QOpenGLContext does not works in debug with QtCreator 4.7

Roy44

Hi,
I update Qt creator to version 4.7 (windows) and know my application does not work correctly because QOpenGLContext seems dont' work in debug now.

In Qt Creator 4.6 I had no problem

QSurfaceFormat format;
        format.setMajorVersion(10);
        format.setProfile(QSurfaceFormat::CoreProfile);
        QOffscreenSurface offscreen;
        offscreen.setFormat(format);
        offscreen.create();
        QOpenGLContext ctxt;
        ctxt.setFormat(format);
        ctxt.create();
        QOpenGLContext* pCurrent = QOpenGLContext::currentContext();

        if(ctxt.makeCurrent(&offscreen))
        {
//
        }

works well with Qt creator 4.6, in 4.7 pCurrent is null and make current return false.
The problem is only in debug mode
in realease it works fine.
Is it a known bug.
How can I return to version 4.6 ?
thanks.

mrjj

hi
But Qt Creator is a Text editor. its not the Qt version.
Did you also upgrade your Qt ?

SGaist

Hi,

You can check the bug report system to see if there's something related.

As for older versions of Qt Creator, you can find them here.

Roy44

I said QtCreator, I mean the Qt CDB debugger 4.7, I'm currently in Qt 5.11.0 I will update to 5.11.1

Roy44

same trouble in Qt 5.11.1

Roy44

I made a test:

MainWindow::MainWindow(QWidget *parent) :
    QMainWindow(parent),
    ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    QString openGLVers;
    QString openGLVendor;
    QString openGLRenderer;
    QString openGLExtension;


    QSurfaceFormat format;
    format.setMajorVersion(4);
    format.setProfile(QSurfaceFormat::CoreProfile);
    QOffscreenSurface offscreen;
    offscreen.setFormat(format);
    offscreen.create();
    QOpenGLContext ctxt;
    ctxt.setFormat(format);
    ctxt.create();
    QOpenGLContext* pCurrent = QOpenGLContext::currentContext();

    if(ctxt.makeCurrent(&offscreen))
    {
        openGLVers = QString((char*)ctxt.functions()->glGetString(GL_VERSION));
        openGLVendor = QString((char*)ctxt.functions()->glGetString(GL_VENDOR));
        openGLExtension = QString((char*)ctxt.functions()->glGetString(GL_EXTENSIONS));
        openGLRenderer =  QString((char*)ctxt.functions()->glGetString(GL_RENDERER));

        qDebug() << openGLVers;
        qDebug() << openGLVendor;
        qDebug() << openGLExtension;
        qDebug() << openGLRenderer;

        ui->lblRenderer->setText(openGLRenderer);
        ui->lblVendor->setText(openGLVendor);
        ui->lblVer->setText(openGLVers);
    }
}

Doest not work in debug and release (if launch from QtCreator)
I have error QWindowsEGLContext: Failed to create context, eglError: 3005, this: 0x5ac3470

If I launch my small exe from explorer It works.

Roy44

I confirm it's a bug (I rebuild with QtCreator 4.6.2 and it's works).
thanks for the link to QtCreator 4.6.2

mrjj

@Roy44
But still Qt 5.11.1 ?

Roy44

I'm stll in Qt 5.11.1.

Roy44

I found a similar problem here
https://forum.qt.io/topic/92780/shader-fails-to-compile-after-upgrading-to-qt-creator-4-7/6

And the same solution solve my problem.