How to make multiple QGLWidgets share the same QGLContext?

[zhaopeng]

You mean the sharing of QGLContext follows the latest OpenGL specification, right? Now it's clear and I can rest to use it. Thanks a lot!

[tilsitt]

[quote author="zhaopeng" date="1356080913"]You mean the sharing of QGLContext follows the latest OpenGL specification, right?[/quote]

Yes, that's what I mean.

[quote author="zhaopeng" date="1356080913"]Thanks a lot![/quote]

You're welcome ;)

[zhaopeng]

Sorry, I got another question. Can the sharing relationship be propagated and commutated? For example
@ QGLWidget * glWidget=new QGLWidget(QGLFormat::defaultFormat(),this);
QGLWidget * glWidget1=new QGLWidget(QGLFormat::defaultFormat(),this,glWidget);
QGLWidget * glWidget2=new QGLWidget(QGLFormat::defaultFormat(),this,glWidget1);@

glWidget is the share widget of glWidget1. According to the Qt doc glWidget1 will share its OpenGL resources with glWidget, which can be accessed in glWidget. How about glWidget's OpenGL resources? Can they be accessed in glWidget1?
Then glWidget1 is passed as share widget to glWidget2, so how about the relationship between glWidget and glWidget2.

Thanks!

[tilsitt]

When a gl widget has another one as sharing gl widget, both of them are pointing to a unique set of share-able resources (it's like sharing smart pointers): glWidget, glWidget1 and glWidget2 all work on a unique set of resources. So, yes glWidget can "access" glWidget1 and glWidget2, glWidget1 can "access" glWidget and glWidget2 and glWidget2 can "access" glWidget and glWidget1. For what I can say, there is no limitation in the number of gl widget sharing the same resources.

[zhaopeng]

[quote author="tilsitt" date="1356098680"]When a gl widget has another one as sharing gl widget, both of them are pointing to a unique set of share-able resources (it's like sharing smart pointers): glWidget, glWidget1 and glWidget2 all work on a unique set of resources. So, yes glWidget can "access" glWidget1 and glWidget2, glWidget1 can "access" glWidget and glWidget2 and glWidget2 can "access" glWidget and glWidget1. For what I can say, there is no limitation in the number of gl widget sharing the same resources.[/quote]

Great! Thank you for being such a big help! :)

[Kantharaj]

I have a problem in sharing a GLContext between two GLWidgets,
I have Dual monitor system which has got NVidia Graphics Card, Monitors are configured as Screen 0 & Screen 1 ( Separate X Screens). and i am trying to create one GLwidget on Screen 0 and the second GLWidget on Screen 1, if Both GLWidgets are at same screen i am able to share the context but if i create a second GLWidget on Screen 1 context is not sharing. Advance Thanks for any help.

[zhaopeng]

Are your two monitors connected to the same Nvidia card? I think the context can not be shared if each monitor has its own graphics card unless using SLI.

[Kantharaj]

Hi zhaopeng!
The two monitors are connected to same Nvidia Card and the both are configured as two screens.

[zhaopeng]

Hi,
It may be a big problem for me because I also have a plan to use dual monitor. I will give a try when another monitor is available and report the result.

[Kantharaj]

Thank you very much for your time!!

[Feiz]

@tilsitt you sure it can run right？