From f2c090fe554879a786d763d6be0fd2243479ee0b Mon Sep 17 00:00:00 2001
From: Isaac Marovitz <isaacryu@icloud.com>
Date: Thu, 3 Aug 2023 17:32:04 -0400
Subject: [PATCH] SDL2 Headless Metal Backend support

---
 .../Metal/MetalWindow.cs                      | 49 +++++++++++++++++++
 src/Ryujinx.Headless.SDL2/Program.cs          | 16 ++++--
 .../Ryujinx.Headless.SDL2.csproj              |  1 +
 3 files changed, 63 insertions(+), 3 deletions(-)
 create mode 100644 src/Ryujinx.Headless.SDL2/Metal/MetalWindow.cs

diff --git a/src/Ryujinx.Headless.SDL2/Metal/MetalWindow.cs b/src/Ryujinx.Headless.SDL2/Metal/MetalWindow.cs
new file mode 100644
index 000000000..c37bf2472
--- /dev/null
+++ b/src/Ryujinx.Headless.SDL2/Metal/MetalWindow.cs
@@ -0,0 +1,49 @@
+using Ryujinx.Common.Configuration;
+using Ryujinx.Input.HLE;
+using Ryujinx.SDL2.Common;
+using SharpMetal.QuartzCore;
+using System.Runtime.Versioning;
+using static SDL2.SDL;
+
+namespace Ryujinx.Headless.SDL2.Metal
+{
+    [SupportedOSPlatform("macos")]
+    class MetalWindow : WindowBase
+    {
+        private CAMetalLayer _caMetalLayer;
+
+        public CAMetalLayer GetLayer()
+        {
+            return _caMetalLayer;
+        }
+
+        public MetalWindow(
+            InputManager inputManager,
+            GraphicsDebugLevel glLogLevel,
+            AspectRatio aspectRatio,
+            bool enableMouse,
+            HideCursorMode hideCursorMode)
+            : base(inputManager, glLogLevel, aspectRatio, enableMouse, hideCursorMode) { }
+
+        public override SDL_WindowFlags GetWindowFlags() => SDL_WindowFlags.SDL_WINDOW_METAL;
+
+        protected override void InitializeWindowRenderer()
+        {
+            void CreateLayer()
+            {
+                _caMetalLayer = new CAMetalLayer(SDL_Metal_GetLayer(SDL_Metal_CreateView(WindowHandle)));
+            }
+
+            if (SDL2Driver.MainThreadDispatcher != null)
+            {
+                SDL2Driver.MainThreadDispatcher(CreateLayer);
+            }
+        }
+
+        protected override void InitializeRenderer() { }
+
+        protected override void FinalizeWindowRenderer() { }
+
+        protected override void SwapBuffers() { }
+    }
+}
diff --git a/src/Ryujinx.Headless.SDL2/Program.cs b/src/Ryujinx.Headless.SDL2/Program.cs
index 4ee271203..27b91418d 100644
--- a/src/Ryujinx.Headless.SDL2/Program.cs
+++ b/src/Ryujinx.Headless.SDL2/Program.cs
@@ -20,6 +20,8 @@ using Ryujinx.Graphics.Gpu.Shader;
 using Ryujinx.Graphics.OpenGL;
 using Ryujinx.Graphics.Vulkan;
 using Ryujinx.Graphics.Vulkan.MoltenVK;
+using Ryujinx.Graphics.Metal;
+using Ryujinx.Headless.SDL2.Metal;
 using Ryujinx.Headless.SDL2.OpenGL;
 using Ryujinx.Headless.SDL2.Vulkan;
 using Ryujinx.HLE;
@@ -507,9 +509,12 @@ namespace Ryujinx.Headless.SDL2
 
         private static WindowBase CreateWindow(Options options)
         {
-            return options.GraphicsBackend == GraphicsBackend.Vulkan
-                ? new VulkanWindow(_inputManager, options.LoggingGraphicsDebugLevel, options.AspectRatio, options.EnableMouse, options.HideCursorMode)
-                : new OpenGLWindow(_inputManager, options.LoggingGraphicsDebugLevel, options.AspectRatio, options.EnableMouse, options.HideCursorMode);
+            return options.GraphicsBackend switch
+            {
+                GraphicsBackend.Vulkan => new VulkanWindow(_inputManager, options.LoggingGraphicsDebugLevel, options.AspectRatio, options.EnableMouse, options.HideCursorMode),
+                GraphicsBackend.Metal => new MetalWindow(_inputManager, options.LoggingGraphicsDebugLevel, options.AspectRatio, options.EnableKeyboard, options.HideCursorMode),
+                _ => new OpenGLWindow(_inputManager, options.LoggingGraphicsDebugLevel, options.AspectRatio, options.EnableMouse, options.HideCursorMode)
+            };
         }
 
         private static IRenderer CreateRenderer(Options options, WindowBase window)
@@ -541,6 +546,11 @@ namespace Ryujinx.Headless.SDL2
                     preferredGpuId);
             }
 
+            if (options.GraphicsBackend == GraphicsBackend.Metal && window is MetalWindow metalWindow && OperatingSystem.IsMacOS())
+            {
+                return new MetalRenderer(metalWindow.GetLayer);
+            }
+
             return new OpenGLRenderer();
         }
 
diff --git a/src/Ryujinx.Headless.SDL2/Ryujinx.Headless.SDL2.csproj b/src/Ryujinx.Headless.SDL2/Ryujinx.Headless.SDL2.csproj
index 610229544..6846a6f7f 100644
--- a/src/Ryujinx.Headless.SDL2/Ryujinx.Headless.SDL2.csproj
+++ b/src/Ryujinx.Headless.SDL2/Ryujinx.Headless.SDL2.csproj
@@ -29,6 +29,7 @@
     <ProjectReference Include="..\Ryujinx.HLE\Ryujinx.HLE.csproj" />
     <ProjectReference Include="..\ARMeilleure\ARMeilleure.csproj" />
     <ProjectReference Include="..\Ryujinx.Graphics.OpenGL\Ryujinx.Graphics.OpenGL.csproj" />
+    <ProjectReference Include="..\Ryujinx.Graphics.Metal\Ryujinx.Graphics.Metal.csproj" />
     <ProjectReference Include="..\Ryujinx.Graphics.Gpu\Ryujinx.Graphics.Gpu.csproj" />
   </ItemGroup>