[Impeller] add async command submission for blit pass. #48040
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Test added. |
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Could you edit the PR description to include a bit more details:
- What issue does this close and/or what issue does this work towards?
- What exactly is "async command submission"? Could we link to some background?
(The second one is more for git blame, the first one is more for this review)
impeller/aiks/aiks_unittests.cc
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| @@ -174,18 +175,23 @@ bool GenerateMipmap(const std::shared_ptr<Context>& context, | |||
| return false; | |||
| } | |||
| pass->GenerateMipmap(std::move(texture), std::move(label)); | |||
| if (async_submit) { | |||
| return buffer->SubmitCommandsAsync(pass, context->GetResourceAllocator()); | |||
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Just based off of reading this, maybe it should be EncodeAndSubmitCommandsAsync.
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Yeah that is a good suggestion, i will do that (not today, but when I update this tomrrow) 😄
impeller/entity/entity_pass.cc
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Why is this change unconditional? Do we always want to do this? I guess I'm confused here - is synchronous submission being removed after this lands?
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^ What about this question? LGTM otherwise.
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Ahh yes, we always want to do this. no, its not being removed because it is still useful for workloads that happen outside of the frame workload (like image upload/mipmaps).
There is also no way to create multiple render passes from a single cmd buffer and async submit them, which we don't need to do right now, but only the old API supports that technically.
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Sorry about that, I've updated the description with more details |
jonahwilliams
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…138529) flutter/engine@3cfcdeb...8aff9c1 2023-11-16 [email protected] Roll Dart SDK from cc6acfd7d57c to 5cccc24d127f (1 revision) (flutter/engine#48109) 2023-11-16 [email protected] Roll Skia from 5d6bdbf69dea to add865f891c8 (1 revision) (flutter/engine#48108) 2023-11-16 [email protected] Roll Dart SDK from 65819963fb17 to cc6acfd7d57c (5 revisions) (flutter/engine#48100) 2023-11-16 [email protected] Make `fml/status_or.h` compatible with `.clang_tidy`. (flutter/engine#48002) 2023-11-16 [email protected] [Impeller] Gate Vulkan selection on API 29 (flutter/engine#48089) 2023-11-16 [email protected] [macOS] Clean up allocations in menu plugin test (flutter/engine#48093) 2023-11-16 [email protected] Re-land "Make `fml/...` compatible with `.clang_tidy` (flutter/engine#48030) 2023-11-15 [email protected] [ios] introduce weak_nsobject (flutter/engine#47947) 2023-11-15 [email protected] Roll Skia from e954d1a1972c to 5d6bdbf69dea (2 revisions) (flutter/engine#48094) 2023-11-15 [email protected] [Impeller] add async command submission for blit pass. (flutter/engine#48040) 2023-11-15 [email protected] Make `lib/ui/compositing/...` compatible with `.clang_tidy`. (flutter/engine#48001) 2023-11-15 [email protected] Remove the linux fuchsia v1 build. (flutter/engine#48085) 2023-11-15 [email protected] [web] Apply global styles before inserting the DOM element (flutter/engine#48027) 2023-11-15 [email protected] Roll Skia from b23074a79bda to e954d1a1972c (7 revisions) (flutter/engine#48092) 2023-11-15 98614782+auto-submit[bot]@users.noreply.github.com Reverts "Make `lib/ui/{text|window}/...` compatible with `.clang_tidy`." (flutter/engine#48083) 2023-11-15 [email protected] [ios]fix ios 16 auto correction highlight showing on top left corner (flutter/engine#47279) 2023-11-15 [email protected] Roll Skia from c42226314a4f to b23074a79bda (3 revisions) (flutter/engine#48081) 2023-11-15 [email protected] Make `lib/ui/{text|window}/...` compatible with `.clang_tidy`. (flutter/engine#48000) If this roll has caused a breakage, revert this CL and stop the roller using the controls here: https://autoroll.skia.org/r/flutter-engine-flutter-autoroll Please CC [email protected],[email protected],[email protected] on the revert to ensure that a human is aware of the problem. To file a bug in Flutter: https://github.com/flutter/flutter/issues/new/choose To report a problem with the AutoRoller itself, please file a bug: https://issues.skia.org/issues/new?component=1389291&template=1850622 Documentation for the AutoRoller is here: https://skia.googlesource.com/buildbot/+doc/main/autoroll/README.md
This is a requirement for the "Remove Drawable Acquisition Latency" Change, but is otherwise a harmless improvement.
Submitting a command buffer causes the backend specific encoding logic to run. Metal is unique in that it is fairly easy to move this work into a background thread, allowing the engine to move onto creating the next command buffer. This improves throughput of the engine, at the cost of needing two slightly different APIs. Currently the GLES and Vulkan versions of this method still submit synchronously - for now that is out of scope as doing background work with those APIs has proved more challenging.
See also:
Separately, as a requirement for the design in "Remove Drawable Acquisition Latency", we need to be able to defer drawable acquisition to this background thread. While this almost already works for render passes, it does not work for blit passes today. if the engine renders a backdrop filter, then the final command buffer submitted will be a blit pass that copies an offscreen onto the drawable. Therefore we need to add an async version of the blit submission, so that we have a hook to move the drawable acquisition onto a background thread for metal.
This hadn't been done until now because most blit cmd buffers have 1 or 2 cmds on them so the benefit of moving to a background thread is minimal.
Part of flutter/flutter#138490