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December 2016
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airlied [userpic]
radv: status update or is dota2 working yet?

Clickbait titles for the win!

First up, massive thanks to my major co-conspirator on radv, Bas Nieuwenhuizen, for putting in so much effort on getting radv going.

So where are we at?

Well this morning I finally found the last bug that was causing missing rendering on Dota 2. We were missing support for a compressed texture format that dota2 used. So currently dota 2 renders, I've no great performance comparison to post yet because my CPU is 5 years old, and can barely get close to 30fps with GL or Vulkan. I think we know of a couple of places that could be bottlenecking us on the CPU side. The radv driver is currently missing hyper-z (90% done), fast color clears and DCC, which are all GPU side speedups in theory. Also running the phoronix-test-suite dota2 tests works sometimes, hangs in a thread lock sometimes, or crashes sometimes. I think we have some memory corruption somewhere that it collides with.

Other status bits: the Vulkan CTS test suite contains 114598 tests, a piglit run a few hours before I fixed dota2 was at:
[114598/114598] skip: 50388, pass: 62932, fail: 1193, timeout: 2, crash: 83 - |/-\

So that isn't too bad a showing, we know some missing features are accounting for some of fails. A lot of the crashes are an assert in CTS hitting, that I don't think is a real problem.

We render most of the Sascha Willems demos fine.

I've tested the Talos Principle as well, the texture fix renders a lot more stuff on the screen, but we are still seeing large chunks of blackness where I think there should be trees in-game, the menus etc all seem to load fine.

All this work is on the semi-interesting branch of

It only has been tested on VI AMD GPUs, Polaris worked previously but something derailed it, but we should fix it once we get the finished bisect. CIK GPUs kinda work with the amdgpu kernel driver loaded. SI GPUs are nowhere yet.

Here's a screenshot:


Can't let phoronix steal all the comments!

This is extremely awesome! How did you to manage to crank this out in just months?

Re: Nice!

Vulkan API is a lot closer to hardware, so although the API is very broad, it's also quite shallow. So the amount of code between API and hardware is a lot less.

It also helps that there was a full compiler backend and most of the spirv->nir handling done already.