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dawn / dawn / refs/heads/main
commit2473d745a87f81a0855a2b74eaa2a2da1b8a3044[log] [tgz]
authorJiawei Shao <jiawei.shao@intel.com>Fri Jan 16 19:24:39 2026 -0800
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Fri Jan 16 19:24:39 2026 -0800
treedf4da9cf1ef162328d34d1dc80946f0c79d5ae70
parent94447d0354afde558adb3a7c66eb96fcb08af4ba [diff]
[D3D12] Implement `chromium_experimental_subgroup_size_control`

This patch implements `chromium_experimental_subgroup_size_control`
on D3D12 backend. This feature requires at least Shader Model 6.6
for the HLSL attribute `[WaveSize]`.

As D3D12 runtime only accept the values between
`D3D12_FEATURE_DATA_D3D12_OPTIONS1::waveLaneCountMin` and
`D3D12_FEATURE_DATA_D3D12_OPTIONS1::waveLaneCountMax` as `[WaveSize]`,
while currently on D3D12 backend we don't always use these two values
as `AdapterInfo::subgroupMinSize` or `AdapterInfo::subgroupMaxSize`,
we introduce two new limitations (`minExplicitComputeSubgroupSize` and
`maxExplicitComputeSubgroupSize`) to provide valid values for
`[WaveSize]`.

Bug: 463721943
Test: dawn_end2end_tests
Change-Id: Ib86a6e2034957b5e1ab5091203d862d981247363
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/284855
Reviewed-by: James Price <jrprice@google.com>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: Shao, Jiawei <jiawei.shao@intel.com>
10 files changed
tree: df4da9cf1ef162328d34d1dc80946f0c79d5ae70
  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. test_spec_presubmit_support.py
  48. unsafe_buffers_paths.txt
  49. WATCHLISTS
  50. 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.