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dawn/dawn/HEAD
commit
9533d3296a2a39726f42409d97c726b970ad5211
[log]
author
Natalie Chouinard <chouinard@google.com>
Fri Jun 12 17:59:00 2026 -0700
committer
dawn-scoped@luci-project-accounts.iam.gserviceaccount.com <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>
Fri Jun 12 17:59:00 2026 -0700
tree
03e807fdf102ef28fa050aad8fe4b7ef34cc6346
parent
64a69fe823987ea10d95ab2823901258ab2825a3 [diff]
[tint][msl] Workaround bug in Metal insert_bits

When MSL's insert_bits builtin is called with an offset of 32 and a
count of 0, it can trigger a GPU hang.

This works around the issue by clamping to 31, which is the greatest
offset in insert_bits that is not a no-op (inserts only 1 bit at most).
If inserting 0 bits, it is a no-op anyways so the clamp has no
functional affect besides preventing the hang.

Since this does not adhere to the MSL spec a feedback has also been
filed to Apple: FB23103184.

Corresponding CTS that passes only after this change:
https://github.com/gpuweb/cts/pull/4664

Bug: 506180954
Change-Id: I6954f22f56340998cb21bcef8f4a2d618298b89a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/316515
Commit-Queue: Natalie Chouinard <chouinard@google.com>
Reviewed-by: James Price <jrprice@google.com>
10 files changed
tree: 03e807fdf102ef28fa050aad8fe4b7ef34cc6346
  1. .github/
  2. .vscode/
  3. agents/
  4. build_overrides/
  5. docs/
  6. generator/
  7. include/
  8. infra/
  9. scripts/
  10. src/
  11. test/
  12. third_party/
  13. tools/
  14. webgpu-cts/
  15. build
  16. buildtools
  17. testing
  18. .bazelrc
  19. .bazelversion
  20. .clang-format
  21. .clang-format-ignore
  22. .clang-tidy
  23. .git-blame-ignore-revs
  24. .gitattributes
  25. .gitignore
  26. .gitmodules
  27. .gn
  28. .style.yapf
  29. .vpython3
  30. AUTHORS
  31. BUILD.bazel
  32. BUILD.gn
  33. CMakeLists.txt
  34. CMakeSettings.json
  35. CODE_OF_CONDUCT.md
  36. codereview.settings
  37. CONTRIBUTING.md
  38. CPPLINT.cfg
  39. DEPS
  40. DIR_METADATA
  41. go.mod
  42. go.sum
  43. go_presubmit_support.py
  44. LICENSE
  45. MODULE.bazel
  46. MODULE.bazel.lock
  47. OWNERS
  48. PRESUBMIT.py
  49. PRESUBMIT_test.py
  50. README.chromium
  51. README.md
  52. unsafe_buffers_paths.txt
  53. WATCHLISTS
  54. WORKSPACE.bazel
README.md

Build Status Matrix Space

Dawn, a WebGPU implementation

Dawn is an open-source and cross-platform implementation of the WebGPU standard. More precisely it implements webgpu.h that is a one-to-one mapping with the WebGPU IDL. Dawn is meant to be integrated as part of a larger system and is the underlying implementation of WebGPU in Chromium.

Dawn provides several WebGPU building blocks:

  • WebGPU C/C++ headers that applications and other building blocks use.
    • The webgpu.h version that Dawn implements.
    • A C++ wrapper for the webgpu.h.
  • A “native” implementation of WebGPU using platforms' GPU APIs: D3D12, Metal, Vulkan and OpenGL. See per API support for more details.
  • A client-server implementation of WebGPU for applications that are in a sandbox without access to native drivers
  • Tint is a compiler for the WebGPU Shader Language (WGSL) that can be used in standalone to convert shaders from and to WGSL.

Helpful links:

Documentation table of content

Developer documentation:

User documentation: (TODO, figure out what overlaps with the webgpu.h docs)

License

BSD 3-Clause License, please see LICENSE.

Disclaimer

This is not an officially supported Google product.