Shader Model 3.0 / 2.0 ?

[Evildeus]

I'm interested in the specific of of bith shader models, but when i compare these 2 pages i find some differencies, anyone can clear up things? Are they talking of the same thing?Anything new from the M$ page?

http://www.microsoft.com/whdc/winhec/partners/shadermodel30_NVIDIA.mspx

and

http://www.elitebastards.com/page.php?pageid=4136&head=1&comments=1

Thanks for the help

 

[KimB]

Well, that presentation on SM 3.0 at Microsoft's website was updated as of April 5th, so it's probably correct, even though it differs from the spec currently available from the MSDN. One thing to keep in mind is that the SM 2.0 specs quoted are the minimum, whereas the SM 3.0 specs quoted are probably nVidia's implementation of PS/VS 3.0 (that was an nVidia representative that wrote that document).

It is possible that the instruction counts quoted are misleading, as those could be the maximum number of executed instructions with branching. Or the NV40 could actually support programs longer than 32k instructions.

 

[Evildeus]

That's why i wanted to know if they are talking of the same things, or if MS$ has updated its minimum specs :?

 

[ram]

That's why i wanted to know if they are talking of the same things, or if MS$ has updated its minimum specs :?

the article you found on the MS site is written by Nvidia, not MS.

 

[Evildeus]

Did i say otherwise?

 

[ram]

No, did I say you do?

Looking at the official spec, there is no sign of a spec change:

http://msdn.microsoft.com/library/d...languageshaders/pixelshaders/pixelshaders.asp

I guess the mess comes from the minimim #of instructions executed vs. the minimum #instructions per program.

 

[Evildeus]

Yeah, it seems so. Those are Nv40's specs i suppose then.

 

[KimB]

Well, except for the specs on the WinHEC page are above the maximum PS/VS 3.0 specs.

 

[MDolenc]

Well I haven't downloaded newest DX SDK (bad me ), but I don't think that specs for 3.0 shader model have changed (and thus remain in range from 512 instructions up to 32K instructions). Of course we don't know if there is talk about instructions executed or instruction slots. However even minimal VS/PS 3.0 implementation would be capable of 64K+ executed instructions since branching is required both in pixel and vertex shaders.

 

[Reverend]

An article detailing the MSDX specs of both models (and hence the differences) would be mildly useful at this site.



And no, I won't do it... too fucking lazy. Not too interested (in anything 3D or this site) at the moment in any case.

PS. Oops, I used the f word.

 

[Pete]

PS. Oops, I used the f word.

Rest assured the FCC has been duly notified. You're just lucky it wasn't a nipple ring you let pop out.

 

[k19_gzeasy]

Is anybody know NV40 performance in SM 3.0 ?

 

[Evildeus]

Is anybody know NV40 performance in SM 3.0 ?

I'm sure some people know .... under NDA

 

[GraphixViolence]

That assumes someone's got real games to test that actually use SM3.0 features. In other words, nothing that's currently available.

 

[John Reynolds]

That assumes someone's got real games to test that actually use SM3.0 features. In other words, nothing that's currently available.

Far Cry 1.1 supports PS 3.0.

 

[ben6]

Well keep in mind that I believe that's with loops/branches. The OpenGL spec says 16K instructions

 

[Ylandro]

That assumes someone's got real games to test that actually use SM3.0 features. In other words, nothing that's currently available.

Far Cry 1.1 supports PS 3.0.

Might be supporting it... but does it really use it's features?

Seems to me, Farcry is developed purely for PS2. You can compile it supporting PS3, but does that gain anything?

 

[John Reynolds]

Might be supporting it... but does it really use it's features?

Seems to me, Farcry is developed purely for PS2. You can compile it supporting PS3, but does that gain anything?

I've been wondering about that myself. The NV40 previews should tell us.

 

[k19_gzeasy]

That assumes someone's got real games to test that actually use SM3.0 features. In other words, nothing that's currently available.

Far Cry 1.1 supports PS 3.0.

Might be supporting it... but does it really use it's features?

Seems to me, Farcry is developed purely for PS2. You can compile it supporting PS3, but does that gain anything?

yeah,I agree with you,farcry can support PS3,but it would't use PS3 features

 

[ninelven]

Well, surely it does something otherwise why even bother.