QGL Namespace

The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL 模块。更多...

头：	#include <QGL>

类型

enum	FormatOption { DoubleBuffer, DepthBuffer, Rgba, AlphaChannel, ..., NoDeprecatedFunctions }
flags	FormatOptions

函数

void	setPreferredPaintEngine (QPaintEngine::Type engineType )

详细描述

The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL 模块。

类型文档编制

enum QGL:: FormatOption
flags QGL:: FormatOptions

This enum specifies the format options that can be used to configure an OpenGL context. These are set using QGLFormat::setOption ().

常量	值	描述
`QGL::DoubleBuffer`	`0x0001`	Specifies the use of double buffering.
`QGL::DepthBuffer`	`0x0002`	Enables the use of a depth buffer.
`QGL::Rgba`	`0x0004`	Specifies that the context should use RGBA as its pixel format.
`QGL::AlphaChannel`	`0x0008`	Enables the use of an alpha channel.
`QGL::AccumBuffer`	`0x0010`	Enables the use of an accumulation buffer.
`QGL::StencilBuffer`	`0x0020`	Enables the use of a stencil buffer.
`QGL::StereoBuffers`	`0x0040`	Enables the use of a stereo buffers for use with visualization hardware.
`QGL::DirectRendering`	`0x0080`	Specifies that the context is used for direct rendering to a display.
`QGL::HasOverlay`	`0x0100`	Enables the use of an overlay.
`QGL::SampleBuffers`	`0x0200`	Enables the use of sample buffers.
`QGL::DeprecatedFunctions`	`0x0400`	Enables the use of deprecated functionality for OpenGL 3.x contexts. A context with deprecated functionality enabled is called a full context in the OpenGL 规范。
`QGL::SingleBuffer`	`DoubleBuffer<<16`	Specifies the use of a single buffer, as opposed to double buffers.
`QGL::NoDepthBuffer`	`DepthBuffer<<16`	Disables the use of a depth buffer.
`QGL::ColorIndex`	`Rgba<<16`	Specifies that the context should use a color index as its pixel format.
`QGL::NoAlphaChannel`	`AlphaChannel<<16`	Disables the use of an alpha channel.
`QGL::NoAccumBuffer`	`AccumBuffer<<16`	Disables the use of an accumulation buffer.
`QGL::NoStencilBuffer`	`StencilBuffer<<16`	Disables the use of a stencil buffer.
`QGL::NoStereoBuffers`	`StereoBuffers<<16`	Disables the use of stereo buffers.
`QGL::IndirectRendering`	`DirectRendering<<16`	Specifies that the context is used for indirect rendering to a buffer.
`QGL::NoOverlay`	`HasOverlay<<16`	Disables the use of an overlay.
`QGL::NoSampleBuffers`	`SampleBuffers<<16`	Disables the use of sample buffers.
`QGL::NoDeprecatedFunctions`	`DeprecatedFunctions<<16`	Disables the use of deprecated functionality for OpenGL 3.x contexts. A context with deprecated functionality disabled is called a forward compatible context in the OpenGL 规范。

FormatOptions 类型是 typedef 对于 QFlags <FormatOption>。它存储 FormatOption 值的 OR 组合。

另请参阅 Sample Buffers Example .

函数文档编制

void QGL:: setPreferredPaintEngine ( QPaintEngine::Type engineType )

Sets the preferred OpenGL paint engine that is used to draw onto QGLWidget , QGLPixelBuffer and QGLFramebufferObject targets with QPainter in Qt.

The engineType parameter specifies which of the GL engines to use. Only QPaintEngine::OpenGL and QPaintEngine::OpenGL2 are valid parameters to this function. All other values are ignored.

默认情况下， QPaintEngine::OpenGL2 engine is used if GL/GLES version 2.0 is available, otherwise QPaintEngine::OpenGL 被使用。

警告： This function must be called before the QApplication constructor is called.

该函数在 Qt 4.6 引入。

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