Pixel Shader v1.1 vs v1.3 - Do Any Cards Only Support v1.1?

[Pit_Viper]

Greetings all,

Support for Pixel Shader 1.1 seems to be a trend with software that supports DirectX 8.1 Pixel Shaders. I was curious as to why Pixel Shader 1.3 isn't used as the base standard for DirectX 8.1 cards - are there some cards that support Pixel Shader 1.1, yet don't support Pixel Shader 1.3? Off-hand, I cannot think of any such cards...

Thanks in advance...

 

[arjan de lumens]

GeForce3 cards are limited to PS1.1.

 

[NeARAZ]

Re: Pixel Shader v1.1 vs v1.3 - Do Any Cards Only Support v1

1.3 isn't used as the base standard for DirectX 8.1

Plus, 1.3 (and 1.2 for that matter) only give you several additional "hacks" over ps1.1 (dp4, modify depth, etc.). In most cases, either 1.1 is sufficient (so there's no need to use higher model), or 1.1 AND 1.2 AND 1.3 aren't sufficient. Pixel shader 1.4 is a different story (it's a whole new model).

 

[Pit_Viper]

GeForce3 cards are limited to PS1.1.

I have already searched for an answer regarding the Pixel Shader support of the Geforce 3, and I always come up with conflicting information regarding this topic. It mentioned in this link, for example, that the Geforce 3 supports Pixel Shader 1.3:

http://www.gamers-cy.com/modules.php?name=News&file=article&sid=367

 

[pcchen]

GeForce 3 does not support PS 1.3.
Actually GF3 supports the "Z modify" instruction in PS 1.3, but it lacks some instructions in PS 1.2, and PS 1.3 requires PS 1.2. So GF3 is not able to support PS 1.3.

By the way, I believe that some chips from SiS (Xabre ???) also support PS 1.1 only.

 

[embargiel]

GeForce3 cards are limited to PS1.1.

I have already searched for an answer regarding the Pixel Shader support of the Geforce 3, and I always come up with conflicting information regarding this topic.

Yeah, but GF3 does not support Pixel Shader 1.3. The other question is that whether or not XGPU supports Pixel Shader 1.3.

 

[Pit_Viper]

Yeah, but GF3 does not support Pixel Shader 1.3. The other question is that whether or not XGPU supports Pixel Shader 1.3.

The XGPU does not support Pixel Shader 1.3 with regards to the exact specifications, from my understanding. It supports a Pixel Shader 1.1 variant (with different mnemonics, 9 instructions maximum) that is more or less functionally equivalent to Pixel Shader 1.3. I don't think any documentation regarding the shader mnemonics is readily available to the general public. (Somebody correct me if I'm wrong with respect to any of the aforementioned points.)

 

[Freak'n Big Panda]

uum whats the XGPU? I've never herd the name mentioned before. Is it the GPU in the xbox? Cause I thought that was NV2A

 

[Xmas]

By the way, I believe that some chips from SiS (Xabre ???) also support PS 1.1 only.

No, Xabre supports PS1.3.

btw: http://www.beyond3d.com/misc/comp.php

 

[StealthHawk]

By the way, I believe that some chips from SiS (Xabre ???) also support PS 1.1 only.

AFAIK the Xabre chips(desktop line at least) support up to PS1.3

 

[parhelia]

Xabre supports PS 1.3

 

[pcchen]

Well, then I don't know any chips other than GF3 series which support PS 1.1 only...

 

[overclocked]

AFAIK/correct me if i´m wrong pixelshaderersion 1.4 is more like 1.8
or something if you just judge by the numbers.

 

[Xmas]

AFAIK/correct me if i´m wrong pixelshaderersion 1.4 is more like 1.8

If PS2.0 were PS3.0, perhaps.

 

[overclocked]

You didn´t get what i meant. Sorry..

 

[Xmas]

You didn´t get what i meant. Sorry..

Care to explain what you did mean?

 

[overclocked]

No you are correct, i meant that that to most people it sound like 1.3-1.4 is very near technical by the numbers but the difference is much bigger hence my 1.8 number.