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e3f3e9a80d
This reverts commit 4ae315b0d11882f341c22147672e1661bcb3b7d7.
Reason for revert: crbug.com/1059205
Bug: chromium:1059205
Original change's description:
> Vulkan: Report and enable subgroup size control device extension.
>
> Certain Vulkan ICDs (Intel ones notably) will compile SPIR-V
> shaders with an liberal, compiler-selected, subgroup size (i.e.
> either 8, 16 or 32). For more context, see [1].
>
> This can be a problem for compute, when one shader stores data
> in device memory using a subgroup-size dependent layout, to be
> consumed by a another shader. Problems arise when the compiler
> decides to compile both shaders with different subgroup sizes.
>
> To work-around this, the VK_EXT_subgroup_size_control device
> extension was introduced recently: it allows the device to
> report the min/max subgroup sizes it provides, and allows
> the Vulkan program to control the subgroup size precisely
> if it wants to.
>
> This patch adds support to the Vulkan backend to report and
> enable the extension if it is available. Note that:
>
> - The corresponding VkStructureType enum values and
> struct types are not rolled to the third-party Vulkan
> headers used by Dawn yet, so vulkan_platform.h has been
> modified to define them if necessary. This can be
> removed in the future when the Vulkan-Headers are
> updated in a different patch.
>
> - This modifies VulkanDeviceInfo::GatherDeviceInfo() to
> use VkGetPhysicalDevice{Properties2,Features2} if the
> VK_KHR_get_device_properties2 instance extension is
> available. Otherwise, the Vulkan 1.0 APIs
> VkGetPhysicalDevice{Properties,Features} are used instead
> (and it is assumed that no subgroup size control is
> possible).
>
> - This changes the definition of VulkanDeviceKnobs to
> make room for the required pNext-linked chains of
> extensions.
>
> - A helper class, PNextChainBuilder is also provided in
> UtilsVulkan.h to make it easy to build pNext-linked
> extension struct chains at runtime, as required when
> probing device propertires/features, or when
> creating a new VkDevice handle.
>
> Apart from that, there is no change in behaviour in this CL.
> I.e. a later CL might force a specific subgroup size for
> consistency, or introduce a new API to let Dawn clients
> select a fixed subgroup size.
>
> [1] https://bugs.freedesktop.org/show_bug.cgi?id=108875
>
> Change-Id: I524af6ff3479f25b0a8bb139a062fe632c826893
> Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16020
> Reviewed-by: Austin Eng <enga@chromium.org>
> Reviewed-by: Corentin Wallez <cwallez@chromium.org>
> Commit-Queue: Corentin Wallez <cwallez@chromium.org>
TBR=cwallez@google.com,cwallez@chromium.org,enga@chromium.org,enga@google.com,david.turner.dev@gmail.com
# Not skipping CQ checks because original CL landed > 1 day ago.
Change-Id: I893d771d7effdf83685dda3edac8a08f98d2f6e5
Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/16522
Reviewed-by: Corentin Wallez <cwallez@chromium.org>
Commit-Queue: 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
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.