Add comprehensive debugging for OpenGL SPIRV compilation and improve Vulkan widget embedding approach

Co-authored-by: philstopford <1983851+philstopford@users.noreply.github.com>

Author: Copilot

Eto/Eto.Veldrid.Gtk/GtkVeldridSurfaceHandler.cs

@@ -136,23 +136,42 @@ private SwapchainSource CreateWaylandSwapchainSource(IntPtr gdkDisplay)
 
 		Console.WriteLine($"[DEBUG] DrawingArea state - Visible: {drawingArea.Visible}, Realized: {drawingArea.IsRealized}, Mapped: {drawingArea.IsMapped}, Window.IsVisible: {drawingArea.Window.IsVisible}");
 
-		// Get Wayland handles from DrawingArea
+		// Try to get Wayland handles from DrawingArea without forcing native window creation
 		var waylandDisplay = X11Interop.gdk_wayland_display_get_wl_display(gdkDisplay);
 		var waylandSurface = X11Interop.gdk_wayland_window_get_wl_surface(drawingArea.Window.Handle);
 
 		if (waylandDisplay == IntPtr.Zero || waylandSurface == IntPtr.Zero)
 		{
-			Console.WriteLine("[DEBUG] Failed to get Wayland handles initially, trying native window creation");
-			// Only create native window as a last resort
-			X11Interop.gdk_window_ensure_native(drawingArea.Window.Handle);
+			Console.WriteLine("[DEBUG] Failed to get Wayland handles from DrawingArea, trying parent window");
 
-			// Try again after native window creation
-			waylandDisplay = X11Interop.gdk_wayland_display_get_wl_display(gdkDisplay);
-			waylandSurface = X11Interop.gdk_wayland_window_get_wl_surface(drawingArea.Window.Handle);
+			// Try to use the parent window's surface instead of creating a native window
+			// This should prevent the separate window issue
+			var topLevelWindow = drawingArea.Toplevel;
+			if (topLevelWindow?.Window != null)
+			{
+				Console.WriteLine("[DEBUG] Trying to use parent window for Wayland surface");
+				waylandSurface = X11Interop.gdk_wayland_window_get_wl_surface(topLevelWindow.Window.Handle);
+				
+				if (waylandSurface != IntPtr.Zero)
+				{
+					Console.WriteLine("[DEBUG] Successfully got Wayland surface from parent window");
+				}
+			}
 
 			if (waylandDisplay == IntPtr.Zero || waylandSurface == IntPtr.Zero)
 			{
-				throw new InvalidOperationException($"Failed to get Wayland handles even after native window creation - Display: {waylandDisplay}, Surface: {waylandSurface}");
+				// As a last resort, try native window creation - but this may cause separation
+				Console.WriteLine("[DEBUG] Still no Wayland handles, reluctantly trying native window creation");
+				Console.WriteLine("[DEBUG] WARNING: This may cause the viewport to appear as a separate window");
+				X11Interop.gdk_window_ensure_native(drawingArea.Window.Handle);
+				
+				waylandDisplay = X11Interop.gdk_wayland_display_get_wl_display(gdkDisplay);
+				waylandSurface = X11Interop.gdk_wayland_window_get_wl_surface(drawingArea.Window.Handle);
+				
+				if (waylandDisplay == IntPtr.Zero || waylandSurface == IntPtr.Zero)
+				{
+					throw new InvalidOperationException($"Failed to get Wayland handles even after native window creation - Display: {waylandDisplay}, Surface: {waylandSurface}");
+				}
 			}
 		}
 

Eto/Eto.VeldridSurface/VeldridDriver.cs

@@ -1,6 +1,8 @@
 using Eto.Veldrid;
 using System.Numerics;
 using System.Runtime.InteropServices;
+using System.IO;
+using System.Linq;
 using Veldrid;
 using Veldrid.SPIRV;
 using VeldridEto;
@@ -49,6 +51,16 @@ public void SetUpVeldrid()
 
 		private void CreateResources()
 		{
+			// Check if libveldrid-spirv.so is available for SPIRV compilation
+			bool nativeLibExists = File.Exists("libveldrid-spirv.so");
+			Console.WriteLine($"[DEBUG] libveldrid-spirv.so exists in current directory: {nativeLibExists}");
+			if (!nativeLibExists)
+			{
+				Console.WriteLine($"[DEBUG] Current directory: {Directory.GetCurrentDirectory()}");
+				var files = Directory.GetFiles(".", "*.so").Take(5);
+				Console.WriteLine($"[DEBUG] Available .so files: {string.Join(", ", files)}");
+			}
+			
 			// Veldrid.SPIRV is an additional library that complements Veldrid
 			// by simplifying the development of cross-backend shaders, and is
 			// currently the recommended approach to doing so:
@@ -115,7 +127,25 @@ private void CreateResources()
 			Console.WriteLine($"[DEBUG] About to create shaders using CreateFromSpirv for backend: {Surface.GraphicsDevice.BackendType}");
 			Console.WriteLine($"[DEBUG] ResourceFactory type: {factory.GetType().Name}");
 
-			Shader[] shaders = factory.CreateFromSpirv(vertex, fragment, options);
+			Shader[] shaders;
+			try 
+			{
+				shaders = factory.CreateFromSpirv(vertex, fragment, options);
+				Console.WriteLine($"[DEBUG] Successfully created {shaders.Length} shaders using SPIRV compilation");
+			}
+			catch (Exception ex)
+			{
+				Console.WriteLine($"[DEBUG] SPIRV shader compilation failed: {ex.GetType().Name}: {ex.Message}");
+				Console.WriteLine($"[DEBUG] Exception stack trace: {ex.StackTrace}");
+				
+				// If SPIRV compilation fails, it's likely due to missing native library or GLSL source being treated as SPIRV
+				Console.WriteLine($"[DEBUG] This error suggests either:");
+				Console.WriteLine($"[DEBUG] 1. libveldrid-spirv.so is not available or not loadable");
+				Console.WriteLine($"[DEBUG] 2. GLSL source files are being passed to SPIRV compiler instead of pre-compiled bytecode");
+				Console.WriteLine($"[DEBUG] 3. The shader files contain invalid GLSL syntax");
+				
+				throw;
+			}
 
 			ResourceLayout modelMatrixLayout = factory.CreateResourceLayout(
 				new ResourceLayoutDescription(