QOpenGLFunctions_3_3_Core Incorrectly Assumes it Has Been Initialized

[JMO_GS]

I've got a Widget derived from QOpenGLWidget and QOpenGLFunctions_3_3_Core

 class MyWidget : public QOpenGLWidget, 
                     protected QOpenGLFunctions_3_3_Core
{
    Q_OBJECT

Sometimes my application never shows it. Consequently, my initializeGL override is never called and therefore I never call QOpenGLFunctions_3_3_Core::InitializeOpenGL. So QOpenGLFunctions_3_3_Core never initializes its backend pointers.

That would be fine, but the problem is that when QOpenGLFunctions_3_3_Core is destroyed, it accesses these pointers as if they HAD been initialized

QOpenGLFunctions_3_3_Core::~QOpenGLFunctions_3_3_Core()
{
    if (d_1_0_Core)
        d_1_0_Core->refs.deref();
    Q_ASSERT(d_1_0_Core->refs.load());  // BAD!!!  BAD!!!! CRASH!!!

So whenever I run a DEBUG build, my app crashes on shutdown.. d_1_0_Core was never initialized. The ASSERT assumes it is valid --> Crash. Even though the line just above was checking for NULL.

I'm assuming this is a Qt bug, right Is this correct? Is it something I should report? Or have I failed to follow some protocol?

(I realize I can, if necessary, cause Paint to be called. I don't want to. I shouldn't have to).

Appreciate any responses

-Joe

[SGaist]

Hi and welcome to devnet,

Which version of Qt are you using ?

[JMO_GS]

@SGaist Hi, Thanks for answering. Currently I am using Qt 5.7

[SGaist]

This has already been fixed in the dev branch

[JMO_GS]

Excellent. Fortunately this only affects debug builds and only on shutdown so I guess I can wait for the next release. Thanks for the info