RADV's Navi Support Gets Patches For Vulkan Transform Feedback

[phoronix]

Phoronix: RADV's Navi Support Gets Patches For Vulkan Transform Feedback

The excitement over the open-source AMD Radeon Navi graphics driver support for Linux gamers/users continues. On Tuesday the RADV driver saw support land for binning to boost performance but while Bas was doing that, Samuel Pitoiset of Valve posted patches allowing GFX10/Navi to support Vulkan transform feedback...

http://www.phoronix.com/scan.php?page=news_item&px=RADV-Navi-Transform-Feedback

[shmerl]

Is transform feedback for Vega in radv already using NGG?

[airlied]

Is transform feedback for Vega in radv already using NGG?

Nope it fallsback to non ngg if TF is enabled same as amdvlk does currently

[shmerl]

Nope it fallsback to non ngg if TF is enabled same as amdvlk does currently

Thanks. What exactly is "new generation geometry" by the way?

[ms178]

Nope it fallsback to non ngg if TF is enabled same as amdvlk does currently

Are there plans to implement it for GFX9, too? NGG is one of the promised features which are still missing on Vega.

[airlied]

Are there plans to implement it for GFX9, too? NGG is one of the promised features which are still missing on Vega.

Don't think ngg works well enough of.gives enough benefit on gfx9 to enable it, it's not a feature that is exposed to APIs, so being promised doesn't matter

[airlied]

Thanks. What exactly is "new generation geometry" by the way?

AMD also call it primitive shaders, it's a new pipeline to replace vertex, Tess and geometry with something more efficient

[ms178]

Don't think ngg works well enough of.gives enough benefit on gfx9 to enable it, it's not a feature that is exposed to APIs, so being promised doesn't matter

Thanks for the info, I've read some time ago that they would try to push it into new APIs. But public information on this is scarce and it wasn't clear enough if the hw implementation in GFX9 was the issue or just a question of more effort needed on the software side...

[aufkrawall]

Thanks for the info, I've read some time ago that they would try to push it into new APIs.

Afair they never said that, perhaps it was about "evaluating possibilities". I think Navi is the proof that it was ultimately in a broken or useless form in GFX9.

[ms178]

Afair they never said that, perhaps it was about "evaluating possibilities". I think Navi is the proof that it was ultimately in a broken or useless form in GFX9.

Look at the graph here: http://www.3dcenter.org/dateien/abbi....vorschau2.jpg

This slide tells us: "Exposing primitive shaders to developers requires API changes" - I concluded from this that they will push for these API changes as they would be needed anyways for Navi and beyond...