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Stanza

Nvidia and DXT1

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I've been looking for more info on the old problem Nvidia had with DXT1 compression. Sadly google isn't being helpful on this, since it just turns up links to 5-year-old postings on the subject and lots of references to Nvidia's DXT utility. Has this problem been fixed on current Nvidia hardware? Is there a list somewhere for which flavours of their hardware do/don't have the problem?

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Apparently, it was an old bug in the actual hardware (I believe GF3 series). At that time, they solved the problem by having the driver convert the bits manually to DXT3/5, since the hardware worked fine with that.

The problem has since been corrected in recent hardware generations.

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Also, according to recent talk on DIRECTXDEV, GeForceFX cards also have an issue with DXT1, where they decompress it to 16 bits, instead of the 32 it should be. From what I understand from the posts there, this has also been fixed in a driver.

Hope this helps.

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