Start Metal Backend

Revert build yml changes

src/Ryujinx/UI/Renderer/EmbeddedWindowMetal.cs

@@ -0,0 +1,25 @@
+using SPB.Windowing;
+using SPB.Platform.Metal;
+using System;
+
+namespace Ryujinx.UI.Renderer
+{
+    public class EmbeddedWindowMetal : EmbeddedWindow
+    {
+        public SimpleMetalWindow CreateSurface()
+        {
+            SimpleMetalWindow simpleMetalWindow;
+
+            if (OperatingSystem.IsMacOS())
+            {
+                simpleMetalWindow = new SimpleMetalWindow(new NativeHandle(NsView), new NativeHandle(MetalLayer));
+            }
+            else
+            {
+                throw new PlatformNotSupportedException();
+            }
+
+            return simpleMetalWindow;
+        }
+    }
+}

src/Ryujinx/UI/ViewModels/SettingsViewModel.cs

@@ -111,6 +111,8 @@ namespace Ryujinx.Ava.UI.ViewModels
             }
         }
 
+        public bool IsMetalAvailable => OperatingSystem.IsMacOS();
+
         public bool IsOpenGLAvailable => !OperatingSystem.IsMacOS();
 
         public bool IsHypervisorAvailable => OperatingSystem.IsMacOS() && RuntimeInformation.ProcessArchitecture == Architecture.Arm64;

src/Ryujinx/UI/Views/Settings/SettingsGraphicsView.axaml

@@ -43,6 +43,9 @@
                             <ComboBoxItem IsEnabled="{Binding IsOpenGLAvailable}">
                                 <TextBlock Text="OpenGL" />
                             </ComboBoxItem>
+                            <ComboBoxItem IsVisible="{Binding IsMetalAvailable}">
+                                <TextBlock Text="Metal" />
+                            </ComboBoxItem>
                         </ComboBox>
                     </StackPanel>
                     <StackPanel Orientation="Horizontal" IsVisible="{Binding IsVulkanSelected}">