Hi Jesse,
I'm amazed that such a simple example is able to reveal a driver bug,
it really makes wonder how much testing the driver underwent before
being let out in the wild. Clearly Intel/Dell need to informed about
this problem, your example is simple enough that they should be able
to reproduce the problem easily themselves.
As for workarounds, you could try using osg::DrawElementsUShort rather
than a DrawArray primitive set, or merging the DrawArrays into a
single DrawArrays.
Robert.
On Tue, Nov 2, 2010 at 4:22 PM, Jesse Stimpson <jesse.stimp...@gmail.com> wrote:
> I'm doing some testing of osg 2.8.2 on a laptop with an integrated graphics
> chipset (Intel 4 Series Express) with the latest drivers from Dell.
> I'm finding that the hardware has trouble drawing line geometry when the
> lines are arranged in multiple PrimitiveSets underneath a single Geometry. I
> only see the line from the first PrimitiveSet drawn and the others are
> seemingly skipped. Disabling hardware acceleration fixes the problem; i.e.
> all lines are drawn.
> I've created a simple osg executable that reproduces the problem on my
> hardware. The code can be found below. Of course, both lines are drawn as
> expected on more capable hardware.
> Is there anything we can do in osg to fix or workaround this driver bug
> short of splitting up the lines into separate Geometrys rather than separate
> PrimitiveSets?
> Thank you,
> Jesse Stimpson
>
> Here is the sample code:
> #include <osgViewer/Viewer>
> #include <osg/Geode>
> #include <osg/Geometry>
> #include <osg/Array>
>
> int main(int argc, char* argv[])
> {
> osg::ArgumentParser arguments(&argc,argv);
> osgViewer::Viewer viewer(arguments);
> osg::Geode* geode = new osg::Geode;
> osg::Geometry* geom = new osg::Geometry;
> osg::Vec3Array* verts = new osg::Vec3Array;
> osg::Vec4Array* color = new osg::Vec4Array;
> verts->push_back(osg::Vec3(0,0,0));
> verts->push_back(osg::Vec3(0,0,1));
> verts->push_back(osg::Vec3(1,0,0));
> verts->push_back(osg::Vec3(1,0,1));
> color->push_back(osg::Vec4(1,0,0,1));
> geom->setVertexArray(verts);
> geom->setColorArray(color);
> geom->setColorBinding(osg::Geometry::BIND_OVERALL);
> geom->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);
> geom->addPrimitiveSet(new osg::DrawArrays(GL_LINES, 0, 2));
> geom->addPrimitiveSet(new osg::DrawArrays(GL_LINES, 2, 2));
> geode->addDrawable(geom);
> viewer.setSceneData( geode );
> viewer.realize();
> return viewer.run();
> }
>
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>
>
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