Avoid the initializeOpenGLFunctions() call after versionFunctions()

Try making it compatible with QOpenGLContext::functions() which returns
an already initialized QOpenGLFunctions.

Unfortunately we cannot make them 100% compatible because functions()
conveniently requires that the context (or a sharing context) is current.
versionFunctions() has no such requirement and we cannot safely introduce
it anymore.

What we can do is to state that as long as the context is the current one,
the initializeOpenGLFunctions() call can be omitted. If another context (or
no context) is current, the call will still be needed, like it is today.

Also, we require that the exact same context is current. Sharing does not
count since the exact behavior of sharing contexts with different versions
is unknown.

[ChangeLog][QtGui] initializeOpenGLFunctions() no longer needs to be called when
querying a versioned function wrapper object via QOpenGLContext::versionFunctions().

Change-Id: I0b4d1ae1f780da3f5dec9fc8dc67255c13faab6e
Reviewed-by: Sean Harmer <[email protected]>

0 files changed, 0 insertions, 0 deletions