# QGLBuffer Class Reference
## [[QtOpenGL](index.htm) module]
该QGLBuffer类提供用于创建和管理GL缓冲区对象。[More...](#details)
### Types
* `enum Access { ReadOnly, WriteOnly, ReadWrite }`
* `enum Type { VertexBuffer, IndexBuffer, PixelPackBuffer, PixelUnpackBuffer }`
* `enum UsagePattern { StreamDraw, StreamRead, StreamCopy, StaticDraw, ..., DynamicCopy }`
### Methods
* `__init__ (self)`
* `__init__ (self, Type type)`
* `__init__ (self, QGLBuffer other)`
* `allocate (self, sip.voidptr data, int count)`
* `allocate (self, int count)`
* `bool bind (self)`
* `int bufferId (self)`
* `bool create (self)`
* `destroy (self)`
* `bool isCreated (self)`
* `sip.voidptr map (self, Access access)`
* `bool read (self, int offset, sip.voidptr data, int count)`
* `release (self)`
* `setUsagePattern (self, UsagePattern value)`
* `int size (self)`
* `Type type (self)`
* `bool unmap (self)`
* `UsagePattern usagePattern (self)`
* `write (self, int offset, sip.voidptr data, int count)`
### Static Methods
* `release (Type type)`
* * *
## Detailed Description
该QGLBuffer类提供用于创建和管理GL缓冲区对象。
缓冲对象在GL服务器创建,使客户端应用程序可避免上传顶点,索引,纹理图像数据等,他们需要每一次。
QGLBuffer对象可以被复制围绕作为参照相关GL缓冲对象:
```
QGLBuffer buffer1(QGLBuffer.IndexBuffer);
buffer1.create();
QGLBuffer buffer2 = buffer1;
```
QGLBuffer进行浅拷贝时,对象被复制以这种方式,但没有实现副本上写的语义。原来的对象会受到影响每当副本被修改。
* * *
## Type Documentation
```
QGLBuffer.Access
```
这个枚举变量定义的访问模式[QGLBuffer.map](qglbuffer.html#map)( ) 。
| Constant | Value | Description |
| --- | --- | --- |
| `QGLBuffer.ReadOnly` | `0x88B8` | 该缓冲区将被映射为只读。 |
| `QGLBuffer.WriteOnly` | `0x88B9` | 该缓冲区将被映射为只写。 |
| `QGLBuffer.ReadWrite` | `0x88BA` | 该缓冲区将被映射为阅读和写作。 |
```
QGLBuffer.Type
```
这个枚举变量定义GL缓冲对象的创建与类型[QGLBuffer](qglbuffer.html)。
| Constant | Value | Description |
| --- | --- | --- |
| `QGLBuffer.VertexBuffer` | `0x8892` | 顶点缓冲对象指定顶点数组时使用。 |
| `QGLBuffer.IndexBuffer` | `0x8893` | 与使用索引缓冲区对象`glDrawElements()`。 |
| `QGLBuffer.PixelPackBuffer` | `0x88EB` | 自GL服务器读取像素数据的像素组缓存对象(例如,与`glReadPixels()`) 。下的OpenGL / ES不支持。 |
| `QGLBuffer.PixelUnpackBuffer` | `0x88EC` | 为像素数据写入到GL服务器(例如,以像素解包缓冲区对象`glTexImage2D()`) 。下的OpenGL / ES不支持。 |
```
QGLBuffer.UsagePattern
```
这个枚举变量定义的使用模式[QGLBuffer](qglbuffer.html)对象。
| Constant | Value | Description |
| --- | --- | --- |
| `QGLBuffer.StreamDraw` | `0x88E0` | 这些数据将被设置一次,用过几次的绘图操作。下OpenGL / ES 1.1 ,这是相同的StaticDraw 。 |
| `QGLBuffer.StreamRead` | `0x88E1` | 这些数据将被设置一次,用过几次读回数据从GL服务器。下的OpenGL / ES不支持。 |
| `QGLBuffer.StreamCopy` | `0x88E2` | 这些数据将被设置一次,用过几次读取数据从GL服务器回在进一步的绘制操作使用。下的OpenGL / ES不支持。 |
| `QGLBuffer.StaticDraw` | `0x88E4` | 这些数据将被设置一次,多次使用的绘图操作。 |
| `QGLBuffer.StaticRead` | `0x88E5` | 这些数据将被设置一次,多次使用读回数据从GL服务器。下的OpenGL / ES不支持。 |
| `QGLBuffer.StaticCopy` | `0x88E6` | 这些数据将被设置一次,多次使用,用于读取数据从GL服务器回在进一步的绘制操作使用。下的OpenGL / ES不支持。 |
| `QGLBuffer.DynamicDraw` | `0x88E8` | 该数据将被反复修改和多次使用的绘图操作。 |
| `QGLBuffer.DynamicRead` | `0x88E9` | 该数据将被反复修改和多次使用读回数据从GL服务器。下的OpenGL / ES不支持。 |
| `QGLBuffer.DynamicCopy` | `0x88EA` | 该数据将被反复修改和多次使用,用于读取数据从GL服务器回在进一步的绘制操作使用。下的OpenGL / ES不支持。 |
* * *
## Method Documentation
```
QGLBuffer.__init__ (self)
```
构造类型的一个新的缓冲区对象[QGLBuffer.VertexBuffer](qglbuffer.html#Type-enum)。
注:此构造函数只是创建[QGLBuffer](qglbuffer.html)实例。在GL服务器的实际缓冲区对象不创建,直到[create](qglbuffer.html#create)()被调用。
**See also** [create](qglbuffer.html#create)( ) 。
```
QGLBuffer.__init__ (self, Type type)
```
构建了一个新的缓冲区对象_type_。
注:此构造函数只是创建[QGLBuffer](qglbuffer.html)实例。在GL服务器的实际缓冲区对象不创建,直到[create](qglbuffer.html#create)()被调用。
**See also** [create](qglbuffer.html#create)( ) 。
```
QGLBuffer.__init__ (self, QGLBuffer other)
```
构造的浅表副本_other_。
注意:[QGLBuffer](qglbuffer.html)没有实现副本上写的语义,所以_other_将受到影响每当副本被修改。
```
QGLBuffer.allocate (self, sip.voidptr data, int count)
```
中分配_count_的空间的缓冲区中的字节,并将其初始化内容_data_。任何以前的内容将被删除。
假定[create](qglbuffer.html#create)( )被调用这个缓冲区,它已经绑定到当前的上下文。
**See also** [create](qglbuffer.html#create)( )[read](qglbuffer.html#read)()和[write](qglbuffer.html#write)( ) 。
```
QGLBuffer.allocate (self, int count)
```
这是一个重载函数。
中分配_count_的空间字节的缓冲区。任何以前的内容将被删除。
假定[create](qglbuffer.html#create)( )被调用这个缓冲区,它已经绑定到当前的上下文。
**See also** [create](qglbuffer.html#create)()和[write](qglbuffer.html#write)( ) 。
```
bool QGLBuffer.bind (self)
```
结合与此对象到当前的GL上下文相关联的缓冲区。如果结合是不可能的,通常是因为返回False[type](qglbuffer.html#type)( )不支持此GL实现。
该缓冲区必须被绑定到同一个[QGLContext](qglcontext.html)当电流[create](qglbuffer.html#create)( )被调用,或到另一个[QGLContext](qglcontext.html)这是分享它。否则为False将被从这个函数返回。
**See also** [release](qglbuffer.html#release)()和[create](qglbuffer.html#create)( ) 。
```
int QGLBuffer.bufferId (self)
```
返回与该缓冲区关联的GL标识符;如果缓冲区尚未创建为零。
**See also** [isCreated](qglbuffer.html#isCreated)( ) 。
```
bool QGLBuffer.create (self)
```
在创建GL服务器的缓冲区对象。如果在创建对象,则返回True ,否则返回False 。
此函数必须调用当前[QGLContext](qglcontext.html)。该缓冲区将被绑定到,可以在这方面(或与它共享的任何其他情况下)才能使用。
这个函数将返回False ,如果GL实现不支持的缓冲区,或者是没有电流[QGLContext](qglcontext.html)。
**See also** [isCreated](qglbuffer.html#isCreated)( )[allocate](qglbuffer.html#allocate)( )[write](qglbuffer.html#write)()和[destroy](qglbuffer.html#destroy)( ) 。
```
QGLBuffer.destroy (self)
```
摧毁这个缓冲区对象,包括GL服务器所使用的存储。到缓冲区中的所有引用都将变成无效。
```
bool QGLBuffer.isCreated (self)
```
如果这个缓冲区已经建立,则返回True ,否则返回False 。
**See also** [create](qglbuffer.html#create)()和[destroy](qglbuffer.html#destroy)( ) 。
```
sip.voidptr QGLBuffer.map (self, Access access)
```
这个映射缓冲区的内容到应用程序的内存空间,并返回一个指向它的指针。返回null ,如果内存映射是不可能的。该_access_参数表示将要执行的访问类型。
假定[create](qglbuffer.html#create)( )被调用这个缓冲区,它已经绑定到当前的上下文。
此功能仅是下的OpenGL / ES的支持,如果`GL_OES_mapbuffer`扩展出现。
**See also** [unmap](qglbuffer.html#unmap)( )[create](qglbuffer.html#create)()和[bind](qglbuffer.html#bind)( ) 。
```
bool QGLBuffer.read (self, int offset, sip.voidptr data, int count)
```
读取_count_在这个缓冲区起始字节_offset_成_data_。如果不支持从缓冲区读取错误;在成功时返回真。下的OpenGL / ES不支持的缓冲区读取。
据推测,此缓冲区已被绑定到当前上下文。
**See also** [write](qglbuffer.html#write)()和[bind](qglbuffer.html#bind)( ) 。
```
QGLBuffer.release (self)
```
释放与从目前的GL上下文此对象关联的缓冲区。
这个函数必须被调用,使用相同的[QGLContext](qglcontext.html)电流时[bind](qglbuffer.html#bind)( )被调用的缓冲区。
**See also** [bind](qglbuffer.html#bind)( ) 。
```
QGLBuffer.release (Type type)
```
释放与相关联的缓冲_type_在当前的[QGLContext](qglcontext.html)。
此功能是直接调用`glBindBuffer(type, 0)`使用时,调用者不知道哪些[QGLBuffer](qglbuffer.html)已经被绑定到上下文,但要确保它被释放。
```
[QGLBuffer](qglbuffer.html).release([QGLBuffer](qglbuffer.html).VertexBuffer);
```
```
QGLBuffer.setUsagePattern (self, UsagePattern value)
```
设置此缓冲区对象的使用模式_value_。这个函数必须在被调用[allocate](qglbuffer.html#allocate)()或[write](qglbuffer.html#write)( ) 。
**See also** [usagePattern](qglbuffer.html#usagePattern)( )[allocate](qglbuffer.html#allocate)()和[write](qglbuffer.html#write)( ) 。
```
int QGLBuffer.size (self)
```
返回数据的大小在此缓冲液中,用于读取操作。返回-1,如果读取缓冲区的大小是不支持,或者缓冲尚未建立。
据推测,此缓冲区已被绑定到当前上下文。
**See also** [isCreated](qglbuffer.html#isCreated)()和[bind](qglbuffer.html#bind)( ) 。
```
Type QGLBuffer.type (self)
```
[
返回缓冲区的当前对象表示的类型。
```
bool QGLBuffer.unmap (self)
```
](qglbuffer.html#Type-enum)
[取消映射缓冲区它被映射到应用程序的内存空间与以前调用后](qglbuffer.html#Type-enum)[map](qglbuffer.html#map)( ) 。返回True如果取消映射成功,否则返回False 。
据推测,此缓冲区已被绑定到当前上下文,它先前被映射到[map](qglbuffer.html#map)( ) 。
此功能仅是下的OpenGL / ES的支持,如果`GL_OES_mapbuffer`扩展出现。
**See also** [map](qglbuffer.html#map)( ) 。
```
UsagePattern QGLBuffer.usagePattern (self)
```
[](qglbuffer.html#UsagePattern-enum)
[返回此缓冲区对象的使用模式。缺省值是](qglbuffer.html#UsagePattern-enum)[StaticDraw](qglbuffer.html#UsagePattern-enum)。
**See also** [setUsagePattern](qglbuffer.html#setUsagePattern)( ) 。
```
QGLBuffer.write (self, int offset, sip.voidptr data, int count)
```
替换_count_这个缓冲区的字节开始_offset_同的内容_data_。在缓冲区内的任何其他字节将保持不变。
假定[create](qglbuffer.html#create)( )被调用这个缓冲区,它已经绑定到当前的上下文。
**See also** [create](qglbuffer.html#create)( )[read](qglbuffer.html#read)()和[allocate](qglbuffer.html#allocate)( ) 。
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- QPyDeclarativePropertyValueSource Class Reference
- QPyDesignerContainerExtension Class Reference
- QPyDesignerCustomWidgetCollectionPlugin Class Reference
- QPyDesignerCustomWidgetPlugin Class Reference
- QPyDesignerMemberSheetExtension Class Reference
- QPyDesignerPropertySheetExtension Class Reference
- QPyDesignerTaskMenuExtension Class Reference
- QPyNullVariant Class Reference
- QPyTextObject Class Reference
- QQuaternion Class Reference
- QRadialGradient Class Reference
- QRadioButton Class Reference
- QRawFont Class Reference
- QReadLocker Class Reference
- QReadWriteLock Class Reference
- QRect Class Reference
- QRectF Class Reference
- QRegExp Class Reference
- QRegExpValidator Class Reference
- QRegion Class Reference
- QResizeEvent Class Reference
- QResource Class Reference
- QRubberBand Class Reference
- QRunnable Class Reference
- QScriptClass Class Reference
- QScriptClassPropertyIterator Class Reference
- QScriptContext Class Reference
- QScriptContextInfo Class Reference
- QScriptEngine Class Reference
- QScriptEngineAgent Class Reference
- QScriptEngineDebugger Class Reference
- QScriptString Class Reference
- QScriptSyntaxCheckResult Class Reference
- QScriptValue Class Reference
- QScriptValueIterator Class Reference
- QScrollArea Class Reference
- QScrollBar Class Reference
- QSemaphore Class Reference
- QSequentialAnimationGroup Class Reference
- QSessionManager Class Reference
- QSettings Class Reference
- QSharedMemory Class Reference
- QShortcut Class Reference
- QShortcutEvent Class Reference
- QShowEvent Class Reference
- QSignalMapper Class Reference
- QSignalTransition Class Reference
- QSimpleXmlNodeModel Class Reference
- QSize Class Reference
- QSizeF Class Reference
- QSizeGrip Class Reference
- QSizePolicy Class Reference
- QSlider Class Reference
- QSocketNotifier Class Reference
- QSortFilterProxyModel Class Reference
- QSound Class Reference
- QSourceLocation Class Reference
- QSpacerItem Class Reference
- QSpinBox Class Reference
- QSplashScreen Class Reference
- QSplitter Class Reference
- QSplitterHandle Class Reference
- QSql Class Reference
- QSqlDatabase Class Reference
- QSqlDriver Class Reference
- QSqlDriverCreatorBase Class Reference
- QSqlError Class Reference
- QSqlField Class Reference
- QSqlIndex Class Reference
- QSqlQuery Class Reference
- QSqlQueryModel Class Reference
- QSqlRecord Class Reference
- QSqlRelation Class Reference
- QSqlRelationalDelegate Class Reference
- QSqlRelationalTableModel Class Reference
- QSqlResult Class Reference
- QSqlTableModel Class Reference
- Qt4.7文档翻译:Qt样式单参考,Qt Style Sheets Reference
- QSsl Class Reference
- QSslCertificate Class Reference
- QSslCipher Class Reference
- QSslConfiguration Class Reference
- QSslError Class Reference
- QSslKey Class Reference
- QSslSocket Class Reference
- QStackedLayout Class Reference
- QStackedWidget Class Reference
- QStandardItem Class Reference
- QStandardItemModel Class Reference
- QState Class Reference
- QStateMachine Class Reference
- QStaticText Class Reference
- QStatusBar Class Reference
- QStatusTipEvent Class Reference
- QString Class Reference
- QStringList Class Reference
- QStringListModel Class Reference
- QStringMatcher Class Reference
- QStringRef Class Reference
- QStyle Class Reference
- QStyledItemDelegate Class Reference
- QStyleFactory Class Reference
- QStyleHintReturn Class Reference
- QStyleHintReturnMask Class Reference
- QStyleHintReturnVariant Class Reference
- QStyleOption Class Reference
- QStyleOptionButton Class Reference
- QStyleOptionComboBox Class Reference
- QStyleOptionComplex Class Reference
- QStyleOptionDockWidget Class Reference
- QStyleOptionDockWidgetV2 Class Reference
- QStyleOptionFocusRect Class Reference
- QStyleOptionFrame Class Reference
- QStyleOptionFrameV2 Class Reference
- QStyleOptionFrameV3 Class Reference
- QStyleOptionGraphicsItem Class Reference
- QStyleOptionGroupBox Class Reference
- QStyleOptionHeader Class Reference
- QStyleOptionMenuItem Class Reference
- QStyleOptionProgressBar Class Reference
- QStyleOptionProgressBarV2 Class Reference
- QStyleOptionRubberBand Class Reference
- QStyleOptionSizeGrip Class Reference
- QStyleOptionSlider Class Reference
- QStyleOptionSpinBox Class Reference
- QStyleOptionTab Class Reference
- QStyleOptionTabBarBase Class Reference
- QStyleOptionTabBarBaseV2 Class Reference
- QStyleOptionTabV2 Class Reference
- QStyleOptionTabV3 Class Reference
- QStyleOptionTabWidgetFrame Class Reference
- QStyleOptionTabWidgetFrameV2 Class Reference
- QStyleOptionTitleBar Class Reference
- QStyleOptionToolBar Class Reference
- QStyleOptionToolBox Class Reference
- QStyleOptionToolBoxV2 Class Reference
- QStyleOptionToolButton Class Reference
- QStyleOptionViewItem Class Reference
- QStyleOptionViewItemV2 Class Reference
- QStyleOptionViewItemV3 Class Reference
- QStyleOptionViewItemV4 Class Reference
- QStylePainter Class Reference
- QSvgGenerator Class Reference
- QSvgRenderer Class Reference
- QSvgWidget Class Reference
- QSwipeGesture Class Reference
- QSyntaxHighlighter Class Reference
- QSysInfo Class Reference
- QSystemLocale Class Reference
- QSystemSemaphore Class Reference
- QSystemTrayIcon Class Reference
- Qt Class Reference
- QTabBar Class Reference
- QTabletEvent Class Reference
- QTableView Class Reference
- QTableWidget Class Reference
- QTableWidgetItem Class Reference
- QTableWidgetSelectionRange Class Reference
- QTabWidget Class Reference
- QTapAndHoldGesture Class Reference
- QTapGesture Class Reference
- QTcpServer Class Reference
- QTcpSocket Class Reference
- QTemporaryFile Class Reference
- QTest Class Reference
- QTextBlock Class Reference
- QTextBlockFormat Class Reference
- QTextBlockGroup Class Reference
- QTextBlockUserData Class Reference
- QTextBoundaryFinder Class Reference
- QTextBrowser Class Reference
- QTextCharFormat Class Reference
- QTextCodec Class Reference
- QTextCursor Class Reference
- QTextDecoder Class Reference
- QTextDocument Class Reference
- QTextDocumentFragment Class Reference
- QTextDocumentWriter Class Reference
- QTextEdit Class Reference
- QTextEncoder Class Reference
- QTextFormat Class Reference
- QTextFragment Class Reference
- QTextFrame Class Reference
- QTextFrameFormat Class Reference
- QTextImageFormat Class Reference
- QTextInlineObject Class Reference
- QTextItem Class Reference
- QTextLayout Class Reference
- QTextLength Class Reference
- QTextLine Class Reference
- QTextList Class Reference
- QTextListFormat Class Reference
- QTextObject Class Reference
- QTextObjectInterface Class Reference
- QTextOption Class Reference
- QTextStream Class Reference
- QTextTable Class Reference
- QTextTableCell Class Reference
- QTextTableCellFormat Class Reference
- QTextTableFormat Class Reference
- QThread Class Reference
- QThreadPool Class Reference
- QTime Class Reference
- QTimeEdit Class Reference
- QTimeLine Class Reference
- QTimer Class Reference
- QTimerEvent Class Reference
- QToolBar Class Reference
- QToolBox Class Reference
- QToolButton Class Reference
- QToolTip Class Reference
- QTouchEvent Class Reference
- Reference
- QTransform Class Reference
- QTranslator Class Reference
- QTreeView Class Reference
- QTreeWidget Class Reference
- QTreeWidgetItem Class Reference
- QTreeWidgetItemIterator Class Reference
- QUdpSocket Class Reference
- QUndoCommand Class Reference
- QUndoGroup Class Reference
- QUndoStack Class Reference
- QUndoView Class Reference
- QUrl Class Reference
- QUrlInfo Class Reference
- QUuid Class Reference
- QValidator Class Reference
- QVariant Class Reference
- QVariantAnimation Class Reference
- QVBoxLayout Class Reference
- QVector2D Class Reference
- QVector3D Class Reference
- QVector4D Class Reference
- QVideoFrame Class Reference
- QVideoSurfaceFormat Class Reference
- QWaitCondition Class Reference
- QWebDatabase Class Reference
- QWebElement Class Reference
- QWebElementCollection Class Reference
- QWebFrame Class Reference
- QWebHistory Class Reference
- QWebHistoryInterface Class Reference
- QWebHistoryItem Class Reference
- QWebHitTestResult Class Reference
- QWebInspector Class Reference
- QWebPage Class Reference
- QWebPluginFactory Class Reference
- QWebSecurityOrigin Class Reference
- QWebSettings Class Reference
- QWebView Class Reference
- QWhatsThis Class Reference
- QWhatsThisClickedEvent Class Reference
- QWheelEvent Class Reference
- QWidget Class Reference
- QWidgetAction Class Reference
- QWidgetItem Class Reference
- QWindowStateChangeEvent Class Reference
- QWizard Class Reference
- QWizardPage Class Reference
- QWorkspace Class Reference
- QWriteLocker Class Reference
- QX11EmbedContainer Class Reference
- QX11EmbedWidget Class Reference
- QX11Info Class Reference
- QXmlAttributes Class Reference
- QXmlContentHandler Class Reference
- QXmlDeclHandler Class Reference
- QXmlDefaultHandler Class Reference
- QXmlDTDHandler Class Reference
- QXmlEntityResolver Class Reference
- QXmlErrorHandler Class Reference
- QXmlFormatter Class Reference
- QXmlInputSource Class Reference
- QXmlItem Class Reference
- QXmlLexicalHandler Class Reference
- QXmlLocator Class Reference
- QXmlName Class Reference
- QXmlNamePool Class Reference
- QXmlNamespaceSupport Class Reference
- QXmlNodeModelIndex Class Reference
- QXmlParseException Class Reference
- QXmlQuery Class Reference
- QXmlReader Class Reference
- QXmlResultItems Class Reference
- QXmlSchema Class Reference
- QXmlSchemaValidator Class Reference
- QXmlSerializer Class Reference
- QXmlSimpleReader Class Reference
- QXmlStreamAttribute Class Reference
- QXmlStreamAttributes Class Reference
- QXmlStreamEntityDeclaration Class Reference
- QXmlStreamEntityResolver Class Reference
- QXmlStreamNamespaceDeclaration Class Reference
- QXmlStreamNotationDeclaration Class Reference
- QXmlStreamReader Class Reference
- QXmlStreamWriter Class Reference