Delivered-To: garrigue at math.nagoya-u.ac.jp
Delivered-To: lablgtk at yquem.inria.fr
Date: Wed, 7 Jan 2009 22:18:31 +1100
From: Erik de Castro Lopo <mle+ocaml at mega-nerd.com>
To: lablgtk at yquem.inria.fr
Subject: Re: [Lablgtk] lablGL and GLX extentions?
Message-Id: <20090107221831.df57cb6e.mle+ocaml at mega-nerd.com>
In-Reply-To: <200901070925.38869.fmonnier at linux-nantes.fr.eu.org>
References: <20090107103951.bd36a6ba.mle+ocaml at mega-nerd.com>
	<200901070925.38869.fmonnier@linux-nantes.fr.eu.org>
Organization: Erik Conspiracy Secret Labs
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Reply-To: lablgtk at yquem.inria.fr

Florent Monnier wrote:

> On which points? could you develop?

Coding OpenGL in C is simply too much of a PITA, with  all the memory
management issues etc. Python is too much of a pain because of run
time errors that that compiler should have found.

> Also I have made an attempt to make a simili-functional opengl interface:
> http://www.linux-nantes.org/~fmonnier/OCaml/GL/doc/FunGL.html

Ow, the colours on that page make it a little hard to read.

Is this an alternative to lablGL?

> It is possible to compose a pixmap into an OpenGL texture,

Yep, I knew how to do that, but ...

> and you can get a pixmap from a window.

I was a bit stuck on  how to do the second part.

What I'm basically try to do is place 2D application windows in a 3D
space, much like SUN's Project Looking Glass:

    http://www.sun.com/images/k3/k3_lglass_gallery3.gif

and then handle mouse and keyboard events and pass them on down to
the 2D windows as required.

> This technique is explained here (for C):
> http://www.opengl.org/wiki/index.php/Programming_OpenGL_in_Linux:_Creating_a_texture_from_a_Pixmap
> 
> It can be achieved from OCaml in exactly the same way.
> I have made an ocaml version of this demo program.
> This script is called "pixmap_to_gl.ml" in the Xlib-OCaml bindings here:
> http://www.linux-nantes.org/~fmonnier/OCaml/Xlib/

I  tried to compile that with  the  shell script provied  but got:

    Cannot find file GL.cma.

> So to answer to your question, yes you can use LablGL with GLX:
> http://www.linux-nantes.org/~fmonnier/OCaml/Xlib/doc/GLX.html
> 
> (there are still a couple of functions from the GLX api that are not wrapped 
> yet, if you need those just ask)

I am under the impression that I need glXBindTexImageEXT, glXReleaseTexImageEXT
and maybe some others.

> PS: you are not on the LablGL mailing list but on the LablGTK one!

I  goggled for "lablGL mailing list" but didn't find one and there was
recently an  announcement on this list of a new  version of lablGL.

Erik
-- 
-----------------------------------------------------------------
Erik de Castro Lopo
-----------------------------------------------------------------
"Every time microshaft's stock price drops again, I rejoice. I
want to see that bunch of criminals brought to their knees.
Preferably at the chopping block."
-- rixt in http://linuxtoday.com/stories/20659_flat.html

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