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dawn / dawn / 498fbf7cc39ebf9b8fe85ea6f3ad59f3eae4be4e
commit498fbf7cc39ebf9b8fe85ea6f3ad59f3eae4be4e[log] [tgz]
authorBrandon Jones <bajones@chromium.org>Mon Nov 10 19:29:11 2025 -0800
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Mon Nov 10 19:29:11 2025 -0800
treec0dd7d3a1a1d2eebcd3309c2f71be7c9c1e6bd27
parent9a6e465a38f1b60d7e28f6b5353c43d35b570183 [diff]
Optimize Dawn Wire WriteBuffer

Reduces the number of memcpys that are done when uploading buffer data
via WriteBuffer using the wire client. Does so by directly managing the
allocation of shared memory and writing to that rather than copying the
data to the wire command buffer first, which may involve chunking and
additional copies.

In tests so far this performs up to 2X better than the previous
WriteBuffer implementation, depending on data size. (Larger uploads
typically see a bigger improvement.)

Derived from Loko's prototype:
https://dawn-review.googlesource.com/c/dawn/+/269134
https://dawn-review.googlesource.com/c/dawn/+/269814

Alternative to my previous effort to move the WriteBuffer implementation
client-side: https://dawn-review.googlesource.com/c/dawn/+/270895

Bug: 441900745
Change-Id: I1d7aa1b7f64e2ac6582512d64a4b981f2e208cd6
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/271535
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Commit-Queue: Brandon Jones <bajones@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
4 files changed
tree: c0dd7d3a1a1d2eebcd3309c2f71be7c9c1e6bd27
  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.