92 lines
2.1 KiB
C++
92 lines
2.1 KiB
C++
/*
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Copyright (C) 2003, 2010 - Wolfire Games
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Copyright (C) 2010-2017 - Lugaru contributors (see AUTHORS file)
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This file is part of Lugaru.
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Lugaru is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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Lugaru is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with Lugaru. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifdef _WIN32
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#include "Platform/Platform.hpp"
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#include <errno.h>
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#include <stdio.h>
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#include <time.h>
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#include <windows.h>
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class AppTime
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{
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public:
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AppTime()
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{
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counterRate = 1;
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baseCounter = 0;
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QueryPerformanceFrequency((LARGE_INTEGER*)&counterRate);
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QueryPerformanceCounter((LARGE_INTEGER*)&baseCounter);
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}
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__int64 counterRate; // LARGE_INTEGER type has no math functions so use int64
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__int64 baseCounter;
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};
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static AppTime g_appTime;
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AbsoluteTime UpTime()
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{
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__int64 counter;
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QueryPerformanceCounter((LARGE_INTEGER*)&counter);
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counter -= g_appTime.baseCounter;
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AbsoluteTime time;
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time.lo = (unsigned long)counter;
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time.hi = (unsigned long)(counter >> 32);
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return time;
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}
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Duration AbsoluteDeltaToDuration(AbsoluteTime& a, AbsoluteTime& b)
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{
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__int64 value = a.hi;
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value <<= 32;
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value |= a.lo;
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__int64 value2 = b.hi;
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value2 <<= 32;
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value2 |= b.lo;
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value -= value2;
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if (value <= 0)
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return durationImmediate;
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__int64 frac = value % g_appTime.counterRate;
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value /= g_appTime.counterRate;
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Duration time;
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if (value == 0) {
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frac *= -1000000;
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frac /= g_appTime.counterRate;
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time = (Duration)frac;
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} else {
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frac *= 1000;
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frac /= g_appTime.counterRate;
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value *= 1000;
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value += frac;
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time = (Duration)value;
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}
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return time;
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}
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#endif // _WIN32
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