[Qt 4.6.3/OpenGL 4.1] : Unrecognized OpenGL

Hi,

I'm encountering a problem with integrating a QGLWidget.

The message "Unrecognized OpenGL" appears on console.
And glGetString always returns NULL.

My graphic driver is up-to-date.

I success in compiling and running a trivial openGL program and glGetStrings works well.

Someone can tell me what to do ?
Thanks a lot.:)

Quote:

---

Originally Posted by didier

Hi,

I'm encountering a problem with integrating a QGLWidget.

The message "Unrecognized OpenGL" appears on console.
And glGetString always returns NULL.

My graphic driver is up-to-date.

I success in compiling and running a trivial openGL program and glGetStrings works well.

Someone can tell me what to do ?
Thanks a lot.:)

---

Are you using overpainting with the QGLWidget?

Quote:

---

Originally Posted by Dong Back Kim

Are you using overpainting with the QGLWidget?

---

A this time, no. I have just written this piece of code.

Code:

---

class GLWidget :public QGLWidget
{
Q_OBJECT
   public:
   GLWidget(QWidget* argParent = 0,
            const QGLWidget* argShareWidget = 0,
            Qt::WindowFlags argFlags = 0 );
 
    signals:
    void sizeChanges(QSize const&);
    void doubleClick(QPoint const&);
    void click(QPoint const&);
 
    protected:
    void initializeGL();
    void resizeGL(int argWidth, int argHeight);
    void mouseDoubleClickEvent(QMouseEvent* event);
    void mouseReleaseEvent(QMouseEvent* event);
    void paintGL();
 
};

---

Code:

---

#include "../include/GLWidget.h"
 
GLWidget::GLWidget(QWidget* argParent,
                    const QGLWidget* argShareWidget,
                    Qt::WindowFlags argFlags)
 
                    :QGLWidget(argParent,
                               argShareWidget,
                               argFlags)
{
}
 
void GLWidget::initializeGL()
{
}
 
void GLWidget::resizeGL(int argWidth, int argHeight)
{
   emit sizeChanges(QSize(argWidth, argHeight));
}
 
 
void GLWidget::paintGL()
{
}
 
void GLWidget::mouseDoubleClickEvent(QMouseEvent* event)
{
emit doubleClick(event->pos());
}
 
void GLWidget::mouseReleaseEvent(QMouseEvent* event)
{
   emit click(event->pos());
}

---

I've believed, an instant, it's because my OpenGL implementation is 4.1 and Qt 4.6.3 wouldn't recognize OpenGL 4.1 because of enum QGLFormat::OpenGLVersionFlag's definition.

About glGetString(). The problem is over. I've discovered glContext is inititialized in after QGLWidget() constructor. In paintGL(), it works well.

Quote:

---

Originally Posted by didier

A this time, no. I have just written this piece of code.

Code:

---

class GLWidget :public QGLWidget
{
Q_OBJECT
   public:
   GLWidget(QWidget* argParent = 0,
            const QGLWidget* argShareWidget = 0,
            Qt::WindowFlags argFlags = 0 );
 
    signals:
    void sizeChanges(QSize const&);
    void doubleClick(QPoint const&);
    void click(QPoint const&);
 
    protected:
    void initializeGL();
    void resizeGL(int argWidth, int argHeight);
    void mouseDoubleClickEvent(QMouseEvent* event);
    void mouseReleaseEvent(QMouseEvent* event);
    void paintGL();
 
};

---

Code:

---

#include "../include/GLWidget.h"
 
GLWidget::GLWidget(QWidget* argParent,
                    const QGLWidget* argShareWidget,
                    Qt::WindowFlags argFlags)
 
                    :QGLWidget(argParent,
                               argShareWidget,
                               argFlags)
{
}
 
void GLWidget::initializeGL()
{
}
 
void GLWidget::resizeGL(int argWidth, int argHeight)
{
   emit sizeChanges(QSize(argWidth, argHeight));
}
 
 
void GLWidget::paintGL()
{
}
 
void GLWidget::mouseDoubleClickEvent(QMouseEvent* event)
{
emit doubleClick(event->pos());
}
 
void GLWidget::mouseReleaseEvent(QMouseEvent* event)
{
   emit click(event->pos());
}

---

I've believed, an instant, it's because my OpenGL implementation is 4.1 and Qt 4.6.3 wouldn't recognize OpenGL 4.1 because of enum QGLFormat::OpenGLVersionFlag's definition.

About glGetString(). The problem is over. I've discovered glContext is inititialized in after QGLWidget() constructor. In paintGL(), it works well.

---

Good to know about QGLFormat::OpenGLVersionFlag.