Agenda

submodule update workflow
release engineering
Skia GL work

Attending

azita, brson, patrick, dherman, jack, seth

Submodule updates

jack: new submodule update process: make pull requests to submodules, then servo. reviewer is repsonsible to merge all < missed >
brian: have we given samsung the permissions we promised?
jack: not yet
jack: should I add them to mozilla-servo?
brian: yes
pcwalton: yes
jack: i will add them today

Release Engineering

jack: any news here?
brson: things are progressing. ben has a ticket open and has been doing stuff. there's nothing for us to do for now.

Color packing

jack: Need to be able to test this color packing issue on Android
jack: Talked to young-il about this and he's going to have Android patches landing soon
jack: We're going to want automation for Android
jack: Same for Rust, we don't have automation there.
jack: Everything I'm touching involves Android
jack: We haven't talked to Ben About Andrdoid?
brian: No
jack: Maybe we can set up a meeting with him?
brian: Ok, I'll do that.

android

brson: young-il asked how to integrate android into the build. he is probably going to be directly working on our makefiles. it will take some major surgery.
jack: we'll have to do similiar work when we integrate windows into the build
jack: somebody has been working on Rust windows support recently so hoping they iron out some of those issues
brson: That's Thad. He's woring on cygwin support. Probably won't affect us since we won't want to build under cygwin normally.

unsafe

jack: Added a lint pass for 'unused unsafe' so I got rid of all of them
jack: unfortunately there are a bunch of them flagged that actually are unsafe (C FFI)
jack: It still compiles if I remove unsafe
pcwalton: It's a bug
jack: Seems fairly serious to me. #6030
jack: Is there a way to move this to the front of the queue?
pcwalton: I can take a look at it today.

GL

jack: I can run skia GL work by you
brson: What's needed for GL updates?
jack: Have to pass in frame buffer that already exists...
jack: no way to share GL context in skia, so even if you have a framebuffer none of these other GL contexts can get it
jack: so I added shared GL contexts to skia
pcwalton: eventually we won't need it. use platform-specific ways to send textures without shared contexts. shared contexts on some platforms will hurt parallelism because shared GL contexts use locks
pcwalton: want to use sharegl to share textures between processes
jack: mac only?
pcwalton: can also use on X
jack: anyway, changed skia's draw target to render to a texture. now need to render from that texture to servo context
jack:
pcwalton: Encoding lifetimes is going to be fun. At some point we're going to want to make this same.
jack: So azure is not used on Android at all?
pcwalton: Not used for content but used for canvas
pcwalton: Apparently opinions differ on the gfx team but I think GPU rendering is going to be the future
pcwalton: Jeff Gilbert, Andreas agree. I don't see any technical reason not to do it from the start
jack: It makes sense so we don't have to upload the final textures to the GPU
pcwalton: Uploading huge buffers is slow on mobile
jack: The CreateSkiaDrawTargetForFBO stuff in azure seems incomplete
pcwalton: It wouldn't surprise me. Azure is still a WIP.
jack: Should we be worried about texture memory available on mobile devices? We're putting every layer in the GPU
pcwalton: Today we're uploading large textures. We'll also be adding font atlasses. Hopefully skia is smart enough to manage that. Certainly we're going to need to add tiles so we don't render the entire page.
jack: I assumed that, when the image layer is decoded, we'll set the layer to that image
pcwalton: We don't want to do that because layers are always uploaded
jack: Maybe we should back up. What is a layer?
jack: You are saying that the entire page is rendered to a single layer
pcwalton: Usually, yes. There are some cases, liked position: fixed where browsers make extra layers
jack: What happens when we add WebGL? If we are using lots of GPU memory then that imposes on WebGL
pcwalton: yes, I don't know what other browsers do
jack: Could switch to software rendering when using WebGL
pcwalton: something we could try first is to tell skia to lower it's cache limits while running WebGL
jack: Something to consider for the future