|author||Sunny Sachanandani <email@example.com>||Wed Jan 12 00:28:37 2022 +0000|
|committer||Dawn LUCI CQ <firstname.lastname@example.org>||Wed Jan 12 00:28:37 2022 +0000|
d3d12: Acquire/release keyed mutex around ExecuteCommandLists 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 <email@example.com> Commit-Queue: Sunny Sachanandani <firstname.lastname@example.org> Auto-Submit: Sunny Sachanandani <email@example.com> Reviewed-by: Austin Eng <firstname.lastname@example.org> Commit-Queue: Austin Eng <email@example.com>
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.hversion that Dawn implements.
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.