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dawn/dawn/99622c4f7ef017a2f527e1e1d4afddcb93d04b35
commit
99622c4f7ef017a2f527e1e1d4afddcb93d04b35
[log]
author
Natalie Chouinard <chouinard@google.com>
Mon Jun 01 11:46:17 2026 -0700
committer
dawn-scoped@luci-project-accounts.iam.gserviceaccount.com <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>
Mon Jun 01 11:46:17 2026 -0700
tree
fb880bc11866c0bf036976b9468988524c63fb32
parent
78f92fc2d65532f577fd57d77032e21979036fd3 [diff]
[tint] Collapse nested subgroupMin/Max ops on AMD

On some AMD GPUs on Windows, nested subgroupMin/Max operations can
trigger a crash.

This change collapses multiple nested subgroupMin/Max calls to a single
call, the innermost subgroupMin/Max operation. This is safe because the
result of a subgroupMin/Max call is necessarily subgroup uniform.

This bug exists in both the Vulkan and D3D12 drivers on Windows, and on
Mac. On Windows it is fixed in later versions, but because it's a
harmless optimizing transform it's applied broadly to all versions on
affected backend platforms.

Bug: 508265321
Change-Id: I658d0ddece1887d9211ad9ea2eb07a96ada0e3ce
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/311521
Commit-Queue: Natalie Chouinard <chouinard@google.com>
Reviewed-by: dan sinclair <dsinclair@chromium.org>
25 files changed
tree: fb880bc11866c0bf036976b9468988524c63fb32
  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.