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Document that ANGLE is gone from QtGui

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Text taken out of the source-breaks.qdoc file, which will be
removed.

Task-number: QTBUG-88152
Change-Id: Ibe5fe5328151358873c26d8f1eacc30027c2ced9
Reviewed-by: Laszlo Agocs <laszlo.agocs@qt.io>
This commit is contained in:
Volker Hilsheimer 2020-11-17 16:26:36 +01:00
parent 26e41291bb
commit 781ae0b9f1
1 changed files with 15 additions and 0 deletions
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src/gui/doc/src/qt6-changes.qdoc
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@ -117,4 +117,19 @@
In addition, the class \l QOpenGLWidget has been moved to a new module, named
Qt OpenGL Widgets.
\section2 ANGLE
On Windows, ANGLE, a third-party OpenGL ES to Direct 3D translator, is no
longer included in Qt. This means Qt::AA_UseOpenGLES and the environment
variable \c{QT_OPENGL=angle} no longer have any effect. In \l{Qt for Windows -
Requirements}{dynamic OpenGL builds} there is no automatic fallback to ANGLE in
case OpenGL proper fails to initialize. For QWindow or QWidget based
applications using OpenGL directly, for example via QOpenGLWidget, this means
that OpenGL proper is the only option at run time. However, the alternative of
using a pure software OpenGL implementation, such as Mesa llvmpipe that is
shipped with the pre-built Qt packages, is still available. For Qt Quick and Qt
Quick 3D applications, Qt 6 introduces support for Direct 3D 11, Vulkan, and
Metal, in addition to OpenGL. On Windows the default choice is Direct 3D,
therefore the removal of ANGLE is alleviated by having support for graphics
APIs other than OpenGL as well.
*/