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Buffer allocations in Dawn may be padded. This padding could be visible, depending on how the backend implements robust vertex buffer access. This commit updates buffer creation to clear all padding bytes immediately after creation. It is not counted as a lazy clear. And, add a test which reads off the end of a padded vertex buffer to check that the padding bytes are also initialized. Also: Update Metal buffers to always allocate enough space for Tint's vertex pulling, and pass the full allocated size to Tint. While writing the test in this commit, a bug was found where Tint assumes there is at least 4 bytes in the vertex pulling buffer. The WebGPU API currently allows zero-sized bindings, so Dawn needs to always allocate enough space for one element. Also: Update Vulkan vertex/index buffers to allocate at least one more byte than requested because vkCmdSetVertexBuffers and vkCmdSetIndexBuffer disallow the offset to be equal to the buffer size. We need at least one more byte to make zero-sized bindings as the end of the buffer valid. Lastly: Update helper so that a T2B copy of a single row that touches all bytes in a buffer updates the buffer state to be fully initialized. This is a small optimization that is necessary to write the test. Bug: dawn:837 Change-Id: I829f4764509c4ec784c5aeaaf40b6dcbd4be6866 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/62161 Commit-Queue: Austin Eng <enga@chromium.org> Reviewed-by: Kai Ninomiya <kainino@chromium.org> Reviewed-by: Corentin Wallez <cwallez@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:
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.