DolphinNoGUI: Runtime selection of platform

Source/Core/DolphinNoGUI/Platform.h

@@ -0,0 +1,48 @@
+// Copyright 2018 Dolphin Emulator Project
+// Licensed under GPLv2+
+// Refer to the license.txt file included.
+
+#pragma once
+
+#include <memory>
+#include <string>
+
+#include "Common/Flag.h"
+#include "Common/WindowSystemInfo.h"
+
+class Platform
+{
+public:
+  virtual ~Platform();
+
+  bool IsRunning() const { return m_running.IsSet(); }
+  bool IsWindowFocused() const { return m_window_focus; }
+  bool IsWindowFullscreen() const { return m_window_fullscreen; }
+
+  virtual bool Init();
+  virtual void SetTitle(const std::string& title);
+  virtual void MainLoop() = 0;
+
+  virtual WindowSystemInfo GetWindowSystemInfo() const = 0;
+
+  // Requests a graceful shutdown, from SIGINT/SIGTERM.
+  void RequestShutdown();
+
+  // Request an immediate shutdown.
+  void Stop();
+
+  static std::unique_ptr<Platform> CreateHeadlessPlatform();
+#ifdef HAVE_X11
+  static std::unique_ptr<Platform> CreateX11Platform();
+#endif
+
+protected:
+  void UpdateRunningFlag();
+
+  Common::Flag m_running{true};
+  Common::Flag m_shutdown_requested{false};
+  Common::Flag m_tried_graceful_shutdown{false};
+
+  bool m_window_focus = true;
+  bool m_window_fullscreen = false;
+};