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/*
* Copyright 2009, Google Inc.
* 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.
* * Neither the name of Google Inc. nor the names of its
* contributors may be used to endorse or promote products derived from
* this software without specific prior written permission.
*
* 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
* OWNER 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.
*/
// This file contains the definitions of Timer related classes
#include <build/build_config.h>
#ifdef OS_LINUX
#include <sys/time.h>
#include <time.h>
#endif
#include "core/cross/timer.h"
namespace o3d {
#ifdef OS_LINUX
static uint64_t GetCurrentTime() {
struct timeval tv;
gettimeofday(&tv, NULL);
return tv.tv_sec*1000000ULL + tv.tv_usec;
}
#endif
ElapsedTimeTimer::ElapsedTimeTimer() {
#if defined(OS_WIN)
// Get the frequency of the windows performance clock.
QueryPerformanceFrequency(&windows_timer_frequency_);
// Initialize the last_time_ value with the current time.
QueryPerformanceCounter(&last_time_);
#endif
#if defined(OS_MACOSX)
last_time_ = UpTime();
#endif
#if defined(OS_LINUX)
last_time_ = GetCurrentTime();
#endif
}
float ElapsedTimeTimer::GetElapsedTimeHelper(bool reset) {
float elapsedTime = 0.0f;
// Get current performance timer value.
TimeStamp current_time;
#ifdef OS_WIN
QueryPerformanceCounter(¤t_time);
// Compute elapsed time since the last call.
elapsedTime = static_cast<float>(
static_cast<double>(current_time.QuadPart - last_time_.QuadPart) /
static_cast<double>(windows_timer_frequency_.QuadPart));
#endif
#ifdef OS_MACOSX
current_time = UpTime();
AbsoluteTime elapsed_ticks = SubAbsoluteFromAbsolute(current_time,
last_time_);
Nanoseconds elapsedInNanos = AbsoluteToNanoseconds(elapsed_ticks);
uint64 ns64 = UnsignedWideToUInt64(elapsedInNanos);
double elapsedInSeconds = static_cast<double>(ns64) * 0.000000001;
elapsedTime = elapsedInSeconds;
#endif
#ifdef OS_LINUX
current_time = GetCurrentTime();
elapsedTime = static_cast<float>((current_time - last_time_) * 1.e-6);
#endif
if (reset) {
// Save the current time for the next time we ask.
last_time_ = current_time;
}
return elapsedTime;
}
float ElapsedTimeTimer::GetElapsedTimeWithoutClearing() {
return GetElapsedTimeHelper(false);
}
float ElapsedTimeTimer::GetElapsedTimeAndReset() {
return GetElapsedTimeHelper(true);
}
} // namespace o3d
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