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# QGL Namespace Reference
[QtOpenGL module]

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

     #include <QGL>

### Types

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

## Detailed Description

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

## Type Documentation

### 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().

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::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.

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

See also Sample Buffers Example.