mirror of
https://github.com/encounter/dawn-cmake.git
synced 2025-06-03 13:11:34 +00:00
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.h
version 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.
Description
CMake-only fork of https://dawn.googlesource.com/dawn with cleaned, vendored dependencies
Languages
C++
59.9%
HLSL
18.2%
GLSL
17.3%
Go
2.1%
Objective-C++
0.8%
Other
1.6%