microsoft / microsoft/DirectXShaderCompiler
Declare SV_VertexID as float only get validation error
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Description
Description
SV_VertexID should be a uint.
But declare it as float only get validation error.
Not compile error.
Steps to Reproduce
compile with -Tvs_6_0
float4 main(float V : SV_VertextID) : SV_Position {
return V;
}
https://godbolt.org/z/ahe1fjsEM
Actual Behavior
It should be a compile error instead of validation error.
Environment
- DXC version 1.7.2207
- Host Operating System Windows
Contributor guide
First steps
- Read the whole issue, then the project's contributing guide.
- Comment on the issue to say you are picking it up — it saves two people doing the same work.
- Fork the repository and make your change on a branch.
- Open a pull request that references the issue number.
Research direction
Start by reproducing the shader with DXC using -Tvs_6_0 and compare the compiler and validation stages, using the linked Compiler Explorer example. Trace where the SV_VertexID type is checked; done means declaring it as float produces a compile error rather than only a validation error.
Written by the indexing model from the issue text.
Assessment
- Tech stack
- cpp
- Domain
- compilers
- Issue type
- Bug
- Difficulty
- 4/5
- Estimated time
- 3-5 days
- Activity status
- Stale
- Clarity
- Mostly clear
- Newbie friendliness
- 42/100