timer.cpp

shrike is a utility application that acts as a testbed for shaders written in Sh

// Sh: A GPU metaprogramming language.
//
// Copyright 2003-2005 Serious Hack Inc.
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, 
// MA  02110-1301, USA
//////////////////////////////////////////////////////////////////////////////
#include "Timer.hpp"

#ifdef WIN32
ShTimer::ShTimer(void)
{
  t.QuadPart = 0;
}

ShTimer::~ShTimer(void)
{
}

float ShTimer::value(void)
{
  LARGE_INTEGER freq;
  QueryPerformanceFrequency(&freq);
  return ((float)t.QuadPart)/((float)freq.QuadPart/1000.0);
}

ShTimer ShTimer::now(void)
{
  ShTimer ret;
  QueryPerformanceCounter(&ret.t);
  return ret;
}

ShTimer ShTimer::zero(void)
{
  ShTimer ret;
  ret.t.QuadPart = 0;
  return ret;
}

ShTimer operator-(const ShTimer& a, const ShTimer& b)
{
  ShTimer ret;
  ret.t.QuadPart = a.t.QuadPart + b.t.QuadPart;
  return ret;
}

ShTimer operator+(const ShTimer& a, const ShTimer& b)
{
  ShTimer ret;
  ret.t.QuadPart = a.t.QuadPart - b.t.QuadPart;
  return ret;
}

#else

ShTimer::ShTimer(void)
{
  t.tv_sec = 0;
  t.tv_usec = 0;
}

ShTimer::~ShTimer(void)
{
}

float ShTimer::value(void)
{
  float sec = (float)t.tv_sec*1000;
  float msec = (float)t.tv_usec/1000;
  return (sec + msec);
}

ShTimer ShTimer::now(void)
{
  ShTimer ret;
  gettimeofday(&ret.t, 0);
  return ret;
}

ShTimer ShTimer::zero(void)
{
  ShTimer ret;
  ret.t.tv_sec = 0;
  ret.t.tv_usec = 0;
  return ret;
}

ShTimer operator-(const ShTimer& a, const ShTimer& b)
{
  ShTimer ret;
  
  ret.t.tv_sec = a.t.tv_sec - b.t.tv_sec;
  ret.t.tv_usec = a.t.tv_usec - b.t.tv_usec;

  // adjust microsecond if the value is out of range
  if (ret.t.tv_usec < 0) {
    ret.t.tv_sec -= 1;
    ret.t.tv_usec += 1000000;
  }

  // adjust microsecond if the value is out of range
  if (ret.t.tv_usec > 1000000) {
    ret.t.tv_sec += 1;
    ret.t.tv_usec -= 1000000;
  }

  return ret;
}

ShTimer operator+(const ShTimer& a, const ShTimer& b)
{
  ShTimer ret;
  
  ret.t.tv_sec = a.t.tv_sec + b.t.tv_sec;
  ret.t.tv_usec = a.t.tv_usec + b.t.tv_usec;

  // adjust microsecond if the value is out of range
  if (ret.t.tv_usec < 0) {
    ret.t.tv_sec -= 1;
    ret.t.tv_usec += 1000000;
  }
  
  // adjust microsecond if the value is out of range
  if (ret.t.tv_usec > 1000000) {
    ret.t.tv_sec += 1;
    ret.t.tv_usec -= 1000000;
  }
  
  return ret;
}
#endif /* WIN32 */