| 1 | // Copyright (C) 2015 Paul Lemire |
|---|---|
| 2 | // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only |
| 3 | |
| 4 | #include "vsyncframeadvanceservice_p.h" |
| 5 | #include <Qt3DRender/private/renderlogging_p.h> |
| 6 | #include <Qt3DCore/private/qabstractframeadvanceservice_p.h> |
| 7 | #include <Qt3DCore/private/qabstractframeadvanceservice_p_p.h> |
| 8 | #include <QSemaphore> |
| 9 | #include <QElapsedTimer> |
| 10 | |
| 11 | QT_BEGIN_NAMESPACE |
| 12 | |
| 13 | namespace Qt3DRender { |
| 14 | namespace Render { |
| 15 | |
| 16 | class VSyncFrameAdvanceServicePrivate final : public Qt3DCore::QAbstractFrameAdvanceServicePrivate |
| 17 | { |
| 18 | public: |
| 19 | explicit VSyncFrameAdvanceServicePrivate(bool drivenByRenderThread) |
| 20 | : QAbstractFrameAdvanceServicePrivate(QStringLiteral("Renderer Aspect Frame Advance Service - aligned with vsync")) |
| 21 | , m_semaphore(0) |
| 22 | , m_elapsedTimeSincePreviousFrame(0) |
| 23 | , m_drivenByRenderThread(drivenByRenderThread) |
| 24 | { |
| 25 | } |
| 26 | |
| 27 | QSemaphore m_semaphore; |
| 28 | QElapsedTimer m_elapsed; |
| 29 | qint64 m_elapsedTimeSincePreviousFrame; |
| 30 | bool m_drivenByRenderThread; |
| 31 | }; |
| 32 | |
| 33 | VSyncFrameAdvanceService::VSyncFrameAdvanceService(bool drivenByRenderThread) |
| 34 | : QAbstractFrameAdvanceService(*new VSyncFrameAdvanceServicePrivate(drivenByRenderThread)) |
| 35 | { |
| 36 | } |
| 37 | |
| 38 | VSyncFrameAdvanceService::~VSyncFrameAdvanceService() |
| 39 | { |
| 40 | } |
| 41 | |
| 42 | // Main Thread |
| 43 | qint64 VSyncFrameAdvanceService::waitForNextFrame() |
| 44 | { |
| 45 | Q_D(VSyncFrameAdvanceService); |
| 46 | |
| 47 | d->m_semaphore.acquire(n: std::max(a: d->m_semaphore.available(), b: 1)); |
| 48 | |
| 49 | const qint64 currentTime = d->m_elapsed.nsecsElapsed(); |
| 50 | qCDebug(VSyncAdvanceService) << "Elapsed nsecs since last call "<< currentTime - d->m_elapsedTimeSincePreviousFrame; |
| 51 | d->m_elapsedTimeSincePreviousFrame = currentTime; |
| 52 | return currentTime; |
| 53 | } |
| 54 | |
| 55 | void VSyncFrameAdvanceService::start() |
| 56 | { |
| 57 | Q_D(VSyncFrameAdvanceService); |
| 58 | d->m_elapsed.start(); |
| 59 | } |
| 60 | |
| 61 | /*! |
| 62 | \internal |
| 63 | |
| 64 | Stops the VSyncFrameAdvanceService, releases the semaphore to allow the |
| 65 | renderer to cleanup without having to call waitForNextFrame. |
| 66 | */ |
| 67 | void VSyncFrameAdvanceService::stop() |
| 68 | { |
| 69 | Q_D(VSyncFrameAdvanceService); |
| 70 | d->m_semaphore.release(n: 1); |
| 71 | qCDebug(VSyncAdvanceService) << "Terminating VSyncFrameAdvanceService"; |
| 72 | } |
| 73 | |
| 74 | // Render Thread |
| 75 | void VSyncFrameAdvanceService::proceedToNextFrame() |
| 76 | { |
| 77 | Q_D(VSyncFrameAdvanceService); |
| 78 | d->m_semaphore.release(n: 1); |
| 79 | } |
| 80 | |
| 81 | } // namespace Render |
| 82 | } // namespace Qt3DRender |
| 83 | |
| 84 | QT_END_NAMESPACE |
| 85 |