Reference

Default Vertex and Pixel Shader Inputs

If you're just opting for default Vertex and Pixel inputs which are usable on the default shading model, these are the reference member variables for each:

cpp

struct VertexInput
{
    float3 vPositionOs : POSITION < Semantic( PosXyz ); >;
    float2 vTexCoord : TEXCOORD0 < Semantic( LowPrecisionUv ); >;	
    float4 vNormalOs : NORMAL < Semantic( OptionallyCompressedTangentFrame ); >;
    float4 vTangentUOs_flTangentVSign : TANGENT	< Semantic( TangentU_SignV ); >;
    
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // Skinning
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    #if ( D_SKINNING > 0 )
    	uint4 vBlendIndices : BLENDINDICES 	< Semantic( BlendIndices ); >;
    	float4 vBlendWeight : BLENDWEIGHT 	< Semantic( BlendWeight ); >;
    #endif	
    	
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // SSS Curvature
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    #if ( S_USE_PER_VERTEX_CURVATURE )
    	float flSSSCurvature : TEXCOORD2 < Semantic( Curvature ); >;
    #endif
    
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // Morph
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    #if ( D_MORPH )
    	float nVertexIndex : TEXCOORD14 < Semantic( MorphIndex ); >;
    #endif
    
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // Instancing data
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    uint nInstanceTransformID : TEXCOORD13 < Semantic( InstanceTransformUv ); >;
    
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // Baked lighting
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    #if ( D_BAKED_LIGHTING_FROM_LIGHTMAP )	
    	float2 vLightmapUV : TEXCOORD3 < Semantic( LightmapUV ); > ;
    #endif
}

cpp

struct PixelInput
{
    #if ( PROGRAM == VFX_PROGRAM_PS )
    	float3 vPositionWithOffsetWs : TEXCOORD0;
    #else
    	float3 vPositionWs : TEXCOORD0;
    #endif
    
    float3 vNormalWs 		: TEXCOORD1;
    float4 vTextureCoords 	: TEXCOORD2;
    float4 vVertexColor 	: TEXCOORD4;

    #if ( PS_INPUT_HAS_TANGENT_BASIS )
		float3 vTangentUWs : TEXCOORD6; 
        float3 vTangentVWs : TEXCOORD7; 
    #endif

    #if ( S_USE_PER_VERTEX_CURVATURE )
    	float flSSSCurvature : TEXCOORD11;
    #endif

    centroid float2 vLightmapUV : TEXCOORD3;

    //-------------------------------------------------------------------------------------------------------------------------------------------------------------
    // System interpolants
    //-------------------------------------------------------------------------------------------------------------------------------------------------------------

    #if ( PROGRAM != VFX_PROGRAM_PS ) 
    	float4 vPositionPs : SV_Position;
    #else // PS only
    	float4 vPositionSs : SV_Position;
    	#if ( S_RENDER_BACKFACES )
    		bool face : SV_IsFrontFace;
    	#endif
    #endif
}

Different combos expose different feature sets for these