I have a vertex shader that takes a 3D position and an integer as input parameters. The vertex shader passes the integer to the geometry shader that will generates quads depending on that integer value. The relevant HLSL code looks as following:

struct VS_In {
    float4 p:  SV_POSITION;
    uint gType : TEXCOORD; 
};

void VShader(inout VS_In v) {
   v.p = mul(v.p, mTrans);
}

[maxvertexcount(8)]
void GShader(point VS_In input[1], inout TriangleStream<PS_In> stream )
{
    EpmitGlyph(stream, input[0].p, input[0].gType);
    ....
}

D3D11 ERROR: ID3D11DeviceContext::DrawIndexed: Input Assembler - Vertex Shader linkage error: Signatures between stages are incompatible. Semantic 'TEXCOORD' has mismatched data types between the output stage and input stage. [ EXECUTION ERROR #344: DEVICE_SHADER_LINKAGE_COMPONENTTYPE]

It looks like that the integer parameter gType has wrong data type, as TEXCOORD should be float4 according to HLSL documentation. I tried to use different sematics for the gType parameter, but none worked. My question is: Can I pass generic integer values to the vertex shader via the vertex buffer? If yes, how should I declare its semantic so that the debug layer doesn't complain about it?

Thank you for the reply. The following is my code to setup the input assembly:

Hi Jazon, thanks for the reply. The first index of InputElement() is indeed the semantic index; but the second index is the slot that identifies the input assembler. Thus, both of them need to be zero in this case. The struct VS_In is indeed both the input and the output signature of the vertex shader (as implied by the parameter modify "inout".) I guess that Debug Layer some how doesn't interpret this way; and report it as an error. For now, I just configure the debug layer to ignore this kind of errors, and it seemed to work so far.