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dawn / dawn / f5abb823f98d0ab55b31b63453d46188b7f9e5a3
commitf5abb823f98d0ab55b31b63453d46188b7f9e5a3[log] [tgz]
authorAntonio Maiorano <amaiorano@google.com>Wed Feb 28 01:01:02 2024 +0000
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Wed Feb 28 01:01:02 2024 +0000
tree532befe9c01b65258842be398f26789567478e4d
parent458f703ec39a873dc46ba3041f71eb387e6a161d [diff]
tint: work around zero-init bug on some GPUs for workgroup size(1)

This was seen specifically on Windows with an AMD GPU, when using DXC to
compile compute shaders with workgroup size of 1. Flaky, but
reproducible when running CTS test:
webgpu:shader,execution,zero_init:compute,zero_init:addressSpace="workgroup";workgroupSize=[1,1,1];*

We are generating valid code in Tint, but this workaround makes it so
that DXC opts to emit the zero-init instructions rather than tagging the
groupshared variable as 'zeroinitializer'. This seems to make the buggy
driver happy.

Also see: https://github.com/microsoft/DirectXShaderCompiler/issues/6352

Bug: tint:2143
Change-Id: If84b992c4961bafeb1a8ff328626d3f6cf1fb98d
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/176140
Commit-Queue: Antonio Maiorano <amaiorano@google.com>
Reviewed-by: Ben Clayton <bclayton@google.com>
Kokoro: Kokoro <noreply+kokoro@google.com>
774 files changed
tree: 532befe9c01b65258842be398f26789567478e4d
  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-tidy
  20. .gitattributes
  21. .gitignore
  22. .gitmodules
  23. .gn
  24. AUTHORS
  25. BUILD.bazel
  26. BUILD.gn
  27. CMakeLists.txt
  28. CMakeSettings.json
  29. CODE_OF_CONDUCT.md
  30. codereview.settings
  31. CONTRIBUTING.md
  32. CPPLINT.cfg
  33. DEPS
  34. DIR_METADATA
  35. go.mod
  36. go.sum
  37. go_presubmit_support.py
  38. LICENSE
  39. OWNERS
  40. PRESUBMIT.py
  41. README.chromium
  42. README.md
  43. 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.