Timer.cpp

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/* Copyright (c) 2014-2017, ARM Limited and Contributors
 *
 * SPDX-License-Identifier: MIT
 *
 * Permission is hereby granted, free of charge,
 * to any person obtaining a copy of this software and associated documentation files (the "Software"),
 * to deal in the Software without restriction, including without limitation the rights to
 * use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software,
 * and to permit persons to whom the Software is furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
 * INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
 * IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 */

#include "Timer.h"

#if defined(_WIN32)

#include <cstdio>
#include <windows.h>

namespace MaliSDK
{
    Timer::Timer()
    {
        LARGE_INTEGER l;

        QueryPerformanceFrequency(&l);

        fps           = 0.0f;
        frameCount    = 0;
        invFreq       = 1.0f / l.QuadPart;
        lastFpsUpdate = 0.0f;
        lastInterval  = 0.0f;
        lastTime      = 0.0f;

        reset();
    }

    void Timer::reset()
    {
        LARGE_INTEGER l;

        QueryPerformanceCounter(&l);

        resetStamp = (((double)l.QuadPart) * invFreq);
    }

    float Timer::getTime()
    {
        LARGE_INTEGER l;

        QueryPerformanceCounter(&l);

        return (float)(((double)l.QuadPart) * invFreq - resetStamp);
    }
}
#else

#include <sys/time.h>

namespace MaliSDK
{
    Timer::Timer()
        : startTime()
        , currentTime()
        , lastIntervalTime(0.0f)
        , frameCount(0)
        , fpsTime(0.0f)
        , fps(0.0f)
    {    
        startTime.tv_sec    = 0;
        startTime.tv_usec   = 0;
        currentTime.tv_sec  = 0;
        currentTime.tv_usec = 0;

        reset();
    }

    void Timer::reset()
    {
        gettimeofday(&startTime, NULL);

        lastIntervalTime = 0.0;

        frameCount = 0;
        fpsTime    = 0.0f;
    }

    float Timer::getTime()
    {
        gettimeofday(&currentTime, NULL);

        float seconds      = (currentTime.tv_sec - startTime.tv_sec);
        float milliseconds = (float(currentTime.tv_usec - startTime.tv_usec)) / 1000000.0f;

        return seconds + milliseconds;
    }
}
#endif