qt-everywhere-src-5.15.1/qtquick3d/src/render/qssgrendersync.cpp

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#include <QtQuick3DRender/private/qssgrendercontext_p.h>
#include <QtQuick3DRender/private/qssgrendersync_p.h>
#include <QtQuick3DRender/private/qssgrenderbasetypes_p.h>

QT_BEGIN_NAMESPACE

QSSGRenderSync::QSSGRenderSync(const QSSGRef<QSSGRenderContext> &context)
    : m_backend(context->backend()), m_handle(nullptr)
{
}

QSSGRenderSync::~QSSGRenderSync()
{
    if (m_handle)
        m_backend->releaseSync(m_handle);
}

void QSSGRenderSync::sync()
{
    // On every sync call we need to create a new sync object
    // A sync object can only be used once

    // First delete the old object
    // We can safely do this because it is actually not deleted until
    // it is unused
    if (m_handle)
        m_backend->releaseSync(m_handle);

    m_handle = m_backend->createSync(QSSGRenderSyncType::GpuCommandsComplete, QSSGRenderSyncFlags());
}

void QSSGRenderSync::wait()
{
    // wait until the sync object is signaled or a timeout happens
    if (m_handle)
        m_backend->waitSync(m_handle, QSSGRenderCommandFlushFlags(), 0);
}

QSSGRef<QSSGRenderSync> QSSGRenderSync::create(const QSSGRef<QSSGRenderContext> &context)
{
    if (!context->supportsCommandSync())
        return nullptr;

    return QSSGRef<QSSGRenderSync>(new QSSGRenderSync(context));
}

QT_END_NAMESPACE