diff options
| author | Laszlo Agocs <laszlo.agocs@digia.com> | 2015-01-12 16:52:05 +0100 |
|---|---|---|
| committer | Laszlo Agocs <laszlo.agocs@theqtcompany.com> | 2015-01-22 14:16:50 +0100 |
| commit | 2bc038adc905497891294019007fcf0bf85f5638 (patch) | |
| tree | 34f043e777b522dc1f0c098301371df2159770de /src/gui/kernel/qopenglcontext.cpp | |
| parent | a2b358e7f5f46472d21d4ea24ec0c2646bc51cc7 (diff) | |
Expose context loss
On platforms like Windows (and presumably on mobile devices too)
the loss of the context (e.g. the underlying D3D device in case of
ANGLE) is an event that can happen randomly and needs sufficient
handling.
Enhance QOpenGLContext::isValid() with the purpose of indicating
context loss.
Currently only the Windows EGL backend (ANGLE) has support for it.
Other platforms may be added later.
Task-number: QTBUG-43263
Change-Id: I8177694c1ee7cebbd5d330e34757fd94c563e6d6
Reviewed-by: Friedemann Kleint <Friedemann.Kleint@theqtcompany.com>
Diffstat (limited to 'src/gui/kernel/qopenglcontext.cpp')
| -rw-r--r-- | src/gui/kernel/qopenglcontext.cpp | 13 |
1 files changed, 11 insertions, 2 deletions
diff --git a/src/gui/kernel/qopenglcontext.cpp b/src/gui/kernel/qopenglcontext.cpp index 3fccd6ba9a..90e9235353 100644 --- a/src/gui/kernel/qopenglcontext.cpp +++ b/src/gui/kernel/qopenglcontext.cpp @@ -590,10 +590,10 @@ QVariant QOpenGLContext::nativeHandle() const */ bool QOpenGLContext::create() { - if (isValid()) + Q_D(QOpenGLContext); + if (d->platformGLContext) destroy(); - Q_D(QOpenGLContext); d->platformGLContext = QGuiApplicationPrivate::platformIntegration()->createPlatformOpenGLContext(this); if (!d->platformGLContext) return false; @@ -676,6 +676,15 @@ QOpenGLContext::~QOpenGLContext() /*! Returns if this context is valid, i.e. has been successfully created. + On some platforms the return value of \c false for a context that was + successfully created previously indicates that the OpenGL context was lost. + + The typical way to handle context loss scenarios in applications is to + check via this function whenever makeCurrent() fails and returns \c false. + If this function then returns \c false, recreate the underlying native + OpenGL context by calling create(), call makeCurrent() again and then + reinitialize all OpenGL resources. + \sa create() */ bool QOpenGLContext::isValid() const |