内容

• 特性
• 公共函数
• 公共槽
• 信号
• 详细描述

QComputeCommand Class

class Qt3DRender ::QComputeCommand

QComponent to issue work for the compute shader on GPU. 更多...

头：	#include <QComputeCommand>
qmake:	QT += 3drender
Since:	Qt 5.7
实例化：	ComputeCommand
继承：	Qt3DCore::QComponent

该类在 Qt 5.7 引入。

• 所有成员列表，包括继承成员

特性

• runType : RunType
• workGroupX : int
• workGroupY : int
• workGroupZ : int

公共函数

	QComputeCommand (Qt3DCore::QNode * parent = nullptr)
Qt3DRender::QComputeCommand::RunType	runType () const
int	workGroupX () const
int	workGroupY () const
int	workGroupZ () const

公共槽

void	setRunType (Qt3DRender::QComputeCommand::RunType runType )
void	setWorkGroupX (int workGroupX )
void	setWorkGroupY (int workGroupY )
void	setWorkGroupZ (int workGroupZ )
void	trigger (int workGroupX , int workGroupY , int workGroupZ , int frameCount = 1)
void	trigger (int frameCount = 1)

信号

void	runTypeChanged ()
void	workGroupXChanged ()
void	workGroupYChanged ()
void	workGroupZChanged ()

详细描述

A Qt3DRender::QComputeCommand is used to issue work for the compute shader. The compute shader is specified in the QMaterial component of the same entity the QComputeCommand is added to. The workGroupX , workGroupY and workGroupZ properties specify the work group sizes for the compute shader invocation. Qt3DRender::QDispatchCompute node needs to be present in the FrameGraph to actually issue the commands.

注意： If the rendering policy is set to Qt3DRender::QRenderSettings::OnDemand and there are no changes to the scene, the ComputeCommand will not be invoked repeatedly. The Qt3DRender::QRenderSettings::Always render policy must be set for the ComputeCommand to be repeatedly invoked if there are no other changes to the scene that triggers rendering a new frame.

特性文档编制

runType : RunType

Specifies whether the compute command should be performed every frame or manually triggered.

If set to Continuous, Compute command is executed everyframe. This is the default.

If set to Manual CompouteCommand is executed for a given number of frames and then the component disables itself.

访问函数：

Qt3DRender::QComputeCommand::RunType	runType () const
void	setRunType (Qt3DRender::QComputeCommand::RunType runType )

通知程序信号：

void	runTypeChanged ()

workGroupX : int

Specifies X workgroup size.

访问函数：

int	workGroupX () const
void	setWorkGroupX (int workGroupX )

通知程序信号：

void	workGroupXChanged ()

workGroupY : int

Specifies Y workgroup size.

访问函数：

int	workGroupY () const
void	setWorkGroupY (int workGroupY )

通知程序信号：

void	workGroupYChanged ()

workGroupZ : int

Specifies Z workgroup size.

访问函数：

int	workGroupZ () const
void	setWorkGroupZ (int workGroupZ )

通知程序信号：

void	workGroupZChanged ()

成员函数文档编制

QComputeCommand:: QComputeCommand ( Qt3DCore::QNode * parent = nullptr)

The constructor creates a new Qt3DRender::QComputeCommand instance with the specified parent .

[slot] void QComputeCommand:: setWorkGroupX ( int workGroupX )

Sets the workgroup for the first dimension to workGroupX .

注意： Setter 函数对于特性 workGroupX .

另请参阅 workGroupX ().

[slot] void QComputeCommand:: setWorkGroupY ( int workGroupY )

Sets the workgroup for the second dimension to workGroupY .

注意： Setter 函数对于特性 workGroupY .

另请参阅 workGroupY ().

[slot] void QComputeCommand:: setWorkGroupZ ( int workGroupZ )

Sets the workgroup for the third dimension to workGroupZ .

注意： Setter 函数对于特性 workGroupZ .

另请参阅 workGroupZ ().

[slot] void QComputeCommand:: trigger ( int workGroupX , int workGroupY , int workGroupZ , int frameCount = 1)

When the run type is set to Manual, calling trigger will make the compute command be executed for the next frameCount frames. Upon completion of the execution, the enabled property will be set to false. The size of the workgroup previously set will be overridden with workGroupX , workGroupY , workGroupZ .

[slot] void QComputeCommand:: trigger ( int frameCount = 1)

When the run type is set to Manual, calling trigger will make the compute command be executed for the next frameCount frames. Upon completion of the execution, the enabled property will be set to false.