[SDL] glSDL and OpenGL at the same time

[Olivier Delannoy]

On 8/26/05, David Olofson <david at olofson.net> wrote:
> On Friday 26 August 2005 13.30, Olivier Delannoy wrote:
> > I am interesting in using CEGUI as a gui toolkit for all of my
> > application. This library relies on OpenGL. I would like to know if
> > it is possible to use an OpenGL programming at the same time as
> > glSDL. glSDL relies on OpenGL, CEGUI too and so it should be
> > possible to make them work at the same time. In a more generic
> > context might it be possible to use glSDL and OpenGL at the same
> > time in an application.
> 
> It's possible, but not officially supported, mainly for two reasons,
> the second one being the more important one:
> 
>         1. Adding the requirement of nice cooperation with other
>            OpenGL code impacts the optimization possibilities of
>            the glSDL backend, and may require SDL API extensions.
>            Whatever glSDL does, it would have to consider the side
>            effects on any other, unknown code, that shares the
>            OpenGL context.
> 
>         2. glSDL is an SDL backend that brings hardware acceleration
>            to the SDL *2D* API on a wide range of platforms. It is
>            not intended to be used by applications that will not
>            run at all without OpenGL, as these are better off using
>            OpenGL directly anyway.
> 
> 
> That is, if you want to use CEGUI, you'll need OpenGL anyway. So, why
> not just use OpenGL directly for your own rendering as well? It's a
> more powerful API, and you could probably gain some performance over
> glSDL.
> 
The aim is to use only one Gui toolkit for both 2d and 3d application. 

> //David Olofson - Programmer, Composer, Open Source Advocate
> 
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