add vulkan support for android (#15588)

src/Android/Avalonia.Android/AndroidPlatform.cs

@@ -4,13 +4,15 @@
 using Avalonia.Android;
 using Avalonia.Android.Platform;
 using Avalonia.Android.Platform.Input;
+using Avalonia.Android.Platform.Vulkan;
 using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Input;
 using Avalonia.Input.Platform;
 using Avalonia.OpenGL.Egl;
 using Avalonia.Platform;
 using Avalonia.Rendering;
 using Avalonia.Rendering.Composition;
+using Avalonia.Vulkan;
 
 namespace Avalonia
 {
@@ -38,7 +40,12 @@ public enum AndroidRenderingMode
         /// <summary>
         /// Enables android EGL rendering.
         /// </summary>
-        Egl = 2
+        Egl = 2,
+
+        /// <summary>
+        /// Enables Vulkan rendering
+        /// </summary>
+        Vulkan = 3
     }
 
     public sealed class AndroidPlatformOptions
@@ -114,6 +121,13 @@ public static void Initialize()
                         return egl;
                     }
                 }
+
+                if (renderingMode == AndroidRenderingMode.Vulkan)
+                {
+                    var vulkan = VulkanSupport.TryInitialize(AvaloniaLocator.Current.GetService<VulkanOptions>() ?? new());
+                    if (vulkan != null)
+                        return vulkan;
+                }
             }
 
             throw new InvalidOperationException($"{nameof(AndroidPlatformOptions)}.{nameof(AndroidPlatformOptions.RenderingMode)} has a value of \"{string.Join(", ", opts.RenderingMode)}\", but no options were applied.");

src/Android/Avalonia.Android/Avalonia.Android.csproj

@@ -17,4 +17,8 @@
   <Import Project="..\..\..\build\DevAnalyzers.props" />
   <Import Project="..\..\..\build\TrimmingEnable.props" />
   <Import Project="..\..\..\build\NullableEnable.props" />
+  <Import Project="..\..\..\build\SourceGenerators.props" />
+  <ItemGroup>
+    <Compile Remove="..\..\Shared\SourceGeneratorAttributes.cs" />
+  </ItemGroup>
 </Project>

src/Android/Avalonia.Android/Platform/Vulkan/VulkanNativeInterop.cs

@@ -0,0 +1,25 @@
+using System;
+using Avalonia.SourceGenerator;
+using Avalonia.Vulkan;
+
+namespace Avalonia.Android.Platform.Vulkan;
+partial class AndroidVulkanInterface
+{
+    public AndroidVulkanInterface(IVulkanInstance instance)
+    {
+        Initialize(name => instance.GetInstanceProcAddress(instance.Handle, name));
+    }
+
+    [GetProcAddress("vkCreateAndroidSurfaceKHR")]
+    public partial int vkCreateAndroidSurfaceKHR(IntPtr instance, ref VkAndroidSurfaceCreateInfoKHR pCreateInfo,
+            IntPtr pAllocator, out ulong pSurface);
+}
+
+struct VkAndroidSurfaceCreateInfoKHR
+{
+    public const uint VK_STRUCTURE_TYPE_ANDROID_SURFACE_CREATE_INFO_KHR = 1000008000;
+    public uint sType;
+    public IntPtr pNext;
+    public uint flags;
+    public IntPtr window;
+}

src/Android/Avalonia.Android/Platform/Vulkan/VulkanSupport.cs

@@ -0,0 +1,68 @@
+using System;
+using System.Collections.Generic;
+using System.Runtime.InteropServices;
+using Avalonia.Platform;
+using Avalonia.Vulkan;
+
+namespace Avalonia.Android.Platform.Vulkan
+{
+    internal class VulkanSupport
+    {
+        [DllImport("libvulkan.so")]
+        private static extern IntPtr vkGetInstanceProcAddr(IntPtr instance, string name);
+
+        public static VulkanPlatformGraphics? TryInitialize(VulkanOptions options) =>
+            VulkanPlatformGraphics.TryCreate(options ?? new(), new VulkanPlatformSpecificOptions
+                {
+                    RequiredInstanceExtensions = { "VK_KHR_android_surface" },
+                    GetProcAddressDelegate = vkGetInstanceProcAddr,
+                    PlatformFeatures = new Dictionary<Type, object>
+                    {
+                        [typeof(IVulkanKhrSurfacePlatformSurfaceFactory)] = new VulkanSurfaceFactory()
+                    }
+                });
+
+        internal class VulkanSurfaceFactory : IVulkanKhrSurfacePlatformSurfaceFactory
+        {
+            public bool CanRenderToSurface(IVulkanPlatformGraphicsContext context, object surface) =>
+                surface is INativePlatformHandleSurface handle;
+
+            public IVulkanKhrSurfacePlatformSurface CreateSurface(IVulkanPlatformGraphicsContext context, object handle) =>
+                new AndroidVulkanSurface((INativePlatformHandleSurface)handle);
+        }
+
+        class AndroidVulkanSurface : IVulkanKhrSurfacePlatformSurface
+        {
+            private INativePlatformHandleSurface _handle;
+
+            public AndroidVulkanSurface(INativePlatformHandleSurface handle)
+            {
+                _handle = handle;
+            }
+
+            public double Scaling => _handle.Scaling;
+            public PixelSize Size => _handle.Size;
+            public ulong CreateSurface(IVulkanPlatformGraphicsContext context) =>
+                CreateAndroidSurface(_handle.Handle, context.Instance);
+
+            public void Dispose()
+            {
+                // No-op
+            }
+        }
+
+        private static ulong CreateAndroidSurface(nint handle, IVulkanInstance instance)
+        {
+            var vulkanAndroid = new AndroidVulkanInterface(instance);
+            var createInfo = new VkAndroidSurfaceCreateInfoKHR()
+            {
+
+                sType = VkAndroidSurfaceCreateInfoKHR.VK_STRUCTURE_TYPE_ANDROID_SURFACE_CREATE_INFO_KHR,
+                window = handle
+            };
+            VulkanException.ThrowOnError("vkCreateAndroidSurfaceKHR",
+                vulkanAndroid.vkCreateAndroidSurfaceKHR(instance.Handle, ref createInfo, IntPtr.Zero, out var surface));
+            return surface;
+        }
+    }
+}

src/Windows/Avalonia.Win32/Win32PlatformOptions.cs

@@ -23,6 +23,7 @@ public enum Win32RenderingMode
     /// Avalonia would try to use native Widows OpenGL with GPU rendering.
     /// </summary>
     Wgl = 3,
+
     /// <summary>
     /// Avalonia would try to use native Widows Vulkan with GPU rendering.
     /// </summary>