Remove AvaloniaNativePlatformOptions.UseGpu as it's not supported in 11.0 (always uses GPU)

src/Avalonia.Native/AvaloniaNativePlatform.cs

@@ -123,20 +123,18 @@ namespace Avalonia.Native
             hotkeys.MoveCursorToTheEndOfLineWithSelection.Add(new KeyGesture(Key.Right, hotkeys.CommandModifiers | hotkeys.SelectionModifiers));
 
             AvaloniaLocator.CurrentMutable.Bind<PlatformHotkeyConfiguration>().ToConstant(hotkeys);
-            
-            if (_options.UseGpu)
+
+            // TODO: add software and metal support via RenderingMode options param
+            try
+            {
+                _platformGl = new AvaloniaNativeGlPlatformGraphics(_factory.ObtainGlDisplay());
+                AvaloniaLocator.CurrentMutable
+                    .Bind<IPlatformGraphics>().ToConstant(_platformGl);
+
+            }
+            catch (Exception)
             {
-                try
-                {
-                    _platformGl = new AvaloniaNativeGlPlatformGraphics(_factory.ObtainGlDisplay());
-                    AvaloniaLocator.CurrentMutable
-                        .Bind<IPlatformGraphics>().ToConstant(_platformGl);
-
-                }
-                catch (Exception)
-                {
-                    // ignored
-                }
+                // ignored
             }
             
             Compositor = new Compositor(_platformGl, true);

src/Avalonia.Native/AvaloniaNativePlatformExtensions.cs

@@ -1,4 +1,5 @@
 using System;
+using System.Collections.Generic;
 using Avalonia.Controls;
 using Avalonia.Native;
 
@@ -30,11 +31,6 @@ namespace Avalonia
     /// </summary>
     public class AvaloniaNativePlatformOptions
     {
-        /// <summary>
-        /// Determines whether to use GPU for rendering in your project. The default value is true.
-        /// </summary>
-        public bool UseGpu { get; set; } = true;
-
         /// <summary>
         /// Embeds popups to the window when set to true. The default value is false.
         /// </summary>

src/Avalonia.Native/WindowImpl.cs

@@ -24,7 +24,7 @@ namespace Avalonia.Native
         private bool _canResize = true;
 
         internal WindowImpl(IAvaloniaNativeFactory factory, AvaloniaNativePlatformOptions opts,
-            AvaloniaNativeGlPlatformGraphics glFeature) : base(factory, opts, glFeature)
+            AvaloniaNativeGlPlatformGraphics glFeature) : base(factory, glFeature)
         {
             _opts = opts;
             _glFeature = glFeature;

src/Avalonia.Native/WindowImplBase.cs

@@ -67,11 +67,10 @@ namespace Avalonia.Native
         private PlatformBehaviorInhibition _platformBehaviorInhibition;
         private WindowTransparencyLevel _transparencyLevel = WindowTransparencyLevel.None;
 
-        internal WindowBaseImpl(IAvaloniaNativeFactory factory, AvaloniaNativePlatformOptions opts,
-            AvaloniaNativeGlPlatformGraphics glFeature)
+        internal WindowBaseImpl(IAvaloniaNativeFactory factory, AvaloniaNativeGlPlatformGraphics glFeature)
         {
             _factory = factory;
-            _gpu = opts.UseGpu && glFeature != null;
+            _gpu = glFeature != null;
 
             _keyboard = AvaloniaLocator.Current.GetService<IKeyboardDevice>();
             _mouse = new MouseDevice();