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Nvidia's David Kirk on PS3 and the future of PC - tech|
(hx) 05:54 PM CEST - Jul,11 2005 | Bit-Tech
has posted
an interview with the Chief Scientist of graphics firm Nvidia, David Kirk
(they guy behind the RSX graphics chip in the PS3 and the latest GeForce 7800
graphics chip) talking about the upcoming console war and on what the next big
thing in PC gaming graphics is going to be. Here's a taster:
Using AA with HDR
For those of you with super-duper graphics cards, you will have come across a
problem: you can't use Anti-Aliasing when using HDR lighting, for example in Far
Cry. In these cases, it's a situation where you have to choose one or the other.
Why is this, and when is the problem going to get solved?
"OK, so the problem is this. With a conventional rendering pipeline, you render
straight into the final buffer - so the whole scene is rendered straight into
the frame buffer and you can apply the AA to the scene right there."
"But with HDR, you render individual components from a scene and then
composite them into a final buffer. It's more like the way films work, where
objects on the screen are rendered separately and then composited together.
Because they're rendered separately, it's hard to apply FSAA (note the
full-screen prefix, not composited-image AA! -Ed) So traditional AA doesn't make
sense here."
So if it can't be done in existing hardware, why not create a new hardware
feature of the graphics card that will do both?
"It would be expensive for us to try and do it in hardware, and it wouldn't
really make sense - it doesn't make sense, going into the future, for us to keep
applying AA at the hardware level. What will happen is that as games are created
for HDR, AA will be done in-engine according to the specification of the
developer.
"Maybe at some point, that process will be accelerated in hardware, but that's
not in the immediate future."
But if the problem is the size of the frame buffer, wouldn't the new range of
512MB cards help this?
"With more frame buffer size, yes, you could possibly get closer. But you're
talking more like 2GB than 512MB."
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last 10 comments: tub0rg | (07:14 PM CEST - Jul,11 2005 ) | A real interesting article, and of course the explanation for the 2 seperate strategies of the xbox 360 and the ps3. while the xbox 360 goes for free anti aliasing by architecture wich cant be used in hdr rendering, the ps3, like they said in the presantation at the e3 are going to focus on hdr rendering.
i admit its a tough choice, but given the high resolution the next gen cons running i probably would go for the hdr rendering and trash the aa. hdr especially with shaders 3 just can look amazing. | |
Nosferatu | (11:05 AM CEST - Jul,12 2005 ) | As to combining AA and HDR is impossible, you probably didn't get it right. He said it was TOO EXPENSIVE to do on PC HARDWARE, but not impossible. And come on!!! Everyone sees how much does HDR matter, do you think Microsoft and ATI would have dropped its support? Heh, they're not too stupid... I hope :-)
And then they did say they support 64bit HDR (while PS3 can handle 128bit HDR, I suppose), so there won't be next-gen games without HDR on Xbo360.
P.S: Gears of War is a smash title for Xbox360 and it's built on UnrealEngine3, which was spoken about in this interview as an engine that is built "with HDR from the start". | |
tub0rg | (02:14 PM CEST - Jul,12 2005 ) | i didnt say the xbox360 was incapable of doing it... as well as the ps3 isnt incapable of anti aliasing but the for free aa by the xbox 360 as well as any other hardware acceleretet anti aliasing today is im possible to use in hrd rendering today. but the xbox has the 4x aa for free wich is of course a good thing, since they focused on hdr rendering in the ps3 they couldnt use such a feature of course...unless they would pack 2gb gpu ram in wich we probably wont see untill next next gen :)
quote: so there won't be next-gen games without HDR on Xbo360
well if that were true xbox's anti aliasing for free would be a shit in the bucket so i seriosly doubt it....
unless off course .. if you call next gen games only the ones based on the new engines like ue3 well that enige was build for hdr so of course it will run hdr on xbox360. but imho any game realeased on xbox 360 and ps3 is a next gen game... as well as there are game today without normal mapping there will be games on the next gen consoles without hdr. | |
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