DOOM 3 & DX9 [Sep 17, 2003, 7:08 pm ET] – Share – Viewing Comments
With all the discussion lately about how Half-Life 2 will run on ATI hardware
compared with NVIDIA accelerators, BonusWeb.cz
shot off an email to id Software's John Carmack to ask how DOOM 3 and other
games are likely to be impacted by the difference between the two graphics
platforms running DirectX 9. Here's how he responded:
Unfortunately, it will probably be representative of most DX9 games. Doom has a custom back end that uses the lower precisions on the GF-FX, but when you run it with standard fragment programs just like ATI, it is a lot slower. The precision doesn't really matter to Doom, but that won't be a reasonable option in future games designed around DX9 level hardware as a minimum spec.
But again, why slow down a card with higher precision that's not needed and give lower precision to another card with no loss in quality. It just seems unfair that a card could perfom even better with no visible costHe is not forcing ATI's to run at higher precision, I believe it just can NOT do lower precision(someone correct me if I am wrong?). Or, if it does lower, it is under 16bit, maybe 12 or 8 bit precision, which does have a noticable difference for what he is doing?
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