Contents

QBlitFramebuffer Class

class Qt3DRender::QBlitFramebuffer

FrameGraph node to transfer a rectangle of pixel values from one region of a render target to another. More...

Header: #include <QBlitFramebuffer>
CMake: find_package(Qt6 REQUIRED COMPONENTS 3drender)
target_link_libraries(mytarget PRIVATE Qt6::3drender)
qmake: QT += 3drender
Instantiated By: BlitFramebuffer
Inherits: Qt3DRender::QFrameGraphNode

Public Types

enum InterpolationMethod { Nearest, Linear }

Properties

Public Functions

QBlitFramebuffer(Qt3DCore::QNode *parent = nullptr)
virtual ~QBlitFramebuffer()
Qt3DRender::QRenderTarget *destination() const
Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint() const
QRectF destinationRect() const
Qt3DRender::QBlitFramebuffer::InterpolationMethod interpolationMethod() const
void setDestination(Qt3DRender::QRenderTarget *destination)
void setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)
void setDestinationRect(const QRectF &outputRect)
void setInterpolationMethod(Qt3DRender::QBlitFramebuffer::InterpolationMethod interpolationMethod)
void setSource(Qt3DRender::QRenderTarget *source)
void setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)
void setSourceRect(const QRectF &inputRect)
Qt3DRender::QRenderTarget *source() const
Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint() const
QRectF sourceRect() const

Signals

void destinationAttachmentPointChanged()
void destinationChanged()
void destinationRectChanged()
void interpolationMethodChanged()
void sourceAttachmentPointChanged()
void sourceChanged()
void sourceRectChanged()

Detailed Description

This node inserts a glBlitFrameBuffer or an equivalent into the command stream. This provides a more efficient method for copying rectangles between textures or surface backbuffers wrapped by QRenderTarget than drawing textured quads. It also supports scaling with the specified interpolation method.

Note: In practice the QBlitFramebuffer node will often be used in combination with QNoDraw since a blit should not involve issuing draw calls for any entities.

Member Type Documentation

enum QBlitFramebuffer::InterpolationMethod

Specifies the interpolation applied if the image is stretched.

ConstantValueDescription
Qt3DRender::QBlitFramebuffer::Nearest0Nearest-neighbor interpolation.
Qt3DRender::QBlitFramebuffer::Linear1Linear interpolation.

Property Documentation

destination : Qt3DRender::QRenderTarget*

Specifies the destination render target. When not set, the destination is assumed to be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Access functions:

Qt3DRender::QRenderTarget *destination() const
void setDestination(Qt3DRender::QRenderTarget *destination)

Notifier signal:

void destinationChanged()

destinationAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint

Specifies the target attachment point.

Access functions:

Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint() const
void setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)

Notifier signal:

void destinationAttachmentPointChanged()

destinationRect : QRectF

Specifies the destination rectangle. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Access functions:

QRectF destinationRect() const
void setDestinationRect(const QRectF &outputRect)

Notifier signal:

void destinationRectChanged()

source : Qt3DRender::QRenderTarget*

Specifies the source render target. When not set, the source is assumed to be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Access functions:

Qt3DRender::QRenderTarget *source() const
void setSource(Qt3DRender::QRenderTarget *source)

Notifier signal:

void sourceChanged()

sourceAttachmentPoint : Qt3DRender::QRenderTargetOutput::AttachmentPoint

Specifies the source attachment point.

Access functions:

Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint() const
void setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)

Notifier signal:

void sourceAttachmentPointChanged()

sourceRect : QRectF

Specifies the source rectangle. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Access functions:

QRectF sourceRect() const
void setSourceRect(const QRectF &inputRect)

Notifier signal:

void sourceRectChanged()

Member Function Documentation

[explicit] QBlitFramebuffer::QBlitFramebuffer(Qt3DCore::QNode *parent = nullptr)

Constructs a new QBlitFramebuffer with the given parent.

[virtual noexcept] QBlitFramebuffer::~QBlitFramebuffer()

Destructor.

Qt3DRender::QRenderTarget *QBlitFramebuffer::destination() const

Returns the destination render target.

Note: Getter function for property destination.

See also setDestination().

Qt3DRender::QRenderTargetOutput::AttachmentPoint QBlitFramebuffer::destinationAttachmentPoint() const

Returns the destination attachment point.

Note: Getter function for property destinationAttachmentPoint.

See also setDestinationAttachmentPoint().

QRectF QBlitFramebuffer::destinationRect() const

Returns the destination rectangle.

Note: Getter function for property destinationRect.

See also setDestinationRect().

Qt3DRender::QBlitFramebuffer::InterpolationMethod QBlitFramebuffer::interpolationMethod() const

Returns the interpolation method.

Note: Getter function for property interpolationMethod.

See also setInterpolationMethod().

void QBlitFramebuffer::setDestination(Qt3DRender::QRenderTarget *destination)

Sets the destination render target. The default value is nullptr, in which case the destination is assumed to be be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Note: As with other nodes, destination gets automatically parented to the QBlitFramebuffer instance when no parent has been set. The lifetime is also tracked, meaning the destination reverts to nullptr in case the currently set destination is destroyed.

Note: Setter function for property destination.

See also destination().

void QBlitFramebuffer::setDestinationAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint destinationAttachmentPoint)

Sets the destinationAttachmentPoint. Defaults to Qt3DRender::QRenderTargetOutput::AttachmentPoint::Color0.

Note: Setter function for property destinationAttachmentPoint.

See also destinationAttachmentPoint().

void QBlitFramebuffer::setDestinationRect(const QRectF &outputRect)

Sets the destination rectangle to outputRect. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Note: Setter function for property destinationRect.

See also destinationRect().

void QBlitFramebuffer::setInterpolationMethod(Qt3DRender::QBlitFramebuffer::InterpolationMethod interpolationMethod)

Sets the interpolationMethod that is applied if the image is stretched. Defaults to Linear.

Note: Setter function for property interpolationMethod.

See also interpolationMethod().

void QBlitFramebuffer::setSource(Qt3DRender::QRenderTarget *source)

Sets the source render target. The default value is nullptr, in which case the source is assumed to be be the default framebuffer (i.e. the backbuffer of the current surface), if there is one.

Note: the source and destination must not refer to the same render target.

Note: As with other nodes, source gets automatically parented to the QBlitFramebuffer instance when no parent has been set. The lifetime is also tracked, meaning the source reverts to nullptr in case the currently set source is destroyed.

Note: Setter function for property source.

See also source().

void QBlitFramebuffer::setSourceAttachmentPoint(Qt3DRender::QRenderTargetOutput::AttachmentPoint sourceAttachmentPoint)

Sets the sourceAttachmentPoint. Defaults to Qt3DRender::QRenderTargetOutput::AttachmentPoint::Color0.

Note: Setter function for property sourceAttachmentPoint.

See also sourceAttachmentPoint().

void QBlitFramebuffer::setSourceRect(const QRectF &inputRect)

Sets the source rectangle to inputRect. The coordinates are assumed to follow the normal Qt coordinate system, meaning Y runs from top to bottom.

Note: Setter function for property sourceRect.

See also sourceRect().

Qt3DRender::QRenderTarget *QBlitFramebuffer::source() const

Returns the source render target.

Note: Getter function for property source.

See also setSource().

Qt3DRender::QRenderTargetOutput::AttachmentPoint QBlitFramebuffer::sourceAttachmentPoint() const

Returns the source attachment point.

Note: Getter function for property sourceAttachmentPoint.

See also setSourceAttachmentPoint().

QRectF QBlitFramebuffer::sourceRect() const

Returns the source rectangle.

Note: Getter function for property sourceRect.

See also setSourceRect().

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