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QGL Class Reference
[QtOpenGL module]

The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module. More...

Types

Static Methods


Detailed Description

The QGL namespace specifies miscellaneous identifiers used in the Qt OpenGL module.


Type Documentation

QGL.FormatOption

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

Constant Value Description
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 specification.
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 specification.

The FormatOptions type is a typedef for QFlags<FormatOption>. It stores an OR combination of FormatOption values.

See also Sample Buffers Example.


Method Documentation

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.

By default, the QPaintEngine.OpenGL2 engine is used if GL/GLES version 2.0 is available, otherwise QPaintEngine.OpenGL is used.

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

This function was introduced in Qt 4.6.


PyQt 4.12 for X11Copyright © Riverbank Computing Ltd and The Qt Company 2015Qt 4.8.7