Re: [Freeglut-developer] fbconfig error

[Eero P. <epa...@gm...>]

On Fri, Aug 10, 2012 at 3:36 PM, John Tsiombikas <nu...@me...> wrote:

> There are two issues here.
>
>> freeglut (pymol): ERROR: Internal error <FBConfig with necessary
>> capabilities not found> in function fgOpenWindow
>
> Pymol made freeglut ask for a GLX visual that wasn't possible. This
> happens for instance if you ask for stereoscopic visuals on machines
> without stereo support. Knowing that pymol does indeed use stereo OpenGL
> (optionally I believe), this is probably the cause in this case, and no
> fault of freeglut.
>

The situation might be more complicated, when using the NX remote desktop
I am able to run things like glxgears (although "slowly") and glxinfo
returns four
reasonable looking visuals.

4 GLXFBConfigs:
    visual  x   bf lv rg d st  colorbuffer  sr ax dp st accumbuffer  ms  cav
  id dep cl sp  sz l  ci b ro  r  g  b  a F gb bf th cl  r  g  b  a ns b eat
----------------------------------------------------------------------------
0x039 24 tc  0  24  0    y .   8  8  8  0 .  .  0 16  0  0  0  0  0  0 0 None
0x03a 24 tc  0  24  0    y .   8  8  8  0 .  .  0 16  8 16 16 16  0  0 0 None
0x03b 24 tc  0  32  0    y .   8  8  8  8 .  .  0 16  8 16 16 16 16  0 0 None
0x03c 24 tc  0  32  0    . .   8  8  8  8 .  .  0 16  8 16 16 16 16  0 0 None


But my freeglut program gets nothing from glXChooseFBConfig
I just ran the program under debugger and I at least tried to
set 0 as  the first attribute (I hope that means None) and thus
remove all the attributes, I still get no configs back.

I will try this again later.

I do agree that this does not mean that there is anything wrong with
freeglut,  I think it is more likely that the OpenGL implementation is
somehow broken regarding this issue.

     Eero