text: /*************************************************************************/
  /*  os_uwp.cpp                                                           */
  /*************************************************************************/
  /*                       This file is part of:                           */
  /*                           GODOT ENGINE                                */
  /*                      https://godotengine.org                          */
  /*************************************************************************/
  /* Copyright (c) 2007-2019 Juan Linietsky, Ariel Manzur.                 */
  /* Copyright (c) 2014-2019 Godot Engine contributors (cf. AUTHORS.md)    */
  /*                                                                       */
  /* Permission is hereby granted, free of charge, to any person obtaining */
  /* a copy of this software and associated documentation files (the       */
  /* "Software"), to deal in the Software without restriction, including   */
  /* without limitation the rights to use, copy, modify, merge, publish,   */
  /* distribute, sublicense, and/or sell copies of the Software, and to    */
  /* permit persons to whom the Software is furnished to do so, subject to */
  /* the following conditions:                                             */
  /*                                                                       */
  /* The above copyright notice and this permission notice shall be        */
  /* included in all copies or substantial portions of the Software.       */
  /*                                                                       */
  /* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,       */
  /* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF    */
  /* MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.*/
  /* IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY  */
  /* CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT,  */
  /* TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE     */
  /* SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.                */
  /*************************************************************************/
  
  // Must include Winsock before windows.h (included by os_uwp.h)
  #include "drivers/unix/net_socket_posix.h"
  
  #include "os_uwp.h"
  
  #include "core/io/marshalls.h"
  #include "core/project_settings.h"
  #include "drivers/gles2/rasterizer_gles2.h"
  #include "drivers/gles3/rasterizer_gles3.h"
  #include "drivers/unix/ip_unix.h"
  #include "drivers/windows/dir_access_windows.h"
  #include "drivers/windows/file_access_windows.h"
  #include "drivers/windows/mutex_windows.h"
  #include "drivers/windows/rw_lock_windows.h"
  #include "drivers/windows/semaphore_windows.h"
  #include "main/main.h"
  #include "platform/windows/windows_terminal_logger.h"
  #include "servers/audio_server.h"
  #include "servers/visual/visual_server_raster.h"
  #include "servers/visual/visual_server_wrap_mt.h"
  #include "thread_uwp.h"
  
  #include <ppltasks.h>
  #include <wrl.h>
  
  using namespace Windows::ApplicationModel::Core;
  using namespace Windows::ApplicationModel::Activation;
  using namespace Windows::UI::Core;
  using namespace Windows::UI::Input;
  using namespace Windows::UI::Popups;
  using namespace Windows::Foundation;
  using namespace Windows::Graphics::Display;
  using namespace Microsoft::WRL;
  using namespace Windows::UI::ViewManagement;
  using namespace Windows::Devices::Input;
  using namespace Windows::Devices::Sensors;
  using namespace Windows::ApplicationModel::DataTransfer;
  using namespace concurrency;
  
  int OS_UWP::get_video_driver_count() const {
  	return 2;
  }
  
  Size2 OS_UWP::get_window_size() const {
  	Size2 size;
  	size.width = video_mode.width;
  	size.height = video_mode.height;
  	return size;
  }
  
  int OS_UWP::get_current_video_driver() const {
  	return video_driver_index;
  }
  
  void OS_UWP::set_window_size(const Size2 p_size) {
  
  	Windows::Foundation::Size new_size;
  	new_size.Width = p_size.width;
  	new_size.Height = p_size.height;
  
  	ApplicationView ^ view = ApplicationView::GetForCurrentView();
  
  	if (view->TryResizeView(new_size)) {
  
  		video_mode.width = p_size.width;
  		video_mode.height = p_size.height;
  	}
  }
  
  void OS_UWP::set_window_fullscreen(bool p_enabled) {
  
  	ApplicationView ^ view = ApplicationView::GetForCurrentView();
  
  	video_mode.fullscreen = view->IsFullScreenMode;
  
  	if (video_mode.fullscreen == p_enabled)
  		return;
  
  	if (p_enabled) {
  
  		video_mode.fullscreen = view->TryEnterFullScreenMode();
  
  	} else {
  
  		view->ExitFullScreenMode();
  		video_mode.fullscreen = false;
  	}
  }
  
  bool OS_UWP::is_window_fullscreen() const {
  
  	return ApplicationView::GetForCurrentView()->IsFullScreenMode;
  }
  
  void OS_UWP::set_keep_screen_on(bool p_enabled) {
  
  	if (is_keep_screen_on() == p_enabled) return;
  
  	if (p_enabled)
  		display_request->RequestActive();
  	else
  		display_request->RequestRelease();
  
  	OS::set_keep_screen_on(p_enabled);
  }
  
  void OS_UWP::initialize_core() {
  
  	last_button_state = 0;
  
  	//RedirectIOToConsole();
  
  	ThreadUWP::make_default();
  	SemaphoreWindows::make_default();
  	MutexWindows::make_default();
  	RWLockWindows::make_default();
  
  	FileAccess::make_default<FileAccessWindows>(FileAccess::ACCESS_RESOURCES);
  	FileAccess::make_default<FileAccessWindows>(FileAccess::ACCESS_USERDATA);
  	FileAccess::make_default<FileAccessWindows>(FileAccess::ACCESS_FILESYSTEM);
  	DirAccess::make_default<DirAccessWindows>(DirAccess::ACCESS_RESOURCES);
  	DirAccess::make_default<DirAccessWindows>(DirAccess::ACCESS_USERDATA);
  	DirAccess::make_default<DirAccessWindows>(DirAccess::ACCESS_FILESYSTEM);
  
  	NetSocketPosix::make_default();
  
  	// We need to know how often the clock is updated
  	if (!QueryPerformanceFrequency((LARGE_INTEGER *)&ticks_per_second))
  		ticks_per_second = 1000;
  	// If timeAtGameStart is 0 then we get the time since
  	// the start of the computer when we call GetGameTime()
  	ticks_start = 0;
  	ticks_start = get_ticks_usec();
  
  	IP_Unix::make_default();
  
  	cursor_shape = CURSOR_ARROW;
  }
  
  bool OS_UWP::can_draw() const {
  
  	return !minimized;
  };
  
  void OS_UWP::set_window(Windows::UI::Core::CoreWindow ^ p_window) {
  	window = p_window;
  }
  
  void OS_UWP::screen_size_changed() {
  
  	gl_context->reset();
  };
  
  Error OS_UWP::initialize(const VideoMode &p_desired, int p_video_driver, int p_audio_driver) {
  
  	main_loop = NULL;
  	outside = true;
  
  	ContextEGL_UWP::Driver opengl_api_type = ContextEGL_UWP::GLES_2_0;
  
  	if (p_video_driver == VIDEO_DRIVER_GLES2) {
  		opengl_api_type = ContextEGL_UWP::GLES_2_0;
  	}
  
  	bool gl_initialization_error = false;
  
  	gl_context = NULL;
  	while (!gl_context) {
  		gl_context = memnew(ContextEGL_UWP(window, opengl_api_type));
  
  		if (gl_context->initialize() != OK) {
  			memdelete(gl_context);
  			gl_context = NULL;
  
  			if (GLOBAL_GET("rendering/quality/driver/fallback_to_gles2")) {
  				if (p_video_driver == VIDEO_DRIVER_GLES2) {
  					gl_initialization_error = true;
  					break;
  				}
  
  				p_video_driver = VIDEO_DRIVER_GLES2;
  				opengl_api_type = ContextEGL_UWP::GLES_2_0;
  			} else {
  				gl_initialization_error = true;
  				break;
  			}
  		}
  	}
  
  	while (true) {
  		if (opengl_api_type == ContextEGL_UWP::GLES_3_0) {
  			if (RasterizerGLES3::is_viable() == OK) {
  				RasterizerGLES3::register_config();
  				RasterizerGLES3::make_current();
  				break;
  			} else {
  				if (GLOBAL_GET("rendering/quality/driver/fallback_to_gles2")) {
  					p_video_driver = VIDEO_DRIVER_GLES2;
  					opengl_api_type = ContextEGL_UWP::GLES_2_0;
  					continue;
  				} else {
  					gl_initialization_error = true;
  					break;
  				}
  			}
  		}
  
  		if (opengl_api_type == ContextEGL_UWP::GLES_2_0) {
  			if (RasterizerGLES2::is_viable() == OK) {
  				RasterizerGLES2::register_config();
  				RasterizerGLES2::make_current();
  				break;
  			} else {
  				gl_initialization_error = true;
  				break;
  			}
  		}
  	}
  
  	if (gl_initialization_error) {
  		OS::get_singleton()->alert("Your video card driver does not support any of the supported OpenGL versions.\n"
  								   "Please update your drivers or if you have a very old or integrated GPU upgrade it.",
  				"Unable to initialize Video driver");
  		return ERR_UNAVAILABLE;
  	}
  
  	video_driver_index = p_video_driver;
  	gl_context->make_current();
  	gl_context->set_use_vsync(video_mode.use_vsync);
  
  	VideoMode vm;
  	vm.width = gl_context->get_window_width();
  	vm.height = gl_context->get_window_height();
  	vm.resizable = false;
  
  	ApplicationView ^ view = ApplicationView::GetForCurrentView();
  	vm.fullscreen = view->IsFullScreenMode;
  
  	view->SetDesiredBoundsMode(ApplicationViewBoundsMode::UseVisible);
  	view->PreferredLaunchWindowingMode = ApplicationViewWindowingMode::PreferredLaunchViewSize;
  
  	if (p_desired.fullscreen != view->IsFullScreenMode) {
  		if (p_desired.fullscreen) {
  
  			vm.fullscreen = view->TryEnterFullScreenMode();
  
  		} else {
  
  			view->ExitFullScreenMode();
  			vm.fullscreen = false;
  		}
  	}
  
  	Windows::Foundation::Size desired;
  	desired.Width = p_desired.width;
  	desired.Height = p_desired.height;
  
  	view->PreferredLaunchViewSize = desired;
  
  	if (view->TryResizeView(desired)) {
  
  		vm.width = view->VisibleBounds.Width;
  		vm.height = view->VisibleBounds.Height;
  	}
  
  	set_video_mode(vm);
  
  	visual_server = memnew(VisualServerRaster);
  	// FIXME: Reimplement threaded rendering
  	if (get_render_thread_mode() != RENDER_THREAD_UNSAFE) {
  		visual_server = memnew(VisualServerWrapMT(visual_server, false));
  	}
  
  	visual_server->init();
  	input = memnew(InputDefault);
  
  	joypad = ref new JoypadUWP(input);
  	joypad->register_events();
  
  	AudioDriverManager::initialize(p_audio_driver);
  
  	power_manager = memnew(PowerUWP);
  
  	managed_object->update_clipboard();
  
  	Clipboard::ContentChanged += ref new EventHandler<Platform::Object ^>(managed_object, &ManagedType::on_clipboard_changed);
  
  	accelerometer = Accelerometer::GetDefault();
  	if (accelerometer != nullptr) {
  		// 60 FPS
  		accelerometer->ReportInterval = (1.0f / 60.0f) * 1000;
  		accelerometer->ReadingChanged +=
  				ref new TypedEventHandler<Accelerometer ^, AccelerometerReadingChangedEventArgs ^>(managed_object, &ManagedType::on_accelerometer_reading_changed);
  	}
  
  	magnetometer = Magnetometer::GetDefault();
  	if (magnetometer != nullptr) {
  		// 60 FPS
  		magnetometer->ReportInterval = (1.0f / 60.0f) * 1000;
  		magnetometer->ReadingChanged +=
  				ref new TypedEventHandler<Magnetometer ^, MagnetometerReadingChangedEventArgs ^>(managed_object, &ManagedType::on_magnetometer_reading_changed);
  	}
  
  	gyrometer = Gyrometer::GetDefault();
  	if (gyrometer != nullptr) {
  		// 60 FPS
  		gyrometer->ReportInterval = (1.0f / 60.0f) * 1000;
  		gyrometer->ReadingChanged +=
  				ref new TypedEventHandler<Gyrometer ^, GyrometerReadingChangedEventArgs ^>(managed_object, &ManagedType::on_gyroscope_reading_changed);
  	}
  
  	_ensure_user_data_dir();
  
  	if (is_keep_screen_on())
  		display_request->RequestActive();
  
  	set_keep_screen_on(GLOBAL_DEF("display/window/energy_saving/keep_screen_on", true));
  
  	return OK;
  }
  
  void OS_UWP::set_clipboard(const String &p_text) {
  
  	DataPackage ^ clip = ref new DataPackage();
  	clip->RequestedOperation = DataPackageOperation::Copy;
  	clip->SetText(ref new Platform::String((const wchar_t *)p_text.c_str()));
  
  	Clipboard::SetContent(clip);
  };
  
  String OS_UWP::get_clipboard() const {
  
  	if (managed_object->clipboard != nullptr)
  		return managed_object->clipboard->Data();
  	else
  		return "";
  };
  
  void OS_UWP::input_event(const Ref<InputEvent> &p_event) {
  
  	input->parse_input_event(p_event);
  };
  
  void OS_UWP::delete_main_loop() {
  
  	if (main_loop)
  		memdelete(main_loop);
  	main_loop = NULL;
  }
  
  void OS_UWP::set_main_loop(MainLoop *p_main_loop) {
  
  	input->set_main_loop(p_main_loop);
  	main_loop = p_main_loop;
  }
  
  void OS_UWP::finalize() {
  
  	if (main_loop)
  		memdelete(main_loop);
  
  	main_loop = NULL;
  
  	visual_server->finish();
  	memdelete(visual_server);
  #ifdef OPENGL_ENABLED
  	if (gl_context)
  		memdelete(gl_context);
  #endif
  
  	memdelete(input);
  
  	joypad = nullptr;
  }
  
  void OS_UWP::finalize_core() {
  
  	NetSocketPosix::cleanup();
  }
  
  void OS_UWP::alert(const String &p_alert, const String &p_title) {
  
  	Platform::String ^ alert = ref new Platform::String(p_alert.c_str());
  	Platform::String ^ title = ref new Platform::String(p_title.c_str());
  
  	MessageDialog ^ msg = ref new MessageDialog(alert, title);
  
  	UICommand ^ close = ref new UICommand("Close", ref new UICommandInvokedHandler(managed_object, &OS_UWP::ManagedType::alert_close));
  	msg->Commands->Append(close);
  	msg->DefaultCommandIndex = 0;
  
  	managed_object->alert_close_handle = true;
  
  	msg->ShowAsync();
  }
  
  void OS_UWP::ManagedType::alert_close(IUICommand ^ command) {
  
  	alert_close_handle = false;
  }
  
  void OS_UWP::ManagedType::on_clipboard_changed(Platform::Object ^ sender, Platform::Object ^ ev) {
  
  	update_clipboard();
  }
  
  void OS_UWP::ManagedType::update_clipboard() {
  
  	DataPackageView ^ data = Clipboard::GetContent();
  
  	if (data->Contains(StandardDataFormats::Text)) {
  
  		create_task(data->GetTextAsync()).then([this](Platform::String ^ clipboard_content) {
  			this->clipboard = clipboard_content;
  		});
  	}
  }
  
  void OS_UWP::ManagedType::on_accelerometer_reading_changed(Accelerometer ^ sender, AccelerometerReadingChangedEventArgs ^ args) {
  
  	AccelerometerReading ^ reading = args->Reading;
  
  	os->input->set_accelerometer(Vector3(
  			reading->AccelerationX,
  			reading->AccelerationY,
  			reading->AccelerationZ));
  }
  
  void OS_UWP::ManagedType::on_magnetometer_reading_changed(Magnetometer ^ sender, MagnetometerReadingChangedEventArgs ^ args) {
  
  	MagnetometerReading ^ reading = args->Reading;
  
  	os->input->set_magnetometer(Vector3(
  			reading->MagneticFieldX,
  			reading->MagneticFieldY,
  			reading->MagneticFieldZ));
  }
  
  void OS_UWP::ManagedType::on_gyroscope_reading_changed(Gyrometer ^ sender, GyrometerReadingChangedEventArgs ^ args) {
  
  	GyrometerReading ^ reading = args->Reading;
  
  	os->input->set_magnetometer(Vector3(
  			reading->AngularVelocityX,
  			reading->AngularVelocityY,
  			reading->AngularVelocityZ));
  }
  
  void OS_UWP::set_mouse_mode(MouseMode p_mode) {
  
  	if (p_mode == MouseMode::MOUSE_MODE_CAPTURED) {
  
  		CoreWindow::GetForCurrentThread()->SetPointerCapture();
  
  	} else {
  
  		CoreWindow::GetForCurrentThread()->ReleasePointerCapture();
  	}
  
  	if (p_mode == MouseMode::MOUSE_MODE_CAPTURED || p_mode == MouseMode::MOUSE_MODE_HIDDEN) {
  
  		CoreWindow::GetForCurrentThread()->PointerCursor = nullptr;
  
  	} else {
  
  		CoreWindow::GetForCurrentThread()->PointerCursor = ref new CoreCursor(CoreCursorType::Arrow, 0);
  	}
  
  	mouse_mode = p_mode;
  
  	SetEvent(mouse_mode_changed);
  }
  
  OS_UWP::MouseMode OS_UWP::get_mouse_mode() const {
  
  	return mouse_mode;
  }
  
  Point2 OS_UWP::get_mouse_position() const {
  
  	return Point2(old_x, old_y);
  }
  
  int OS_UWP::get_mouse_button_state() const {
  
  	return last_button_state;
  }
  
  void OS_UWP::set_window_title(const String &p_title) {
  }
  
  void OS_UWP::set_video_mode(const VideoMode &p_video_mode, int p_screen) {
  
  	video_mode = p_video_mode;
  }
  OS::VideoMode OS_UWP::get_video_mode(int p_screen) const {
  
  	return video_mode;
  }
  void OS_UWP::get_fullscreen_mode_list(List<VideoMode> *p_list, int p_screen) const {
  }
  
  String OS_UWP::get_name() {
  
  	return "UWP";
  }
  
  OS::Date OS_UWP::get_date(bool utc) const {
  
  	SYSTEMTIME systemtime;
  	if (utc)
  		GetSystemTime(&systemtime);
  	else
  		GetLocalTime(&systemtime);
  
  	Date date;
  	date.day = systemtime.wDay;
  	date.month = Month(systemtime.wMonth);
  	date.weekday = Weekday(systemtime.wDayOfWeek);
  	date.year = systemtime.wYear;
  	date.dst = false;
  	return date;
  }
  OS::Time OS_UWP::get_time(bool utc) const {
  
  	SYSTEMTIME systemtime;
  	if (utc)
  		GetSystemTime(&systemtime);
  	else
  		GetLocalTime(&systemtime);
  
  	Time time;
  	time.hour = systemtime.wHour;
  	time.min = systemtime.wMinute;
  	time.sec = systemtime.wSecond;
  	return time;
  }
  
  OS::TimeZoneInfo OS_UWP::get_time_zone_info() const {
  	TIME_ZONE_INFORMATION info;
  	bool daylight = false;
  	if (GetTimeZoneInformation(&info) == TIME_ZONE_ID_DAYLIGHT)
  		daylight = true;
  
  	TimeZoneInfo ret;
  	if (daylight) {
  		ret.name = info.DaylightName;
  	} else {
  		ret.name = info.StandardName;
  	}
  
  	// Bias value returned by GetTimeZoneInformation is inverted of what we expect
  	// For example on GMT-3 GetTimeZoneInformation return a Bias of 180, so invert the value to get -180
  	ret.bias = -info.Bias;
  	return ret;
  }
  
  uint64_t OS_UWP::get_unix_time() const {
  
  	FILETIME ft;
  	SYSTEMTIME st;
  	GetSystemTime(&st);
  	SystemTimeToFileTime(&st, &ft);
  
  	SYSTEMTIME ep;
  	ep.wYear = 1970;
  	ep.wMonth = 1;
  	ep.wDayOfWeek = 4;
  	ep.wDay = 1;
  	ep.wHour = 0;
  	ep.wMinute = 0;
  	ep.wSecond = 0;
  	ep.wMilliseconds = 0;
  	FILETIME fep;
  	SystemTimeToFileTime(&ep, &fep);
  
  	return (*(uint64_t *)&ft - *(uint64_t *)&fep) / 10000000;
  };
  
  void OS_UWP::delay_usec(uint32_t p_usec) const {
  
  	int msec = p_usec < 1000 ? 1 : p_usec / 1000;
  
  	// no Sleep()
  	WaitForSingleObjectEx(GetCurrentThread(), msec, false);
  }
  uint64_t OS_UWP::get_ticks_usec() const {
  
  	uint64_t ticks;
  	uint64_t time;
  	// This is the number of clock ticks since start
  	QueryPerformanceCounter((LARGE_INTEGER *)&ticks);
  	// Divide by frequency to get the time in seconds
  	time = ticks * 1000000L / ticks_per_second;
  	// Subtract the time at game start to get
  	// the time since the game started
  	time -= ticks_start;
  	return time;
  }
  
  void OS_UWP::process_events() {
  
  	joypad->process_controllers();
  	process_key_events();
  }
  
  void OS_UWP::process_key_events() {
  
  	for (int i = 0; i < key_event_pos; i++) {
  
  		KeyEvent &kev = key_event_buffer[i];
  
  		Ref<InputEventKey> key_event;
  		key_event.instance();
  		key_event->set_alt(kev.alt);
  		key_event->set_shift(kev.shift);
  		key_event->set_control(kev.control);
  		key_event->set_echo(kev.echo);
  		key_event->set_scancode(kev.scancode);
  		key_event->set_unicode(kev.unicode);
  		key_event->set_pressed(kev.pressed);
  
  		input_event(key_event);
  	}
  	key_event_pos = 0;
  }
  
  void OS_UWP::queue_key_event(KeyEvent &p_event) {
  	// This merges Char events with the previous Key event, so
  	// the unicode can be retrieved without sending duplicate events.
  	if (p_event.type == KeyEvent::MessageType::CHAR_EVENT_MESSAGE && key_event_pos > 0) {
  
  		KeyEvent &old = key_event_buffer[key_event_pos - 1];
  		ERR_FAIL_COND(old.type != KeyEvent::MessageType::KEY_EVENT_MESSAGE);
  
  		key_event_buffer[key_event_pos - 1].unicode = p_event.unicode;
  		return;
  	}
  
  	ERR_FAIL_COND(key_event_pos >= KEY_EVENT_BUFFER_SIZE);
  
  	key_event_buffer[key_event_pos++] = p_event;
  }
  
  void OS_UWP::set_cursor_shape(CursorShape p_shape) {
  
  	ERR_FAIL_INDEX(p_shape, CURSOR_MAX);
  
  	if (cursor_shape == p_shape)
  		return;
  
  	static const CoreCursorType uwp_cursors[CURSOR_MAX] = {
  		CoreCursorType::Arrow,
  		CoreCursorType::IBeam,
  		CoreCursorType::Hand,
  		CoreCursorType::Cross,
  		CoreCursorType::Wait,
  		CoreCursorType::Wait,
  		CoreCursorType::Arrow,
  		CoreCursorType::Arrow,
  		CoreCursorType::UniversalNo,
  		CoreCursorType::SizeNorthSouth,
  		CoreCursorType::SizeWestEast,
  		CoreCursorType::SizeNortheastSouthwest,
  		CoreCursorType::SizeNorthwestSoutheast,
  		CoreCursorType::SizeAll,
  		CoreCursorType::SizeNorthSouth,
  		CoreCursorType::SizeWestEast,
  		CoreCursorType::Help
  	};
  
  	CoreWindow::GetForCurrentThread()->PointerCursor = ref new CoreCursor(uwp_cursors[p_shape], 0);
  
  	cursor_shape = p_shape;
  }
  
  OS::CursorShape OS_UWP::get_cursor_shape() const {
  
  	return cursor_shape;
  }
  
  void OS_UWP::set_custom_mouse_cursor(const RES &p_cursor, CursorShape p_shape, const Vector2 &p_hotspot) {
  	// TODO
  }
  
  Error OS_UWP::execute(const String &p_path, const List<String> &p_arguments, bool p_blocking, ProcessID *r_child_id, String *r_pipe, int *r_exitcode, bool read_stderr) {
  
  	return FAILED;
  };
  
  Error OS_UWP::kill(const ProcessID &p_pid) {
  
  	return FAILED;
  };
  
  Error OS_UWP::set_cwd(const String &p_cwd) {
  
  	return FAILED;
  }
  
  String OS_UWP::get_executable_path() const {
  
  	return "";
  }
  
  void OS_UWP::set_icon(const Ref<Image> &p_icon) {
  }
  
  bool OS_UWP::has_environment(const String &p_var) const {
  
  	return false;
  };
  
  String OS_UWP::get_environment(const String &p_var) const {
  
  	return "";
  };
  
  bool OS_UWP::set_environment(const String &p_var, const String &p_value) const {
  
  	return false;
  }
  
  String OS_UWP::get_stdin_string(bool p_block) {
  
  	return String();
  }
  
  void OS_UWP::move_window_to_foreground() {
  }
  
  Error OS_UWP::shell_open(String p_uri) {
  
  	return FAILED;
  }
  
  String OS_UWP::get_locale() const {
  
  #if WINAPI_FAMILY == WINAPI_FAMILY_PHONE_APP // this should work on phone 8.1, but it doesn't
  	return "en";
  #else
  	Platform::String ^ language = Windows::Globalization::Language::CurrentInputMethodLanguageTag;
  	return String(language->Data()).replace("-", "_");
  #endif
  }
  
  void OS_UWP::release_rendering_thread() {
  
  	gl_context->release_current();
  }
  
  void OS_UWP::make_rendering_thread() {
  
  	gl_context->make_current();
  }
  
  void OS_UWP::swap_buffers() {
  
  	gl_context->swap_buffers();
  }
  
  bool OS_UWP::has_touchscreen_ui_hint() const {
  
  	TouchCapabilities ^ tc = ref new TouchCapabilities();
  	return tc->TouchPresent != 0 || UIViewSettings::GetForCurrentView()->UserInteractionMode == UserInteractionMode::Touch;
  }
  
  bool OS_UWP::has_virtual_keyboard() const {
  
  	return UIViewSettings::GetForCurrentView()->UserInteractionMode == UserInteractionMode::Touch;
  }
  
  void OS_UWP::show_virtual_keyboard(const String &p_existing_text, const Rect2 &p_screen_rect) {
  
  	InputPane ^ pane = InputPane::GetForCurrentView();
  	pane->TryShow();
  }
  
  void OS_UWP::hide_virtual_keyboard() {
  
  	InputPane ^ pane = InputPane::GetForCurrentView();
  	pane->TryHide();
  }
  
  static String format_error_message(DWORD id) {
  
  	LPWSTR messageBuffer = NULL;
  	size_t size = FormatMessageW(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM | FORMAT_MESSAGE_IGNORE_INSERTS,
  			NULL, id, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT), (LPWSTR)&messageBuffer, 0, NULL);
  
  	String msg = "Error " + itos(id) + ": " + String(messageBuffer, size);
  
  	LocalFree(messageBuffer);
  
  	return msg;
  }
  
  Error OS_UWP::open_dynamic_library(const String p_path, void *&p_library_handle, bool p_also_set_library_path) {
  
  	String full_path = "game/" + p_path;
  	p_library_handle = (void *)LoadPackagedLibrary(full_path.c_str(), 0);
  
  	if (!p_library_handle) {
  		ERR_EXPLAIN("Can't open dynamic library: " + full_path + ". Error: " + format_error_message(GetLastError()));
  		ERR_FAIL_V(ERR_CANT_OPEN);
  	}
  	return OK;
  }
  
  Error OS_UWP::close_dynamic_library(void *p_library_handle) {
  	if (!FreeLibrary((HMODULE)p_library_handle)) {
  		return FAILED;
  	}
  	return OK;
  }
  
  Error OS_UWP::get_dynamic_library_symbol_handle(void *p_library_handle, const String p_name, void *&p_symbol_handle, bool p_optional) {
  	p_symbol_handle = (void *)GetProcAddress((HMODULE)p_library_handle, p_name.utf8().get_data());
  	if (!p_symbol_handle) {
  		if (!p_optional) {
  			ERR_EXPLAIN("Can't resolve symbol " + p_name + ". Error: " + String::num(GetLastError()));
  			ERR_FAIL_V(ERR_CANT_RESOLVE);
  		} else {
  			return ERR_CANT_RESOLVE;
  		}
  	}
  	return OK;
  }
  
  void OS_UWP::run() {
  
  	if (!main_loop)
  		return;
  
  	main_loop->init();
  
  	uint64_t last_ticks = get_ticks_usec();
  
  	int frames = 0;
  	uint64_t frame = 0;
  
  	while (!force_quit) {
  
  		CoreWindow::GetForCurrentThread()->Dispatcher->ProcessEvents(CoreProcessEventsOption::ProcessAllIfPresent);
  		if (managed_object->alert_close_handle) continue;
  		process_events(); // get rid of pending events
  		if (Main::iteration())
  			break;
  	};
  
  	main_loop->finish();
  }
  
  MainLoop *OS_UWP::get_main_loop() const {
  
  	return main_loop;
  }
  
  String OS_UWP::get_user_data_dir() const {
  
  	Windows::Storage::StorageFolder ^ data_folder = Windows::Storage::ApplicationData::Current->LocalFolder;
  
  	return String(data_folder->Path->Data()).replace("\\", "/");
  }
  
  bool OS_UWP::_check_internal_feature_support(const String &p_feature) {
  	return p_feature == "pc";
  }
  
  OS::PowerState OS_UWP::get_power_state() {
  	return power_manager->get_power_state();
  }
  
  int OS_UWP::get_power_seconds_left() {
  	return power_manager->get_power_seconds_left();
  }
  
  int OS_UWP::get_power_percent_left() {
  	return power_manager->get_power_percent_left();
  }
  
  OS_UWP::OS_UWP() {
  
  	key_event_pos = 0;
  	force_quit = false;
  	alt_mem = false;
  	gr_mem = false;
  	shift_mem = false;
  	control_mem = false;
  	meta_mem = false;
  	minimized = false;
  
  	pressrc = 0;
  	old_invalid = true;
  	mouse_mode = MOUSE_MODE_VISIBLE;
  #ifdef STDOUT_FILE
  	stdo = fopen("stdout.txt", "wb");
  #endif
  
  	gl_context = NULL;
  
  	display_request = ref new Windows::System::Display::DisplayRequest();
  
  	managed_object = ref new ManagedType;
  	managed_object->os = this;
  
  	mouse_mode_changed = CreateEvent(NULL, TRUE, FALSE, L"os_mouse_mode_changed");
  
  	AudioDriverManager::add_driver(&audio_driver);
  
  	Vector<Logger *> loggers;
  	loggers.push_back(memnew(WindowsTerminalLogger));
  	_set_logger(memnew(CompositeLogger(loggers)));
  }
  
  OS_UWP::~OS_UWP() {
  #ifdef STDOUT_FILE
  	fclose(stdo);
  #endif
  }
  