Implement texture subresource on D3D12

When we use a texture for different purpose, we need to add proper
barrier(s) in order to make it ready. Previously, the barrier is
done per entire texture. So it is invalid to sample/read/copy from
one subresource (say a mip/array slice) and render/write/copy to
another subresource of the same texture at the same time.

With this patch, barrier is set per each texture subresource. So it is
valid to use a subresource as source and use another subresource of the
same texture as destination at the same time.

However, planar slices like depth/stencil planes are not handled
gracefully. This is a TODO task. Another task is to combine barriers
into one if they can be combined. I will do this optimization in
another patch in near future.

Bug: dawn:157

Change-Id: I783a76cb88fcdffb60c307ddfb89d50f1583201a
Reviewed-by: Corentin Wallez <>
Commit-Queue: Yunchao He <>
6 files changed
tree: 895fb6a23856a0121cf3e3f077913caa8dc1db6d
  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.