1OpCapability Shader 2%1 = OpExtInstImport "GLSL.std.450" 3OpMemoryModel Logical GLSL450 4OpEntryPoint Vertex %main "main" %sk_VertexID %id 5OpName %sk_VertexID "sk_VertexID" 6OpName %id "id" 7OpName %main "main" 8OpDecorate %sk_VertexID BuiltIn VertexIndex 9OpDecorate %id Location 1 10%int = OpTypeInt 32 1 11%_ptr_Input_int = OpTypePointer Input %int 12%sk_VertexID = OpVariable %_ptr_Input_int Input 13%_ptr_Output_int = OpTypePointer Output %int 14%id = OpVariable %_ptr_Output_int Output 15%void = OpTypeVoid 16%9 = OpTypeFunction %void 17%main = OpFunction %void None %9 18%10 = OpLabel 19%11 = OpLoad %int %sk_VertexID 20OpStore %id %11 21OpReturn 22OpFunctionEnd 23