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Bug 1575008 - WebGPU implementation basis r=baku,bzbarsky
This change vendors `wgpu` library in-tree and hooks up the initialization bits. It implements adapter and device initialization and adds a simple test. Complementary ecosystem tracker - gfx-rs/wgpu#374 Current status: - [x] Architecture - [x] figure out the IPC story - [ ] move wgpu crates into a dedicated folder (postponed as https://bugzilla.mozilla.org/show_bug.cgi?id=1594182) - [x] Linux - [x] avoid depending on spirv_cross - [x] macOS - [x] due to cross-compiling shaders - [x] need the dependency update - [x] stop using gcc - [x] unexpected SSL header collision - https://phabricator.services.mozilla.com/D51148 - [x] undefined Metal symbols - [x] missing webrtc headers for IPDL magic - https://phabricator.services.mozilla.com/D51558 - [x] spirv-cross linking failure in ASAN - https://phabricator.services.mozilla.com/D52688 - [x] Windows - [x] due to "ipc-channel" not supporting Windows yet - [x] due to some exceptional stuff - [x] undefined symbol: `D3D12CreateDevice` - [x] d3d12.dll is not found, dxgi1_4 doesn't present - [x] d3d11.dll and dxgi.dll need to be explicitly loaded on win32 mingw - [x] libbacktrace fails to link on win32 mingw - [x] cc mislinking C++ standard library - [x] Android - [x] spirv-cross fails to build due to exceptions Update-1: We decided to go with IPDL mechanism instead of Rust based ipc-channel (or any alternatives), which unblocks Windows build. Update-2: It appears that WebGPUThreading isn't needed any more as the child thread (and its event loop) is now managed by IPDL infrastructure. This PR removes it 🎉 . Update-3: InstanceProvider is also removed. Update-4: All set, the try is green, waiting for dependent changes to go in. Differential Revision: https://phabricator.services.mozilla.com/D49458 UltraBlame original commit: 4d16c3d62cfc0503075206bccfbd3b32ad396e64
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