QMemoryBarrier Class
(Qt3DRender::QMemoryBarrier)Class to emplace a memory barrier. More...
Header: | #include <QMemoryBarrier> |
qmake: | QT += 3drender |
Since: | Qt 5.9 |
Instantiated By: | MemoryBarrier |
Inherits: | Qt3DRender::QFrameGraphNode |
This class was introduced in Qt 5.9.
Public Types
enum | Operation { None, ElementArray, Uniform, TextureFetch, ..., All } |
flags | Operations |
Related Non-Members
typedef | QNodePtr |
typedef | QNodeVector |
typedef | QObjectList |
QList<T> | qFindChildren(const QObject *obj, const QRegExp ®Exp) |
Qt3DCore::QNodeId | qIdForNode(Qt3DCore::QNode *node) |
Qt3DCore::QNodeIdVector | qIdsForNodes(const T &nodes) |
T | qobject_cast(QObject *object) |
T | qobject_cast(const QObject *object) |
Macros
QT_NO_NARROWING_CONVERSIONS_IN_CONNECT | |
Q_CLASSINFO(Name, Value) | |
Q_DISABLE_COPY(Class) | |
Q_DISABLE_COPY_MOVE(Class) | |
Q_DISABLE_MOVE(Class) | |
Q_EMIT | |
Q_ENUM(...) | |
Q_ENUM_NS(...) | |
Q_FLAG(...) | |
Q_FLAG_NS(...) | |
Q_GADGET | |
Q_INTERFACES(...) | |
Q_INVOKABLE | |
Q_NAMESPACE | |
Q_OBJECT | |
Q_PROPERTY(...) | |
Q_REVISION | |
Q_SET_OBJECT_NAME(Object) | |
Q_SIGNAL | |
Q_SIGNALS | |
Q_SLOT | |
Q_SLOTS |
Additional Inherited Members
- 3 properties inherited from Qt3DCore::QNode
- 1 property inherited from QObject
- 1 public function inherited from Qt3DRender::QFrameGraphNode
- 13 public functions inherited from Qt3DCore::QNode
- 30 public functions inherited from QObject
- 3 public slots inherited from Qt3DCore::QNode
- 1 public slot inherited from QObject
- 4 signals inherited from Qt3DCore::QNode
- 2 signals inherited from QObject
- 9 static public members inherited from QObject
- 2 protected functions inherited from Qt3DCore::QNode
- 9 protected functions inherited from QObject
Detailed Description
A Qt3DRender::QMemoryBarrier FrameGraph node is used to emplace a specific memory barrier at a specific time of the rendering. This is required to properly synchronize drawing and compute commands on the GPU.
The barrier defines the ordering of memory operations issued by a prior command. This means that if command1 is manipulating a buffer that is to be used as a vertex attribute buffer in a following command2, then the memory barrier should be placed after command1 and setting the appropriate barrier type for vertex attribute buffer.
When a QMemoryBarrier node is found in a FrameGraph branch, the barrier will be enforced prior to any draw or compute command even if these are defined deeper in the branch.
For OpenGL rendering, this page gives more info about the Memory Model
Member Type Documentation
enum QMemoryBarrier::Operation
flags QMemoryBarrier::Operations
This enum type describes types of buffer to be cleared.
Constant | Value |
---|---|
Qt3DRender::QMemoryBarrier::None | 0 |
Qt3DRender::QMemoryBarrier::ElementArray | (1 << 1) |
Qt3DRender::QMemoryBarrier::Uniform | (1 << 2) |
Qt3DRender::QMemoryBarrier::TextureFetch | (1 << 3) |
Qt3DRender::QMemoryBarrier::ShaderImageAccess | (1 << 4) |
Qt3DRender::QMemoryBarrier::Command | (1 << 5) |
Qt3DRender::QMemoryBarrier::PixelBuffer | (1 << 6) |
Qt3DRender::QMemoryBarrier::TextureUpdate | (1 << 7) |
Qt3DRender::QMemoryBarrier::BufferUpdate | (1 << 8) |
Qt3DRender::QMemoryBarrier::FrameBuffer | (1 << 9) |
Qt3DRender::QMemoryBarrier::TransformFeedback | (1 << 10) |
Qt3DRender::QMemoryBarrier::AtomicCounter | (1 << 11) |
Qt3DRender::QMemoryBarrier::ShaderStorage | (1 << 12) |
Qt3DRender::QMemoryBarrier::QueryBuffer | (1 << 13) |
Qt3DRender::QMemoryBarrier::VertexAttributeArray | (1 << 0) |
Qt3DRender::QMemoryBarrier::All | 0xFFFFFFFF |
The Operations type is a typedef for QFlags<Operation>. It stores an OR combination of Operation values.