Hi Manu,
In recent VPB work I have actually experimented with this approach,
its not full blown like in boost codes, but it's a step along the way,
and certainly much cleaner than the existing .osg and .ive codes.
BTW, have you considered automatically generating the .cpp file using
osgIntrospection?
W.r.t boost I'm not keen to introduce this as a dependency into the
core OSG, but I'm certainly not shy of learning a few tips and tricks
from it so am very interested to see how you get on.
Robert.
On Jan 10, 2008 3:27 PM, Emmanuel Roche <[EMAIL PROTECTED]> wrote:
> Hi every one,
>
> I'm just wondering if any one as never think about using Boost serialization
> framework to write/read OSG files ?
>
> I'm working on this question, and until now I'm rather amazed:
>
> - Sure, on one side you need to have a Boost dependency somewhere,
> - And I haven't done any performance test yet but I'm pretty sure the io
> operations will be slower than forIVE files.
>
> But if read/write speed is not that critical to you this kind of framework
> has very interesting feature:
>
> 1) You can use a single function to handle read and write process per class
> 2) This single function is used to write Text, Binary or even XML files (so
> no duplication of code like for .osg vs .ive)
> 3) The code to do this become so simple it's almost frightening (cf example)
> (in fact it hides all the reading/writing details...)
> 4) You can extend OSG with your own classes even more easily.
>
> If someone already worked on this subject, did you end up with an unsolvable
> problem ?
>
>
> Here is an example of the code I use to serialize osg::Geometry:
>
> #include <osg/Geometry>
>
> #define TARGET osg::Geometry
>
> BOOST_CLASS_EXPORT(TARGET)
>
> namespace boost {
> namespace serialization {
>
> OSG_REF_TEMPLATE(TARGET);
>
> template <>
> void access::destroy(const TARGET* t)
> {
> // Do nothing: protected destructor;
> }
>
> template<class Archive>
> void serialize(Archive & ar, TARGET::ArrayData& obj, const unsigned int
> version)
> {
> NVP("Array",obj.array);
> NVP("Indices", obj.indices);
> NVP("Binding",obj.binding);
> NVP("Normalize", obj.normalize);
> };
>
> template<class Archive>
> void serialize(Archive & ar, TARGET& obj, const unsigned int version)
> {
> SERIALIZE_BASE(osg::Drawable);
>
> NVP("PrimitiveSetList",obj.getPrimitiveSetList());
> NVP("VertexData",obj.getVertexData());
> NVP("NormalData",obj.getNormalData());
> NVP("ColorData",obj.getColorData());
> NVP("SecondaryColorData",obj.getSecondaryColorData());
> NVP("FogCoordData", obj.getFogCoordData());
> NVP("TexCoordArrayList",obj.getTexCoordArrayList());
> NVP("VertexAttribArrayList",obj.getVertexAttribArrayList());
>
> SERIALIZE_MEMBER(bool,FastPathHint);
> }
>
> } // namespace serialization
> } // namespace boost
>
> #undef TARGET
>
> With the following macros:
>
> #define OSG_REF_TEMPLATE(name) template<class Archive> \
> void serialize(Archive & ar, osg::ref_ptr<name>& ref, const unsigned int
> version) \
> { \
> name* obj = ref.get(); \
> ar & obj; \
> ref = obj; \
> }
>
> #define SERIALIZE_MEMBER(type,name) { \
> type member = obj.get ## name(); \
> ar & boost::serialization::make_nvp( # name, member); \
> if(Archive::is_loading()) \
> obj.set ## name(member); \
> }
>
> #define NVP(t,o) ar & boost::serialization::make_nvp(t,o)
>
> #define SERIALIZE_BASE(name) ar & boost::serialization::base_object<
> name >(obj)
>
>
> ... Compare this with the content of Geometry.cpp in the osg or ive plugin
> and you will probably be surprised... : the Boost serialization framework
> handle automatically STL containers, derived classes, pointer references
> etc...
>
> Any way, I keep working on this project until I have a full
> "ReaderWriter"... I'll tell you later if it's a so interesting feature or
> not :-).
>
> Manu.
>
>
> _______________________________________________
> osg-users mailing list
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> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
>
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