Impl 3DTexture copy splitter for empty first row issue on D3D12

If there is an empty row at the beginning of a copy region due to
alignment adjustment, this copy region split by 2D texture splitter
will be definitely incorrect for 3D textures because every depth
slice (except the first slice) will wrongly skip one row. We need
to recompute this copy region via modifying this copy region and
adding a couple more copy regions for the empty first row issue.

The idea of recomputation is:
  - modify this copy region and don't copy the last row in order to
    make its bufferSize.height not exceed rowsPerImage,
  - use one more copy region to handle the last row of each depth
    slice except the last depth slice,
  - use another copy region to handle the last row of the last depth
    slice.

Bug: dawn:547

Change-Id: Ib2f6019963ed29d62a9f13d7316b5f04801db8c9
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/52341
Commit-Queue: Yunchao He <yunchao.he@intel.com>
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
3 files changed
tree: f7a8bbe3c213668f779025d1306149f86521af6a
  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
  15. AUTHORS
  16. BUILD.gn
  17. CMakeLists.txt
  18. codereview.settings
  19. dawn.json
  20. dawn_wire.json
  21. DEPS
  22. DIR_METADATA
  23. LICENSE
  24. OWNERS
  25. PRESUBMIT.py
  26. README.chromium
  27. README.md
README.md

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)

Status

(TODO)

License

Apache 2.0 Public License, please see LICENSE.

Disclaimer

This is not an officially supported Google product.