Error while trying to add QOpenGlWidget to a QWidget

sara123

Hello!

I am trying to implement QopenglWidget inside a QWidget by using the addWidget() function to insert the openGl window into the layout. Unfortunately the program crashes and I get this error. Can someone explain me what the reason behind this might be..

This is the constructor of the Qwidget where I try to insert the opengl widget.
game::game()
{

GlWindow_obj = new GlWindow(this);
GlWindow_obj->installEventFilter(this);
KeyPressesHandler_obj = new KeyPressesHandler;


QGridLayout *layout = new QGridLayout;
layout->addWidget(GlWindow_obj, 0, 1);
setLayout(layout);

}
Thank you in advance.

mrjj

Hi and welcome to the forums
Im not sure GLWindow likes to be put inside another Widget

Is there a reason you cant use
https://doc.qt.io/qt-5/qopenglwidget.html#details

Since it complains about the context.
You could try to use
QCoreApplication::setAttribute(Qt::AA_ShareOpenGLContexts);
and see if that makes it happy.

sara123

@sara123 said in Error while trying to add QOpenGlWidget to a QWidget:

GlWindow

Thank you very much.
Actually there is a mistake in the naming that I am using for my openGl subclass, as I called it GlWindow. This is because I used to use QOpenGlWindow at the beginning but I changed it at some point to QOpenGlWidget as seen in the following code:

class GlWindow : public QOpenGLWidget, protected QOpenGLFunctions
{
Q_OBJECT

public:
    GlWindow(QWidget *parent = nullptr);
    ~GlWindow();

    void Init();
    void PaintTetrisShape(QVector<TetrisShape*> container);
    void PaintSmth();

private:

    TetrisShape *shape;
    QVector<TetrisShape*> _shapeContainer;

protected:
    void resizeGL(int width, int height) override;
    void paintGL() override;
    void initializeGL() override;

};

mrjj

@sara123
Hi
Ah, so it is the widget version.
Then I see no reason it should crash being inserted into a layout.

If you just create an instance of it, does it then work fine?

Im wondering if its all setup as expected since it crashes here

static QOpenGLFunctionsPrivateEx *qt_gl_functions(QOpenGLContext *context = 0)
{
    if (!context)
        context = QOpenGLContext::currentContext();
    Q_ASSERT(context);
    QOpenGLFunctionsPrivateEx *funcs =
        qt_gl_functions_resource()->value<QOpenGLFunctionsPrivateEx>(context);
    return funcs;
}

So it seems related to getting the context.

gde23

It seems that you did not init you openGL functions corretyl.
Did you call initializeOpenGLFunctions(); somewhere int the init/constructor?

As a test you could also take the OpenGlWidget example from Qt creator and set it to your layout to see if that runs. (Cube OpenGL Example)