DawnTest: Gather adapters on environment creation for filtering backends

This moves the creation of the Instance and Adapter discover to
environment creation. It allows programatically filtering test
parameterizations based on what is available on the system instead of
relying on what is enabled at compile time.

Because of an issue with the Vulkan validation layers, the instance and
adapters are created twice. Once in environment creation, and once on
environment set up. The Vulkan validation layers use static global
mutexes which are unsafe when Chromium's test launcher forks the
launcher process between environment creation and SetUp.

Bug: dawn:396
Change-Id: Id79f0d274331e4ba95f75b2ca4e896ad0f7a31a8
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/21762
Commit-Queue: Austin Eng <enga@chromium.org>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Reviewed-by: Stephen White <senorblanco@chromium.org>
4 files changed
tree: 44e5635479372bd16ab77e6e43321e682fd8f150
  1. .clang-format
  2. .gitattributes
  3. .gitignore
  4. .gn
  5. AUTHORS
  6. BUILD.gn
  7. CMakeLists.txt
  8. CONTRIBUTING.md
  9. DEPS
  10. LICENSE
  11. OWNERS
  12. PRESUBMIT.py
  13. README.chromium
  14. README.md
  15. build_overrides/
  16. codereview.settings
  17. dawn.json
  18. dawn_wire.json
  19. docs/
  20. examples/
  21. generator/
  22. infra/
  23. scripts/
  24. src/
  25. third_party/
  26. tools/
README.md

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 webgpu.h docs)

Status

(TODO)

License

Apache 2.0 Public License, please see LICENSE.

Disclaimer

This is not an officially supported Google product.