fn main(@builtin(global_invocation_id) global_id : vec3<u32>,
        @builtin(workgroup_id) workgroup_id : vec3<u32>,
        @builtin(local_invocation_index) local_idx : u32,
        @builtin(local_invocation_id) local_id : vec3<u32>,
 @builtin(subgroup_invocation_id) sg_id : u32,
 @builtin(subgroup_size) sg_size : u32,
        @builtin(num_workgroups) num_workgroups : vec3<u32>) {

}