{
  "revision" : 4,
  "instructions" : [
    {
      "opname" : "InterpolateAtVertexAMD",
      "opcode" : 1,
      "operands" : [
        { "kind" : "IdRef", "name" : "interpolant" },
        { "kind" : "IdRef", "name" : "vertexIdx" }
      ],
      "extensions" : [ "SPV_AMD_shader_explicit_vertex_parameter" ]
    }
  ]
}