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76 lines
2.3 KiB
C++
76 lines
2.3 KiB
C++
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//-----------------------------------------------------------------------------
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// Product: OpenCTM tools
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// File: systimer.cpp
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// Description: Implementation of the system timer routines.
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//-----------------------------------------------------------------------------
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// Copyright (c) 2009-2010 Marcus Geelnard
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//
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// This software is provided 'as-is', without any express or implied
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// warranty. In no event will the authors be held liable for any damages
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// arising from the use of this software.
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//
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// Permission is granted to anyone to use this software for any purpose,
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// including commercial applications, and to alter it and redistribute it
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// freely, subject to the following restrictions:
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//
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// 1. The origin of this software must not be misrepresented; you must not
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// claim that you wrote the original software. If you use this software
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// in a product, an acknowledgment in the product documentation would be
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// appreciated but is not required.
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//
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// 2. Altered source versions must be plainly marked as such, and must not
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// be misrepresented as being the original software.
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//
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// 3. This notice may not be removed or altered from any source
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// distribution.
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//-----------------------------------------------------------------------------
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#include "systimer.h"
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using namespace std;
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/// Constructor
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SysTimer::SysTimer()
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{
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#ifdef WIN32
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if(QueryPerformanceFrequency((LARGE_INTEGER *)&mTimeFreq))
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QueryPerformanceCounter((LARGE_INTEGER *)&mTimeStart);
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else
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mTimeFreq = 0;
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#else
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struct timeval tv;
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gettimeofday(&tv, 0);
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mTimeStart = (long long) tv.tv_sec * (long long) 1000000 + (long long) tv.tv_usec;
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#endif
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}
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/// Get current time.
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double SysTimer::GetTime()
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{
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#ifdef WIN32
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__int64 t;
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QueryPerformanceCounter((LARGE_INTEGER *)&t);
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return double(t - mTimeStart) / double(mTimeFreq);
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#else
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struct timeval tv;
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gettimeofday(&tv, 0);
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long long t = (long long) tv.tv_sec * (long long) 1000000 + (long long) tv.tv_usec;
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return (1e-6) * double(t - mTimeStart);
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#endif
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}
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/// Push current time (start measuring).
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void SysTimer::Push()
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{
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mStack.push_back(GetTime());
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}
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/// Pop delta time since last push.
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double SysTimer::PopDelta()
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{
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double delta = GetTime() - mStack.back();
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mStack.pop_back();
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return delta;
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}
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