add wayland support with melonds/duckstation method

src/citra_qt/externals/duckstation/gl/x11_window.h

@@ -0,0 +1,49 @@
+#pragma once
+#include "../duckstation_compat.h"
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+
+namespace GL {
+using namespace citra;
+class X11Window
+{
+public:
+  X11Window();
+  ~X11Window();
+
+  ALWAYS_INLINE Window GetWindow() const { return m_window; }
+  ALWAYS_INLINE u32 GetWidth() const { return m_width; }
+  ALWAYS_INLINE u32 GetHeight() const { return m_height; }
+
+  bool Create(Display* display, Window parent_window, const XVisualInfo* vi);
+  void Destroy();
+
+  // Setting a width/height of 0 will use parent dimensions.
+  void Resize(u32 width = 0, u32 height = 0);
+
+private:
+  Display* m_display = nullptr;
+  Window m_parent_window = {};
+  Window m_window = {};
+  Colormap m_colormap = {};
+  u32 m_width = 0;
+  u32 m_height = 0;
+};
+
+// Helper class for managing X errors
+class X11InhibitErrors
+{
+public:
+  X11InhibitErrors();
+  ~X11InhibitErrors();
+
+  ALWAYS_INLINE bool HadError() const { return m_had_error; }
+
+private:
+  static int ErrorHandler(Display* display, XErrorEvent* ee);
+
+  XErrorHandler m_old_handler = {};
+  bool m_had_error = false;
+};
+
+} // namespace GL