58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
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/********************************************************************
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KWin - the KDE window manager
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This file is part of the KDE project.
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Copyright (C) 2006 Lubos Lunak <l.lunak@kde.org>
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Copyright (C) 2009, 2010, 2011 Martin Gräßlin <mgraesslin@kde.org>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*********************************************************************/
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#include "swap_profiler.h"
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#include <logging.h>
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namespace KWin
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{
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SwapProfiler::SwapProfiler()
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{
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init();
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}
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void SwapProfiler::init()
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{
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m_time = 2 * 1000*1000; // we start with a long time mean of 2ms ...
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m_counter = 0;
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}
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void SwapProfiler::begin()
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{
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m_timer.start();
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}
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char SwapProfiler::end()
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{
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// .. and blend in actual values.
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// this way we prevent extremes from killing our long time mean
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m_time = (10*m_time + m_timer.nsecsElapsed())/11;
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if (++m_counter > 500) {
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const bool blocks = m_time > 1000 * 1000; // 1ms, i get ~250µs and ~7ms w/o triple buffering...
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qCDebug(KWIN_OPENGL) << "Triple buffering detection:" << QString(blocks ? QStringLiteral("NOT available") : QStringLiteral("Available")) <<
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" - Mean block time:" << m_time/(1000.0*1000.0) << "ms";
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return blocks ? 'd' : 't';
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}
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return 0;
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}
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}
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