Help with Shader Error: "Undeclared Identifier"

Hey,

So I'm running into an error that doesn't make sense to me. Here's the error:



Here's the code in question:

Code (CSharp):

1. TessellationFactors PatchConstantFunction(
2.     InputPatch<TessellationControlPoint, 3> patch
3. ) {
4.     float3 p0 = mul(unity_ObjectToWorld, patch[0].vertex).xyz;
5.     float3 p1 = mul(unity_ObjectToWorld, patch[1].vertex).xyz;
6.     float3 p2 = mul(unity_ObjectToWorld, patch[2].vertex).xyz;
7.  
8.     half p0factor = tex2Dlod(_DispTex, float4(patch[0].uv.zw, 0, 0)).r;
9.     half p1factor = tex2Dlod(_DispTex, float4(patch[1].uv.zw, 0, 0)).r;
10.     half p2factor = tex2Dlod(_DispTex, float4(patch[2].uv.zw, 0, 0)).r;
11.     half p3factor = tex2Dlod(_DispTex, float4(((patch[1].uv.z) + (patch[2].uv.z)) / 2, (patch[1].uv.w + patch[2].uv.w) / 2, 0, 0)).r;
12.     half p4factor = tex2Dlod(_DispTex, float4(((patch[2].uv.z) + (patch[0].uv.z)) / 2, (patch[2].uv.w + patch[0].uv.w) / 2, 0, 0)).r;
13.     half p5factor = tex2Dlod(_DispTex, float4(((patch[0].uv.z) + (patch[1].uv.z)) / 2, (patch[0].uv.w + patch[1].uv.w) / 2, 0, 0)).r;
14.  
15.     // Right here
16.     half dispFactor = tex2Dlod(_DispMap, float4(patch[0].uv.xy, 0, 0)).r +
17.                       tex2Dlod(_DispMap, float4(patch[1].uv.xy, 0, 0)).r +
18.                       tex2Dlod(_DispMap, float4(patch[2].uv.xy, 0, 0)).r;
19.  
20.     half factor = (p0factor + p1factor + p2factor + p3factor + p4factor + p5factor + dispFactor);
21.  
22.     TessellationFactors f;
23.     f.edge[0] = factor > 0.0 ? TessellationEdgeFactor(p1, p2) : 1.0;
24.     f.edge[1] = factor > 0.0 ? TessellationEdgeFactor(p2, p0) : 1.0;
25.     f.edge[2] = factor > 0.0 ? TessellationEdgeFactor(p0, p1) : 1.0;
26.     f.inside = factor > 0.0 ? (TessellationEdgeFactor(p1, p2) +
27.                                TessellationEdgeFactor(p2, p0) +
28.                                TessellationEdgeFactor(p0, p1)) * (1 / 3.0) : 1.0;
29.  
30.     return f;

However, _DispMap is clearly defined in a separate .cginc file, and I'm able to use it elsewhere in my code. Anyone have any insight into this?

 

Is that separate cginc file #included at the top of SnowTessellation.cginc?

 

No. Here's how it's included:

Code (CSharp):

1. Pass
2.         {
3.             Tags { "LightMode"="ForwardBase" }
4.             CGPROGRAM
5.  
6.             #pragma target 4.6
7.  
8.             #pragma multi_compile_fwdbase
9.             #pragma multi_compile EDGE_LENGTH
10.  
11.             #pragma vertex TessellationVertexProgram
12.             #pragma fragment FragmentProgram
13.             #pragma hull HullProgram
14.             #pragma domain DomainProgram
15.  
16.             #define FORWARD_BASE_PASS
17.             #define TESSELLATION_TANGENT 1
18.  
19.             #include "SnowLighting.cginc"
20.             #include "SnowTessellation.cginc"
21.  
22.             ENDCG
23.         }

The vast majority of variables are defined in SnowLighting.cginc, and I'm able to use other ones defined in SnowLighting in SnowTessellation.

 

Oh wait, I found it! I was reorganizing the structure of my code, when I remembered that one of my passes doesn't use SnowLighting, so I had to define it in the other .cginc file in there.

Honestly, I feel like these forums are my rubber duck most of the time. Haha.