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Reland after a refactor of how the extension handling work in the Vulkan backend. The original author is David Turner <david.turner.dev@gmail.com>. This CL ensures that, on architectures with a varying subgroup size, compute shaders are always compiled with a fixed subgroup size to avoid consistency issues when one shader writes data in a subgroup-size dependent layout to GPU memory, to be read by another shader in a future dispatch. At the moment, only Intel ICDs are known to implement this [1], and the code uses a heuristics to chose the size of 16, which seems to be the sweet spot according to Intel engineers. + Update the PNextChainBuilder class to deal with the fact that VkComputePipelineCreateInfo::pNext is defined as a const void*, which created compiler errors in the previous implementation. [1] https://bugs.freedesktop.org/show_bug.cgi?id=108875 Bug: dawn:464 Change-Id: I035ee06084fcc964742f0bff4c54cff257c742ae Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/23202 Commit-Queue: Corentin Wallez <cwallez@chromium.org> Reviewed-by: Austin Eng <enga@chromium.org> Reviewed-by: Stephen White <senorblanco@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
- Dawm'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 webgpu.h docs)
Status
(TODO)
License
Apache 2.0 Public License, please see LICENSE.
Disclaimer
This is not an officially supported Google product.