# QGL Class Reference
## [[QtOpenGL](index.htm) module]
該QGL命名空間指定了Qt的OpenGL模塊中使用的其他標識符。[More...](#details)
### Types
* `enum FormatOption { DoubleBuffer, DepthBuffer, Rgba, AlphaChannel, ..., NoDeprecatedFunctions }`
* `class **[FormatOptions](index.htm)**`
### Static Methods
* `setPreferredPaintEngine (QPaintEngine.Type?engineType)`
* * *
## Detailed Description
該QGL命名空間指定了Qt的OpenGL模塊中使用的其他標識符。
* * *
## Type Documentation
```
QGL.FormatOption
```
此枚舉指定可用于配置OpenGL上下文的格式選項。這些是使用設置[QGLFormat.setOption](qglformat.html#setOption)（ ） 。
| Constant | Value | Description |
| --- | --- | --- |
| `QGL.DoubleBuffer` | `0x0001` | 指定使用雙緩沖的。 |
| `QGL.DepthBuffer` | `0x0002` | 允許使用深度緩沖的。 |
| `QGL.Rgba` | `0x0004` | 指定的上下文中應該使用的RGBA作為其像素格式。 |
| `QGL.AlphaChannel` | `0x0008` | 允許使用alpha通道的。 |
| `QGL.AccumBuffer` | `0x0010` | 允許使用的累加緩沖器。 |
| `QGL.StencilBuffer` | `0x0020` | 允許使用模板緩沖區。 |
| `QGL.StereoBuffers` | `0x0040` | 支持使用立體聲緩沖器具有可視化的硬件使用。 |
| `QGL.DirectRendering` | `0x0080` | 指定上下文被用于直接渲染到顯示器。 |
| `QGL.HasOverlay` | `0x0100` | 允許使用重疊的。 |
| `QGL.SampleBuffers` | `0x0200` | 允許使用樣本緩沖區。 |
| `QGL.DeprecatedFunctions` | `0x0400` | 允許使用過時的功能為OpenGL 3.x的上下文。啟用了棄用功能的上下文被稱為OpenGL規范一個完整的上下文。 |
| `QGL.SingleBuffer` | `DoubleBuffer<<16` | 指定使用一個單一的緩沖液中，相對于雙緩沖器。 |
| `QGL.NoDepthBuffer` | `DepthBuffer<<16` | 禁止使用深度緩沖的。 |
| `QGL.ColorIndex` | `Rgba<<16` | 指定的上下文中應該使用的顏色索引作為其像素格式。 |
| `QGL.NoAlphaChannel` | `AlphaChannel<<16` | 禁止使用Alpha通道。 |
| `QGL.NoAccumBuffer` | `AccumBuffer<<16` | 禁止使用積累的緩沖區。 |
| `QGL.NoStencilBuffer` | `StencilBuffer<<16` | 禁止使用模板緩沖區。 |
| `QGL.NoStereoBuffers` | `StereoBuffers<<16` | 禁止使用立體聲緩沖區。 |
| `QGL.IndirectRendering` | `DirectRendering<<16` | 指定該上下文被用于間接渲染到一個緩沖區中。 |
| `QGL.NoOverlay` | `HasOverlay<<16` | 禁止使用重疊的。 |
| `QGL.NoSampleBuffers` | `SampleBuffers<<16` | 禁止使用樣本緩沖區。 |
| `QGL.NoDeprecatedFunctions` | `DeprecatedFunctions<<16` | 禁止使用過時的功能為OpenGL 3.x的上下文。禁用過時的功能的情況下被調用OpenGL規范向前兼容的上下文。 |
該FormatOptions類型是一個typedef為[QFlags](index.htm)\u003cFormatOption\u003e 。它存儲FormatOption值的或組合。
**See also** [Sample Buffers Example](index.htm)。
* * *
## Method Documentation
```
QGL.setPreferredPaintEngine (QPaintEngine.Type?engineType)
```
設置用于繪制到首選的OpenGL繪圖引擎[QGLWidget](qglwidget.html)，[QGLPixelBuffer](qglpixelbuffer.html)和[QGLFramebufferObject](qglframebufferobject.html)與目標[QPainter](qpainter.html)Qt中。
該_engineType_參數指定了GL的發動機使用的。只`QPaintEngine.OpenGL`和`QPaintEngine.OpenGL2`是有效的參數傳遞給該函數。所有其他值將被忽略。
默認情況下，`QPaintEngine.OpenGL2`引擎時使用GL / GLES 2.0版是可用的，否則`QPaintEngine.OpenGL`被使用。
**Warning:**此功能之前，必須調用[QApplication](qapplication.html)構造函數被調用。
此功能被引入Qt的4.6 。
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