Hi Robert, I have been trying to unsubscribe from your site for weeks, can't do
it, I have no idea what you guys are talking about and my inbox and spam are
always full.
Please help,
Andree
--- On Sat, 11/4/09, Robert Osfield <[email protected]> wrote:
From: Robert Osfield <[email protected]>
Subject: Re: [osg-users] Red, Green and Blue, now I've tried two!
To: "OpenSceneGraph Users" <[email protected]>
Received: Saturday, 11 April, 2009, 6:41 AM
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
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