Re: [gl4java-usergroup] Activating and freeing GL context

[Jean-Yves B. <jea...@wa...>]

Hello Max.

1.
==
I tried to call several times gljmakeCurrent(true)
in the display method and I didn't get any crash
on Windows.

I use sun jvm from jdk 1.2.2.

2.
==
When I need to make gl call outside of display() method,
I use the following piece of code:

/////
synchronized(MyConstants.synchronizator)
// MyConstants.synchonizator is a static String used to
// synchronize all gl call.
{
   if (canvas.gljmakeCurrent(true))
    {
        GLFunc gl = canvas.getGl();
        GLUFunc glu = canvas.getGlu();

        // Here all my gl calls...
        // ....


       canvas.glFree();
}
///////

Maybe it is too heavy code. I don't know if
gljmakeCurrent() and glFree() takes lot of time or not to execute.

3.
==
Anyway, I agree with you:
Checking if a GL context is made already current
would be nice.

Jean-Yves


Max Gilead a *crit :

> Hello!
>
> It seems like this message slipped by unnoticed. Since it is important
> issue I'm sending it again.
>
> -------- Original Message --------
> From: Max Gilead <gi...@li...>
> Subject: Activating and freeing GL context
> To: GL4Java mailing list <gl4...@li...>
>
> Hello!
>
> Is there any way of checking if a GL context is made already current
> (gljMakeCurrent())? Calling gljMakeCurrent() twice crashes JVM, haven't
> checkeg gljFree() twice... but is there some clean way of checking it?
>
> BTW, is it possible to change GL4Java's behavior from crashing JVM to
> just throwing an exception in case of duplicate context activation? This
> is true for GL4J 2.4.0.0 and Sun's JVMs 1.2.2 and 1.3rc1 and IBM's 1.3 /
> Linux.
>
> Max
>
> --
> Max Gilead (gi...@li...)
> http://3d.linart.krakow.pl/OfficinaArtificialis
> ---
> -- XMage: Image / 3D / OpenGL Java library -
> http://xmage.sourceforge.net
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--
--------------------------------------
Jean-Yves BRUD
POLYQUARK - Ingenierie & Creation 3D
Palahou - 31330 LARRA    France
Tel: 05.62.79.03.33  Fax: 05.62.79.03.38
Mail: jea...@wa...
--------------------------------------