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Old 06-24-03, 04:36 AM   #13
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Added another pickie in my above post.
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Old 06-24-03, 05:40 AM   #14
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I dont understand what you guys are expecting? Turning on DXT compresson _will_ result in a drop of quality, regardless of implementation.

IIRC, wasn't the bug more to do with the alpha formats of DXT? DXT1 has 1 bit alpha, DXT3 has uncompressed alpha, and DXT5 has compressed alpha.

DXT5 looks the best with alpha gradients, as more info can be stored in the compressed 4bits, than uncompressed 4bits.
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Old 06-24-03, 06:28 AM   #15
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Quote:
Originally posted by Nutty
I dont understand what you guys are expecting? Turning on DXT compresson _will_ result in a drop of quality, regardless of implementation.

IIRC, wasn't the bug more to do with the alpha formats of DXT? DXT1 has 1 bit alpha, DXT3 has uncompressed alpha, and DXT5 has compressed alpha.

DXT5 looks the best with alpha gradients, as more info can be stored in the compressed 4bits, than uncompressed 4bits.
You are right, though look at Quake3 qith DXT1 TC enabled in Linux and you will see it looks much better than it does in Windows 9x/NT.

On the last set of message boards there was a massive thread about it.
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Old 06-24-03, 09:26 AM   #16
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Quote:
Originally posted by Nutty
I dont understand what you guys are expecting? Turning on DXT compresson _will_ result in a drop of quality, regardless of implementation.
I think you're right - Maybe we need someone with an ATi board to post the same screenshots with DXTC enabled and disabled, then compare them to the GeForceFX screenshots.
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Old 06-24-03, 09:29 AM   #17
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Quote:
Originally posted by K.I.L.E.R
You are right, though look at Quake3 qith DXT1 TC enabled in Linux and you will see it looks much better than it does in Windows 9x/NT.

On the last set of message boards there was a massive thread about it.
Maybe I'm seeing things, but all my Linux games look better than their Win counterparts. I have a GF3 so I think from reading this topic my DXTC is just broken anyway.
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Old 06-24-03, 10:14 AM   #18
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That screenshot probably isn't the best to judge DXTC compression quality on.

I suggest you use NOLF2 instead, specifically "the death of Cate Archer" cut scene (early in the game - use maphole cheat to skip quickly thru to it). Focus on the ninja's face.

I've attached a jpeg (irfanview quality 85) of how my GF3 renders her.

edit: changed the jpeg to a closeup png because you can't really tell from the jpeg

She looks much better (but not perfect on GF4's I've seen running).
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Old 06-24-03, 07:31 PM   #19
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Quote:
Originally posted by Hanners
I think you're right - Maybe we need someone with an ATi board to post the same screenshots with DXTC enabled and disabled, then compare them to the GeForceFX screenshots.
From what I remember Radeon cards rendered the sky perfectly with DXTC on.
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Old 06-24-03, 10:00 PM   #20
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Quote:
Originally posted by StealthHawk
From what I remember Radeon cards rendered the sky perfectly with DXTC on.
Yes they do. I can post a pic if you like.
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Old 06-24-03, 10:45 PM   #21
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Quote:
Originally posted by StealthHawk
From what I remember Radeon cards rendered the sky perfectly with DXTC on.
That's the problem.
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Old 06-25-03, 04:36 AM   #22
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I have a demo, that shows an image under non-compressed, DXT1, DXT3, and DXT5

download it from

http://opengl.nutty.org/extensions/index.html

Its the 2nd one down. If someone has an ATI card, and could screenshot it in non-compressed, and DXT modes, that would be cool.

requires DevIL image library too;
http://opengl.nutty.org/OpenIL/index.html

BTW, you press space bar to cycles modes, on my Gf3 at work, I can easily see a degradation from non-compressed to dxt.
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Old 06-25-03, 06:12 AM   #23
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Thanks to Stealth, heres some shots taken on an ATI r9500 Pro.

http://opengl.nutty.org/dxt/ATI/DXTComparisonATI.html

You can clearly see a degradation in skin tone when compression is on.

And the comparison page here

http://opengl.nutty.org/dxt/NV/DXTComparisonNV.html

Last edited by Nutty; 06-25-03 at 06:23 AM.
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Old 06-25-03, 06:52 AM   #24
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Just goes to show that DXT1 should not be used on any but the lowest quality and least used textures. It quality is crappy.

DXT3 and DXT5 are the preferred formats. The issue with the Quake sky was that Id used DXT1 when they should have used DXT3.

Can any GF_FX owners and GF4 owners send Nutty some comparison shots?
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