Hi Paul and Lionel, In the implementation that I went for in osg::State for the required calls glDraw*Instanced*() calls I used a query for glDraw*Instanced and glDraw*InstancedEXT. glDraw*Instanced doesn't exist yet but the code will pick up on it when it comes along. We could add a check for glDraw*InstancedARB into the mix as well.
There isn't presently any extension checking beyond the query for the function pointers. Robert. On Wed, Jan 7, 2009 at 4:24 PM, Paul Martz <[email protected]> wrote: > Draw_instanced was promoted to an ARB extension in the OpenGL 3.0 timeframe > (last August), and I found it was only available as ARB in NVIDIA's beta > OpenGL 3.0 drivers. Rather than require OSG users to upgrade to beta drivers > to access this functionality, I opted to use the EXT version. > > Using EXT also simplifies the vertex shader. To use the ARB extension, I > would've been forced to use GLSL 1.3, which removes all the predefined > uniforms. It's a whole new world of shader development, and one I wasn't > quite ready to dive into given the non-existent funding for this feature. > > Paul Martz > Skew Matrix Software LLC > http://www.skew-matrix.com > +1 303 859 9466 > > ________________________________ > From: [email protected] > [mailto:[email protected]] On Behalf Of > Lionel Lagarde > Sent: Wednesday, January 07, 2009 1:52 AM > To: OpenSceneGraph Submissions > Subject: Re: [osg-submissions] Support for draw_instanced > > Hi, > > Why you use the EXT version of draw_instanced. This extension has an ARB > version. > > Paul Martz wrote: > > Hi Robert -- My update and build of OSG went fine, and my draw instanced > test programs ported to your implementation smoothly. Thanks again for your > help on this great new feature of OSG. > > Hi to all -- Current svn head of OSG now supports EXT_draw_instanced. Check > out the osgdrawinstanced example, which creates a scene graph consisting of > a single Geode with a single Geometry with four vertices, but draws several > hundred quads at different orientations, positions, and colors. > > Paul Martz > Skew Matrix Software LLC > http://www.skew-matrix.com > +1 303 859 9466 > > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of > Robert Osfield > Sent: Tuesday, January 06, 2009 9:14 AM > To: OpenSceneGraph Submissions > Subject: Re: [osg-submissions] Support for draw_instanced > > Hi Paul, > > On Tue, Jan 6, 2009 at 4:06 PM, Paul Martz <[email protected]> wrote: > > > Especially thanks for placing the extension support check in State. I > disliked having it in the draw() method, but wasn't sure where it should > > > go. > > Extension checking/function call set up is both a strong and a weak point in > the OSG, there are motivations for centralising extension setup and > motivations for keeping them local to classes - so the OSG has ended up > doing both in different places, sometimes for good reasons, sometime for the > wrong reasons... It'd be nice to have a simpler and more manageable scheme > that avoids the issues of being pulled in different directions. OpenGL ES > and OpenGL 3.x into the mix will further complicate things unless we do come > up with a new scheme... > > > > I'm updating and building now. I'll let you know if I find any issues. > > > Thanks, > Robert. > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph. > org > > _______________________________________________ > osg-submissions mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-submissions-openscenegraph.org > > __________ Information provenant d'ESET NOD32 Antivirus, version de la base > des signatures de virus 3745 (20090107) __________ > > Le message a été vérifié par ESET NOD32 Antivirus. > > http://www.eset.com > > > > > > > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > > _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
