[Qt-interest] QGLWidget Vs "-graphicssystem opengl"

[Nathan Carter]

Amit,

It depends on what you want to show in your application.

If you want to show widgets, the stuff that Qt is built to draw for  
you, then you just build a UI using the usual Qt tools and you may  
choose to render it with -graphicssystem opengl or not.  But what gets  
shown are Qt widgets.

If you want to show a 3D architectural model, or a 2D side-scroller  
video game, or any of a host of other virtual worlds that you want to  
write the OpenGL code to render, then you'll need an OpenGL context  
and a place to put your initialization and rendering code; QGLWidget  
provides you with those things.

Summary:
	For standard UI widgets, use Qt with or without -graphicssystem opengl.
	For standard OpenGL use cases (games, 3D models, etc.) use QGLWidget.

Nathan


On Jul 15, 2009, at 7:45 AM, Amit Pundir wrote:

> Hi,
>
> Please help me in understanding the difference between QGLWidget and
> "-graphicssystem opengl" switch.
>
> What will be the difference if I use QGLWidget for rendering OpenGL
> graphics, and 2nd case, if I render normal widgets with opengl backend
> using "-graphicssystem opengl" switch?
>
> What is a typical usage scenario for both the cases?
>
> I'm not a graphics expert so there are chances that this question may
> sound stupid :)
>
> Thanks for your concern.
> Regards
> Amit Pundir
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