sources/android/ndk_helper/perfMonitor.h

/*
 * 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.
 */

#pragma once

#include <jni.h>
#include <errno.h>
#include <time.h>
#include "JNIHelper.h"

namespace ndk_helper
{

const int32_t NUM_SAMPLES = 100;

/******************************************************************
 * Helper class for a performance monitoring and get current tick time
 */
class PerfMonitor
{
private:
    float current_FPS_;
    time_t tv_last_sec_;

    double last_tick_;
    int32_t tickindex_;
    double ticksum_;
    double ticklist_[NUM_SAMPLES];

    double UpdateTick( double current_tick );
public:
    PerfMonitor();
    virtual ~PerfMonitor();

    bool Update( float &fFPS );

    static double GetCurrentTime()
    {
        struct timeval time;
        gettimeofday( &time, NULL );
        double ret = time.tv_sec + time.tv_usec * 1.0 / 1000000.0;
        return ret;
    }
};

}   //namespace ndkHelper