[CFT] Mesa 18.3.0 update (mesa-libs, mesa-dri, libosmesa, clover)

[Jan Beich]

Kevin Oberman <rkoberman at gmail.com> writes:

> As far as firefox is concerned, I tried running it with the "MOZ" variables
> Jan listed, but I still got the same status message in about:support. I
> also looked though about:config for relevant settings, but came up blank.

That's expected. Environment variables override hardware qualifications.
Whether WebRender is actually in-use is decided by Compositing field.
WebRender (like WebGL 2) requires OpenGL 3.2+ which SandyBridge supports.
If it fails you'd see "unavailable by runtime: WebRender initialization failed".

  $ MOZ_ACCELERATED=1 MOZ_WEBRENDER=1 firefox --new-instance --profile $(mktemp -dt ffprofile) about:support
  [...]
  Features
  ------------------------------------------------------------------------------
  Compositing		WebRender
  ------------------------------------------------------------------------------
  WebGL 2 Driver Renderer	Intel Open Source Technology Center -- Mesa DRI Intel(R) HD Graphics 530 (Skylake GT2) 
  ------------------------------------------------------------------------------
  WebGL 2 Driver Version	4.5 (Core Profile) Mesa 18.3.0
  ------------------------------------------------------------------------------
  [...]
  Decision Log
  ------------------------------------------------------------------------------
  HW_COMPOSITING	blocked by default: Acceleration blocked by platform
  			available by user: Enabled by envvar
  ------------------------------------------------------------------------------
  WEBRENDER		opt-in by default: WebRender is an opt-in feature
  			available by user: Force enabled by envvar
  ------------------------------------------------------------------------------
  WEBRENDER_QUALIFIED	blocked by env: No qualified hardware
  ------------------------------------------------------------------------------

If you're curious how fast WebRender is try toggling gfx.webrender.debug.profiler
which would enable profiling overlay that shows FPS, CPU/GPU usage, etc.