HLSL Vertex and Fragment Semantics Order Seems to Need to Match

[cwfitzgerald]

From what I can tell, HLSL semantics needs to have the same order in the output struct as the input struct.

When compiling the following spirv with wgpu (with gfx-rs/naga#1179), I get the following error

spirv.zip

D3D12 ERROR: ID3D12Device::CreateGraphicsPipelineState: Vertex Shader - Pixel Shader linkage error: Signatures between stages are incompatible. Semantic 'LOC' is defined for mismatched hardware registers between the output stage and input stage. [ STATE_CREATION ERROR gfx-rs/naga#660: CREATEGRAPHICSPIPELINESTATE_SHADER_LINKAGE_REGISTERINDEX]

From googling the error it appears that they have to be in the same order, but it's hard to prove that it is truly the solution.