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06844a5e24
I added the forcing of the "loop" attribute to all loops to address FXC failing on uniformity errors related to gradients in loops. Since then, Tint now implements UA and it recently became an error, so we no longer need this hack. As a result, FXC is now better able to cope with loops that it determines executes 0 times. Most e2e tests are affected because so many use loops, but 27 tests that were previously failing are now passing with this change: tint/bug/tint/1538.wgsl.expected.fxc.hlsl tint/bug/tint/1604.wgsl.expected.fxc.hlsl tint/bug/tint/1605.wgsl.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserCFGTest_ClassifyCFGEdges_LoopBreak_FromLoopHeader_SingleBlockLoop_TrueBranch.spvasm.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserCFGTest_ComputeBlockOrder_Loop_HeaderHasBreakUnless.spvasm.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserCFGTest_EmitBody_IfSelection_TrueBranch_LoopBreak.spvasm.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserCFGTest_FindIfSelectionInternalHeaders_TrueBranch_LoopBreak_Ok.spvasm.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserFunctionVarTest_EmitStatement_Phi_MultiBlockLoopIndex.spvasm.expected.fxc.hlsl tint/unittest/reader/spirv/SpvParserFunctionVarTest_EmitStatement_Phi_SingleBlockLoopIndex.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/cov-dead-code-unreachable-merge/0-opt.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/cov-dead-code-unreachable-merge/0-opt.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/similar-nested-ifs/0-opt.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/similar-nested-ifs/0-opt.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/spv-load-from-frag-color/1.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/spv-load-from-frag-color/1.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-false-if-discard-loop/0.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-false-if-discard-loop/0.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-fragcoord-less-than-zero/0.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-fragcoord-less-than-zero/0.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-fragcoord-less-than-zero/1.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-fragcoord-less-than-zero/1.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-with-loop-read-write-global/0-opt.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-with-loop-read-write-global/0-opt.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-with-loop-read-write-global/1.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/stable-binarysearch-tree-with-loop-read-write-global/1.wgsl.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/write-red-after-search/0-opt.spvasm.expected.fxc.hlsl tint/vk-gl-cts/graphicsfuzz/write-red-after-search/0-opt.wgsl.expected.fxc.hlsl Bug: tint:1522 Bug: tint:1538 Bug: tint:1604 Bug: tint:1605 Change-Id: I530b846b6b8df122ab351ff7b85d3e1c9ac11526 Reviewed-on: https://dawn-review.googlesource.com/c/dawn/+/104121 Reviewed-by: Ben Clayton <bclayton@google.com> Commit-Queue: Antonio Maiorano <amaiorano@google.com> Kokoro: Kokoro <noreply+kokoro@google.com>
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, Metal, Vulkan and OpenGL. See per API support for more details.
- A client-server implementation of WebGPU for applications that are in a sandbox without access to native drivers
- Tint is a compiler for the WebGPU Shader Language (WGSL) that can be used in standalone to convert shaders from and to WGSL.
Helpful links:
- Dawn bug tracker if you find issues with Dawn.
- Tint bug tracker if you find issues with Tint.
- Dawn's mailing list for other discussions related to Dawn.
- Dawn's source code
- Dawn's Matrix chatroom for live discussion around contributing or using Dawn.
- WebGPU's Matrix chatroom
- Tint mirror for standalone usage.
Documentation table of content
Developer documentation:
- Dawn overview
- Building
- Contributing
- Code of Conduct
- Testing Dawn
- Debugging Dawn
- Dawn's infrastructure
- Dawn errors
- Tint experimental extensions
User documentation: (TODO, figure out what overlaps with the webgpu.h docs)
Status
(TODO)
License
Apache 2.0 Public License, please see LICENSE.
Disclaimer
This is not an officially supported Google product.