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.
Wait, I thought it was a generic path for ATI cards with Doom 3 too, since Nvidia cards can run on the same path but at half speed. If Nvidia didn't have this problem, they'd both be running on the same path, something called ARB2 path, not sure. But if it was a specific path for ATI cards, why would they be able to run Nvidias card with it too then bother to complain it's slower. I think the path ATI is using in D3 is what they meant both cards to run on. But they ended up having to make a nv30 path. If ATI had their own path, wouldn't it be called r300 parth, not that arb2 thing
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