src/video/winrt/SDL_winrtevents.cpp
author David Ludwig
Tue, 27 Aug 2013 21:21:09 -0400
changeset 8505 a76a3842c9eb
parent 8494 5d165785918d
child 8515 bc6cf9201dab
permissions -rw-r--r--
WinRT: experimental and preliminary support for XAML-based overlays on Windows 8/RT

The XAML support here is still rudimentary. Bugs do exist. You've been warned.

XAML support in Windows Phone 8 is not yet available (in SDL/WinRT).
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/*
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  Simple DirectMedia Layer
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  Copyright (C) 1997-2012 Sam Lantinga <slouken@libsdl.org>
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  This software is provided 'as-is', without any express or implied
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  warranty.  In no event will the authors be held liable for any damages
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  arising from the use of this software.
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  Permission is granted to anyone to use this software for any purpose,
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  including commercial applications, and to alter it and redistribute it
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  freely, subject to the following restrictions:
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  1. The origin of this software must not be misrepresented; you must not
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     claim that you wrote the original software. If you use this software
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     in a product, an acknowledgment in the product documentation would be
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     appreciated but is not required.
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  2. Altered source versions must be plainly marked as such, and must not be
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     misrepresented as being the original software.
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  3. This notice may not be removed or altered from any source distribution.
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*/
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#include "SDL_config.h"
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#if SDL_VIDEO_DRIVER_WINRT
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/* SDL includes */
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#include "SDL_winrtevents_c.h"
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#include "../../core/winrt/SDL_winrtapp.h"
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#include "SDL_assert.h"
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#include "SDL_system.h"
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extern "C" {
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#include "../SDL_sysvideo.h"
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#include "../../events/SDL_events_c.h"
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}
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/* Forward declarations and globals */
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extern SDL_WinRTApp ^ SDL_WinRTGlobalApp;
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extern int (*WINRT_XAMLAppMainFunction)(int, char **);
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extern void WINRT_YieldXAMLThread();
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/* Global event management */
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void
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WINRT_PumpEvents(_THIS)
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{
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    if (SDL_WinRTGlobalApp) {
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        SDL_WinRTGlobalApp->PumpEvents();
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    } else if (WINRT_XAMLAppMainFunction) {
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        WINRT_YieldXAMLThread();
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    }
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}
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/* XAML Thread management */
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enum SDL_XAMLAppThreadState
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{
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    ThreadState_NotLaunched = 0,
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    ThreadState_Running,
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    ThreadState_Yielding
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};
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static SDL_XAMLAppThreadState _threadState = ThreadState_NotLaunched;
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static SDL_Thread * _XAMLThread = nullptr;
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static SDL_mutex * _mutex = nullptr;
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static SDL_cond * _cond = nullptr;
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static void
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WINRT_YieldXAMLThread()
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{
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    SDL_LockMutex(_mutex);
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    SDL_assert(_threadState == ThreadState_Running);
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    _threadState = ThreadState_Yielding;
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    SDL_UnlockMutex(_mutex);
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    SDL_CondSignal(_cond);
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    SDL_LockMutex(_mutex);
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    while (_threadState != ThreadState_Running) {
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        SDL_CondWait(_cond, _mutex);
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    }
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    SDL_UnlockMutex(_mutex);
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}
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static int
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WINRT_XAMLThreadMain(void * userdata)
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{
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    return WINRT_XAMLAppMainFunction(0, NULL);
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}
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void
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WINRT_CycleXAMLThread()
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{
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    switch (_threadState) {
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        case ThreadState_NotLaunched:
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        {
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            _cond = SDL_CreateCond();
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            _mutex = SDL_CreateMutex();
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            _threadState = ThreadState_Running;
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            _XAMLThread = SDL_CreateThread(WINRT_XAMLThreadMain, "SDL/XAML App Thread", nullptr);
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            SDL_LockMutex(_mutex);
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            while (_threadState != ThreadState_Yielding) {
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                SDL_CondWait(_cond, _mutex);
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            }
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            SDL_UnlockMutex(_mutex);
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            break;
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        }
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        case ThreadState_Running:
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        {
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            SDL_assert(false);
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            break;
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        }
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        case ThreadState_Yielding:
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        {
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            SDL_LockMutex(_mutex);
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            SDL_assert(_threadState == ThreadState_Yielding);
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            _threadState = ThreadState_Running;
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            SDL_UnlockMutex(_mutex);
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            SDL_CondSignal(_cond);
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            SDL_LockMutex(_mutex);
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            while (_threadState != ThreadState_Yielding) {
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                SDL_CondWait(_cond, _mutex);
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            }
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            SDL_UnlockMutex(_mutex);
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        }
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    }
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}
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#endif /* SDL_VIDEO_DRIVER_WINRT */
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/* vi: set ts=4 sw=4 expandtab: */