float angle = 0;
float param = 0.849;

float x = inlet_x;
float y = inlet_y;
float x2 = x * x;
float y2 = y * y;
float xy = x * y;

int32_t region = 0;

bool sign_x = inlet_x > 0 ? 1 : 0;
bool sign_y = inlet_y > 0 ? 1 : 0;
bool yGx =
    ((sign_y ? inlet_y : -inlet_y) > (sign_x ? inlet_x : -inlet_x)); // |Y|>|X|

if (yGx) {
  if (sign_y)
    region = 2;
  else
    region = 4;
} else {
  if (sign_x)
    if (sign_y)
      region = 1;
    else
      region = 5;
  else
    region = 3;
}

if (!inlet_x && !inlet_y)
  region = 0;

switch (region) {
case 0:
  break;
case 1:
  angle = xy / (y2 + param * x2);
  break; // 0<theta<45
case 2:
  angle = 1.571f - xy / (x2 + param * y2);
  break; // 45<theta<135
case 3:
  angle = 3.142f + xy / (y2 + param * x2);
  break; // 135<theta<225
case 4:
  angle = 4.712f - xy / (x2 + param * y2);
  break; // 225<theta<315
case 5:
  angle = 6.283f + xy / (y2 + param * x2);
  break; // 315<theta<360
}

outlet_modulus = (int32_t)_VSQRTF((x2 + y2));
outlet_phase = (int32_t)(angle * 21361415.0f); // 2^28 / 3.1415