Another idea would be a subclass of Uniform (MultiplexingUniform?) that you can program per context.
Or, a variation on Aurelien's approach would be to use: osg::buffered_object<osg::ref_ptr<Uniform>> multiUniform; And then index that by the GC ID if it's available through the cv->getCurrentCamera(). This would be nice in that it doesn't require a mutex. Note: I've not tried this nor verified that it's possible :) Glenn Waldron / @glennwaldron On Thu, Oct 24, 2013 at 4:26 AM, Aurelien Albert < [email protected]> wrote: > Hi, > > At cull traversal, I do the following (this is pseudo-code!) : > > > Code: > cullTraversal(pCullVisitor) > { > // Get per-view-data > perViewData = getOrCreatePerViewData(pCullVisitor); > > // Compute "dynamic" uniforms > perViewData.pDynamicUniform_1->set(value); > perViewData.pDynamicUniform_2->set(value); > perViewData.pDynamicUniform_3->set(value); > > // Push per-view data > pCullVisitor->pushStateSet(perViewData.pStateSet); > > // Traverse node > traverse(....) > > // Pop per-view data > pCullVisitor->popStateSet(); > } > > > > The "getOrCreatePerViewData" method returns a "PerViewData" struct : > > > Code: > > struct PerViewData > { > osg::ref_ptr<osg::StateSet> pStateSet; > osg::ref_ptr<osg::Uniform> pDynamicUniform_1; > osg::ref_ptr<osg::Uniform> pDynamicUniform_2; > osg::ref_ptr<osg::Uniform> pDynamicUniform_3; > > PerViewData() > { > pStateSet = new osg::StateSet(); > > pDynamicUniform_1 = osg::Uniform(); > pDynamicUniform_2 = osg::Uniform(); > pDynamicUniform_3 = osg::Uniform(); > > pStateSet->addUniform(pDynamicUniform_1); > pStateSet->addUniform(pDynamicUniform_2); > pStateSet->addUniform(pDynamicUniform_3); > } > } > > PerViewData getOrCreatePerViewData(pCullVisitor) > { > return m_perViewDataMap[pCullVisitor]; > } > > > > > Just be carrefull to : > > - remove "PerViewData" instance from the "m_perViewDataMap" when the > corresponding "pCullVisitor" instance is destroyed. (use an osg::Observer > here) > - add any necessary mutex in multithreading mode > > > > Cheers, > Aurelien > > ------------------ > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=56957#56957 > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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