D3D12: Workaround buffer-texture copy with depth-stencil on some platforms

On the D3D12 platforms that don't support programmable sample positions,
the source box specifying a portion of the depth texture must all be 0, or
an error and a device lost will occur. This patch adds a workaround for this
issue by splitting the original buffer-texture copy into two copies:
1. copy from the source resource into a temporary buffer at offset 0
2. copy from the temporary buffer at offset 0 into the destination resource.

In the next patch we will fix the corresponding issue in Queue.WriteTexture.

Note that on newer version of D3D12 the restrictions about
have all been lifted out, so the workaround added in this patch will also be
disabled on the platforms that don't support programmable sample positions
but the restrictions about D3D12_TEXTURE_DATA_PLACEMENT_ALIGNMENT and
D3D12_TEXTURE_DATA_PITCH_ALIGNMENT are no longer available.

Bug: dawn:727
Test: dawn_end2end_test
Change-Id: I9f1d848a0eeac5bd52c9219af6992a2821307746
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/97182
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
Kokoro: Kokoro <noreply+kokoro@google.com>
10 files changed
tree: ab4d26445f7fafceddeea4f50c73e96815e16821
  1. .vscode/
  2. build_overrides/
  3. docs/
  4. generator/
  5. include/
  6. infra/
  7. scripts/
  8. src/
  9. test/
  10. third_party/
  11. tools/
  12. webgpu-cts/
  13. .clang-format
  14. .clang-tidy
  15. .gitattributes
  16. .gitignore
  17. .gn
  19. BUILD.gn
  20. CMakeLists.txt
  21. CMakeSettings.json
  23. codereview.settings
  25. CPPLINT.cfg
  26. dawn.json
  27. dawn_wire.json
  28. DEPS
  30. Doxyfile
  31. go.mod
  32. go.sum
  34. OWNERS
  35. PRESUBMIT.py
  36. README.chromium
  37. README.md
  38. tint_overrides_with_defaults.gni

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
  • Tint is a compiler for the WebGPU Shader Language (WGSL).

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.