Hi Leif, Thanks for the pointers, when I get a chance I'll boot up the Intel box and have a bash.
Robert. On Fri, Apr 10, 2009 at 8:51 PM, Leif Delgass <[email protected]> wrote: > On Thu, Apr 9, 2009 at 5:01 AM, Robert Osfield <[email protected]> > wrote: > > Things aren't prefect though. No Texture3D support, so volume rendering > > support fails. There is also no PBuffer support. No texture compression > > support either so standard VPB generated models just result in white > > models. The vertex throughput is also very poor, even small models like > > cow.osg just return max frame rates of 200fps while I normally get many > > thousand of fps on ATI and NVidia. Big town models also really slow when > > lots of objects/geometry are in the scene. I kinda suspect that the > drivers > > aren't well optimized for the vertex load. > > Robert, > > Regarding texture compression: by default Mesa DRI drivers don't > enable texture compression due to patent and conformance issues. > There is no software compression/decompression in the Mesa > distribution because of patents, but it has hooks for a software > implementation in a shared library. If the hardware (and driver) > supports decompression, you can force the s3tc extensions on using > driconf (there is a force_s3tc_enable option that it can write to an > XML config in ~/.drirc). Without the libtxc_dxtn library, using the > GL extension for compressing textures or reading back compressed > textures won't work, but texturing from pre-compressed textures should > work. Because conformance to the extension spec. requires those > features, this option is off by default. The legality of using the > external library depends on patent laws in your area, but there is a > source distribution and more info. available here: > > http://homepage.hispeed.ch/rscheidegger/dri_experimental/s3tc_index.html > > I don't have much experience with the intel DRI drivers, but I'd be > surprised if they didn't have support for decompression where the > hardware can do it, since it is fairly simple to implement in a Mesa > driver if you have the hardware documentation. > > Leif Delgass > _______________________________________________ > osg-users mailing list > [email protected] > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >
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