CCoreDispInfo::GetNodeVertIndexFromParentIndex

/* CCoreDispInfo::GetNodeVertIndexFromParentIndex(int, int, int) */

int __thiscall
CCoreDispInfo::GetNodeVertIndexFromParentIndex
          (CCoreDispInfo *this,int param_1,int param_2,int param_3)

{
  int iVar1;
  int iVar2;
  int iVar3;
  int iVar4;
  
  iVar4 = 1 << ((byte)*(undefined4 *)(this + 0xc) + ~(byte)param_1 & 0x1f);
  iVar3 = (1 << ((byte)*(undefined4 *)(this + 0xc) & 0x1f)) + 1;
  iVar1 = param_2 / iVar3;
  iVar2 = param_2 % iVar3;
  if (param_3 == 5) {
    iVar2 = iVar2 + iVar4;
    iVar1 = iVar1 - iVar4;
  }
  else if (param_3 < 6) {
    iVar2 = iVar2 - iVar4;
    iVar1 = iVar1 - iVar4;
    if (param_3 != 4) {
      return -99999;
    }
  }
  else if (param_3 == 6) {
    iVar2 = iVar2 - iVar4;
    iVar1 = iVar1 + iVar4;
  }
  else {
    iVar2 = iVar2 + iVar4;
    iVar1 = iVar1 + iVar4;
    if (param_3 != 7) {
      return -99999;
    }
  }
  return iVar1 * iVar3 + iVar2;
}