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/*
Copyright (C) 2003, 2010 - Wolfire Games
Copyright (C) 2010-2017 - 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
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