/*

   Simple DirectMedia Layer

   Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>

   This software is provided 'as-is', without any express or implied

   warranty.  In no event will the authors be held liable for any damages

   arising from the use of this software.

   Permission is granted to anyone to use this software for any purpose,

   including commercial applications, and to alter it and redistribute it

   freely, subject to the following restrictions:

   1. The origin of this software must not be misrepresented; you must not

      claim that you wrote the original software. If you use this software

      in a product, an acknowledgment in the product documentation would be

      appreciated but is not required.

   2. Altered source versions must be plainly marked as such, and must not be

      misrepresented as being the original software.

   3. This notice may not be removed or altered from any source distribution.

 */

 #include "SDL_config.h"

 #if SDL_VIDEO_DRIVER_WINRT

 /*

  * Windows includes:

  */

 #include <Windows.h>

 using namespace Windows::UI::Core;

 using Windows::UI::Core::CoreCursor;

 /*

  * SDL includes:

  */

 #include "SDL_winrtevents_c.h"

 #include "../../core/winrt/SDL_winrtapp_direct3d.h"

 #include "../../core/winrt/SDL_winrtapp_xaml.h"

 #include "SDL_assert.h"

 #include "SDL_system.h"

 extern "C" {

 #include "../SDL_sysvideo.h"

 #include "../../events/SDL_events_c.h"

 }

 /* Forward declarations */

 static void WINRT_YieldXAMLThread();

 /* Global event management */

 void

 WINRT_PumpEvents(_THIS)

 {

     if (SDL_WinRTGlobalApp) {

         SDL_WinRTGlobalApp->PumpEvents();

     } else if (WINRT_XAMLAppMainFunction) {

         WINRT_YieldXAMLThread();

     }

 }

 /* XAML Thread management */

 enum SDL_XAMLAppThreadState

 {

     ThreadState_NotLaunched = 0,

     ThreadState_Running,

     ThreadState_Yielding

 };

 static SDL_XAMLAppThreadState _threadState = ThreadState_NotLaunched;

 static SDL_Thread * _XAMLThread = nullptr;

 static SDL_mutex * _mutex = nullptr;

 static SDL_cond * _cond = nullptr;

 static void

 WINRT_YieldXAMLThread()

 {

     SDL_LockMutex(_mutex);

     SDL_assert(_threadState == ThreadState_Running);

     _threadState = ThreadState_Yielding;

     SDL_UnlockMutex(_mutex);

     SDL_CondSignal(_cond);

     SDL_LockMutex(_mutex);

     while (_threadState != ThreadState_Running) {

         SDL_CondWait(_cond, _mutex);

     }

     SDL_UnlockMutex(_mutex);

 }

 static int

 WINRT_XAMLThreadMain(void * userdata)

 {

     return WINRT_XAMLAppMainFunction(0, NULL);

 }

 void

 WINRT_CycleXAMLThread()

 {

     switch (_threadState) {

         case ThreadState_NotLaunched:

         {

             _cond = SDL_CreateCond();

             _mutex = SDL_CreateMutex();

             _threadState = ThreadState_Running;

             _XAMLThread = SDL_CreateThread(WINRT_XAMLThreadMain, "SDL/XAML App Thread", nullptr);

             SDL_LockMutex(_mutex);

             while (_threadState != ThreadState_Yielding) {

                 SDL_CondWait(_cond, _mutex);

             }

             SDL_UnlockMutex(_mutex);

             break;

         }

         case ThreadState_Running:

         {

             SDL_assert(false);

             break;

         }

         case ThreadState_Yielding:

         {

             SDL_LockMutex(_mutex);

             SDL_assert(_threadState == ThreadState_Yielding);

             _threadState = ThreadState_Running;

             SDL_UnlockMutex(_mutex);

             SDL_CondSignal(_cond);

             SDL_LockMutex(_mutex);

             while (_threadState != ThreadState_Yielding) {

                 SDL_CondWait(_cond, _mutex);

             }

             SDL_UnlockMutex(_mutex);

         }

     }

 }

 #endif /* SDL_VIDEO_DRIVER_WINRT */

 /* vi: set ts=4 sw=4 expandtab: */