl`
 for no-cached image

---
 .../UI/GUI/Common/RenderToTextureControl.cs   | 42 ++++++++++++++++---
 1 file changed, 36 insertions(+), 6 deletions(-)

diff --git a/Source/Engine/UI/GUI/Common/RenderToTextureControl.cs b/Source/Engine/UI/GUI/Common/RenderToTextureControl.cs
index f1a9c69a5..abaf69e21 100644
--- a/Source/Engine/UI/GUI/Common/RenderToTextureControl.cs
+++ b/Source/Engine/UI/GUI/Common/RenderToTextureControl.cs
@@ -9,7 +9,7 @@ namespace FlaxEngine.GUI
     public class RenderToTextureControl : ContainerControl
     {
         private bool _invalid, _redrawRegistered, _isDuringTextureDraw;
-        private bool _autoSize = true;
+        private bool _autoSize = true, _constantInvalidate = false;
         private GPUTexture _texture;
         private Float2 _textureSize;
         private MaterialBase _drawMaterial;
@@ -60,6 +60,33 @@ namespace FlaxEngine.GUI
         [EditorOrder(30)]
         public bool AutomaticInvalidate { get; set; } = true;
 
+        /// <summary>
+        /// Gets or sets the value whether cached texture data should be invalidated every frame (eg. when UI is animated). 
+        /// </summary>
+        [EditorOrder(40)]
+        public bool ConstantInvalidate
+        {
+            get => _constantInvalidate;
+            set
+            {
+                if (_constantInvalidate != value)
+                {
+                    _constantInvalidate = value;
+                    if (value)
+                    {
+                        // Register for constant invalidation
+                        Invalidate();
+                    }
+                    else if (_invalid && _redrawRegistered)
+                    {
+                        // Don't invalidate anymore
+                        _redrawRegistered = false;
+                        Scripting.Draw -= OnDraw;
+                    }
+                }
+            }
+        }
+
         /// <summary>
         /// Gets or sets the GUI material used to draw the cached texture to the screen.
         /// Can be used to post-process underlying GUI with a custom shader (eg. chromatic-aberration, blur or tint). If not set, simple texture copy is performed.
@@ -116,13 +143,16 @@ namespace FlaxEngine.GUI
 
         private void OnDraw()
         {
-            if (_redrawRegistered)
+            if (!ConstantInvalidate)
             {
-                _redrawRegistered = false;
-                Scripting.Draw -= OnDraw;
+                if (_redrawRegistered)
+                {
+                    _redrawRegistered = false;
+                    Scripting.Draw -= OnDraw;
+                }
+                if (!_invalid)
+                    return;
             }
-            if (!_invalid)
-                return;
             _invalid = false;
 
             if (!_texture)