[web] Fallback to CanvasKit when WebGL is not available #173629
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It looks like this pull request may not have tests. Please make sure to add tests or get an explicit test exemption before merging. If you are not sure if you need tests, consider this rule of thumb: the purpose of a test is to make sure someone doesn't accidentally revert the fix. Ask yourself, is there anything in your PR that you feel it is important we not accidentally revert back to how it was before your fix? Reviewers: Read the Tree Hygiene page and make sure this patch meets those guidelines before LGTMing.If you believe this PR qualifies for a test exemption, contact "@test-exemption-reviewer" in the #hackers channel in Discord (don't just cc them here, they won't see it!). The test exemption team is a small volunteer group, so all reviewers should feel empowered to ask for tests, without delegating that responsibility entirely to the test exemption group. |
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This pull request introduces a fallback mechanism from the Skwasm renderer to CanvasKit when WebGL is not available in the browser. This is achieved by adding a WebGL version detection utility in browser_environment.js. The loader logic in loader.js is then updated to use this information to determine if the Skwasm renderer is supported. The changes are well-implemented, targeted, and correctly address the issue. The associated TypeScript type definitions are also updated accordingly. The code quality is good, and I have no suggestions for improvement.
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Big thanks for fixing. |
Roll Flutter from e2a347b14a18 to 34c2a3b158b2 (41 revisions) flutter/flutter@e2a347b...34c2a3b 2025-08-13 [email protected] [ Tool ] Mark Linux_pixel_7pro linux_chrome_dev_mode as bringup (flutter/flutter#173646) 2025-08-13 [email protected] [ Widget Preview ] Move `--dtd-url` from a global flag to a `widget-preview start` option (flutter/flutter#173712) 2025-08-13 [email protected] Null aware elements clean-ups (flutter/flutter#173074) 2025-08-13 [email protected] Roll Skia from 29e3e1ab7f62 to f7fdda3cd0e6 (3 revisions) (flutter/flutter#173709) 2025-08-13 [email protected] Regular windows win32 engine (flutter/flutter#173424) 2025-08-13 [email protected] Roll Dart SDK from a098cb676fd6 to 73153bdc1459 (1 revision) (flutter/flutter#173708) 2025-08-13 [email protected] Roll Fuchsia Linux SDK from vgv-rTf7i9PfcDq2Y... to I1TfNmsqTp7t3rO8e... (flutter/flutter#173690) 2025-08-13 [email protected] Roll Skia from 1170405c30cf to 29e3e1ab7f62 (2 revisions) (flutter/flutter#173689) 2025-08-13 [email protected] Roll Dart SDK from e2b7aec7333e to a098cb676fd6 (4 revisions) (flutter/flutter#173683) 2025-08-13 [email protected] Roll Skia from d06fdf03c6a1 to 1170405c30cf (4 revisions) (flutter/flutter#173681) 2025-08-13 [email protected] Roll Skia from 9ed4b4e53db2 to d06fdf03c6a1 (11 revisions) (flutter/flutter#173661) 2025-08-12 [email protected] Fix GTK redraw call being called from non-GTK thread. (flutter/flutter#173602) 2025-08-12 [email protected] [Impeller] Apply Y coordinate scaling when sampling from the destination texture in framebuffer advanced blends (flutter/flutter#173639) 2025-08-12 [email protected] Fix directional focus in nested scrollables with different axis (flutter/flutter#172875) 2025-08-12 [email protected] [ios][tools]do not log "bonjour not found" at all (unless verbose) (flutter/flutter#173569) 2025-08-12 [email protected] Remove jetifier usages (flutter/flutter#173548) 2025-08-12 [email protected] [ Tool ] Fix run_linux_chrome_dev_mode (flutter/flutter#173647) 2025-08-12 [email protected] [ios] Update iOS code signing CIPD instruction command (flutter/flutter#171173) 2025-08-12 [email protected] Reapply "Make device debuggable if useDwdsWebSocketConnection is true … (#173551)" (flutter/flutter#173628) 2025-08-12 [email protected] Roll Clang to 8c7a2ce01a77c96028fe2c8566f65c45ad9408d3 (flutter/flutter#173429) 2025-08-12 [email protected] [web] Fallback to CanvasKit when WebGL is not available (flutter/flutter#173629) 2025-08-12 [email protected] Roll Packages from a114ac2 to 08a9b2c (3 revisions) (flutter/flutter#173625) 2025-08-12 [email protected] [ Tool ] Fix crash from possible DDS startup race (flutter/flutter#173362) 2025-08-12 [email protected] Roll Skia from a2936eff2179 to 9ed4b4e53db2 (3 revisions) (flutter/flutter#173611) 2025-08-12 49699333+dependabot[bot]@users.noreply.github.com Bump actions/checkout from 4 to 5 in the all-github-actions group (flutter/flutter#173606) 2025-08-12 [email protected] Roll Dart SDK from c5fe48aee60d to e2b7aec7333e (1 revision) (flutter/flutter#173604) 2025-08-12 [email protected] Roll Skia from 44bb9d908ee4 to a2936eff2179 (21 revisions) (flutter/flutter#173603) 2025-08-12 [email protected] Fix the issue of over-scrolling in SliverMainAxisGroup with a PinnedHeaderSliver. (flutter/flutter#173349) 2025-08-12 [email protected] Roll Dart SDK from b2a23936f968 to c5fe48aee60d (2 revisions) (flutter/flutter#173596) 2025-08-11 [email protected] Update CanRenderTiledTexture unit tests (flutter/flutter#173553) 2025-08-11 [email protected] Update integration test for iOS deployment workflows (flutter/flutter#173566) 2025-08-11 [email protected] Enables vulkan for PowerVR B-Series (flutter/flutter#173561) 2025-08-11 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Reapply "Make device debuggable if useDwdsWebSocketConnection is true … (#173551)" (#173568)" (flutter/flutter#173587) 2025-08-11 [email protected] Roll Dart SDK from 8e882349fcab to b2a23936f968 (2 revisions) (flutter/flutter#173571) 2025-08-11 [email protected] Reapply "Make device debuggable if useDwdsWebSocketConnection is true … (#173551)" (flutter/flutter#173568) 2025-08-11 [email protected] Update CI iOS tests (flutter/flutter#173563) 2025-08-11 [email protected] Roll Packages from 34948d1 to a114ac2 (4 revisions) (flutter/flutter#173556) 2025-08-11 [email protected] Roll Fuchsia Linux SDK from HclTm0V8hgSpfqmtG... to vgv-rTf7i9PfcDq2Y... (flutter/flutter#173505) 2025-08-11 [email protected] Roll Dart SDK from 6a7ae1ffd1c9 to 8e882349fcab (2 revisions) (flutter/flutter#173499) 2025-08-11 [email protected] Update `ExpansibleController` in `ExpansionTile` `didUpdateWidget` (flutter/flutter#173175) 2025-08-11 [email protected] add format cmd to tools instruction (flutter/flutter#173428) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-packages Please CC [email protected],[email protected] on the revert to ensure that a human ...
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@mdebbar with this fix, should we no longer see this warning printed? Browser warning: [GroupMarkerNotSet(crbug.com/242999)!:A0F02200A4000000]Automatic fallback to software WebGL has been deprecated. Please use the --enable-unsafe-swiftshader (about:flags#enable-unsafe-swiftshader) flag to opt in to lower security guarantees for trusted content. I'm seeing this in latest master on GitHub Ubuntu machines where I'm trying to debug some failures, and in the screenshots DevTools is rendering blank, although I don't know if that's the cause of my failure. I also wonder whether this might be related to Dart-Code/Dart-Code#5659 where users have reported blank DevTools on Ubuntu 25 (which I can reproduce in a VM - my mouse cursor changes so the app is definitely running, but nothing is rendering). According to this comment that's only happening with the Wayland display server, but as someone who doesn't use Linux much I don't know what this really means 🙃 |
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If you are not seeing a skwasm error like this: then your issue is probably unrelated to this PR. That said, there was a bug in Chrome that was causing Flutter Web to render blank screens: #171402. The bug has been fixed: https://chromium-review.googlesource.com/c/chromium/src/+/6689314 but I'm not sure which version exactly has the fix. Did you try with latest Chrome? |
Ah, thanks! VS Code is using Electron and they lag behind Chrome a bit, I wonder if this could be related (the issue is when embedded in VS Code, it's fine outside). Was this wasm-specific or could it affect canvaskit? (I think we're actually not using wasm in the cases where this fails). |
Yes, I believe that issue affects CanvasKit as well. |
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@eyebrowsoffire thanks! Do you know how I would figure out which Chrom(e/ium) version contains the fix? |
…ter#173629)" This reverts commit f63cb75. I'm trying to get wasm tests to work locally again.
…tter#173629)" This reverts commit ebb7ee9. I reverted that as a test and forgot about it (it did succeed in letting the tests pass, though). Let's see if this passes now with the latest master, which I'll merge in after this commit.
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Fixes #173401