Hi
From my own experience, display lists runs with good speed when:
1) vertex number is at most like 100k, with huge vertices count per drawable
vbos tends to be faster
2) display lists works best with triangle strips \ indexed list
both display lists and vbos performance can greatly vary with different data
types in vertex attributes (f.e. ushort indices is generally faster then ubyte
and uint, texcoords\ vertex colors works best with float or ushort etc) and
vertex attributes count, in some combinations vbos faster, in others dls.
As a side note, you'd better use triangles instead of quads, as they can work
quite a bit slower than triangles
Cheers.
28.02.2012, 14:20, "Martin Groer" <grosser.mar...@gmx.de>:
> Hello,
>
> I am surprised about my little test program. I would like compare
> displaylists with frame buffer objects. Because, I suppose that the
> displaylists have to be faster than the vbo, because the displaylists are
> precompiled. But in my example I get another result:
>
> VBO: 225 FPS
> DL: 88 FPS
>
> Is that possible?
>
> Following a part of my code:
> --------------------------------
>
> // Geometry (Grid-Plane)
> ::osg::Geometry* geom = new osg::Geometry;
>
> // Vertex Array (Grid with 1000 x 1000 quads)
> ::osg::ref_ptr< ::osg::Vec3Array > v = new ::osg::Vec3Array();
> for(unsigned int x=0; x < 1000; x++)
> {
> for(unsigned int y=0; y < 1000; y++)
> {
> // create points
> }
> }
> geom->setVertexArray(v);
>
> #ifdef ENABLE_VBO
> // Vertex Buffer Object
> osg::VertexBufferObject* vbo = geom->getOrCreateVertexBufferObject();
> vbo->setArray(0,v);
> vbo->setUsage(GL_STATIC_DRAW);
> geom->setUseVertexBufferObjects(true);
> geom->setSupportsDisplayList(false);
> geom->setUseDisplayList(false);
> #else
> geom->setSupportsDisplayList(true);
> geom->setUseDisplayList(true);
> #endif
>
> // Primitive
> ::osg::DrawArrays* da = new
> ::osg::DrawArrays(::osg::PrimitiveSet::QUADS,0,v->size());
> geom->addPrimitiveSet(da);
>
> // Geometry Node
> ::osg::Geode* geode = new osg::Geode;
> geode->addDrawable(geom);
>
> ----------------------------------------
>
> Thanks
>
> Martin
>
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