SDL2: use native SDL2 Timer API for windows

src/sdl/i_system.c

@@ -1954,70 +1954,6 @@ FUNCMATH ticcmd_t *I_BaseTiccmd2(void)
 	return &emptycmd2;
 }
 
-#if defined (_WIN32)
-static HMODULE winmm = NULL;
-static DWORD starttickcount = 0; // hack for win2k time bug
-static p_timeGetTime pfntimeGetTime = NULL;
-
-// ---------
-// I_GetTime
-// Use the High Resolution Timer if available,
-// else use the multimedia timer which has 1 millisecond precision on Windowz 95,
-// but lower precision on Windows NT
-// ---------
-
-tic_t I_GetTime(void)
-{
-	tic_t newtics = 0;
-
-	if (!starttickcount) // high precision timer
-	{
-		LARGE_INTEGER currtime; // use only LowPart if high resolution counter is not available
-		static LARGE_INTEGER basetime = {{0, 0}};
-
-		// use this if High Resolution timer is found
-		static LARGE_INTEGER frequency;
-
-		if (!basetime.LowPart)
-		{
-			if (!QueryPerformanceFrequency(&frequency))
-				frequency.QuadPart = 0;
-			else
-				QueryPerformanceCounter(&basetime);
-		}
-
-		if (frequency.LowPart && QueryPerformanceCounter(&currtime))
-		{
-			newtics = (INT32)((currtime.QuadPart - basetime.QuadPart) * NEWTICRATE
-				/ frequency.QuadPart);
-		}
-		else if (pfntimeGetTime)
-		{
-			currtime.LowPart = pfntimeGetTime();
-			if (!basetime.LowPart)
-				basetime.LowPart = currtime.LowPart;
-			newtics = ((currtime.LowPart - basetime.LowPart)/(1000/NEWTICRATE));
-		}
-	}
-	else
-		newtics = (GetTickCount() - starttickcount)/(1000/NEWTICRATE);
-
-	return newtics;
-}
-
-static void I_ShutdownTimer(void)
-{
-	pfntimeGetTime = NULL;
-	if (winmm)
-	{
-		p_timeEndPeriod pfntimeEndPeriod = (p_timeEndPeriod)GetProcAddress(winmm, "timeEndPeriod");
-		if (pfntimeEndPeriod)
-			pfntimeEndPeriod(1);
-		FreeLibrary(winmm);
-		winmm = NULL;
-	}
-}
-#else
 //
 // I_GetTime
 // returns time in 1/TICRATE second tics
@@ -2038,30 +1974,12 @@ tic_t I_GetTime (void)
 
 	return (tic_t)ticks;
 }
-#endif
 
 //
 //I_StartupTimer
 //
 FUNCMATH void I_StartupTimer(void)
 {
-#ifdef _WIN32
-	// for win2k time bug
-	if (M_CheckParm("-gettickcount"))
-	{
-		starttickcount = GetTickCount();
-		CONS_Printf("%s", M_GetText("Using GetTickCount()\n"));
-	}
-	winmm = LoadLibraryA("winmm.dll");
-	if (winmm)
-	{
-		p_timeEndPeriod pfntimeBeginPeriod = (p_timeEndPeriod)GetProcAddress(winmm, "timeBeginPeriod");
-		if (pfntimeBeginPeriod)
-			pfntimeBeginPeriod(1);
-		pfntimeGetTime = (p_timeGetTime)GetProcAddress(winmm, "timeGetTime");
-	}
-	I_AddExitFunc(I_ShutdownTimer);
-#endif
 }