From 8ba21166bedcda491dc137b1cb9cfe1885d873e0 Mon Sep 17 00:00:00 2001
From: dnesov <contact.dnesov@gmail.com>
Date: Tue, 2 Jun 2026 00:59:29 +0200
Subject: [PATCH] Expose scissor mode, use it in UI

---
 Voile/Source/Rendering/RaylibRenderSystem.cs   |  7 +++++++
 Voile/Source/Rendering/RenderSystem.cs         |  3 +++
 Voile/Source/Rendering/StandardRenderSystem.cs | 10 ++++++++++
 Voile/Source/UI/Containers/Container.cs        |  4 ++++
 Voile/Source/UI/UIElement.cs                   |  2 ++
 5 files changed, 26 insertions(+)

diff --git a/Voile/Source/Rendering/RaylibRenderSystem.cs b/Voile/Source/Rendering/RaylibRenderSystem.cs
index bad8981..068e5cf 100644
--- a/Voile/Source/Rendering/RaylibRenderSystem.cs
+++ b/Voile/Source/Rendering/RaylibRenderSystem.cs
@@ -139,6 +139,13 @@ namespace Voile.Rendering
             Raylib.EndBlendMode();
         }
 
+        public override void BeginScissored(Vector2 position, Rect rect)
+        {
+            Raylib.BeginScissorMode((int)position.X, (int)position.Y, (int)rect.Width, (int)rect.Height);
+        }
+
+        public override void EndScissored() => Raylib.EndScissorMode();
+
         public override void BeginCamera2d(Vector2 offset, Vector2 target, float rotation, float zoom)
         {
             var camera = new Camera2D(offset, target, rotation, zoom);
diff --git a/Voile/Source/Rendering/RenderSystem.cs b/Voile/Source/Rendering/RenderSystem.cs
index 58f330f..8da1b64 100644
--- a/Voile/Source/Rendering/RenderSystem.cs
+++ b/Voile/Source/Rendering/RenderSystem.cs
@@ -125,6 +125,9 @@ namespace Voile.Rendering
         public abstract void BeginBlended(BlendMode blendMode);
         public abstract void EndBlended();
 
+        public abstract void BeginScissored(Vector2 position, Rect rect);
+        public abstract void EndScissored();
+
         /// <summary>
         /// Begins drawing using a 2D camera.
         /// </summary>
diff --git a/Voile/Source/Rendering/StandardRenderSystem.cs b/Voile/Source/Rendering/StandardRenderSystem.cs
index 7bede5c..86d016b 100644
--- a/Voile/Source/Rendering/StandardRenderSystem.cs
+++ b/Voile/Source/Rendering/StandardRenderSystem.cs
@@ -404,6 +404,16 @@ namespace Voile.Rendering
             throw new NotImplementedException();
         }
 
+        public override void BeginScissored(Vector2 position, Rect rect)
+        {
+            throw new NotImplementedException();
+        }
+
+        public override void EndScissored()
+        {
+            throw new NotImplementedException();
+        }
+
         private Vector2 _windowSize = Vector2.Zero;
         private IWindow? _window;
 
diff --git a/Voile/Source/UI/Containers/Container.cs b/Voile/Source/UI/Containers/Container.cs
index 54f7d10..cd1b3e6 100644
--- a/Voile/Source/UI/Containers/Container.cs
+++ b/Voile/Source/UI/Containers/Container.cs
@@ -161,6 +161,8 @@ public abstract class Container : UIElement, IParentableElement
 
     protected override void OnRender(RenderSystem renderer, Style style)
     {
+        renderer.BeginScissored(GlobalPosition, LayoutSize);
+
         foreach (var child in Children)
         {
             if (child is not IRenderableElement renderable) continue;
@@ -172,6 +174,8 @@ public abstract class Container : UIElement, IParentableElement
 
             renderable.Render(renderer, childStyle);
         }
+
+        renderer.EndScissored();
     }
 
     private List<UIElement> _children = new();
diff --git a/Voile/Source/UI/UIElement.cs b/Voile/Source/UI/UIElement.cs
index 29b789c..8a43901 100644
--- a/Voile/Source/UI/UIElement.cs
+++ b/Voile/Source/UI/UIElement.cs
@@ -109,7 +109,9 @@ public abstract class UIElement : IElement, IRenderableElement, IResizeableEleme
     public void Render(RenderSystem renderer, Style style)
     {
         RenderStyleBox(renderer, style);
+        renderer.BeginScissored(GlobalPosition, LayoutSize);
         OnRender(renderer, style);
+        renderer.EndScissored();
     }
 
     public void DrawSize(RenderSystem renderer)