add wayland support with melonds/duckstation method

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

@@ -0,0 +1,50 @@
+#pragma once
+#include "context.h"
+#include "loader.h"
+
+#if defined(__APPLE__) && defined(__OBJC__)
+#import <AppKit/AppKit.h>
+#else
+struct NSOpenGLContext;
+struct NSOpenGLPixelFormat;
+struct NSView;
+#define __bridge
+#endif
+
+namespace GL {
+
+using namespace melonDS;
+class ContextAGL final : public Context
+{
+public:
+  ContextAGL(const WindowInfo& wi);
+  ~ContextAGL() override;
+
+  static std::unique_ptr<Context> Create(const WindowInfo& wi, const Version* versions_to_try,
+                                         size_t num_versions_to_try);
+
+  void* GetProcAddress(const char* name) override;
+  bool ChangeSurface(const WindowInfo& new_wi) override;
+  void ResizeSurface(u32 new_surface_width = 0, u32 new_surface_height = 0) override;
+  bool SwapBuffers() override;
+  bool MakeCurrent() override;
+  bool DoneCurrent() override;
+  bool SetSwapInterval(s32 interval) override;
+  std::unique_ptr<Context> CreateSharedContext(const WindowInfo& wi) override;
+
+private:
+  ALWAYS_INLINE NSView* GetView() const { return static_cast<NSView*>((__bridge NSView*)m_wi.window_handle); }
+
+  bool Initialize(const Version* versions_to_try, size_t num_versions_to_try);
+  bool CreateContext(NSOpenGLContext* share_context, int profile, bool make_current);
+  void BindContextToView();
+
+  // returns true if dimensions have changed
+  bool UpdateDimensions();
+
+  NSOpenGLContext* m_context = nullptr;
+  NSOpenGLPixelFormat* m_pixel_format = nullptr;
+  void* m_opengl_module_handle = nullptr;
+};
+
+} // namespace GL