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/*
* Copyright 2013 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
#include "perfMonitor.h"
namespace ndk_helper
{
PerfMonitor::PerfMonitor() :
last_tick_( 0.f ),
tv_last_sec_( 0 ),
tickindex_( 0 ),
ticksum_( 0 )
{
for( int32_t i = 0; i < NUM_SAMPLES; ++i )
ticklist_[i] = 0;
}
PerfMonitor::~PerfMonitor()
{
}
double PerfMonitor::UpdateTick( double currentTick )
{
ticksum_ -= ticklist_[tickindex_];
ticksum_ += currentTick;
ticklist_[tickindex_] = currentTick;
tickindex_ = (tickindex_ + 1) % NUM_SAMPLES;
return ((double) ticksum_ / NUM_SAMPLES);
}
bool PerfMonitor::Update( float &fFPS )
{
struct timeval Time;
gettimeofday( &Time, NULL );
double time = Time.tv_sec + Time.tv_usec * 1.0 / 1000000.0;
double tick = time - last_tick_;
double d = UpdateTick( tick );
last_tick_ = time;
if( Time.tv_sec - tv_last_sec_ >= 1 )
{
double time = Time.tv_sec + Time.tv_usec * 1.0 / 1000000.0;
current_FPS_ = 1.f / d;
tv_last_sec_ = Time.tv_sec;
fFPS = current_FPS_;
return true;
}
else
{
fFPS = current_FPS_;
return false;
}
}
} //namespace ndkHelper
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