#include <metal_stdlib>

using namespace metal;
struct S {
  /* 0x0000 */ packed_float3 v;
  /* 0x000c */ uint i;
};

float3 Bad(uint index, float3 rd) {
  float3 normal = float3(0.0f);
  normal[index] = -(sign(rd[index]));
  return normalize(normal);
}

kernel void tint_symbol(uint idx [[thread_index_in_threadgroup]], device S& io [[buffer(0)]]) {
  io.v = Bad(io.i, io.v);
  return;
}