QGLFormat Class

QGLFormat fmt;
fmt.setAlpha(true);
fmt.setStereo(true);
QGLFormat::setDefaultFormat(fmt);
					

QGLFormat fmt;
fmt.setDoubleBuffer(false);                 // single buffer
fmt.setDirectRendering(false);              // software rendering
MyGLWidget* myWidget = new MyGLWidget(fmt, ...);
					

QGLFormat fmt;
fmt.setOverlay(true);
fmt.setStereo(true);
MyGLWidget* myWidget = new MyGLWidget(fmt, ...);
if (!myWidget->format().stereo()) {
    // ok, goggles off
    if (!myWidget->format().hasOverlay()) {
        qFatal("Cool hardware required");
    }
}
					

OpenGL is a trademark of Silicon Graphics, Inc. in the United States and other countries.

另请参阅 QGLContext and QGLWidget .

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enum QGLFormat:: OpenGLContextProfile

This enum describes the OpenGL context profiles that can be specified for contexts implementing OpenGL version 3.2 or higher. These profiles are different from OpenGL ES profiles.

常量	值	描述
QGLFormat::NoProfile	0	OpenGL version is lower than 3.2.
QGLFormat::CoreProfile	1	Functionality deprecated in OpenGL version 3.0 is not available.
QGLFormat::CompatibilityProfile	2	Functionality from earlier OpenGL versions is available.

该枚举在 Qt 4.7 引入或被修改。

enum QGLFormat:: OpenGLVersionFlag
flags QGLFormat:: OpenGLVersionFlags

This enum describes the various OpenGL versions that are recognized by Qt. Use the QGLFormat::openGLVersionFlags () function to identify which versions that are supported at runtime.

常量	值	描述
QGLFormat::OpenGL_Version_None	0x00000000	If no OpenGL is present or if no OpenGL context is current.
QGLFormat::OpenGL_Version_1_1	0x00000001	OpenGL version 1.1 or higher is present.
QGLFormat::OpenGL_Version_1_2	0x00000002	OpenGL version 1.2 or higher is present.
QGLFormat::OpenGL_Version_1_3	0x00000004	OpenGL version 1.3 or higher is present.
QGLFormat::OpenGL_Version_1_4	0x00000008	OpenGL version 1.4 or higher is present.
QGLFormat::OpenGL_Version_1_5	0x00000010	OpenGL version 1.5 or higher is present.
QGLFormat::OpenGL_Version_2_0	0x00000020	OpenGL version 2.0 or higher is present. Note that version 2.0 supports all the functionality of version 1.5.
QGLFormat::OpenGL_Version_2_1	0x00000040	OpenGL version 2.1 or higher is present.
QGLFormat::OpenGL_Version_3_0	0x00001000	OpenGL version 3.0 or higher is present.
QGLFormat::OpenGL_Version_3_1	0x00002000	OpenGL version 3.1 or higher is present. Note that OpenGL version 3.1 or higher does not necessarily support all the features of version 3.0 and lower.
QGLFormat::OpenGL_Version_3_2	0x00004000	OpenGL version 3.2 or higher is present.
QGLFormat::OpenGL_Version_3_3	0x00008000	OpenGL version 3.3 or higher is present.
QGLFormat::OpenGL_Version_4_0	0x00010000	OpenGL version 4.0 or higher is present.
QGLFormat::OpenGL_Version_4_1	0x00020000	OpenGL version 4.1 or higher is present.
QGLFormat::OpenGL_Version_4_2	0x00040000	OpenGL version 4.2 or higher is present.
QGLFormat::OpenGL_Version_4_3	0x00080000	OpenGL version 4.3 or higher is present.
QGLFormat::OpenGL_ES_CommonLite_Version_1_0	0x00000100	OpenGL ES version 1.0 Common Lite or higher is present.
QGLFormat::OpenGL_ES_Common_Version_1_0	0x00000080	OpenGL ES version 1.0 Common or higher is present. The Common profile supports all the features of Common Lite.
QGLFormat::OpenGL_ES_CommonLite_Version_1_1	0x00000400	OpenGL ES version 1.1 Common Lite or higher is present.
QGLFormat::OpenGL_ES_Common_Version_1_1	0x00000200	OpenGL ES version 1.1 Common or higher is present. The Common profile supports all the features of Common Lite.
QGLFormat::OpenGL_ES_Version_2_0	0x00000800	OpenGL ES version 2.0 or higher is present. Note that OpenGL ES version 2.0 does not support all the features of OpenGL ES 1.x. So if OpenGL_ES_Version_2_0 is returned, none of the ES 1.x flags are returned.

另请参阅 http://www.opengl.org for more information about the different revisions of OpenGL.

该枚举在 Qt 4.2 引入或被修改。

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

另请参阅 openGLVersionFlags ().

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QGLFormat:: QGLFormat ()

构造 QGLFormat object with the following default settings:

• Double buffer: Enabled.
• Depth buffer: Enabled.
• RGBA: Enabled (i.e., color index disabled).
• Alpha channel: Disabled.
• Accumulator buffer: Disabled.
• Stencil buffer: Enabled.
• Stereo: Disabled.
• Direct rendering: Enabled.
• Overlay: Disabled.
• Plane: 0 (i.e., normal plane).
• Multisample buffers: Disabled.

QGLFormat:: QGLFormat ( QGL::FormatOptions options , int plane = 0)

创建 QGLFormat object that is a copy of the current defaultFormat ().

若 options is not 0, the default format is modified by the specified format options. The options parameter should be QGL::FormatOption values OR'ed together.

This constructor makes it easy to specify a certain desired format in classes derived from QGLWidget, for example:

// The rendering in MyGLWidget depends on using
// stencil buffer and alpha channel
MyGLWidget::MyGLWidget(QWidget* parent)
    : QGLWidget(QGLFormat(QGL::StencilBuffer | QGL::AlphaChannel), parent)
{
    if (!format().stencil())
        qWarning("Could not get stencil buffer; results will be suboptimal");
    if (!format().alpha())
        qWarning("Could not get alpha channel; results will be suboptimal");
    ...
}
					

Note that there are QGL::FormatOption values to turn format settings both on and off, e.g. QGL::DepthBuffer and QGL::NoDepthBuffer , QGL::DirectRendering and QGL::IndirectRendering ，等。

plane parameter defaults to 0 and is the plane which this format should be associated with. Not all OpenGL implementations supports overlay/underlay rendering planes.

另请参阅 defaultFormat (), setOption ()，和 setPlane ().

QGLFormat:: QGLFormat (const QGLFormat & other )

构造副本为 other .

QGLFormat:: ~QGLFormat ()

销毁 QGLFormat .

bool QGLFormat:: accum () const

返回 true if the accumulation buffer is enabled; otherwise returns false . The accumulation buffer is disabled by default.

另请参阅 setAccum () 和 setAccumBufferSize ().

int QGLFormat:: accumBufferSize () const

Returns the accumulation buffer size.

另请参阅 setAccumBufferSize (), accum ()，和 setAccum ().

bool QGLFormat:: alpha () const

返回 true if the alpha buffer in the framebuffer is enabled; otherwise returns false . The alpha buffer is disabled by default.

另请参阅 setAlpha () 和 setAlphaBufferSize ().

int QGLFormat:: alphaBufferSize () const

Returns the alpha buffer size.

另请参阅 alpha (), setAlpha ()，和 setAlphaBufferSize ().

int QGLFormat:: blueBufferSize () const

Returns the blue buffer size.

该函数在 Qt 4.2 引入。

另请参阅 setBlueBufferSize ().

[static] QGLFormat QGLFormat:: defaultFormat ()

Returns the default QGLFormat for the application. All QGLWidget objects that are created use this format unless another format is specified, e.g. when they are constructed.

If no special default format has been set using setDefaultFormat (), the default format is the same as that created with QGLFormat ().

另请参阅 setDefaultFormat ().

[static] QGLFormat QGLFormat:: defaultOverlayFormat ()

Returns the default QGLFormat for overlay contexts.

The default overlay format is:

• Double buffer: Disabled.
• Depth buffer: Disabled.
• RGBA: Disabled (i.e., color index enabled).
• Alpha channel: Disabled.
• Accumulator buffer: Disabled.
• Stencil buffer: Disabled.
• Stereo: Disabled.
• Direct rendering: Enabled.
• Overlay: Disabled.
• Multisample buffers: Disabled.
• Plane: 1 (i.e., first overlay plane).

另请参阅 setDefaultOverlayFormat () 和 setDefaultFormat ().

bool QGLFormat:: depth () const

返回 true if the depth buffer is enabled; otherwise returns false. The depth buffer is enabled by default.

另请参阅 setDepth () 和 setDepthBufferSize ().

int QGLFormat:: depthBufferSize () const

返回深度缓冲大小。

另请参阅 depth (), setDepth ()，和 setDepthBufferSize ().

bool QGLFormat:: directRendering () const

返回 true if direct rendering is enabled; otherwise returns false.

Direct rendering is enabled by default.

另请参阅 setDirectRendering ().

bool QGLFormat:: doubleBuffer () const

返回 true if double buffering is enabled; otherwise returns false. Double buffering is enabled by default.

另请参阅 setDoubleBuffer ().

[static] QGLFormat QGLFormat:: fromSurfaceFormat (const QSurfaceFormat & format )

Returns an OpenGL format for the window format specified by format .

int QGLFormat:: greenBufferSize () const

Returns the green buffer size.

该函数在 Qt 4.2 引入。

另请参阅 setGreenBufferSize ().

[static] bool QGLFormat:: hasOpenGL ()

返回 true if the window system has any OpenGL support; otherwise returns false .

警告： This function must not be called until the QApplication object has been created.

[static] bool QGLFormat:: hasOpenGLOverlays ()

返回 true if the window system supports OpenGL overlays; otherwise returns false .

警告： This function must not be called until the QApplication object has been created.

bool QGLFormat:: hasOverlay () const

返回 true if overlay plane is enabled; otherwise returns false .

Overlay is disabled by default.

另请参阅 setOverlay ().

int QGLFormat:: majorVersion () const

Returns the OpenGL major version.

该函数在 Qt 4.7 引入。

另请参阅 setVersion () 和 minorVersion ().

int QGLFormat:: minorVersion () const

Returns the OpenGL minor version.

该函数在 Qt 4.7 引入。

另请参阅 setVersion () 和 majorVersion ().

[static] OpenGLVersionFlags QGLFormat:: openGLVersionFlags ()

Identifies, at runtime, which OpenGL versions that are supported by the current platform.

Note that if OpenGL version 1.5 is supported, its predecessors (i.e., version 1.4 and lower) are also supported. To identify the support of a particular feature, like multi texturing, test for the version in which the feature was first introduced (i.e., version 1.3 in the case of multi texturing) to adapt to the largest possible group of runtime platforms.

This function needs a valid current OpenGL context to work; otherwise it will return OpenGL_Version_None .

该函数在 Qt 4.2 引入。

另请参阅 hasOpenGL () 和 hasOpenGLOverlays ().

int QGLFormat:: plane () const

Returns the plane of this format. The default for normal formats is 0, which means the normal plane. The default for overlay formats is 1, which is the first overlay plane.

另请参阅 setPlane () 和 defaultOverlayFormat ().

OpenGLContextProfile QGLFormat:: profile () const

Returns the OpenGL context profile.

该函数在 Qt 4.7 引入。

另请参阅 setProfile ().

int QGLFormat:: redBufferSize () const

Returns the red buffer size.

该函数在 Qt 4.2 引入。

另请参阅 setRedBufferSize ().

bool QGLFormat:: rgba () const

返回 true if RGBA color mode is set. Returns false if color index mode is set. The default color mode is RGBA.

另请参阅 setRgba ().

bool QGLFormat:: sampleBuffers () const

返回 true if multisample buffer support is enabled; otherwise returns false .

The multisample buffer is disabled by default.

另请参阅 setSampleBuffers ().

int QGLFormat:: samples () const

Returns the number of samples per pixel when multisampling is enabled. By default, the highest number of samples that is available is used.

另请参阅 setSampleBuffers (), sampleBuffers ()，和 setSamples ().

void QGLFormat:: setAccum ( bool enable )

若 enable is true enables the accumulation buffer; otherwise disables the accumulation buffer.

The accumulation buffer is disabled by default.

The accumulation buffer is used to create blur effects and multiple exposures.

另请参阅 accum () 和 setAccumBufferSize ().

void QGLFormat:: setAccumBufferSize ( int size )

Set the preferred accumulation buffer size, where size is the bit depth for each RGBA component.

另请参阅 accum (), setAccum ()，和 accumBufferSize ().

void QGLFormat:: setAlpha ( bool enable )

若 enable is true enables the alpha buffer; otherwise disables the alpha buffer.

The alpha buffer is disabled by default.

The alpha buffer is typically used for implementing transparency or translucency. The A in RGBA specifies the transparency of a pixel.

另请参阅 alpha () 和 setAlphaBufferSize ().

void QGLFormat:: setAlphaBufferSize ( int size )

Set the preferred alpha buffer size to size . This function implicitly enables the alpha channel.

另请参阅 setRedBufferSize (), setGreenBufferSize ()，和 alphaBufferSize ().

void QGLFormat:: setBlueBufferSize ( int size )

Set the preferred blue buffer size to size .

该函数在 Qt 4.2 引入。

另请参阅 blueBufferSize (), setRedBufferSize (), setGreenBufferSize ()，和 setAlphaBufferSize ().

[static] void QGLFormat:: setDefaultFormat (const QGLFormat & f )

Sets a new default QGLFormat for the application to f . For example, to set single buffering as the default instead of double buffering, your main() might contain code like this:

QApplication a(argc, argv);
QGLFormat f;
f.setDoubleBuffer(false);
QGLFormat::setDefaultFormat(f);
					

另请参阅 defaultFormat ().

[static] void QGLFormat:: setDefaultOverlayFormat (const QGLFormat & f )

Sets a new default QGLFormat for overlay contexts to f . This format is used whenever a QGLWidget is created with a format that hasOverlay () enabled.

For example, to get a double buffered overlay context (if available), use code like this:

QGLFormat f = QGLFormat::defaultOverlayFormat();
f.setDoubleBuffer(true);
QGLFormat::setDefaultOverlayFormat(f);
					

As usual, you can find out after widget creation whether the underlying OpenGL system was able to provide the requested specification:

// ...continued from above
MyGLWidget* myWidget = new MyGLWidget(QGLFormat(QGL::HasOverlay), ...);
if (myWidget->format().hasOverlay()) {
    // Yes, we got an overlay, let's check _its_ format:
    QGLContext* olContext = myWidget->overlayContext();
    if (olContext->format().doubleBuffer())
        ; // yes, we got a double buffered overlay
    else
        ; // no, only single buffered overlays are available
}
					

另请参阅 defaultOverlayFormat ().

void QGLFormat:: setDepth ( bool enable )

若 enable is true enables the depth buffer; otherwise disables the depth buffer.

The depth buffer is enabled by default.

The purpose of a depth buffer (or Z-buffering) is to remove hidden surfaces. Pixels are assigned Z values based on the distance to the viewer. A pixel with a high Z value is closer to the viewer than a pixel with a low Z value. This information is used to decide whether to draw a pixel or not.

另请参阅 depth () 和 setDepthBufferSize ().

void QGLFormat:: setDepthBufferSize ( int size )

Set the minimum depth buffer size to size .

另请参阅 depthBufferSize (), setDepth ()，和 depth ().

void QGLFormat:: setDirectRendering ( bool enable )

若 enable is true enables direct rendering; otherwise disables direct rendering.

Direct rendering is enabled by default.

Enabling this option will make OpenGL bypass the underlying window system and render directly from hardware to the screen, if this is supported by the system.

另请参阅 directRendering ().

void QGLFormat:: setDoubleBuffer ( bool enable )

若 enable is true sets double buffering; otherwise sets single buffering.

Double buffering is enabled by default.

Double buffering is a technique where graphics are rendered on an off-screen buffer and not directly to the screen. When the drawing has been completed, the program calls a swapBuffers() function to exchange the screen contents with the buffer. The result is flicker-free drawing and often better performance.

Note that single buffered contexts are currently not supported with EGL.

另请参阅 doubleBuffer (), QGLContext::swapBuffers ()，和 QGLWidget::swapBuffers ().

void QGLFormat:: setGreenBufferSize ( int size )

Set the preferred green buffer size to size .

该函数在 Qt 4.2 引入。

另请参阅 greenBufferSize (), setRedBufferSize (), setBlueBufferSize ()，和 setAlphaBufferSize ().

void QGLFormat:: setOption ( QGL::FormatOptions opt )

Sets the format option to opt .

另请参阅 testOption ().

void QGLFormat:: setOverlay ( bool enable )

若 enable is true enables an overlay plane; otherwise disables the overlay plane.

Enabling the overlay plane will cause QGLWidget to create an additional context in an overlay plane. See the QGLWidget documentation for further information.

另请参阅 hasOverlay ().

void QGLFormat:: setPlane ( int plane )

Sets the requested plane to plane . 0 is the normal plane, 1 is the first overlay plane, 2 is the second overlay plane, etc.; -1, -2, etc. are underlay planes.

Note that in contrast to other format specifications, the plane specifications will be matched exactly. This means that if you specify a plane that the underlying OpenGL system cannot provide, an invalid QGLWidget will be created.

另请参阅 plane ().

void QGLFormat:: setProfile ( OpenGLContextProfile profile )

Set the OpenGL context profile to profile 。 profile is ignored if the requested OpenGL version is less than 3.2.

该函数在 Qt 4.7 引入。

另请参阅 profile ().

void QGLFormat:: setRedBufferSize ( int size )

Set the preferred red buffer size to size .

该函数在 Qt 4.2 引入。

另请参阅 redBufferSize (), setGreenBufferSize (), setBlueBufferSize ()，和 setAlphaBufferSize ().

void QGLFormat:: setRgba ( bool enable )

若 enable is true sets RGBA mode. If enable is false sets color index mode.

The default color mode is RGBA.

RGBA is the preferred mode for most OpenGL applications. In RGBA color mode you specify colors as red + green + blue + alpha quadruplets.

In color index mode you specify an index into a color lookup table.

另请参阅 rgba ().

void QGLFormat:: setSampleBuffers ( bool enable )

若 enable is true, a GL context with multisample buffer support is picked; otherwise ignored.

另请参阅 sampleBuffers (), setSamples ()，和 samples ().

void QGLFormat:: setSamples ( int numSamples )

Set the preferred number of samples per pixel when multisampling is enabled to numSamples . By default, the highest number of samples available is used.

另请参阅 setSampleBuffers (), sampleBuffers ()，和 samples ().

void QGLFormat:: setStencil ( bool enable )

若 enable is true enables the stencil buffer; otherwise disables the stencil buffer.

The stencil buffer is enabled by default.

The stencil buffer masks certain parts of the drawing area so that masked parts are not drawn on.

另请参阅 stencil () 和 setStencilBufferSize ().

void QGLFormat:: setStencilBufferSize ( int size )

将首选蜡纸缓冲大小设为 size .

另请参阅 stencilBufferSize (), setStencil ()，和 stencil ().

void QGLFormat:: setStereo ( bool enable )

若 enable is true enables stereo buffering; otherwise disables stereo buffering.

默认情况下，立体缓冲是禁用的。

Stereo buffering provides extra color buffers to generate left-eye and right-eye images.

另请参阅 stereo ().

void QGLFormat:: setSwapInterval ( int interval )

Set the preferred swap interval. This can be used to sync the GL drawing into a system window to the vertical refresh of the screen. Setting an interval value of 0 will turn the vertical refresh syncing off, any value higher than 0 will turn the vertical syncing on.

Under Windows and under X11, where the WGL_EXT_swap_control and GLX_SGI_video_sync extensions are used, the interval parameter can be used to set the minimum number of video frames that are displayed before a buffer swap will occur. In effect, setting the interval to 10, means there will be 10 vertical retraces between every buffer swap.

Under Windows the WGL_EXT_swap_control extension has to be present, and under X11 the GLX_SGI_video_sync extension has to be present.

该函数在 Qt 4.2 引入。

另请参阅 swapInterval ().

void QGLFormat:: setVersion ( int major , int minor )

Set the OpenGL version to the major and minor numbers. If a context compatible with the requested OpenGL version cannot be created, a context compatible with version 1.x is created instead.

该函数在 Qt 4.7 引入。

另请参阅 majorVersion () 和 minorVersion ().

bool QGLFormat:: stencil () const

返回 true if the stencil buffer is enabled; otherwise returns false. The stencil buffer is enabled by default.

另请参阅 setStencil () 和 setStencilBufferSize ().

int QGLFormat:: stencilBufferSize () const

Returns the stencil buffer size.

另请参阅 stencil (), setStencil ()，和 setStencilBufferSize ().

bool QGLFormat:: stereo () const

返回 true if stereo buffering is enabled; otherwise returns false. Stereo buffering is disabled by default.

另请参阅 setStereo ().

int QGLFormat:: swapInterval () const

Returns the currently set swap interval. -1 is returned if setting the swap interval isn't supported in the system GL implementation.

该函数在 Qt 4.2 引入。

另请参阅 setSwapInterval ().

bool QGLFormat:: testOption ( QGL::FormatOptions opt ) const

返回 true if format option opt 已设置；否则返回 false .

另请参阅 setOption ().

[static] QSurfaceFormat QGLFormat:: toSurfaceFormat (const QGLFormat & format )

Returns a window format for the OpenGL format specified by format .

QGLFormat &QGLFormat:: operator= (const QGLFormat & other )

赋值 other 到此对象。

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bool operator!= (const QGLFormat & a , const QGLFormat & b )

返回 false if all the options of the two QGLFormat objects a and b 相等；否则返回 true .

bool operator== (const QGLFormat & a , const QGLFormat & b )

返回 true if all the options of the two QGLFormat objects a and b 相等；否则返回 false .