Re: Questions about "configure" and "native graphics"

[Julien Bect]

Le 21/04/2015 15:04, Mike Miller a écrit :
> On Tue, Apr 21, 2015 at 08:47:21 +0200, Julien Bect wrote:
> > What does "native graphics" mean ?
> The way I understand it is a blanket term to describe both the FLTK
> and Qt plotting toolkits and the support libraries needed to make
> those work.

Ok... So, if "native graphics" covers both FLTK and Qt, considering the 
warnings :

configure: WARNING: --without-fltk specified.  Native graphics will be 
disabled.

configure: WARNING: I didn't find the necessary libraries to compile native
configure: WARNING: graphics.  It isn't necessary to have native graphics,
configure: WARNING: but you will need to have gnuplot installed or you 
won't
configure: WARNING: be able to use any of Octave's plotting commands

shouldn't I get gnuplot only ?


Let me try to explain (but please remember that I really don't 
understand much about this OpenGL / GLX / FTLK / Qt stuff...).

I am building on a Debian Wheezzy system without direct rendering 
capabilities (no graphics card).

I have, among other things, libgl1-mesa-glx, libgl1-mesa-dev and 
libqt4-opengl installed.

When I configure with "--without-fltk", I still end up with both "qt" 
and "gnuplot" available as graphics toolkits.

"qt" is selected as the default toolkit but I can't plot anything 
(figure successfully creates a frame, with various buttons and menus, 
but everything seems frozen and I can't plot).


Does "native graphics" means the same as "direct rendering" ?

Can I expect the Qt toolkit to work on a system without graphics card, 
using GLX ?


> > And why do I get a warning about not finding libraries for "native
> > graphics", since "native graphics" have been disabled because of
> > --without-fltk ?
> Is your question why is the warning phrased the way it is, or why do
> you get a warning at all since you intentionally disabled something?
>
> If the latter, that's simply the approach taken for all optional
> libraries with Octave, to warn you about what features you might be
> missing because of your choices.

Yes, it was the latter. Thanks.