WinRT: build fixes and additional WinRT-related integrations with SDL 2.0.0

src/timer/windows/SDL_systimer.c

@@ -41,6 +41,7 @@ static LARGE_INTEGER hires_start_ticks;
 static LARGE_INTEGER hires_ticks_per_second;
 #endif
 
+#ifndef __WINRT__
 static void
 timeSetPeriod(UINT uPeriod)
 {
@@ -74,6 +75,7 @@ SDL_TimerResolutionChanged(void *userdata, const char *name, const char *oldValu
         timeSetPeriod(uPeriod);
     }
 }
+#endif /* ifndef __WINRT__ */
 
 void
 SDL_StartTicks(void)
@@ -90,13 +92,19 @@ SDL_StartTicks(void)
         QueryPerformanceCounter(&hires_start_ticks);
     } else {
         hires_timer_available = FALSE;
+#ifdef __WINRT__
+        start = 0;            /* the timer failed to start! */
+#else
         timeSetPeriod(1);     /* use 1 ms timer precision */
         start = timeGetTime();
+#endif /* ifdef __WINRT__ */
     }
 #endif
 
+#ifndef __WINRT__
     SDL_AddHintCallback(SDL_HINT_TIMER_RESOLUTION,
                         SDL_TimerResolutionChanged, NULL);
+#endif
 }
 
 Uint32
@@ -119,7 +127,11 @@ SDL_GetTicks(void)
 
         return (DWORD) hires_now.QuadPart;
     } else {
+#ifdef __WINRT__
+        now = 0;
+#else
         now = timeGetTime();
+#endif // ifdef __WINRT__
     }
 #endif
 
@@ -148,6 +160,19 @@ SDL_GetPerformanceFrequency(void)
     return frequency.QuadPart;
 }
 
+#ifdef __WINRT__
+static void
+Sleep(DWORD timeout)
+{
+    static HANDLE mutex = 0;
+    if ( ! mutex )
+    {
+        mutex = CreateEventEx(0, 0, 0, EVENT_ALL_ACCESS);
+    }
+    WaitForSingleObjectEx(mutex, timeout, FALSE);
+}
+#endif
+
 void
 SDL_Delay(Uint32 ms)
 {