struct MyStruct { sample float a; noperspective float b; linear float c; centroid float d; }; int sample(int x) { return x; } // HLSL allows this as an identifier as well. float4 main() : SV_Target0 { // HLSL allows this as an identifier as well. // However, this is not true of other qualifier keywords such as "linear". int sample = 3; return float4(0,0,0,0); }