From 62cca0682cc0990f1ad44e1c417eed58f8a2cedf Mon Sep 17 00:00:00 2001
From: Wojtek Figat <wojtek@figat.pl>
Date: Wed, 19 May 2021 19:48:39 +0200
Subject: [PATCH] Add option to use Point sampling when drawing textures and
 sprites in UI via Brushes

---
 .../Engine/UI/GUI/Brushes/GPUTextureBrush.cs   | 11 ++++++++++-
 Source/Engine/UI/GUI/Brushes/IBrush.cs         | 18 ++++++++++++++++++
 Source/Engine/UI/GUI/Brushes/SpriteBrush.cs    | 13 +++++++++++--
 Source/Engine/UI/GUI/Brushes/TextureBrush.cs   | 15 +++++++++++++--
 4 files changed, 52 insertions(+), 5 deletions(-)

diff --git a/Source/Engine/UI/GUI/Brushes/GPUTextureBrush.cs b/Source/Engine/UI/GUI/Brushes/GPUTextureBrush.cs
index f91e3dfe3..77ad80758 100644
--- a/Source/Engine/UI/GUI/Brushes/GPUTextureBrush.cs
+++ b/Source/Engine/UI/GUI/Brushes/GPUTextureBrush.cs
@@ -14,6 +14,12 @@ namespace FlaxEngine.GUI
         [HideInEditor]
         public GPUTexture Texture;
 
+        /// <summary>
+        /// The texture sampling filter mode.
+        /// </summary>
+        [ExpandGroups, Tooltip("The texture sampling filter mode.")]
+        public BrushFilter Filter = BrushFilter.Linear;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="GPUTextureBrush"/> class.
         /// </summary>
@@ -36,7 +42,10 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         public void Draw(Rectangle rect, Color color)
         {
-            Render2D.DrawTexture(Texture, rect, color);
+            if (Filter == BrushFilter.Point)
+                Render2D.DrawTexturePoint(Texture, rect, color);
+            else
+                Render2D.DrawTexture(Texture, rect, color);
         }
     }
 }
diff --git a/Source/Engine/UI/GUI/Brushes/IBrush.cs b/Source/Engine/UI/GUI/Brushes/IBrush.cs
index ec5ba420a..5e4df2694 100644
--- a/Source/Engine/UI/GUI/Brushes/IBrush.cs
+++ b/Source/Engine/UI/GUI/Brushes/IBrush.cs
@@ -2,6 +2,24 @@
 
 namespace FlaxEngine.GUI
 {
+    /// <summary>
+    /// Texture brush sampling modes.
+    /// </summary>
+    public enum BrushFilter
+    {
+        /// <summary>
+        /// The point sampling without blending.
+        /// </summary>
+        [Tooltip("The point sampling without blending.")]
+        Point = 0,
+
+        /// <summary>
+        /// The linear color sampling.
+        /// </summary>
+        [Tooltip("The linear color sampling.")]
+        Linear = 1,
+    };
+
     /// <summary>
     /// Interface that unifies input source textures, sprites, render targets, and any other brushes to be used in a more generic way.
     /// </summary>
diff --git a/Source/Engine/UI/GUI/Brushes/SpriteBrush.cs b/Source/Engine/UI/GUI/Brushes/SpriteBrush.cs
index 9867e1f25..05c0bb2e2 100644
--- a/Source/Engine/UI/GUI/Brushes/SpriteBrush.cs
+++ b/Source/Engine/UI/GUI/Brushes/SpriteBrush.cs
@@ -11,9 +11,15 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// The sprite.
         /// </summary>
-        [ExpandGroups]
+        [ExpandGroups, EditorOrder(0), Tooltip("The sprite.")]
         public SpriteHandle Sprite;
 
+        /// <summary>
+        /// The texture sampling filter mode.
+        /// </summary>
+        [ExpandGroups, EditorOrder(1), Tooltip("The texture sampling filter mode.")]
+        public BrushFilter Filter = BrushFilter.Linear;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="SpriteBrush"/> class.
         /// </summary>
@@ -36,7 +42,10 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         public void Draw(Rectangle rect, Color color)
         {
-            Render2D.DrawSprite(Sprite, rect, color);
+            if (Filter == BrushFilter.Point)
+                Render2D.DrawSpritePoint(Sprite, rect, color);
+            else
+                Render2D.DrawSprite(Sprite, rect, color);
         }
     }
 }
diff --git a/Source/Engine/UI/GUI/Brushes/TextureBrush.cs b/Source/Engine/UI/GUI/Brushes/TextureBrush.cs
index 118128c71..1f772e0a6 100644
--- a/Source/Engine/UI/GUI/Brushes/TextureBrush.cs
+++ b/Source/Engine/UI/GUI/Brushes/TextureBrush.cs
@@ -1,5 +1,7 @@
 // Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
 
+using System;
+
 namespace FlaxEngine.GUI
 {
     /// <summary>
@@ -11,9 +13,15 @@ namespace FlaxEngine.GUI
         /// <summary>
         /// The texture.
         /// </summary>
-        [ExpandGroups, Tooltip("The texture asset.")]
+        [ExpandGroups, EditorOrder(0), Tooltip("The texture asset.")]
         public Texture Texture;
 
+        /// <summary>
+        /// The texture sampling filter mode.
+        /// </summary>
+        [ExpandGroups, EditorOrder(1), Tooltip("The texture sampling filter mode.")]
+        public BrushFilter Filter = BrushFilter.Linear;
+
         /// <summary>
         /// Initializes a new instance of the <see cref="TextureBrush"/> class.
         /// </summary>
@@ -36,7 +44,10 @@ namespace FlaxEngine.GUI
         /// <inheritdoc />
         public void Draw(Rectangle rect, Color color)
         {
-            Render2D.DrawTexture(Texture, rect, color);
+            if (Filter == BrushFilter.Point)
+                Render2D.DrawTexturePoint(Texture?.Texture, rect, color);
+            else
+                Render2D.DrawTexture(Texture, rect, color);
         }
     }
 }