Add Adapter::SupportsExternalImages

This commit adds a getter so that Chromium can check whether an
Adapter would support external images. External images are
necessary to implement the WebGPU swapchain and interop with the
rest of the web platform. We should not expose adapters that
cannot interop with the canvas and other web platform primitives
until WebGPU gains options to request more "limited" adapters.

Bug: dawn:1056
Change-Id: Iff83ac26b0e92dccdd4e29c0d854d9276a4a37bc
Reviewed-by: Kai Ninomiya <>
Reviewed-by: Brian Ho <>
Commit-Queue: Austin Eng <>
20 files changed
tree: 402a8f0410d4f8a2259e3c8a50467d78784e4966
  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
  17. CMakeLists.txt
  18. codereview.settings
  19. dawn.json
  20. dawn_wire.json
  21. DEPS
  24. OWNERS
  26. README.chromium

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.