Google Git
Sign in
dawn / dawn / 5881e735f935e9c0079c0a8ffbeae98a3d3de582
commit5881e735f935e9c0079c0a8ffbeae98a3d3de582[log] [tgz]
authorSunny Sachanandani <sunnyps@chromium.org>Wed Sep 07 19:48:45 2022 +0000
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Wed Sep 07 19:48:45 2022 +0000
treedebbc62f4657dd1e9f38c79726e430e149c02b0c
parent29aa613dcfb453270335f146031bbc084542923f [diff]
d3d12: External image import using multiple wait fences and signal fence

To support concurrent readers on multiple command queues/devices, Dawn
must support importing via wait multiple fences and also export a signal
fence. The previous implementation of using a single fence for waiting
and signaling doesn't work for concurrent reads across queues.

This CL adds support for specifying multiple wait fences for
ExternalImageDXGI via a BeginAccess method that's meant to replace
ProduceTexture. There's also an EndAccess method that returns a signal
fence for the client.

For performance reasons, we use the same fence as the signal fence that
the Device uses internally, and record its value on the texture after
ExecuteCommandLists. Therefore, the CL also makes the Device's internal
fence a shared fence so that we can export it to the client.

This CL also expands the ConcurrentExternalImageReadAccess test so that
it tests fence synchronization across multiple devices. A number of test
helpers also now take an optional device parameter so that we can use
pixel value expectations with secondary devices.

Bug: dawn:576
Change-Id: I6bc86808ede9b5aacf87667106cbd16731a12516
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/99746
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Austin Eng <enga@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
19 files changed
tree: debbc62f4657dd1e9f38c79726e430e149c02b0c
  1. .vscode/
  2. build_overrides/
  3. docs/
  4. generator/
  5. include/
  6. infra/
  7. scripts/
  8. src/
  9. test/
  10. third_party/
  11. tools/
  12. webgpu-cts/
  13. .clang-format
  14. .clang-tidy
  15. .gitattributes
  16. .gitignore
  17. .gn
  18. AUTHORS
  19. BUILD.gn
  20. CMakeLists.txt
  21. CMakeSettings.json
  22. CODE_OF_CONDUCT.md
  23. codereview.settings
  24. CONTRIBUTING.md
  25. CPPLINT.cfg
  26. dawn.json
  27. dawn_wire.json
  28. DEPS
  29. DIR_METADATA
  30. Doxyfile
  31. go.mod
  32. go.sum
  33. go_presubmit_support.py
  34. LICENSE
  35. OWNERS
  36. PRESUBMIT.py
  37. README.chromium
  38. README.md
  39. tint_overrides_with_defaults.gni
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, 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)

Status

(TODO)

License

Apache 2.0 Public License, please see LICENSE.

Disclaimer

This is not an officially supported Google product.