Massive refactoring of xenia::ui and GL swap behavior.

This seems to dramatically improve most games (especially with
--vsync=false), though it may cause swap issues with others.
New code should be easier to port, and enables elemental-forms to be
drawn for any emulator UI.

src/xenia/ui/window_win.h

@@ -0,0 +1,94 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2014 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_WINDOW_WIN_H_
+#define XENIA_UI_WINDOW_WIN_H_
+
+#include <memory>
+#include <string>
+
+#include "xenia/ui/menu_item.h"
+#include "xenia/ui/window.h"
+
+namespace xe {
+namespace ui {
+
+class Win32Window : public Window {
+  using super = Window;
+
+ public:
+  Win32Window(Loop* loop, const std::wstring& title);
+  ~Win32Window() override;
+
+  NativeWindowHandle native_handle() const override { return hwnd_; }
+  HWND hwnd() const { return hwnd_; }
+
+  bool set_title(const std::wstring& title) override;
+
+  bool is_fullscreen() const override;
+  void ToggleFullscreen(bool fullscreen) override;
+
+  void set_cursor_visible(bool value) override;
+  void set_focus(bool value) override;
+
+  void Resize(int32_t width, int32_t height) override;
+  void Resize(int32_t left, int32_t top, int32_t right,
+              int32_t bottom) override;
+
+  bool Initialize() override;
+  void Invalidate() override;
+  void Close() override;
+
+ protected:
+  bool OnCreate() override;
+  void OnMainMenuChange() override;
+  void OnDestroy() override;
+  void OnClose() override;
+
+  void OnResize(UIEvent& e) override;
+
+  static LRESULT CALLBACK
+  WndProcThunk(HWND hWnd, UINT message, WPARAM wParam, LPARAM lParam);
+  virtual LRESULT WndProc(HWND hWnd, UINT message, WPARAM wParam,
+                          LPARAM lParam);
+
+ private:
+  void EnableMMCSS();
+  bool HandleMouse(UINT message, WPARAM wParam, LPARAM lParam);
+  bool HandleKeyboard(UINT message, WPARAM wParam, LPARAM lParam);
+
+  HWND hwnd_ = nullptr;
+  bool invalidated_ = true;
+  bool closing_ = false;
+
+  WINDOWPLACEMENT windowed_pos_;
+};
+
+class Win32MenuItem : public MenuItem {
+ public:
+  Win32MenuItem(Type type, const std::wstring& text, const std::wstring& hotkey,
+                std::function<void()> callback);
+  ~Win32MenuItem() override;
+
+  HMENU handle() { return handle_; }
+
+  using MenuItem::OnSelected;
+
+ protected:
+  void OnChildAdded(MenuItem* child_item) override;
+  void OnChildRemoved(MenuItem* child_item) override;
+
+ private:
+  HMENU handle_ = nullptr;
+};
+
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_WINDOW_WIN_H_