Platform/GFX/2011-August-15

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Minutes

Should the Cairo update be backed out? (jrmuizel)
- Chris Jones points out that a lot of mobile bugs and even some X bugs were fixed by the Cairo update. The biggest set of fennec problems was worked around by bug 637828 though.
- jrmuizel doesn't want to back out, and cjones strongly doesn't want to back out.
- It doesn't really seem like the bugs are severe enough to warrant a backout. Jeff will continue fixing the bugs.
- The crash bug is most severe, but we understand it.
- dependent bugs: bug 666893
Azure update (Bas)
- Thebes wrapper depends on the Cairo D2D backend, and therefore will be a little delayed.
- Joe's going to work on the Cairo D2D backend this week.
- Azure on Fx7?
  - There's one semi-rare crash that we can't reproduce (bug 676690). We might be able to work around it, though.
  - ClearType isn't supported in Azure. We made this choice on purpose to speed things up for the implementation of Azure-D2D. There are various mitigation strategies, including using the Cairo implementation of canvas in moz-opaque situations.
  - Bas to collect regressions and link them to the original Azure D2D bug (bug 651858).
D3D9 TP4 regression (benwa)
- bug 660264
- Two issues:
  - System patch(es) (windows, drivers, directx) should fix the regression.
    - We know the union of all the patches available fixes this Tp4 regression. What we don't know is which specific patch or subset of patches fixes the regression.
    - We took an educated guess that it was the driver update, and we were wrong.
    - Current guess is windows update
    - Will check out a talos machine to confirm
  - The regression isn't seen on tp5
Cross-process D3D10 landed (cjones)
- Context given here: Electrolysis/Short_Terms_Goals
- bug 648484
- landed, stuck this time
- follow-up bugs for proper synchronization linked above; painting is racy right now
- needs performance analysis
- security review tentatively proposed for Sept. 13th, 1000 PDT
- OpenGL sharing on Mac is still an open problem, but /should/ work out of the box. Needs mac-specific optimizations though
  - Nominations for victim: BenWa or mattwoodrow
WebGL Antialiasing update (jgilbert)
- Down to one webgl conformace suite regression
For the love of all that is holy, book your all-hands travel if you are going to it. (joe)
- Friday is the last day, though it may be less structured than the other days. 4pm-ish looks to be the last scheduled time.
TestPilot DirectWrite font rendering survey (joe/jdaggett)
- John to email Jono today.
Web3D Community Working Group (Bas)
- There is a group of people from Web3D (the group that originated with VRML) who are working on a declarative 3D web standard.
- http://www.x3dom.org/x3dom/w3c/charter/ - W3C Incubator group for the nascent standard.
- Bas thinks we should send a representative to the working group in order to steer it towards something that we feel better with.
- Bas will go. No one else is very interested/believes in it
SIGGRAPH wrap-up (Bas, joe)
- Scaleform
  - Triangulation with 1 pixel border for AA (sounds the same as D2D)
  - Batching is important (retained-mode API)
- GPUs continue to execute branches in the "old style" - that is, masking off the ALUs that missed the branch, and executing in lock step across the entire SIMD unit.
  - This has different implications depending on the architecture. NVIDIA is bigger but wider (eg ~16-32 threads executing on the same processor); AMD the opposite.
- Web3D consortium has implemented a bunch of things on top of WebGL
- Deferred shading via cached fragments on every triangle; gets shading down to about 1-2x per pixel vs 20+
- If you have any questions, desire for citations or desire for a paper, please contact Joe <joe@mozilla.com>

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