1 files changed, 136 insertions, 0 deletions
diff --git a/Ryujinx.Ava/Ui/Backend/Vulkan/VulkanInstance.cs b/Ryujinx.Ava/Ui/Backend/Vulkan/VulkanInstance.cs
new file mode 100644
index 00000000..a3a9ea61
--- /dev/null
+++ b/Ryujinx.Ava/Ui/Backend/Vulkan/VulkanInstance.cs
@@ -0,0 +1,136 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Runtime.InteropServices;
+using Silk.NET.Core;
+using Silk.NET.Vulkan;
+using Silk.NET.Vulkan.Extensions.EXT;
+
+namespace Ryujinx.Ava.Ui.Vulkan
+{
+    public class VulkanInstance : IDisposable
+    {
+        private const string EngineName = "Avalonia Vulkan";
+
+        private VulkanInstance(Instance apiHandle, Vk api)
+        {
+            InternalHandle = apiHandle;
+            Api = api;
+        }
+
+        public IntPtr Handle => InternalHandle.Handle;
+
+        internal Instance InternalHandle { get; }
+        public Vk Api { get; }
+
+        internal static IEnumerable<string> RequiredInstanceExtensions
+        {
+            get
+            {
+                yield return "VK_KHR_surface";
+                if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+                {
+                    yield return "VK_KHR_xlib_surface";
+                }
+                else if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+                {
+                    yield return "VK_KHR_win32_surface";
+                }
+            }
+        }
+
+        public void Dispose()
+        {
+            Api?.DestroyInstance(InternalHandle, Span<AllocationCallbacks>.Empty);
+            Api?.Dispose();
+        }
+
+        internal static unsafe VulkanInstance Create(VulkanOptions options)
+        {
+            var api = Vk.GetApi();
+            var applicationName = Marshal.StringToHGlobalAnsi(options.ApplicationName);
+            var engineName = Marshal.StringToHGlobalAnsi(EngineName);
+            var enabledExtensions = new List<string>(options.InstanceExtensions);
+
+            enabledExtensions.AddRange(RequiredInstanceExtensions);
+
+            var applicationInfo = new ApplicationInfo
+            {
+                PApplicationName = (byte*)applicationName,
+                ApiVersion = new Version32((uint)options.VulkanVersion.Major, (uint)options.VulkanVersion.Minor,
+                    (uint)options.VulkanVersion.Build),
+                PEngineName = (byte*)engineName,
+                EngineVersion = new Version32(1, 0, 0),
+                ApplicationVersion = new Version32(1, 0, 0)
+            };
+
+            var enabledLayers = new HashSet<string>();
+
+            if (options.UseDebug)
+            {
+                enabledExtensions.Add(ExtDebugUtils.ExtensionName);
+                enabledExtensions.Add(ExtDebugReport.ExtensionName);
+                if (IsLayerAvailable(api, "VK_LAYER_KHRONOS_validation"))
+                    enabledLayers.Add("VK_LAYER_KHRONOS_validation");
+            }
+
+            foreach (var layer in options.EnabledLayers)
+                enabledLayers.Add(layer);
+
+            var ppEnabledExtensions = stackalloc IntPtr[enabledExtensions.Count];
+            var ppEnabledLayers = stackalloc IntPtr[enabledLayers.Count];
+
+            for (var i = 0; i < enabledExtensions.Count; i++)
+                ppEnabledExtensions[i] = Marshal.StringToHGlobalAnsi(enabledExtensions[i]);
+
+            var layers = enabledLayers.ToList();
+
+            for (var i = 0; i < enabledLayers.Count; i++)
+                ppEnabledLayers[i] = Marshal.StringToHGlobalAnsi(layers[i]);
+
+            var instanceCreateInfo = new InstanceCreateInfo
+            {
+                SType = StructureType.InstanceCreateInfo,
+                PApplicationInfo = &applicationInfo,
+                PpEnabledExtensionNames = (byte**)ppEnabledExtensions,
+                PpEnabledLayerNames = (byte**)ppEnabledLayers,
+                EnabledExtensionCount = (uint)enabledExtensions.Count,
+                EnabledLayerCount = (uint)enabledLayers.Count
+            };
+
+            api.CreateInstance(in instanceCreateInfo, null, out var instance).ThrowOnError();
+
+            Marshal.FreeHGlobal(applicationName);
+            Marshal.FreeHGlobal(engineName);
+
+            for (var i = 0; i < enabledExtensions.Count; i++) Marshal.FreeHGlobal(ppEnabledExtensions[i]);
+
+            for (var i = 0; i < enabledLayers.Count; i++) Marshal.FreeHGlobal(ppEnabledLayers[i]);
+
+            return new VulkanInstance(instance, api);
+        }
+
+        private static unsafe bool IsLayerAvailable(Vk api, string layerName)
+        {
+            uint layerPropertiesCount;
+
+            api.EnumerateInstanceLayerProperties(&layerPropertiesCount, null).ThrowOnError();
+
+            var layerProperties = new LayerProperties[layerPropertiesCount];
+
+            fixed (LayerProperties* pLayerProperties = layerProperties)
+            {
+                api.EnumerateInstanceLayerProperties(&layerPropertiesCount, layerProperties).ThrowOnError();
+
+                for (var i = 0; i < layerPropertiesCount; i++)
+                {
+                    var currentLayerName = Marshal.PtrToStringAnsi((IntPtr)pLayerProperties[i].LayerName);
+
+                    if (currentLayerName == layerName) return true;
+                }
+            }
+
+            return false;
+        }
+    }
+}