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// Copyright (C) 2018 Klaralvdalens Datakonsult AB (KDAB).
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR LGPL-3.0-only OR GPL-2.0-only OR GPL-3.0-only
#include "qsetfence.h"
#include "qsetfence_p.h"
QT_BEGIN_NAMESPACE
namespace Qt3DRender {
QSetFencePrivate::QSetFencePrivate()
: QFrameGraphNodePrivate()
, m_handleType(QSetFence::NoHandle)
, m_handle(QVariant())
{
}
/*!
\class Qt3DRender::QSetFence
\inmodule Qt3DRender
\brief FrameGraphNode used to insert a fence in the graphics command stream.
Fence allow to synchronosize GPU and CPU workloads. GPU commands usually
are non-blocking. When issued, commands are inserted in command buffers
which will be read at a later time by the GPU. In some cases, you want to
continue processing or issue specific command only when you are sure a
command has been executed by the hardware. Fences are a way to do so. This
is especially important when using 3rd party engines with Qt3D, Qt3D should
only access shared resources when we know the other engine command are done
modifying the resource.
QSetFence is a FrameGraph node that inserts a fence into the command
stream. It can then be used in conjunction with \l QWaitFence or by
extracting the underlying handle.
The handle property will be updated once the renderer has created the
underlying fence resource. The handle will remain valid as long as it
remains in the unsignaled state. Once it has reached the signaled state, it
will be destroyed and a new handle will be created. That means that
depending on how long it takes for the fence to be signaled, the same
handle could be used over several frames.
\since 5.13
*/
QSetFence::QSetFence(Qt3DCore::QNode *parent)
: QFrameGraphNode(*new QSetFencePrivate(), parent)
{
}
QSetFence::~QSetFence()
{
}
QSetFence::QSetFence(QSetFencePrivate &dd, Qt3DCore::QNode *parent)
: QFrameGraphNode(dd, parent)
{
}
/*!
\qmlproperty HandleType SetFence::handleType
Specifies the type of handle being used. Currently only OpenGL Fence ids
are supported.
*/
/*!
\property Qt3DRender::QSetFence::handleType
Specifies the type of handle being used. Currently only OpenGL Fence ids
are supported.
*/
QSetFence::HandleType QSetFence::handleType() const
{
Q_D(const QSetFence);
return d->m_handleType;
}
void QSetFencePrivate::setHandleType(QSetFence::HandleType type)
{
Q_Q(QSetFence);
if (m_handleType != type) {
const bool blocked = q->blockNotifications(true);
m_handleType = type;
emit q->handleTypeChanged(type);
q->blockNotifications(blocked);
}
}
/*!
\qmlproperty variant SetFence::handle
Holds the underlying fence handle wrapped in a variant.
*/
/*!
\property Qt3DRender::QSetFence::handle
Holds the underlying fence handle wrapped in a QVariant.
*/
QVariant QSetFence::handle() const
{
Q_D(const QSetFence);
return d->m_handle;
}
void QSetFencePrivate::setHandle(QVariant handle)
{
Q_Q(QSetFence);
if (m_handle != handle) {
const bool blocked = q->blockNotifications(true);
m_handle = handle;
emit q->handleChanged(handle);
q->blockNotifications(blocked);
}
}
} // Qt3DRender
QT_END_NAMESPACE
#include "moc_qsetfence.cpp"
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