[WebGPU, Dawn]: Upgrade Dawn and new features for WebGPU

[MikhailGorobets]

…on for WebGPU

[Copilot]

Pull request overview

This PR upgrades the Dawn WebGPU implementation to a newer version (commit hash 042e54a9f93e6d2fed503aabe68003dff1705805) and adds support for WebGPU texture formats tier 1 extension. The upgrade includes significant API changes in the WebGPU/Dawn interface, transitioning to a new callback system and updating type names across the codebase.

Key Changes

• Dawn version upgraded with simplified dependency management through git submodules instead of separate abseil-cpp handling
• WebGPU API updated to use new callback structures with pUserData1/pUserData2 parameters and callback info structs
• Type renames: WGPUImageCopyBuffer/WGPUImageCopyTexture → WGPUTexelCopyBufferInfo/WGPUTexelCopyTextureInfo, WGPUSupportedLimits → WGPULimits
• Texture tier 1 support added, replacing separate Unorm16/Snorm16 features with unified WGPUFeatureName_TextureFormatsTier1

Reviewed changes

Copilot reviewed 19 out of 19 changed files in this pull request and generated 4 comments.

Show a summary per file

File	Description
ThirdParty/dawn/CMakeLists.txt	Updates Dawn version, adds submodule management, upgrades to C++20, and reorganizes build configuration
ThirdParty/abseil-cpp/CMakeLists.txt	Removes standalone abseil-cpp as it's now managed as Dawn submodule
ThirdParty/CMakeLists.txt	Comments out abseil-cpp and gtest Emscripten configuration
Graphics/ShaderTools/src/WGSLUtils.cpp	Updates Tint shader compiler API calls for new IR-based workflow
Graphics/ShaderTools/src/WGSLShaderResources.cpp	Adds texture format mappings for tier 1 formats
Graphics/ShaderTools/CMakeLists.txt	Adds C++20 compilation requirement for shader tools
Graphics/GraphicsTools/CMakeLists.txt	Adds dawn_headers dependency
Graphics/GraphicsEngineWebGPU/src/WebGPUTypeConversions.cpp	Updates texture format range size
Graphics/GraphicsEngineWebGPU/src/WebGPUResourceBase.cpp	Updates async map callback signature
Graphics/GraphicsEngineWebGPU/src/TextureWebGPUImpl.cpp	Renames image copy structs to texel copy types
Graphics/GraphicsEngineWebGPU/src/SwapChainWebGPUImpl.cpp	Updates surface status handling and string view usage
Graphics/GraphicsEngineWebGPU/src/RenderDeviceWebGPUImpl.cpp	Simplifies limits handling and replaces Unorm16/Snorm16 features with TextureFormatsTier1
Graphics/GraphicsEngineWebGPU/src/PipelineStateWebGPUImpl.cpp	Unifies async pipeline creation callbacks and removes platform-specific code
Graphics/GraphicsEngineWebGPU/src/EngineFactoryWebGPU.cpp	Updates adapter/device creation with new callback info structs and limits API
Graphics/GraphicsEngineWebGPU/src/DeviceContextWebGPUImpl.cpp	Renames image copy types throughout and updates work done callback
Graphics/GraphicsEngineWebGPU/include/pch.h	Removes Emscripten compatibility layer now that web and native APIs are unified
Graphics/GraphicsEngineWebGPU/include/WebGPUStubs.hpp	Removes stub definitions for texture formats now natively supported
Graphics/GraphicsEngineWebGPU/CMakeLists.txt	Updates Emscripten build to use emdawnwebgpu port
BuildTools/CMake/BuildUtils.cmake	Enhances FetchContent_DeclareShallowGit macro with submodule support

Comments suppressed due to low confidence (1)

Graphics/GraphicsEngineWebGPU/src/EngineFactoryWebGPU.cpp:260

• These legacy feature checks for Unorm16TextureFormats and Snorm16TextureFormats should be updated to use WGPUFeatureName_TextureFormatsTier1 instead, which is the unified feature that supersedes them in the new Dawn version. This is inconsistent with the RenderDeviceWebGPUImpl.cpp changes that already use TextureFormatsTier1.

        if (wgpuAdapterHasFeature(wgpuAdapter, WGPUFeatureName_Unorm16TextureFormats))
            wgpuFeatures.push_back(WGPUFeatureName_Unorm16TextureFormats);

        if (wgpuAdapterHasFeature(wgpuAdapter, WGPUFeatureName_Snorm16TextureFormats))
            wgpuFeatures.push_back(WGPUFeatureName_Snorm16TextureFormats);

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[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

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Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 1 comment.

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[Copilot]

Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 2 comments.

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Pull request overview

Copilot reviewed 21 out of 21 changed files in this pull request and generated 4 comments.

Comments suppressed due to low confidence (1)

Graphics/GraphicsEngineWebGPU/src/EngineFactoryWebGPU.cpp:260

• The PR title mentions adding 'texture-formats-tier1' feature support, but this feature is not being requested from the adapter in CreateDeviceForAdapter. The old separate Unorm16TextureFormats and Snorm16TextureFormats features are still being requested, which according to the WebGPU spec have been superseded by TextureFormatsTier1. Consider adding a check for WGPUFeatureName_TextureFormatsTier1 and requesting it from the adapter if available.

        if (wgpuAdapterHasFeature(wgpuAdapter, WGPUFeatureName_Unorm16TextureFormats))
            wgpuFeatures.push_back(WGPUFeatureName_Unorm16TextureFormats);

        if (wgpuAdapterHasFeature(wgpuAdapter, WGPUFeatureName_Snorm16TextureFormats))
            wgpuFeatures.push_back(WGPUFeatureName_Snorm16TextureFormats);

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