Refactor APICreateComputePipelineAsync to support both sync and async path

This patch refactors the implementation of APICreateComputePipelineAsync
as a preparation of the async path of the creation of compute pipeline.

Now the code path of APICreateComputePipelineAsync() includes the following
3 parts:
- When an error occurs in the front-end validations, the callback will be
  called at once in the main thread.
- When we can find a proper compute pipeline object in the cache, the
  callback will be called at once in the main thread.
- When we cannot find the proper comptue pipeline object in the cache, the
  newly-created pipeline object, the callback and userdata will be saved
  into the CreatePipelineAsyncTracker, and the callback will be called in
  device.Tick(). All the logic mentioned in this section has been put into
  one function CreateComputePipelineAsyncImpl(), which will be overrided
  by its asynchronous version on all the backends that support creating
  pipeline objects asynchronously.

Note that APICreateRenderPipelineAsync is not changed in this patch because
it is now under refactoring to match the current updates in WebGPU SPEC.


Change-Id: Ie1cf2f9fc8e18c3e6ad723c6a0cefce29a0eb69c
Reviewed-by: Corentin Wallez <>
Commit-Queue: Jiawei Shao <>
5 files changed
tree: b09add12fdafa07d9c73e7b892535e5078dff967
  1. .clang-format
  2. .gitattributes
  3. .gitignore
  4. .gn
  5. .vscode/
  8. CMakeLists.txt
  10. DEPS
  13. OWNERS
  15. README.chromium
  17. build_overrides/
  18. codereview.settings
  19. dawn.json
  20. dawn_wire.json
  21. docs/
  22. examples/
  23. generator/
  24. infra/
  25. scripts/
  26. src/
  27. third_party/
  28. tools/

Dawn, a WebGPU implementation

Dawn is an open-source and cross-platform implementation of the work-in-progress 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 on Windows 10
    • Metal on macOS and iOS
    • Vulkan on Windows, Linux, ChromeOS, Android and Fuchsia
    • OpenGL as best effort where available
  • A client-server implementation of WebGPU for applications that are in a sandbox without access to native drivers

Helpful links:

Documentation table of content

Developer documentation:

User documentation: (TODO, figure out what overlaps with the webgpu.h docs)




Apache 2.0 Public License, please see LICENSE.


This is not an officially supported Google product.