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Tessellation compatibility?

post #1 of 11
Thread Starter 
Ok, I know HD4xxx has hardware tessellation, DX10.1 also, in some form, and I can clearly see it in Crysis 1.

My question is- can that hardware tessellation be used with DX11??
This is a shared feature, so should be compatible, I hear that HD4xxx won't be able to render only "DX11 only" features, and is compatible with features shared between DX10.1 and DX11.

However, i'm hearing mixed opinions.
Can s1 confirm? Thanks.
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post #2 of 11
Thread Starter 
Bump. Anyone?
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post #3 of 11
I don't think so.
Tessellation can pe powered only by dx 11 and not by dx 10.1 and dx 10.
Think about it the dx 11 software works only with dx 11 hardware.
If a video card has "only" dx 11,i doubt that,for a video card to run dx 11 has to know how to run dx 10 and 9,because dx 11 has at it's base dx10 and dx10 has at it's base dx9.
Edited by fonzye - 3/24/11 at 7:33am
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post #4 of 11
Thread Starter 
Quote:
Originally Posted by fonzye View Post
I don't think so.
Tessellation can pe powered only by dx 11 and not by dx 10.1 and dx 10.
Think about it the dx 11 software works only with dx 11 hardware.
If a video card has "only" dx 11,i doubt that,for a video card to run dx 11 has to know how to run dx 10 and 9,because dx 11 has at it's base dx10 and dx10 has at it's base dx9.
No, you misunderstood.
DX10.1 does have tessellation, thats certain.
And DX10.1 and DX11 share a few features, tessellation among which.
Now, it is declared, that DX10.1 hardware will support all DX11 features, which are shared, and will not be able to render the features, which are typical only for DX11.
Tessellation is shared, meaning DX10.1 cards should be able to render tessellation in both DX10.1 and DX11 mode.

However, Tessellation in DX11 is different version, so to say, and even though it is a "shared" feature, it may not be compatible.

So does any1 know if it is?
Can the tessellation renderer on some DX10.1 cards handle the new version tessellation in DX11?
Is it backwards compatible?
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post #5 of 11
I don't think DX10 has Tessellation

Quote:
Tessellation was earlier considered for Direct3D 10, but was later abandoned
http://en.wikipedia.org/wiki/Microsoft_Direct3D
Edited by ACHILEE5 - 3/24/11 at 8:31am
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post #6 of 11
Quote:
Originally Posted by ronnin426850 View Post
No, you misunderstood.
DX10.1 does have tessellation, thats certain.
And DX10.1 and DX11 share a few features, tessellation among which.
Now, it is declared, that DX10.1 hardware will support all DX11 features, which are shared, and will not be able to render the features, which are typical only for DX11.
Tessellation is shared, meaning DX10.1 cards should be able to render tessellation in both DX10.1 and DX11 mode.

However, Tessellation in DX11 is different version, so to say, and even though it is a "shared" feature, it may not be compatible.

So does any1 know if it is?
Can the tessellation renderer on some DX10.1 cards handle the new version tessellation in DX11?
Is it backwards compatible?
Run Heaven and see if It allows tessellation in DX10 mode. There's a start.
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post #7 of 11
DX11 implements a more advanced tesselation that is different enough from DX10.1 for incompatiblity depending on the programming path.
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post #8 of 11
Thread Starter 
Quote:
Originally Posted by DuckieHo View Post
DX11 implements a more advanced tesselation that is different enough from DX10.1 for incompatiblity depending on the programming path.
Thank you!

that's a pity..
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post #9 of 11
Thread Starter 
Sorry for double post..

Quote:
Originally Posted by ACHILEE5 View Post
I don't think DX10 has Tessellation


http://en.wikipedia.org/wiki/Microsoft_Direct3D
Quote:
AMD/ATI demonstrate that tessellation has hardware support on Radeon HD 4800 DX 10.1 and show it in demo Froblins: http: //developer.amd.com/samples/demos/pages/froblins.aspx
http://community.codemasters.com/for...eries-too.html
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post #10 of 11
Quote:
Originally Posted by ronnin426850 View Post
ATI GPUs actually have supported tessellation for like 5+ years....
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