[UI] Loop thread to main thread WindowedAppContext

src/xenia/ui/windowed_app_context_win.h

@@ -0,0 +1,58 @@
+/**
+ ******************************************************************************
+ * Xenia : Xbox 360 Emulator Research Project                                 *
+ ******************************************************************************
+ * Copyright 2021 Ben Vanik. All rights reserved.                             *
+ * Released under the BSD license - see LICENSE in the root for more details. *
+ ******************************************************************************
+ */
+
+#ifndef XENIA_UI_WINDOWED_APP_CONTEXT_WIN_H_
+#define XENIA_UI_WINDOWED_APP_CONTEXT_WIN_H_
+
+#include <memory>
+
+#include "xenia/base/platform_win.h"
+#include "xenia/ui/windowed_app_context.h"
+
+namespace xe {
+namespace ui {
+
+class Win32WindowedAppContext final : public WindowedAppContext {
+ public:
+  // Must call Initialize and check its result after creating to be able to
+  // perform pending function calls.
+  explicit Win32WindowedAppContext(HINSTANCE hinstance, int show_cmd)
+      : hinstance_(hinstance), show_cmd_(show_cmd) {}
+  ~Win32WindowedAppContext();
+
+  bool Initialize();
+
+  HINSTANCE hinstance() const { return hinstance_; }
+  int show_cmd() const { return show_cmd_; }
+
+  void NotifyUILoopOfPendingFunctions() override;
+
+  void PlatformQuitFromUIThread() override;
+
+  int RunMainMessageLoop();
+
+ private:
+  enum : UINT {
+    kPendingFunctionsWindowClassMessageExecute = WM_USER,
+  };
+
+  static LRESULT CALLBACK PendingFunctionsWndProc(HWND hwnd, UINT message,
+                                                  WPARAM wparam, LPARAM lparam);
+
+  HINSTANCE hinstance_;
+  int show_cmd_;
+  HWND pending_functions_hwnd_ = nullptr;
+
+  static bool pending_functions_window_class_registered_;
+};
+
+}  // namespace ui
+}  // namespace xe
+
+#endif  // XENIA_UI_WINDOWED_APP_CONTEXT_WIN_H_