d3d12: Use fixed key for keyed mutex acquire and release

Chromium has switched to using a fixed key (0) for quite some time.
Using a fixed key enables future work needed for concurrent access of
external textures both inside Dawn (e.g. importing a video frame twice)
or across Dawn and GL. We want to try scoping the Acquire/Release calls
to command list submission, but with a non-fixed key concurrent access
for the same resource becomes ambiguous.

Bug: chromium:1241533
Change-Id: Ia8ff473b8c9c731c411a3fd59d69213f2d903e61
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/75642
Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Loko Kung <lokokung@google.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Commit-Queue: Austin Eng <enga@chromium.org>
9 files changed
tree: 9cf1fbb448ec7531708ad5e36ffbd5eecdf604c9
  1. .vscode/
  2. build_overrides/
  3. docs/
  4. examples/
  5. generator/
  6. infra/
  7. scripts/
  8. src/
  9. third_party/
  10. tools/
  11. .clang-format
  12. .gitattributes
  13. .gitignore
  14. .gn
  16. BUILD.gn
  17. CMakeLists.txt
  18. codereview.settings
  19. dawn.json
  20. dawn_wire.json
  21. DEPS
  24. OWNERS
  25. PRESUBMIT.py
  26. README.chromium
  27. README.md

Dawn's logo: a sun rising behind a stylized mountain inspired by the WebGPU logo. The text Dawn is written below it.

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.