[osg-users] About Interleaved Array Support

[Robert Osfield]

Hi Julien,

I considered interleaved support in the past and decided against it as
the value it provided isn't that great and it limits how many classes
can process the geometry as it's an non standard form.

Modern graphics card cope just fine with non interleaved data so what
is your motivation?

Cheers,
Robert.
On Wed, 10 Oct 2018 at 10:50, Julien Valentin
<julienvalentin51 at gmail.com> wrote:
>
> Hi,
> I have an implementation of InterleavedGeometry : public Drawable
> I think it's really something missing for a long time in osg
> Would it worse a pr...?
>
> here's a sample usage  to review chosen api
>
> Code:
>
>     ///test interleavedGeometry
>     InterleavedGeometry * igeom=new InterleavedGeometry();
>     igeom->setUseDisplayList(false);
>     igeom->setUseVertexBufferObjects(true);
>     igeom->setUseVertexArrayObject(true);
>
>     struct example{
>         float pos[3],norm[3],texcoor[3],padding[3];//add 3 float padding for mem alignement
>     };
>     unsigned int stride=sizeof(struct example);
>     osg::ref_ptr<osg::BufferTemplate< std::vector<example>  > >  hostarray=new osg::BufferTemplate< std::vector<example>  >;
>     hostarray->resize(4);
>     hostarray->setBinding(osg::Array::BIND_PER_VERTEX);
>     hostarray->setBufferObject(new osg::VertexBufferObject);
>   InterleavedGeometry::RangedBufferData *rbd=new InterleavedGeometry::RangedBufferData;
>   InterleavedGeometry::RangeDesc interleaveddesc;
>   interleaveddesc.push_back(InterleavedGeometry::SubDataDesc(GL_FLOAT,3,0));
>   interleaveddesc.push_back(InterleavedGeometry::SubDataDesc(GL_FLOAT,3,3*sizeof(GLfloat)));
>   interleaveddesc.push_back(InterleavedGeometry::SubDataDesc(GL_FLOAT,3,6*sizeof(GLfloat)));
>   igeom->addRangedBufferData(0,2,hostarray,interleaveddesc,stride );
>
>     for(int j=0;j<2;j++){
>         for(int i=0;i<2;i++){
>             for(int k=0;k<3;k++){
>         float * fdata=igeom->getRangedBufferData(0)->data<float>(i*2+j,k);
>        *fdata++=float(i)*1.0f;
>        *fdata++=float(j)*1.0f;
>        *fdata++=0;
>        }
>     }
>     }
>
>
>
> Julien[/code]
>
> ------------------------
> Twirling twirling twirling toward freedom
>
> ------------------
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=75058#75058
>
>
>
>
>
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