viktorljung
135 lines
3.0 KiB
C++
135 lines
3.0 KiB
C++
/*
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* Copyright (c) 2011 Erin Catto http://box2d.org
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* Copyright (c) 2014 Google, Inc.
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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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* 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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* 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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* 2. Altered source versions must be plainly marked as such, and must not be
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* misrepresented as being the original software.
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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include <Box2D/Common/b2Timer.h>
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#if defined(_WIN32)
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float64 b2Timer::s_invFrequency = 0.0f;
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#define WIN32_LEAN_AND_MEAN
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#include <windows.h>
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typedef BOOL (WINAPI *SystemGetTimeFunc)(_Out_ LARGE_INTEGER *lpFrequency);
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SystemGetTimeFunc systemGetTimeFunc = ::QueryPerformanceCounter;
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SystemGetTimeFunc systemGetFreqFunc = ::QueryPerformanceFrequency;
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int64 b2Timer::GetTicks()
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{
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LARGE_INTEGER largeInteger;
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systemGetTimeFunc(&largeInteger);
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return largeInteger.QuadPart;
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}
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b2Timer::b2Timer()
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{
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LARGE_INTEGER largeInteger;
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if (s_invFrequency == 0.0f)
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{
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systemGetFreqFunc(&largeInteger);
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s_invFrequency = float64(largeInteger.QuadPart);
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if (s_invFrequency > 0.0f)
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{
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s_invFrequency = 1000.0f / s_invFrequency;
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}
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}
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m_start = GetTicks();
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}
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void b2Timer::Reset()
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{
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m_start = GetTicks();
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}
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float32 b2Timer::GetMilliseconds() const
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{
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int64 elapsed = GetTicks() - m_start;
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return (float32)(s_invFrequency * elapsed);
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}
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#elif defined(__linux__) || defined (__APPLE__)
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#include <sys/time.h>
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#include <time.h>
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// systemGetTimeFunc is defined with external linkage to allow unit
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// test to mock out the system time function
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#if defined(__linux__)
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typedef int (*SystemGetTimeFunc)(clockid_t clk_id, struct timespec *tp);
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SystemGetTimeFunc systemGetTimeFunc = ::clock_gettime;
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#elif defined(__APPLE__)
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typedef int (*SystemGetTimeFunc)(struct timeval * tp, void * tzp);
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SystemGetTimeFunc systemGetTimeFunc = ::gettimeofday;
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#endif
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int64 b2Timer::GetTicks()
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{
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static const int NSEC_PER_SEC = 1000000000;
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#ifdef __linux__
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timespec ts;
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systemGetTimeFunc(CLOCK_MONOTONIC,&ts);
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return ((int64)ts.tv_sec) * NSEC_PER_SEC + ts.tv_nsec;
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#else
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timeval t;
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systemGetTimeFunc(&t, 0);
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return ((int64)t.tv_sec) * NSEC_PER_SEC + t.tv_usec * 1000;
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#endif
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}
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b2Timer::b2Timer()
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{
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Reset();
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}
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void b2Timer::Reset()
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{
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m_start = GetTicks();
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}
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float32 b2Timer::GetMilliseconds() const
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{
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static const float32 kTicksToMs = 0.000001f;
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return kTicksToMs * (float32)(GetTicks() - m_start);
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}
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#else
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b2Timer::b2Timer()
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{
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}
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void b2Timer::Reset()
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{
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}
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float32 b2Timer::GetMilliseconds() const
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{
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return 0.0f;
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}
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#endif
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