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dawn / dawn / e4f947637a3bb45b4d9be9b1cf7cf51461dff800
commite4f947637a3bb45b4d9be9b1cf7cf51461dff800[log] [tgz]
authorJiawei Shao <jiawei.shao@intel.com>Mon Feb 20 03:10:32 2023 +0000
committerDawn LUCI CQ <dawn-scoped@luci-project-accounts.iam.gserviceaccount.com>Mon Feb 20 03:10:32 2023 +0000
treebf3ac07cce6ea86e9a549d58c5dfdbe24da7a780
parentb5af23d5880d0f2f5ecb3517bc8a92b685c778c4 [diff]
D3D12: Replace dst-alpha with one for formats without alpha

This patch replaces D3D12_BLEND_DEST_ALPHA with D3D12_BLEND_ONE
when the color target formats have no alpha-channel.

Using D3D12_BLEND_ONE is an optimization over
D3D12_BLEND_DEST_ALPHA as it means the GPU hardware doesn't
need to get destination pixel at all. As D3D SPED requires the
default value for missing components in an element format is
"0" for any component except A, which gets "1", using
D3D12_BLEND_DEST_ALPHA takes same effect with
D3D12_BLEND_ONE when the color target formats have no alpha
channel.

In addition, replacing D3D12_BLEND_DEST_ALPHA with
D3D12_BLEND_ONE also serves as a workaround against an Intel
driver issue about alpha blending.

Bug: dawn:1579
Change-Id: If79e4c8007b68dd35e142ba9cf8a4921e611890a
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/120120
Kokoro: Kokoro <noreply+kokoro@google.com>
Commit-Queue: Jiawei Shao <jiawei.shao@intel.com>
Reviewed-by: Austin Eng <enga@chromium.org>
2 files changed
tree: bf3ac07cce6ea86e9a549d58c5dfdbe24da7a780
  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
  18. AUTHORS
  19. BUILD.gn
  20. CMakeLists.txt
  21. CMakeSettings.json
  22. CODE_OF_CONDUCT.md
  23. codereview.settings
  24. CONTRIBUTING.md
  25. CPPLINT.cfg
  26. dawn.json
  27. dawn_wire.json
  28. DEPS
  29. DIR_METADATA
  30. Doxyfile
  31. go.mod
  32. go.sum
  33. go_presubmit_support.py
  34. LICENSE
  35. OWNERS
  36. PRESUBMIT.py
  37. README.chromium
  38. README.md
  39. tint_overrides_with_defaults.gni
README.md

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, Metal, Vulkan and OpenGL. See per API support for more details.
  • 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) that can be used in standalone to convert shaders from and to WGSL.

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.