feat: CameraView OpenGL render

GSS2.Test/App.axaml.cs

@@ -3,6 +3,7 @@ using Avalonia.Controls.ApplicationLifetimes;
 using Avalonia.Markup.Xaml;
 
 using GSS2.Test.ViewModels;
+using GSS2.Test.Views;
 
 namespace GSS2.Test;
 
@@ -15,14 +16,32 @@ public partial class App : Application
 
     public override void OnFrameworkInitializationCompleted()
     {
+        if (ApplicationLifetime is null)
+            throw new InvalidOperationException("Application framework initialization cannot be fulfilled, ApplicationLifetime is null");
+
         if (ApplicationLifetime is IClassicDesktopStyleApplicationLifetime desktop)
         {
+            Console.WriteLine("Application running in classic style");
             desktop.Startup += (_, _) => Program.ApplicationHost.RunAsync();
             desktop.Exit += (_, _) => Program.ApplicationHost.StopAsync();
 
-            desktop.MainWindow = new MainWindow();
-            desktop.MainWindow.Activated += (_, _) => desktop.MainWindow.DataContext = Program.ApplicationHost.Services.GetRequiredService<MainWindowViewModel>();
+            desktop.MainWindow = new MainWindow()
+            {
+                DataContext = Program.ApplicationHost.Services.GetRequiredService<MainWindowViewModel>()
+            };
         }
+        else if (ApplicationLifetime is ISingleViewApplicationLifetime singleView)
+        {
+            Console.WriteLine("Application running in single view style");
+            var loggerFactory = Program.ApplicationHost.Services.GetRequiredService<ILoggerFactory>();
+            var logger = loggerFactory.CreateLogger<MainView>();
+            singleView.MainView = new MainView(logger)
+            {
+                DataContext = Program.ApplicationHost.Services.GetRequiredService<MainViewModel>()
+            };
+        }
+        else
+            throw new InvalidOperationException($"Application framework initialization cannot be fulfilled, ApplicationLifetime has unknown type inherited from: {string.Join(", ", ApplicationLifetime.GetType().GetInterfaces().Select(i => i.FullName))}");
         base.OnFrameworkInitializationCompleted();
     }
 }