QT QPainter Issue

[d.jurin]

Hi guys!

Standard QT QPainter class doesn't work!

Code: Select all

void GLWidget::paintEvent(QPaintEvent *event){
     QPainter painter(this);
}

Error:
Vertex shader for simpleShaderProg (MainVertexShader & PositionOnlyVertexShader) failed to compile
Fragment shader for simpleShaderProg (MainFragmentShader & ShockingPinkSrcFragmentShader) failed to compile
QGLShaderProgram: shader programs are not supported
Segmentation fault


You can meet this problem also with the standard QT openGL Examples:

/usr/lib64/qt4/examples/opengl/2dpainting (http://doc.qt.nokia.com/latest/opengl-2dpainting.html)
/usr/lib64/qt4/examples/opengl/overpainting (http://doc.qt.nokia.com/latest/opengl-overpainting.html)

and some others that use QPainter class.

So I am using openSuse x64 guests with latest VB 4.0.10 and latest GA under Windows 7 x86 host. I have tested this problem on openSuse 11.3, 11.4, 12.1ms2 guests with different QT versions 4.6, 4.7, 4.8, but without success, the same problem everywhere. But on openSuse x86 11.1 guest with QT 4.3 it partially works! The problem does not occur at all on linux hosts, so under any non virtualized openSuse with any QT version QPainter class is working fine.

I am developing QT GL visualization program and I need put some text over my 3d, but I am not able to do it since this issue!

Thanks in advance!

[d.jurin]

So it has no sense to ask about it on QT site, since the problem is absent on linux without virtualiztion. It is definitely the problem of VirtualBox! And this problem leads to the crush of a bunch of QT applications.

QPainter functionality based on openGL 2 (http://doc.qt.nokia.com/latest/qpainter.html). Maybe VB doesn't support openGL 2 properly?

Maybe someone has other ideas?

[d.jurin]

Oh gods! Why nobody reply? Of course it's bit complicated then problems with shared folders... But look, this problem leads to crush all QT apps that put a text over GL graphics !!! Defenetly there is a strong bug in the support of basic GL functionality by VB!

Please fix it !!! Or please put it in the bugs report!

[Perryg]

You should submit this yourself bugtracker since it is affecting you.

[d.jurin]

I have submitted the bug ticket on this issue:

http://www.virtualbox.org/ticket/9198#preview

Let's see how this develops. Thanks a lot for help!