Platform/GFX/WebRender2020 Q2

WebRender Q2 2020

The purpose of this document is to highlight our priorities for WebRender in Q2 of 2020

Where have we shipped WebRender?

For a list of the various places we have shipped WebRender, see: https://wiki.mozilla.org/Platform/GFX/WebRender_Where

We are also currently working on a WebRender dashboard, this is very much a WIP

Core Priorities

Shipping WebRender

We want to keep shipping WebRender to as many targets as possible each quarter.

Q2 will be the quarter where we start shipping WebRender on more Intel laptops (Win10). This is a critical next phase of the project as this represents a significant portion of the desktop population.

It is important to note: we expect to encounter fallout bugs in release once we start shipping to more Intel. So our plan for Q2 includes holding off shipping to new platforms for at least one target while we focus on bug fixing. If that turns out to not be necessary, we will adjust plans as necessary.

Windows10 will also remain as our priority platform for the quarter, and we will start assessing additional platforms pending our overall progress.

Below is a list of releases in Q2 and what we are aiming to ship per release:

75 (April 7)

• Desktop
  • Direct Composition (needed to unblock more Intel laptops)
    • Specifically to Win10 and newer Intel Graphics cards

76 (May 5)

• Desktop
  • Intel Laptops
    • Single modern Intel GPU's, small screens, with batteries and modern drivers and Win10 (latest build)

• Android
  • Pixel 2/3 (TBD based on Fenix schedule and perf sign-off)

77 (June 2)

• Potentially hold off on shipping to address Intel-specific fallout bugs

78 (June 30)

• Desktop
  • Additional Intel targets (to be specified later)

• Android
  • Further targets TBD based on overall Android planning

As part of this effort, we will need to monitor and fix any critical correctness or perf bugs that appear that could potentially block shipping those targets or could impact users in release.

Unblock more Intel

The oldest version on Intel cards that we expect to be able to support with WebRender is Gen 4.5 Anything older than that will get Software WebRender.

We expect the work that we did in Q1 to enable us to ship WebRender to Gen 8 and Gen 9 Intel cards. In Q2, we will prioritize work that will help us ship from Gen 7.5-4.5

We will track that work under our wr-perf-p1 Metabug: wr-perf-p1

Full Query

Type	ID	Summary	Assigned to	Priority
defect	1664478	Blend modes and other effects on a single image force an extra intermediate target		P2
enhancement	1404477	Chrome repaints cause rebuilds of the entire browser scene		P3
defect	1595680	Slightly different values in display lists causing extra picture cache invalidations.		P3
defect	1595909	Image masks with different keys being added during scrolling		P3

4 Total; 4 Open (100%); 0 Resolved (0%); 0 Verified (0%);

Software WebRender

Goals for Q2 for Software WebRender

• Fix Correctness issues
• Fix failing Wrench reftests
• Understand performance bottlenecks and fix them

April Milestone

Details of our April Milestone can be found here

WR Perf

We are also performing regular triage of perf-specific bugs, those are visible: https://wiki.mozilla.org/Platform/GFX/perf_triage

Other Platforms

In addition to Windows and Android, we do also want to ship WebRender on Mac and Linux as well. Windows will still be our main focus in Q2, if we have time we will start looking at Mac more closely.

Tracking

We are currently using GitHub's project feature to track our high-level roadmaps

• WebRender quarterly breakdown: https://github.com/orgs/FirefoxGraphics/projects/4
• WebRender overall roadmap: https://github.com/orgs/FirefoxGraphics/projects/1