Unity shader code reflection/introspection?

I'm trying to write a tessellation and geometry shader for HDRP-- The biggest challenge is that each pass of the shader needs different variables interpolated.

I ended up writing something like this, which works...

Code (CSharp):

1. [domain("tri")]
2. AttributesMesh domain(TessellationFactors factors, OutputPatch<AttributesMesh, 3> patch, float3 barycentricCoordinates : SV_DomainLocation) {
3.     AttributesMesh v = (AttributesMesh)0;
4.  
5.     #define TESS_INTERPOLATE(fieldName) v.fieldName = \
6.         patch[0].fieldName * barycentricCoordinates.x + \
7.         patch[1].fieldName * barycentricCoordinates.y + \
8.         patch[2].fieldName * barycentricCoordinates.z;
9.  
10.     #if defined(GBUFFER_PASS)
11.         TESS_INTERPOLATE(positionOS)
12.         TESS_INTERPOLATE(normalOS)
13.         TESS_INTERPOLATE(tangentOS)
14.         TESS_INTERPOLATE(uv1)
15.         TESS_INTERPOLATE(uv2)
16.         TESS_INTERPOLATE(ase_texcoord)
17.         TESS_INTERPOLATE(ase_color)
18.     #elif defined(DEPTH_ONLY_PASS)
19.         TESS_INTERPOLATE(positionOS)
20.         TESS_INTERPOLATE(normalOS)
21.         TESS_INTERPOLATE(tangentOS)
22.         TESS_INTERPOLATE(ase_texcoord)
23.         TESS_INTERPOLATE(ase_color)
24.     #elif defined(FORWARD_PASS)
25.         TESS_INTERPOLATE(positionOS)
26.         TESS_INTERPOLATE(normalOS)
27.         TESS_INTERPOLATE(tangentOS)
28.         TESS_INTERPOLATE(uv1)
29.         TESS_INTERPOLATE(uv2)
30.         TESS_INTERPOLATE(ase_texcoord)
31.         TESS_INTERPOLATE(ase_color)
32.         #ifdef _WRITE_TRANSPARENT_MOTION_VECTOR
33.             TESS_INTERPOLATE(previousPositionOS)
34.             #if defined (_ADD_PRECOMPUTED_VELOCITY)
35.                 TESS_INTERPOLATE(precomputedVelocity)
36.             #endif
37.         #endif
38.     #elif defined(SHADOW_PASS)
39.         TESS_INTERPOLATE(positionOS)
40.         TESS_INTERPOLATE(normalOS)
41.         TESS_INTERPOLATE(tangentOS)
42.         TESS_INTERPOLATE(ase_texcoord)
43.         TESS_INTERPOLATE(ase_color)
44.     #elif defined(MOTION_VECTOR_PASS)
45.         TESS_INTERPOLATE(positionOS)
46.         TESS_INTERPOLATE(normalOS)
47.         TESS_INTERPOLATE(tangentOS)
48.         TESS_INTERPOLATE(ase_color)
49.         TESS_INTERPOLATE(ase_texcoord)
50.         TESS_INTERPOLATE(previousPositionOS)
51.         #if defined (_ADD_PRECOMPUTED_VELOCITY)
52.             TESS_INTERPOLATE(precomputedVelocity)
53.         #endif
54.     #endif
55.  
56.     return v;
57. }

But it's horribly tedious to write/adjust... I basically manually define within the shader which variables exist and include this domain function from another file.

Is there a way to just iterate through all variables within a struct and do TESS_INTERPOLATE() on each?
Something like

Code (CSharp):

1.  
2.     foreach(var property in AttributesMesh) {
3.         TESS_INTERPOLATE(property);
4.     }
5.  

would be amazing, though I'm pretty sure I'm coming at the problem wrong. For Amplify shader creations, there's no way to know which fields will exist or not, is there a dynamic way to just interpolate all the contents of a struct?