The QPlatformOpenGLContext class provides an abstraction for native GL contexts. More...

#include <qplatformopenglcontext.h>

Inheritance diagram for QPlatformOpenGLContext:

Collaboration diagram for QPlatformOpenGLContext:

Public Member Functions
	QPlatformOpenGLContext ()

virtual	~QPlatformOpenGLContext ()

virtual void	initialize ()
	Called after a new instance is constructed.

virtual QSurfaceFormat	format () const =0

virtual void	swapBuffers (QPlatformSurface *surface)=0
	Reimplement in subclass to native swap buffers calls.

virtual GLuint	defaultFramebufferObject (QPlatformSurface *surface) const
	Reimplement in subclass if your platform uses framebuffer objects for surfaces.

virtual bool	makeCurrent (QPlatformSurface *surface)=0

virtual void	doneCurrent ()=0

virtual void	beginFrame ()
	Called when the RHI begins rendering a new frame in the context.

virtual void	endFrame ()
	Called when the RHI ends rendering a in the context.

virtual bool	isSharing () const

virtual bool	isValid () const

virtual QFunctionPointer	getProcAddress (const char *procName)=0
	Reimplement in subclass to allow dynamic querying of OpenGL symbols.

QOpenGLContext *	context () const

Static Public Member Functions
static bool	parseOpenGLVersion (const QByteArray &versionString, int &major, int &minor)

Friends
class	QOpenGLContext

class	QOpenGLContextPrivate

Detailed Description

The QPlatformOpenGLContext class provides an abstraction for native GL contexts.

Since: 4.8

\preliminary

In QPA the way to support OpenGL or OpenVG or other technologies that requires a native GL context is through the QPlatformOpenGLContext wrapper.

There is no factory function for QPlatformOpenGLContexts, but rather only one accessor function. The only place to retrieve a QPlatformOpenGLContext from is through a QPlatformWindow.

The context which is current for a specific thread can be collected by the currentContext() function. This is how QPlatformOpenGLContext also makes it possible to use the Qt GUI module withhout using QOpenGLWidget. When using QOpenGLContext::currentContext(), it will ask QPlatformOpenGLContext for the currentContext. Then a corresponding QOpenGLContext will be returned, which maps to the QPlatformOpenGLContext.

Definition at line 33 of file qplatformopenglcontext.h.

Constructor & Destructor Documentation

◆ QPlatformOpenGLContext()

QPlatformOpenGLContext::QPlatformOpenGLContext ( )

Definition at line 53 of file qplatformopenglcontext.cpp.

◆ ~QPlatformOpenGLContext()

QPlatformOpenGLContext::~QPlatformOpenGLContext ( )

virtual

Definition at line 58 of file qplatformopenglcontext.cpp.

Member Function Documentation

◆ beginFrame()

void QPlatformOpenGLContext::beginFrame ( )

virtual

Called when the RHI begins rendering a new frame in the context.

Will always be paired with a call to \l endFrame().

Reimplemented in QtWaylandClient::QWaylandGLContext.

Definition at line 136 of file qplatformopenglcontext.cpp.

◆ context()

QOpenGLContext * QPlatformOpenGLContext::context ( ) const

Definition at line 82 of file qplatformopenglcontext.cpp.

References d.

Referenced by QtWaylandClient::DecorationsBlitter::DecorationsBlitter(), QGLXContext::QGLXContext(), QWindowsGLContext::QWindowsGLContext(), QtWaylandClient::DecorationsBlitter::blit(), QCocoaGLContext::initialize(), QWindowsGLContext::isSharing(), QWasmOpenGLContext::makeCurrent(), QtWaylandClient::QWaylandGLContext::makeCurrent(), and QGLXContext::queryDummyContext().

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◆ defaultFramebufferObject()

GLuint QPlatformOpenGLContext::defaultFramebufferObject ( QPlatformSurface * surface ) const

virtual

Reimplement in subclass if your platform uses framebuffer objects for surfaces.

The default implementation returns 0.

Reimplemented in QIOSContext, QWasmOpenGLContext, and QtWaylandClient::QWaylandGLContext.

Definition at line 77 of file qplatformopenglcontext.cpp.

Referenced by QWasmOpenGLContext::defaultFramebufferObject().

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◆ doneCurrent()

virtual void QPlatformOpenGLContext::doneCurrent ( )

pure virtual

Implemented in QEGLPlatformContext, QCocoaGLContext, QIOSContext, QQnxGLContext, QWasmOpenGLContext, QWindowsGLContext, QXcbEglContext, QGLXContext, QtWaylandClient::QWaylandBrcmGLContext, and QtWaylandClient::QWaylandGLContext.

◆ endFrame()

void QPlatformOpenGLContext::endFrame ( )

virtual

Called when the RHI ends rendering a in the context.

Is always preceded by a call to \l beginFrame().

Reimplemented in QtWaylandClient::QWaylandGLContext.

Definition at line 144 of file qplatformopenglcontext.cpp.

◆ format()

virtual QSurfaceFormat QPlatformOpenGLContext::format ( ) const

pure virtual

Implemented in QEGLPlatformContext, QCocoaGLContext, QIOSContext, QWasmOpenGLContext, QWindowsGLContext, QGLXContext, and QtWaylandClient::QWaylandBrcmGLContext.

◆ getProcAddress()

QFunctionPointer QPlatformOpenGLContext::getProcAddress ( const char * procName )

pure virtual

Reimplement in subclass to allow dynamic querying of OpenGL symbols.

As opposed to e.g. the wglGetProcAddress function on Windows, Qt expects this methods to be able to return valid function pointers even for standard OpenGL symbols.

Implemented in QEGLPlatformContext, QCocoaGLContext, QIOSContext, QWasmOpenGLContext, QWindowsGLContext, QGLXContext, QtWaylandClient::QWaylandBrcmGLContext, and QtWaylandClient::QWaylandGLContext.