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Use DEEP_COPY_PRIMITIVES to work around problem in osg::Geometry copy constructor (Bug #2754)

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scrawl 2015-08-30 20:00:37 +02:00
parent 8aaba0af6f
commit cda8a88f0d
1 changed files with 26 additions and 0 deletions
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26
components/sceneutil/clone.cpp
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@ -52,6 +52,32 @@ namespace SceneUtil
{
osg::CopyOp copyop = *this;
copyop.setCopyFlags(copyop.getCopyFlags()|osg::CopyOp::DEEP_COPY_ARRAYS);
/*
Deep copy of primitives required to work around the following (bad?) code in osg::Geometry copy constructor:
if ((copyop.getCopyFlags() & osg::CopyOp::DEEP_COPY_ARRAYS))
{
if (_useVertexBufferObjects)
{
// copying of arrays doesn't set up buffer objects so we'll need to force
// Geometry to assign these, we'll do this by switching off VBO's then renabling them.
setUseVertexBufferObjects(false);
setUseVertexBufferObjects(true);
}
}
In case of DEEP_COPY_PRIMITIVES=Off, DEEP_COPY_ARRAYS=On, the above code makes a modification to the original const Geometry& we copied from,
causing problems if we relied on the original Geometry to remain static such as when it was added to an osgUtil::IncrementalCompileOperation.
TODO: report/fix in upstream OSG
*/
copyop.setCopyFlags(copyop.getCopyFlags()|osg::CopyOp::DEEP_COPY_PRIMITIVES);
osg::Drawable* cloned = osg::clone(drawable, copyop);
if (cloned->getUpdateCallback())
cloned->setUpdateCallback(osg::clone(cloned->getUpdateCallback(), *this));