[visionegg] Re: visionegg Digest V3 #44

Dear Chris,

Thanks, but WRT to the Radeon 9000 card, I think you may be confusing a 10-bit CLUT (color lookup table, aka gamma table), which, with an 8-bit framebuffer, would let one specify 256 values per color distributed throughout a space of 1024 total values. However, a 10-bit framebuffer would let one simultaneously display 1024 values (and it would then seem one would want a higher-bit depth CLUT).

Please correct me if I'm wrong.

The Vision Egg does also support 10-bit CLUTs. (In fact the values are specified as 16 bit numbers.)

Cheers!
Andrew

Christopher Taylor wrote:

Hi All,

I just noticed this message and I can comment on the use of 10-bit ATI Radeon cards from the point of view of a psychtoolbox user (I will say I've played around with the visionegg and quite like it).

I was using the Radeon (9000) to do 10-bit graphics (we've since changed to the Bits++, which are MUCH better imho) on a PowerMac g4 running Matlab 5.2.2 and all under system 9. All the tests for "ten-bitted-ness) checked out. It can be done, but I'm not sure where ATI is at with their PC/Mac OS X drivers.

Hope this helps somewhat.

Best,

Chris


On 10-Aug-04, at 3:00 AM, FreeLists Mailing List Manager wrote:

visionegg Digest    Mon, 09 Aug 2004    Volume: 03  Issue: 044

In This Issue:
        [visionegg] Re: 10-bit framebuffers

----------------------------------------------------------------------

Date: Mon, 09 Aug 2004 18:56:25 -0700
From: Martin Spacek <mspacek@xxxxxxxxxxxxxxx>
Subject: [visionegg] Re: 10-bit framebuffers

Hi Andrew,

Well, I got this not-so-useful reply from ATI:

Regarding 10-bit frame buffer support.

The RADEON 9800 products all offer 10-bit frame buffer support. In 

regards >to developing with OpenGL you can refer to the Developer
Relations >department.  Please visit their portion of the ATI website at

http://www.ati.com/developer/index.html


Regards,

Kyra Plouffe
Customer Care
ATI Technologies, Inc.
http://www.ati.com



ATI seem to lump 10-bit frame buffer support under the term
"Smartshader":

http://ati.com/companyinfo/glossary/includes/list.html#smartshader

From what I can tell, "Smartshader" has been supported in both D3D and 

OpenGL since the release of ATI's Catalyst 3.8 drivers:

http://www2.ati.com/drivers/catalyst_38_release_notes.html#168664

This occurred back in Oct. 2003:

http://www.ati.com/companyinfo/press/2003/4694.html

less than a year ago. So, perhaps the 10 bit framebuffers are now
supported in the OpenGL drivers. Either way, we're about to buy the
card. We'll give it a try and report what we find.

Cheers,

Martin Spacek
PhD student, Graduate Program in Neuroscience
Dept. of Ophthalmology and Visual Sciences
University of British Columbia, Vancouver, BC, Canada
604-875-4555 ext. 66282
mspacek@xxxxxxxxxxxxxxx
http://swindale.ecc.ubc.ca

----- Original Message -----
From: "Andrew Straw" <astraw@xxxxxxxxxxx>
To: <visionegg@xxxxxxxxxxxxx>
Sent: Thursday, July 29, 2004 11:57 PM
Subject: [visionegg] Re: 10-bit framebuffers


Martin Spacek wrote:

Hello,

There's some mention of 10-bit framebuffer support on the website. 

We're

thinking of getting the ATI Radeon 9800, which claims to have both 10
bit DACs and 10 bit framebuffers, and using this with Vision Egg. Does
anyone have any experience with this? Can we expect to get 2^10 shades
of grey, or are there still OpenGL driver problems as mentioned on the
site?



I've tried and failed to get the 10 bit framebuffers to work in Windows
using OpenGL on both the Radeon 9800 Pro and the Matrox Parhelia.  This
was over a year ago now, though, so times may have changed.  There was a
thread about this on the psychtoolbox list with myself and Jon Peirce,
among others, sometime last year, if you want to read further.

Cheers!
Andrew

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