| /**************************************************************************** |
| ** |
| ** Copyright (C) 2015 Paul Lemire |
| ** Contact: https://www.qt.io/licensing/ |
| ** |
| ** This file is part of the Qt3D module of the Qt Toolkit. |
| ** |
| ** $QT_BEGIN_LICENSE:LGPL$ |
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| ** GNU General Public License Usage |
| ** Alternatively, this file may be used under the terms of the GNU |
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| ** Public license version 3 or any later version approved by the KDE Free |
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| ****************************************************************************/ |
| |
| #include "vsyncframeadvanceservice_p.h" |
| #include <Qt3DRender/private/renderlogging_p.h> |
| #include <Qt3DCore/private/qabstractframeadvanceservice_p.h> |
| #include <Qt3DCore/private/qabstractframeadvanceservice_p_p.h> |
| #include <QSemaphore> |
| #include <QElapsedTimer> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace Qt3DRender { |
| namespace Render { |
| |
| class VSyncFrameAdvanceServicePrivate final : public Qt3DCore::QAbstractFrameAdvanceServicePrivate |
| { |
| public: |
| explicit VSyncFrameAdvanceServicePrivate(bool drivenByRenderThread) |
| : QAbstractFrameAdvanceServicePrivate(QStringLiteral("Renderer Aspect Frame Advance Service - aligned with vsync")) |
| , m_semaphore(0) |
| , m_elapsedTimeSincePreviousFrame(0) |
| , m_drivenByRenderThread(drivenByRenderThread) |
| { |
| } |
| |
| QSemaphore m_semaphore; |
| QElapsedTimer m_elapsed; |
| qint64 m_elapsedTimeSincePreviousFrame; |
| bool m_drivenByRenderThread; |
| }; |
| |
| VSyncFrameAdvanceService::VSyncFrameAdvanceService(bool drivenByRenderThread) |
| : QAbstractFrameAdvanceService(*new VSyncFrameAdvanceServicePrivate(drivenByRenderThread)) |
| { |
| } |
| |
| VSyncFrameAdvanceService::~VSyncFrameAdvanceService() |
| { |
| } |
| |
| // Main Thread |
| qint64 VSyncFrameAdvanceService::waitForNextFrame() |
| { |
| Q_D(VSyncFrameAdvanceService); |
| |
| d->m_semaphore.acquire(std::max(d->m_semaphore.available(), 1)); |
| |
| const qint64 currentTime = d->m_elapsed.nsecsElapsed(); |
| qCDebug(VSyncAdvanceService) << "Elapsed nsecs since last call " << currentTime - d->m_elapsedTimeSincePreviousFrame; |
| d->m_elapsedTimeSincePreviousFrame = currentTime; |
| return currentTime; |
| } |
| |
| void VSyncFrameAdvanceService::start() |
| { |
| Q_D(VSyncFrameAdvanceService); |
| d->m_elapsed.start(); |
| } |
| |
| /*! |
| \internal |
| |
| Stops the VSyncFrameAdvanceService, releases the semaphore to allow the |
| renderer to cleanup without having to call waitForNextFrame. |
| */ |
| void VSyncFrameAdvanceService::stop() |
| { |
| Q_D(VSyncFrameAdvanceService); |
| d->m_semaphore.release(1); |
| qCDebug(VSyncAdvanceService) << "Terminating VSyncFrameAdvanceService"; |
| } |
| |
| // Render Thread |
| void VSyncFrameAdvanceService::proceedToNextFrame() |
| { |
| Q_D(VSyncFrameAdvanceService); |
| d->m_semaphore.release(1); |
| } |
| |
| } // namespace Render |
| } // namespace Qt3DRender |
| |
| QT_END_NAMESPACE |