So you are executing an update callback from a cull callback? Assuming
your update callback actually modifies the uniform, this is not
thread-safe and will likely crash if there are multiple concurrent cull
traversals.
I got around this by keeping a StateSet (and Uniform) per CullVisitor. I
used the CullVisitor address to look up the StateSet from a std::map.
Then I could safely set the Uniform value.
Paul Martz
Skew Matrix Software LLC
_http://www.skew-matrix.com_ <http://www.skew-matrix.com/>
+1 303 859 9466
Emmanuel Roche wrote:
Hi Paul,
On my side I finally ended with the initial design I had in mind:
I use a specific nodecallback on the node where the stateset containing
my uniforms is. This callbacks, used as a CullCallback give me the
opportunity to call the uniform update callbacks with a cullvisitor
during the cull phase.
It's not the cleanest option (I'd really wish there were cull callbacks
for uniforms directly!) but it works very well for me:
void UniformCullCallbackBridge::operator()(osg::Node * node,
osg::NodeVisitor * nv) {
// Bouml preserved body begin 00035E8A
// retrieve the stateset on the node:
osg::StateSet* ss = node->getStateSet();
if(ss) {
osg::StateSet::UniformList& uniforms = ss->getUniformList();
for(osg::StateSet::UniformList::iterator uitr = uniforms.begin();
uitr != uniforms.end();
++uitr)
{
osg::Uniform::Callback* callback =
uitr->second.first->getUpdateCallback();
if (callback) (*callback)(uitr->second.first.get(),nv);
}
}
return traverse(node,nv);
// Bouml preserved body end 00035E8A
}
Thanks to everyone for your help/explanations on this.
Manu.
2010/1/30 Paul Martz <[email protected]
<mailto:[email protected]>>
Emmanuel Roche wrote:
Those questions were indeed closely related. Yet since I'm not
planing to use slave cameras for the moment I guess I'm better
of with my "node cullcallback to update uniforms", at least I
will try that.
The subject was poorly chosen. The thread was more related to how to
set a different uniform per cull/draw pair - per display or per
window. Setting the uniforms in the slave camera StateSet is one
solution, and Robert's recent code change is designed to support
that usage.
I wanted my solution to work whether the application used slave
cameras or not, so, like you, I needed this to work without slave
cameras. The solution I choose was to push a StateSet containing a
uniform onto the CullVisitor's state stack.
Hope that helps.
-Paul
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