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D3D keyed mutex cannot be acquired recursively and therefore external D3D textures cannot be concurrently read within Dawn (e.g. multiple imports of the same video frame) or across Dawn and GL (e.g. both WebGPU and WebGL importing a video frame). Within Dawn, we can scope keyed mutex acquire/release to command list submission so that Chromium can always guarantee that Dawn doesn't hold access to any resources after running Dawn wire commands. We also check that keyed mutexes aren't recursively acquired in Dawn by keeping track of the acquire count per resource. This solves the multiple acquire problem within Dawn and provides a path for concurrent read access across Dawn and GL once the GL decoders are changed so that they also don't hold access to resources after switching contexts. Bug: chromium:1241533 Change-Id: If88fd4a4f798b972836a134809e4fed8832ec89c Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/75644 Reviewed-by: Loko Kung <lokokung@google.com> Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org> Auto-Submit: Sunny Sachanandani <sunnyps@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org> Commit-Queue: Austin Eng <enga@chromium.org>
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.hversion that Dawn implements. - A C++ wrapper for the
webgpu.h.
- The
- 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:
- Dawn's bug tracker if you find issues with Dawn.
- Dawn's mailing list for other discussions related to Dawn.
- Dawn's source code
- Dawn's Matrix chatroom for live discussion around contributing or using Dawn.
- WebGPU's Matrix chatroom
Documentation table of content
Developer documentation:
- Dawn overview
- Building Dawn
- Contributing to Dawn
- Testing Dawn
- Debugging Dawn
- Dawn's infrastructure
- Dawn errors
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.