Output GLSL seems to be missing code

[tangent-vector]

Repro attached: test.spire.txt

When I run the Spire compiler on this file, I get an output .cse file. That file doesn't appear to contain any GLSL code to compute the rs_Position property mentioned in the source Spire, but it does contain a line of code to copy that component over to gl_Position.

It is possible that I'm not setting up my pipeline definition correctly, but I don't know the rules well enough to fix the issue myself.

[csyonghe]

The reason is rs_Position get dead-code-eliminated so it does not appear in the resulting code.

Currently it is required that you qualify rs_Position with out qualifier to mark it as used:

shader S_SurfaceShader
{
    public using SurfaceShader;

    out @CoarseVertex float4 rs_Position = P_proj;
    out @Fragment float4 om_Target = C_final;

}

[tangent-vector]

Adding out alone yields an error message telling me that a component marked with export needs to have an explicit world (I assume export got renamed to out at some point...). Adding an explicit world to each of these components does indeed work.

What I find a bit unfortunate is that I can't just put those decorations on the require in the pipeline definition. If I put out on the require for rs_Position, the compiler doesn't reject it, but it also doesn't emit code for rs_Position.

This is a case where I think that maybe the concept in Spark was a bit more clear: the pipeline would declare an abstract component, and the particular shader would override it, but qualifiers like out would automatically be inherited.

Anyway, the above message gives me the correct syntax for the current language, so I suppose I can close this.