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pcwalton's profile
Patrick Walton
Patrick Walton
Patrick Walton
@pcwalton

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Patrick Walton

@pcwalton

Research engineer at Mozilla

San Francisco, CA
pcwalton.github.io
Joined November 2009

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    1. Patrick Walton‏ @pcwalton 21 Nov 2019
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      Replying to @pcwalton @rikarends @chadaustin

      (Also I'm unsure how reliable texture from pixmap is with EGL, especially on NVIDIA. There is usually only one way that actually works.)

      1 reply 0 retweets 1 like
    2. Rik Arends‏ @rikarends 21 Nov 2019
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      Replying to @pcwalton @chadaustin

      I wouldn't know when i'd need texture from pixmap, is that to upload textures from system ram? Or something more specific.

      1 reply 0 retweets 0 likes
    3. Patrick Walton‏ @pcwalton 21 Nov 2019
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      Replying to @rikarends @chadaustin

      It's for sharing textures across threads/processes. Support for that is the main reason why I'm writing a glutin replacement right now.

      2 replies 0 retweets 0 likes
    4. Anthony Ramine‏ @nokusu 22 Nov 2019
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      Replying to @pcwalton @rikarends @chadaustin

      I thought there won’t be any cross-process texture sharing on macOS anymore?

      1 reply 0 retweets 0 likes
    5. Alan Jeffrey‏ @asajeffrey 22 Nov 2019
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      Replying to @nokusu @pcwalton and

      It uses surfaces as a way to safely share send texture data between threads. Happier?

      1 reply 0 retweets 0 likes
    6. Anthony Ramine‏ @nokusu 22 Nov 2019
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      Replying to @asajeffrey @pcwalton and

      Oh cross threads! Ok that makes more sense.

      1 reply 0 retweets 0 likes
    7. Alan Jeffrey‏ @asajeffrey 22 Nov 2019
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      Replying to @nokusu @pcwalton and

      Servo makes sure that any threads using the GPU are all in the same process. There might be clever way to get surfaces sent between processes, but we're not using it.

      1 reply 0 retweets 0 likes
    8. Anthony Ramine‏ @nokusu 22 Nov 2019
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      Replying to @asajeffrey @pcwalton and

      There are definitely support for IPC surfaces in the serde serialisation stuff, and we mark surfaces on macOS global for that very purpose. Glad to know we don’t actually use that though.

      1 reply 0 retweets 0 likes
    9. Patrick Walton‏ @pcwalton 22 Nov 2019
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      Replying to @nokusu @asajeffrey and

      There are ways to send surfaces cross-process on each OS. In fact, they're basically the same ways surfman sends them across threads. They require some extra APIs surfman doesn't use yet, though. e.g. on macOS you can convert an IOSurface to a Mach port and back.

      2 replies 0 retweets 0 likes
    10. Anthony Ramine‏ @nokusu 22 Nov 2019
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      Replying to @pcwalton @asajeffrey and

      Anthony Ramine Retweeted Patrick Walton

      Didn't you tell me we won't do that anymore, because we need to make the surfaces global so that any process can access them, if we don't use XPC services on macOS? Did I misunderstand something?https://twitter.com/pcwalton/status/1172905803524653056 …

      Anthony Ramine added,

      Patrick Walton @pcwalton
      Replying to @nokusu
      I don’t think we need to transfer IOSurfaces between processes anymore?
      1 reply 0 retweets 0 likes
      Patrick Walton‏ @pcwalton 22 Nov 2019
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      Replying to @nokusu @asajeffrey and

      There's an API to convert a surface to a Mach port and back, as I recall. I believe XPC services is built on Mach ports anyway.

      9:59 AM - 22 Nov 2019
      1 reply 0 retweets 0 likes
        1. New conversation
        2. Anthony Ramine‏ @nokusu 22 Nov 2019
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          Replying to @pcwalton @asajeffrey and

          AFAIK to be able to use Mach ports that way, you need to go through XPC or make the thing global.

          1 reply 0 retweets 0 likes
        3. Anthony Ramine‏ @nokusu 22 Nov 2019
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          Replying to @nokusu @pcwalton and

          https://searchfox.org/mozilla-central/source/gfx/2d/MacIOSurface.cpp#61 …

          1 reply 0 retweets 0 likes
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