内容

• 公共类型
• 特性
• 公共函数
• 公共槽
• 信号
• 相关非成员
• 详细描述

QBuffer 类

class Qt3DRender ::QBuffer

Provides a data store for raw data to later be used as vertices or uniforms. 更多...

头：	#include <Qt3DRender/QBuffer>
qmake:	QT += 3drender
实例化：	Buffer
继承：	Qt3DCore::QNode

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公共类型

enum	AccessType { Write, Read, ReadWrite }
enum	UsageType { StreamDraw, StreamRead, StreamCopy, StaticDraw, StaticRead, …, DynamicCopy }

特性

• accessType : AccessType
• syncData : bool
• usage : UsageType

公共函数

	QBuffer (Qt3DCore::QNode * parent = nullptr)
Qt3DRender::QBuffer::AccessType	accessType () const
QByteArray	data () const
Qt3DRender::QBufferDataGeneratorPtr	dataGenerator () const
bool	isSyncData () const
void	setData (const QByteArray & bytes )
void	setDataGenerator (const Qt3DRender::QBufferDataGeneratorPtr & functor )
void	updateData (int offset , const QByteArray & bytes )
Qt3DRender::QBuffer::UsageType	usage () const

公共槽

void	setAccessType (Qt3DRender::QBuffer::AccessType access )
void	setSyncData (bool syncData )
void	setUsage (Qt3DRender::QBuffer::UsageType usage )

信号

void	accessTypeChanged (Qt3DRender::QBuffer::AccessType access )
void	dataAvailable ()
void	dataChanged (const QByteArray & bytes )
void	syncDataChanged (bool syncData )
void	usageChanged (Qt3DRender::QBuffer::UsageType usage )

相关非成员

typedef

QBufferDataGeneratorPtr

详细描述

Data can either be provided directly using QBuffer::setData () or by specifying a generator with QBuffer::setDataGenerator () and providing a Qt3DRender::QBufferDataGeneratorPtr .

When using a generator the data will be loaded asynchronously in a job. The loaded data can be read back if the QBuffer::syncData flag is set to true.

成员类型文档编制

enum QBuffer:: AccessType

常量	值	描述
Qt3DRender::QBuffer::Write	0x1	Write access
Qt3DRender::QBuffer::Read	0x2	Read access
Qt3DRender::QBuffer::ReadWrite	Write|Read	Write|Read

enum QBuffer:: UsageType

The type of the usage.

常量	值	描述
Qt3DRender::QBuffer::StreamDraw	0x88E0	GL_STREAM_DRAW
Qt3DRender::QBuffer::StreamRead	0x88E1	GL_STREAM_READ
Qt3DRender::QBuffer::StreamCopy	0x88E2	GL_STREAM_COPY
Qt3DRender::QBuffer::StaticDraw	0x88E4	GL_STATIC_DRAW
Qt3DRender::QBuffer::StaticRead	0x88E5	GL_STATIC_READ
Qt3DRender::QBuffer::StaticCopy	0x88E6	GL_STATIC_COPY
Qt3DRender::QBuffer::DynamicDraw	0x88E8	GL_DYNAMIC_DRAW
Qt3DRender::QBuffer::DynamicRead	0x88E9	GL_DYNAMIC_READ
Qt3DRender::QBuffer::DynamicCopy	0x88EA	GL_DYNAMIC_COPY

特性文档编制

accessType : AccessType

返回 AccessType of the buffer.

访问函数：

Qt3DRender::QBuffer::AccessType	accessType () const
void	setAccessType (Qt3DRender::QBuffer::AccessType access )

通知程序信号：

void	accessTypeChanged (Qt3DRender::QBuffer::AccessType access )

另请参阅 QBuffer::AccessType .

syncData : bool

Holds the syncData flag. When syncData is true, this will force data created by a Qt3DRender::QBufferDataGenerator to also be updated on the frontend Qt3DRender::QBuffer node. By default syncData is false.

注意： : This has no effect if the buffer's data was set directly using the data property.

访问函数：

bool	isSyncData () const
void	setSyncData (bool syncData )

通知程序信号：

void	syncDataChanged (bool syncData )

usage : UsageType

Holds the buffer usage.

访问函数：

Qt3DRender::QBuffer::UsageType	usage () const
void	setUsage (Qt3DRender::QBuffer::UsageType usage )

通知程序信号：

void	usageChanged (Qt3DRender::QBuffer::UsageType usage )

成员函数文档编制

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

Constructs a new QBuffer with parent .

[signal] void QBuffer:: dataAvailable ()

This signal is emitted when data becomes available.

[signal] void QBuffer:: dataChanged (const QByteArray & bytes )

This signal is emitted with bytes when data changes.

QByteArray QBuffer:: data () const

Returns the data.

另请参阅 setData ().

Qt3DRender::QBufferDataGeneratorPtr QBuffer:: dataGenerator () const

Returns the buffer functor.

另请参阅 setDataGenerator ().

void QBuffer:: setData (const QByteArray & bytes )

设置 bytes as data.

另请参阅 data ().

void QBuffer:: setDataGenerator (const Qt3DRender::QBufferDataGeneratorPtr & functor )

Sets the buffer functor .

另请参阅 dataGenerator ().

void QBuffer:: updateData ( int offset , const QByteArray & bytes )

Updates the data by replacing it with bytes at offset .

注意： 此函数可以被援引，通过元对象系统和从 QML。见 Q_INVOKABLE .

相关非成员

typedef QBufferDataGeneratorPtr