--- /dev/null
+/*
+Copyright (C) 2003, 2010 - Wolfire Games
+Copyright (C) 2010-2016 - Lugaru contributors (see AUTHORS file)
+
+This file is part of Lugaru.
+
+Lugaru is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 2 of the License, or
+(at your option) any later version.
+
+Lugaru is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with Lugaru. If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifdef _WIN32
+
+#include "Platform/Platform.hpp"
+
+#include <errno.h>
+#include <stdio.h>
+#include <time.h>
+#include <windows.h>
+
+class AppTime
+{
+ public:
+ AppTime()
+ {
+ counterRate = 1;
+ baseCounter = 0;
+ QueryPerformanceFrequency((LARGE_INTEGER*)&counterRate);
+ QueryPerformanceCounter((LARGE_INTEGER*)&baseCounter);
+ }
+ __int64 counterRate; // LARGE_INTEGER type has no math functions so use int64
+ __int64 baseCounter;
+};
+static AppTime g_appTime;
+
+AbsoluteTime UpTime()
+{
+ __int64 counter;
+ QueryPerformanceCounter((LARGE_INTEGER*)&counter);
+
+ counter -= g_appTime.baseCounter;
+
+ AbsoluteTime time;
+ time.lo = (unsigned long)counter;
+ time.hi = (unsigned long)(counter >> 32);
+ return time;
+}
+
+Duration AbsoluteDeltaToDuration(AbsoluteTime& a, AbsoluteTime& b)
+{
+ __int64 value = a.hi;
+ value <<= 32;
+ value |= a.lo;
+ __int64 value2 = b.hi;
+ value2 <<= 32;
+ value2 |= b.lo;
+ value -= value2;
+
+ if (value <= 0)
+ return durationImmediate;
+
+ __int64 frac = value % g_appTime.counterRate;
+ value /= g_appTime.counterRate;
+
+ Duration time;
+
+ if (value == 0) {
+ frac *= -1000000;
+ frac /= g_appTime.counterRate;
+ time = (Duration)frac;
+ } else {
+ frac *= 1000;
+ frac /= g_appTime.counterRate;
+ value *= 1000;
+ value += frac;
+ time = (Duration)value;
+ }
+
+ return time;
+}
+
+#endif // _WIN32