Re: [UFO-devel] Bug#385945: boson: crashes on singleplayer game start

[Andreas B. <b_...@gm...>]

On Friday 15 September 2006 21:38, Eddy Petri=C5=9For wrote:
[...]
> boson: ERROR: [void BosonCanvasRenderer::initGL()] boson requires
> GL_EXT_framebuffer_object

This is NOT the problem, btw. This error merely exists because this extensi=
on=20
might be used by boson without checking whether it actually is available.
This may or may not lead to a crash - but in this particular case it is=20
actually harmless.

CC'ing boson-devel anyway, cause I think it should be fixed, as apparently =
not=20
all drivers implement this extension.

> boson: indirect_vertex_array.c:1359: __indirect_glTexCoordPointer:
> Assertion `a !=3D ((void *)0)' failed.
[...]

This is the actual source of the problem.
I have done some additional research and have been able to reproduce the bu=
g=20
on one of my own machines. It happens with mesa based drivers only.
It appears to me that this is a bug in mesa, in particular I believe it is
http://www.mail-archive.com/mesa3d-dev%40lists.sourceforge.net/msg00772.html
The fact that this problem goes away with libgl1-mesa-dri 6.5.0.cvs.2006052=
4-1=20
seems to confirm that, as current mesa versions don't include the fix yet,=
=20
cvs does.
However I have no idea how to write around this problem so that it works fo=
r=20
broken mesa versions, too. The only way I can see atm is not to use vertex=
=20
arrays, but this solution _really_ sucks and would require quite some chang=
es=20
to libufo.

CC'ing libufo-devel for this problem, maybe some good idea comes up.=20
Additional information for libufo developers:
It stems from usage of vertex arrays in libufo, however I have not yet mana=
ged=20
to narrow it down to the exact combination of circumstances (meaning I=20
haven't had time to write a few test cases yet).
=46rom what I have found by now, I think it happens only when using=20
ufo::UVertexArray with triangles (i.e. not with lines). IIRC it was=20
PE_IndicatorRadioButton in UBasicStyle::paintPrimitive() that triggered the=
=20
bug for me.=20

CU
Andi