Clean up CopyTests

This patch does several clean-ups in CopyTests as a preparation of
supporting buffer-to-texture and texture-to-buffer copies with multiple
texture array layers.
1. Remove the zero-initialization of textures in CopyTests_B2T
2. Use a big buffer that contains the pixel data in all the texture
   array layers instead of several small ones that only contains one
   texture array layer.
3. Make CopyTests_T2T::DoTest() also use CopyTests::TextureSpec as its
   input parameter.
4. Add tests for the copies with multiple texture array layers. In this
   patch we just copy the data once per texture array layer, while in
   the next patch we will be able to copy the data for all the related
   texture array layers in one copy command.
5. Move some helper functions for copy tests to WGPUHelpers.cpp


Change-Id: Ia0150a6c55fffce3e24dda2cd45fd920b0873dc9
Commit-Queue: Corentin Wallez <>
Reviewed-by: Austin Eng <>
3 files changed
tree: b7d6a4c1b228f71cbad276a13e95af55765a53d6
  1. .clang-format
  2. .gitattributes
  3. .gitignore
  4. .gn
  7. CMakeLists.txt
  9. DEPS
  11. OWNERS
  13. README.chromium
  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/

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)




Apache 2.0 Public License, please see LICENSE.


This is not an officially supported Google product.