timer.h

/*
Copyright (c) 2015, Dimitri Diakopoulos All rights reserved.

Redistribution and use in source and binary forms, with or without
modification, are permitted provided that the following conditions are met:

* Redistributions of source code must retain the above copyright notice, this
  list of conditions and the following disclaimer.

* Redistributions in binary form must reproduce the above copyright notice,
  this list of conditions and the following disclaimer in the documentation
  and/or other materials provided with the distribution.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/

#ifndef HIGH_RESOLUTION_TIMER_H
#define HIGH_RESOLUTION_TIMER_H

#if defined(MM_PLATFORM_WINDOWS)

#define WIN32_LEAN_AND_MEAN
#include <windows.h>

class PlatformTimer
{
    LARGE_INTEGER start_timestamp;
    LARGE_INTEGER stop_timestamp;
    LARGE_INTEGER timer_frequency;
public:
    PlatformTimer()
    {
        start_timestamp.QuadPart = 0;
        stop_timestamp.QuadPart = 0;
    }
    
    virtual ~PlatformTimer() {}
    
    void start()
    {
        QueryPerformanceFrequency(&timer_frequency);
        QueryPerformanceCounter(&start_timestamp);
    }
    
    void stop()
    {
        QueryPerformanceCounter(&stop_timestamp);
    }
    
    double running_time_ms() const
    {
        LARGE_INTEGER tmp;
        QueryPerformanceCounter(&tmp);
        return (double) (tmp.QuadPart - start_timestamp.QuadPart) / timer_frequency.QuadPart * 1000;
    }
    
    double running_time_s() const
    {
        LARGE_INTEGER tmp;
        QueryPerformanceCounter(&tmp);
        return (double) (tmp.QuadPart - start_timestamp.QuadPart) / timer_frequency.QuadPart;
    }
    
    double diff_ms() const
    {
        return (double)(stop_timestamp.QuadPart - start_timestamp.QuadPart) / timer_frequency.QuadPart * 1000;
    }
};

#elif defined(MM_PLATFORM_OSX)
#include <mach/mach_time.h>

class PlatformTimer
{
    uint64_t start_timestamp;
    uint64_t stop_timestamp;
    uint64_t timer_frequency;
public:
    PlatformTimer()
    {
        mach_timebase_info_data_t info;
        mach_timebase_info(&info);
        timer_frequency = (static_cast<double>(info.numer)) / (static_cast<double>(info.denom));
    }
    
    virtual ~PlatformTimer() {}
    
    void start()
    {
        start_timestamp = mach_absolute_time();
    }
    
    void stop()
    {
         stop_timestamp = mach_absolute_time();
    }
    
    double running_time_ms() const
    {
        uint64_t current_time = mach_absolute_time();
        return (double)(current_time - start_timestamp) * timer_frequency * 1e-6;
    }
    
    double running_time_s() const
    {
        uint64_t current_time = mach_absolute_time();
        return (double)(current_time - start_timestamp) * timer_frequency * 1e-9;
    }
    
    double diff_ms() const
    {
        return static_cast<double>(stop_timestamp - start_timestamp) * timer_frequency * 1e-6;
    }
};

#else
    #error Unimplemented timer for desired platform
#endif

#endif