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SDL_winrtevents.cpp (3939B)

      1 /*
      2   Simple DirectMedia Layer
      3   Copyright (C) 1997-2020 Sam Lantinga <slouken@libsdl.org>
      4 
      5   This software is provided 'as-is', without any express or implied
      6   warranty.  In no event will the authors be held liable for any damages
      7   arising from the use of this software.
      8 
      9   Permission is granted to anyone to use this software for any purpose,
     10   including commercial applications, and to alter it and redistribute it
     11   freely, subject to the following restrictions:
     12 
     13   1. The origin of this software must not be misrepresented; you must not
     14      claim that you wrote the original software. If you use this software
     15      in a product, an acknowledgment in the product documentation would be
     16      appreciated but is not required.
     17   2. Altered source versions must be plainly marked as such, and must not be
     18      misrepresented as being the original software.
     19   3. This notice may not be removed or altered from any source distribution.
     20 */
     21 #include "../../SDL_internal.h"
     22 
     23 #if SDL_VIDEO_DRIVER_WINRT
     24 
     25 /*
     26  * Windows includes:
     27  */
     28 #include <Windows.h>
     29 using namespace Windows::UI::Core;
     30 using Windows::UI::Core::CoreCursor;
     31 
     32 /*
     33  * SDL includes:
     34  */
     35 #include "SDL_winrtevents_c.h"
     36 #include "../../core/winrt/SDL_winrtapp_common.h"
     37 #include "../../core/winrt/SDL_winrtapp_direct3d.h"
     38 #include "../../core/winrt/SDL_winrtapp_xaml.h"
     39 #include "SDL_system.h"
     40 
     41 extern "C" {
     42 #include "../../thread/SDL_systhread.h"
     43 #include "../SDL_sysvideo.h"
     44 #include "../../events/SDL_events_c.h"
     45 }
     46 
     47 
     48 /* Forward declarations */
     49 static void WINRT_YieldXAMLThread();
     50 
     51 
     52 /* Global event management */
     53 
     54 void
     55 WINRT_PumpEvents(_THIS)
     56 {
     57     if (SDL_WinRTGlobalApp) {
     58         SDL_WinRTGlobalApp->PumpEvents();
     59     } else if (WINRT_XAMLWasEnabled) {
     60         WINRT_YieldXAMLThread();
     61     }
     62 }
     63 
     64 
     65 /* XAML Thread management */
     66 
     67 enum SDL_XAMLAppThreadState
     68 {
     69     ThreadState_NotLaunched = 0,
     70     ThreadState_Running,
     71     ThreadState_Yielding
     72 };
     73 
     74 static SDL_XAMLAppThreadState _threadState = ThreadState_NotLaunched;
     75 static SDL_Thread * _XAMLThread = nullptr;
     76 static SDL_mutex * _mutex = nullptr;
     77 static SDL_cond * _cond = nullptr;
     78 
     79 static void
     80 WINRT_YieldXAMLThread()
     81 {
     82     SDL_LockMutex(_mutex);
     83     SDL_assert(_threadState == ThreadState_Running);
     84     _threadState = ThreadState_Yielding;
     85     SDL_UnlockMutex(_mutex);
     86 
     87     SDL_CondSignal(_cond);
     88 
     89     SDL_LockMutex(_mutex);
     90     while (_threadState != ThreadState_Running) {
     91         SDL_CondWait(_cond, _mutex);
     92     }
     93     SDL_UnlockMutex(_mutex);
     94 }
     95 
     96 static int
     97 WINRT_XAMLThreadMain(void * userdata)
     98 {
     99     // TODO, WinRT: pass the C-style main() a reasonably realistic
    100     // representation of command line arguments.
    101     int argc = 0;
    102     char **argv = NULL;
    103     return WINRT_SDLAppEntryPoint(argc, argv);
    104 }
    105 
    106 void
    107 WINRT_CycleXAMLThread(void)
    108 {
    109     switch (_threadState) {
    110         case ThreadState_NotLaunched:
    111         {
    112             _cond = SDL_CreateCond();
    113 
    114             _mutex = SDL_CreateMutex();
    115             _threadState = ThreadState_Running;
    116             _XAMLThread = SDL_CreateThreadInternal(WINRT_XAMLThreadMain, "SDL/XAML App Thread", 0, nullptr);
    117 
    118             SDL_LockMutex(_mutex);
    119             while (_threadState != ThreadState_Yielding) {
    120                 SDL_CondWait(_cond, _mutex);
    121             }
    122             SDL_UnlockMutex(_mutex);
    123 
    124             break;
    125         }
    126 
    127         case ThreadState_Running:
    128         {
    129             SDL_assert(false);
    130             break;
    131         }
    132 
    133         case ThreadState_Yielding:
    134         {
    135             SDL_LockMutex(_mutex);
    136             SDL_assert(_threadState == ThreadState_Yielding);
    137             _threadState = ThreadState_Running;
    138             SDL_UnlockMutex(_mutex);
    139 
    140             SDL_CondSignal(_cond);
    141 
    142             SDL_LockMutex(_mutex);
    143             while (_threadState != ThreadState_Yielding) {
    144                 SDL_CondWait(_cond, _mutex);
    145             }
    146             SDL_UnlockMutex(_mutex);
    147         }
    148     }
    149 }
    150 
    151 #endif /* SDL_VIDEO_DRIVER_WINRT */
    152 
    153 /* vi: set ts=4 sw=4 expandtab: */