Hello Johannes,
On 02/28/2012 03:14 AM, Johannes Brunen wrote:
> I did run into an infinite loop in ShaderCacheTreeV3::sub method. I have
> no clue what is actually happening, therefore I will just outline my
> setup. I have build a scene graph with some of the geometry cores shared
> by different material branches. The materials I use fall into two
> groups. The first one is just a classical OpenGL material, nothing fancy
> there. The second one is a ShaderProgram material with a vertex,
> geometry and fragment shader responsible for rendering the silhouettes
> of the geometry. The ShaderProgram chunks are shared among all of the
> materials in the second group.
FWIW that sounds reasonable to me.
> Overall this setup works quite well, but
> sometimes my application freezes. As it turned out it is hanging in the
> following snipped of OpenSG code:
>
> OSGShaderCacheTree.inl : 3255
To be honest, I'm still hoping Gerrit will chime in on this since he is
the only one who knows how the ShaderCaches work :(
Since you've found that it runs into an infinite loop, somehow
pCurrNode->_pNext must end up pointing to itself (or possibly another
predecessor). I can see at least one theoretical code path through
ShaderCacheTreeV3<>::add() where _pPrev,_pNext are not initialized, but
then I'd expect a crash from a NULL deref not an infinite loop.
>> From the application prespective, I did delete one of my solid bodies,
> i.e. destroyed the associated scene graph parent node with the two
> branches responsible for rendering the opaque faces and the silhouettes.
> However, not every deletion operation leads to the hanging.
>
> Any idea how I can track this problem?
One thing that may help is if you could produce dumps of the ShaderCache
right removing an object from your scene - using
Window::getShaderCache()->dump().
If you are on Windows you may want to patch OSGShaderCache.cpp:371 to
dump to a path different from "/tmp/exetree.dot" though ;)
If you could post the generated .dot file, hopefully I can find out how
the data structure is broken and track the place where it happens from
there.
Cheers,
Carsten
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