gtk3: Add base for future Vulkan integration (#2260)

* gtk3: Add base for future Vulkan integration

This PR puts in place the fondation for the future Vulkan integration on
the GTK3 UI.

This also updated SPB to 0.0.3-build14 that fixed a use after free on
XErrorHandler on Linux.

* Address rip's comments

* Merge GLWidget inside GLRenderer

* Clean up and deduplicate renderer implementations

* Address shahil's comments

* Address Ac_K's comments

* Address gdkchan's comments

Ryujinx/Ui/VKRenderer.cs

@@ -0,0 +1,80 @@
+using Gdk;
+using Gtk;
+using Ryujinx.Common.Configuration;
+using Ryujinx.Input.HLE;
+using SPB.Graphics.Vulkan;
+using SPB.Platform.Win32;
+using SPB.Platform.X11;
+using SPB.Windowing;
+using System;
+using System.Runtime.InteropServices;
+
+namespace Ryujinx.Ui
+{
+    public class VKRenderer : RendererWidgetBase
+    {
+        public NativeWindowBase NativeWindow { get; private set; }
+
+        public VKRenderer(InputManager inputManager, GraphicsDebugLevel glLogLevel) : base(inputManager, glLogLevel) { }
+
+        private NativeWindowBase RetrieveNativeWindow()
+        {
+            if (RuntimeInformation.IsOSPlatform(OSPlatform.Windows))
+            {
+                IntPtr windowHandle = gdk_win32_window_get_handle(Window.Handle);
+
+                return new SimpleWin32Window(new NativeHandle(windowHandle));
+            }
+            else if (RuntimeInformation.IsOSPlatform(OSPlatform.Linux))
+            {
+                IntPtr displayHandle = gdk_x11_display_get_xdisplay(Display.Handle);
+                IntPtr windowHandle = gdk_x11_window_get_xid(Window.Handle);
+
+                return new SimpleX11Window(new NativeHandle(displayHandle), new NativeHandle(windowHandle));
+            }
+
+            throw new NotImplementedException();
+        }
+
+        [DllImport("libgdk-3-0.dll")]
+        private static extern IntPtr gdk_win32_window_get_handle(IntPtr d);
+
+        [DllImport("libgdk-3.so.0")]
+        private static extern IntPtr gdk_x11_display_get_xdisplay(IntPtr gdkDisplay);
+
+        [DllImport("libgdk-3.so.0")]
+        private static extern IntPtr gdk_x11_window_get_xid(IntPtr gdkWindow);
+
+        protected override bool OnConfigureEvent(EventConfigure evnt)
+        {
+            if (NativeWindow == null)
+            {
+                NativeWindow = RetrieveNativeWindow();
+
+                WaitEvent.Set();
+            }
+
+            return base.OnConfigureEvent(evnt);
+        }
+
+        public unsafe IntPtr CreateWindowSurface(IntPtr instance)
+        {
+            return VulkanHelper.CreateWindowSurface(instance, NativeWindow);
+        }
+
+        public override void InitializeRenderer() { }
+
+        public override void SwapBuffers() { }
+
+        public override string GetGpuVendorName()
+        {
+            return "Vulkan (Unknown)";
+        }
+
+        protected override void Dispose(bool disposing)
+        {
+            Device.DisposeGpu();
+            NpadManager.Dispose();
+        }
+    }
+}