Qt 6 是努力使框架更高效，且更易于使用的结果。
为兼容每个发行的所有公共 API，我们试着维护二进制和源代码。但是，为使 Qt 成为更优框架，一些改变是不可避免的。
In this topic we summarize those changes in Qt OpenGL , and provide guidance to handle them.
The Qt OpenGL module was deprecated for the life time of Qt 5, and the classes it contained have been removed in Qt 6.
This refers specifically to the classes prefixed by
QGL
.
In Qt 5, a replacement set of OpenGL-support classes were added to Qt Gui. This was in order to support OpenGL as the cross-platform graphics API that served as foundation for graphics in Qt.
In Qt 6, these have been migrated to the Qt OpenGL module. They are still usable and fully supported for applications depending on OpenGL directly. However, they are no longer considered foundational, since Qt has been extended to support other graphics APIs in its foundation, such as Direct3D, Metal and Vulkan.
Existing application code will largely continue working, but should now include Qt OpenGL in project files, as well as include the headers if these were previously included indirectly through Qt Gui.
注意： A notable exception is QOpenGLContext , which still resides in Qt Gui.
Another exception is the
QOpenGLWidget
class. This has been moved to a new module named
Qt OpenGL Widgets
and should be included from there.
In addition to adjusting project files and including headers, the application should also manually set the rendering backend to OpenGL in order to use this functionality when working with Qt Quick. By default, Qt will use the most appropriate graphics API on the target platform. See the RHI rendering documentation 了解更多细节。
On Windows, ANGLE, a third-party OpenGL ES to Direct 3D translator, is no longer included in Qt 6. This means
Qt::AA_UseOpenGLES
and the environment variable
QT_OPENGL=angle
no longer has any effect. In 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 runtime. However, the use of 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, Qt 6 defaults to Direct 3D, therefore the effect of the removal of ANGLE is lessened by the addition of support to other graphics APIs.
