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dawn / dawn / d7d27a68de5f547939d4faf965b0ce279e752b64
commitd7d27a68de5f547939d4faf965b0ce279e752b64[log] [tgz]
authorJames Price <jrprice@google.com>Fri Oct 03 13:59:21 2025 -0700
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Fri Oct 03 13:59:21 2025 -0700
treedc60b4660615c769247d947b1e68e40d71b5f897
parent43d8fb0293947a3fec5c9ba187f16a9176597d31 [diff]
[metal] Expose the exact subgroup size for Apple GPUs

Apple GPUs have a fixed subgroup size of 32. Exposing the actual
subgroup size makes it easier to write high performing shaders,
particularly when using the subgroup matrix extension which requires
the workgroup size to be a multiple of the maximum subgroup size.

This does not increase the ability to fingerprint these devices, since
the presence of the subgroup matrix extension on Metal is already an
indication that the device is an Apple GPU.

Fixed: 416313648
Change-Id: Iaa701d290cae2531a77b14c83b5b7e6d375f6de0
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/264274
Reviewed-by: Peter McNeeley <petermcneeley@google.com>
Commit-Queue: James Price <jrprice@google.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
1 file changed
tree: dc60b4660615c769247d947b1e68e40d71b5f897
  1. .github/
  2. .vscode/
  3. build_overrides/
  4. docs/
  5. generator/
  6. include/
  7. infra/
  8. scripts/
  9. src/
  10. test/
  11. third_party/
  12. tools/
  13. webgpu-cts/
  14. build
  15. buildtools
  16. testing
  17. .bazelrc
  18. .clang-format
  19. .clang-format-ignore
  20. .clang-tidy
  21. .git-blame-ignore-revs
  22. .gitattributes
  23. .gitignore
  24. .gitmodules
  25. .gn
  26. .style.yapf
  27. .vpython3
  28. AUTHORS
  29. BUILD.bazel
  30. BUILD.gn
  31. CMakeLists.txt
  32. CMakeSettings.json
  33. CODE_OF_CONDUCT.md
  34. codereview.settings
  35. CONTRIBUTING.md
  36. CPPLINT.cfg
  37. DEPS
  38. DIR_METADATA
  39. go.mod
  40. go.sum
  41. go_presubmit_support.py
  42. LICENSE
  43. OWNERS
  44. PRESUBMIT.py
  45. README.chromium
  46. README.md
  47. unsafe_buffers_paths.txt
  48. WATCHLISTS
  49. 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.