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Zakor Gyula
Oct 29, 2019
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U-Szeged version

This version of WebRender is using next-gen backends (vulkan/dx12/metal) provided by the gfx-hal API.

The current state is experimental. At the moment the vulkan, dx12, and metal backends are usable, but in performance they are behind the original (this year's goal is to change this).

By default this WebRender builds with gfx-hal, but we kept the original OpenGL backend and you can enable it with the gleam feature in WebRender and with the gl feature in Wrench.

To run Wrench reftests e.g. with vulkan backend, use the following comand:

cd wrench
cargo run --features=vulkan reftest

It was tested on Linux (Ubuntu 18.04), Windows 10 and macOS (Mojave).

WebRender

Version

GPU renderer for the Web content, used by Servo.

Note that the canonical home for this code is in gfx/wr folder of the mozilla-central repository at https://hg.mozilla.org/mozilla-central. The Github repository at https://github.com/servo/webrender should be considered a downstream mirror, although it contains additional metadata (such as Github wiki pages) that do not exist in mozilla-central. Pull requests against the Github repository are still being accepted, although once reviewed, they will be landed on mozilla-central first and then mirrored back. If you are familiar with the mozilla-central contribution workflow, filing bugs in Bugzilla and submitting patches there would be preferred.

Update as a Dependency

After updating shaders in WebRender, go to servo and:

  • Go to the servo directory and do ./mach update-cargo -p webrender
  • Create a pull request to servo

Use WebRender with Servo

To use a local copy of WebRender with servo, go to your servo build directory and:

  • Edit Cargo.toml
  • Add at the end of the file:
[patch."https://github.com/servo/webrender"]
"webrender" = { path = "<path>/webrender" }
"webrender_api" = { path = "<path>/webrender_api" }

where <path> is the path to your local copy of WebRender.

  • Build as normal

Documentation

The Wiki has a few pages describing the internals and conventions of WebRender.

Testing

Tests run using OSMesa to get consistent rendering across platforms.

Still there may be differences depending on font libraries on your system, for example.

See this gist for how to make the text tests useful in Fedora, for example.

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A GPU-based renderer for the web

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