Add validations on the texture-to-texture copies within same texture

This patch adds validations on the texture-to-texture copies within the
same texture to align with the latest change in WebGPU SPEC: When the
source and destination textures are the same one, the source and the
destination subresources involved in the copy must not overlap.

Note that we don't enable the newly added end2end tests on D3D12
because when doing texture-to-texture copy within the same texture, we
need to set the source subresources into TRANSFER_SRC state and set the
destination subresources into TRANSFER_DEST state, while right now we
don't support subresource tracking on D3D12.


Change-Id: I6408640d01beaf6ab9ef30b001e9c87cfecbdd65
Reviewed-by: Corentin Wallez <>
Commit-Queue: Jiawei Shao <>
6 files changed
tree: 410de2335a861c6e2ecae09052edf9071a9aff81
  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.