Support T2T copies between formats that have only difference on srgb-ness

In previous T2T copy, Dawn requires textures have the same formats. But
Vulkan/Metal/D3D12 have ability to copy between "compatible" formats textures.

Metal has the most restrict rules without setting interpreter flags when creating
textures. It defines "compatible" texture formats to the formats that only have
difference on srgb-ness.

This CL follow Metal's rule and release the validations for T2T copies. It supports
T2T copy between "compatible" texture format textures.

Bug: dawn:1204
Change-Id: I50bf04ea15e8026530b3a5bdb5725f56aa192d85
Reviewed-by: Corentin Wallez <>
Commit-Queue: Shaobo Yan <>
9 files changed
tree: 06d5275493a79978afb74e98132f6fe865bc02b3
  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's logo: a sun rising behind a stylized mountain inspired by the WebGPU logo. The text Dawn is written below it.

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.