/***********************************************************************************
 *                                                                                 *
 * Voreen - The Volume Rendering Engine                                            *
 *                                                                                 *
 * Copyright (C) 2005-2012 University of Muenster, Germany.                        *
 * Visualization and Computer Graphics Group <http://viscg.uni-muenster.de>        *
 * For a list of authors please refer to the file "CREDITS.txt".                   *
 *                                                                                 *
 * This file is part of the Voreen software package. Voreen is free software:      *
 * you can redistribute it and/or modify it under the terms of the GNU General     *
 * Public License version 2 as published by the Free Software Foundation.          *
 *                                                                                 *
 * Voreen 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 General Public License for more details.      *
 *                                                                                 *
 * You should have received a copy of the GNU General Public License in the file   *
 * "LICENSE.txt" along with this file. If not, see <http://www.gnu.org/licenses/>. *
 *                                                                                 *
 * For non-commercial academic use see the license exception specified in the file *
 * "LICENSE-academic.txt". To get information about commercial licensing please    *
 * contact the authors.                                                            *
 *                                                                                 *
 ***********************************************************************************/

#include "tgt/stopwatch.h"
#include "tgt/assert.h"

namespace tgt {

Stopwatch::Stopwatch() {
    reset();
}

uint64_t Stopwatch::getTicks() {

    #ifdef WIN32
        return GetTickCount();
    #else
        struct timeval tp;
        int result = gettimeofday(&tp, 0);
        if (!result)
            return static_cast<uint64_t>( (static_cast<uint64_t>(tp.tv_sec) ) * 1000 + (tp.tv_usec / 1000));
        else {
            tgtAssert(false, "The system function gettimeofday returned an error code!");
            return 0;
        }
    #endif
}

clock_t Stopwatch::getRuntime() {
    if (!isStopped_)
        return (static_cast<clock_t>(getTicks()) - startTime_) + runTime_;
    else
        return runTime_;
}

void Stopwatch::stop() {
    if (!isStopped_) {
        isStopped_ = true;
        runTime_ += static_cast<clock_t>(getTicks()) - startTime_;
    }
}

void Stopwatch::start() {
    if (isStopped_) {
        startTime_ = static_cast<clock_t>(getTicks());
        isStopped_ = false;
    }
}


void Stopwatch::reset() {
    isStopped_ = true;
    startTime_ = 0;
    runTime_   = 0;
}

} // namespace
