Implement copies b/w 3D and 2DArray textures on D3D12

Copies between 3D and 2DArray textures need to be done depth/array
slice by slice via CopyTextureRegion() API on D3D12 because this
API can copy one single subresource every time.

However, if both src and dst textures are 3D texture, we can copy
all depth slices in one shot, which is a fast path for this
copy scenario.

Bug: dawn:547

Change-Id: I950ed58319fb0f30dfc8a2de3e57e8a64406f7e4
Commit-Queue: Jiawei Shao <>
Reviewed-by: Corentin Wallez <>
Reviewed-by: Jiawei Shao <>
2 files changed
tree: 96fcad63516da3ad9ca638a510d89bb68efc98ba
  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.