126 lines
2.9 KiB
C++
126 lines
2.9 KiB
C++
// MIT License
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// Copyright (c) 2019 Erin Catto
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// Permission is hereby granted, free of charge, to any person obtaining a copy
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// of this software and associated documentation files (the "Software"), to deal
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// in the Software without restriction, including without limitation the rights
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// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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// copies of the Software, and to permit persons to whom the Software is
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// furnished to do so, subject to the following conditions:
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// The above copyright notice and this permission notice shall be included in all
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// copies or substantial portions of the Software.
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// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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// SOFTWARE.
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#include "box2d/b2_timer.h"
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#if defined(_WIN32)
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double b2Timer::s_invFrequency = 0.0;
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#ifndef WIN32_LEAN_AND_MEAN
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#define WIN32_LEAN_AND_MEAN
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#endif
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#include <windows.h>
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b2Timer::b2Timer()
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{
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LARGE_INTEGER largeInteger;
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if (s_invFrequency == 0.0)
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{
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QueryPerformanceFrequency(&largeInteger);
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s_invFrequency = double(largeInteger.QuadPart);
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if (s_invFrequency > 0.0)
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{
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s_invFrequency = 1000.0 / s_invFrequency;
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}
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}
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QueryPerformanceCounter(&largeInteger);
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m_start = double(largeInteger.QuadPart);
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}
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void b2Timer::Reset()
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{
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LARGE_INTEGER largeInteger;
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QueryPerformanceCounter(&largeInteger);
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m_start = double(largeInteger.QuadPart);
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}
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float b2Timer::GetMilliseconds() const
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{
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LARGE_INTEGER largeInteger;
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QueryPerformanceCounter(&largeInteger);
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double count = double(largeInteger.QuadPart);
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float ms = float(s_invFrequency * (count - m_start));
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return ms;
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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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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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timeval t;
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gettimeofday(&t, 0);
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m_start_sec = t.tv_sec;
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m_start_usec = t.tv_usec;
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}
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float b2Timer::GetMilliseconds() const
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{
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timeval t;
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gettimeofday(&t, 0);
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time_t start_sec = m_start_sec;
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suseconds_t start_usec = m_start_usec;
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// http://www.gnu.org/software/libc/manual/html_node/Elapsed-Time.html
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if (t.tv_usec < start_usec)
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{
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int nsec = (start_usec - t.tv_usec) / 1000000 + 1;
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start_usec -= 1000000 * nsec;
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start_sec += nsec;
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}
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if (t.tv_usec - start_usec > 1000000)
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{
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int nsec = (t.tv_usec - start_usec) / 1000000;
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start_usec += 1000000 * nsec;
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start_sec -= nsec;
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}
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return 1000.0f * (t.tv_sec - start_sec) + 0.001f * (t.tv_usec - start_usec);
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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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float 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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