airport.cpp

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/*
 * This file is part of OpenTTD.
 * OpenTTD is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation, version 2.
 * OpenTTD is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
 * See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with OpenTTD. If not, see <http://www.gnu.org/licenses/>.
 */
 
#include "stdafx.h"
#include "station_base.h"
#include "table/strings.h"
#include "table/airport_movement.h"
#include "table/airporttile_ids.h"
 
#include "safeguards.h"
 
 
#define AIRPORT_GENERIC(name, terminals, num_helipads, flags, delta_z) \
  static const AirportFTAClass _airportfta_ ## name(_airport_moving_data_ ## name, terminals, \
      num_helipads, _airport_entries_ ## name, flags, _airport_fta_ ## name, delta_z);
 
#define AIRPORT(name, num_helipads, short_strip) \
  AIRPORT_GENERIC(name, _airport_terminal_ ## name, num_helipads, AirportFTAClass::ALL | (short_strip ? AirportFTAClass::SHORT_STRIP : (AirportFTAClass::Flags)0), 0)
 
#define HELIPORT(name, num_helipads, delta_z) \
  AIRPORT_GENERIC(name, nullptr, num_helipads, AirportFTAClass::HELICOPTERS, delta_z)
 
AIRPORT(country, 0, true)
AIRPORT(city, 0, false)
HELIPORT(heliport, 1, 60)
AIRPORT(metropolitan, 0, false)
AIRPORT(international, 2, false)
AIRPORT(commuter, 2, true)
HELIPORT(helidepot, 1, 0)
AIRPORT(intercontinental, 2, false)
HELIPORT(helistation, 3, 0)
HELIPORT(oilrig, 1, 54)
AIRPORT_GENERIC(dummy, nullptr, 0, AirportFTAClass::ALL, 0)
 
#undef HELIPORT
#undef AIRPORT
#undef AIRPORT_GENERIC
 
#include "table/airport_defaults.h"
 
 
static uint16_t AirportGetNofElements(const AirportFTAbuildup *apFA);
static AirportFTA *AirportBuildAutomata(uint nofelements, const AirportFTAbuildup *apFA);
 
 
AirportMovingData RotateAirportMovingData(const AirportMovingData *orig, Direction rotation, uint num_tiles_x, uint num_tiles_y)
{
  AirportMovingData amd;
  amd.flag = orig->flag;
  amd.direction = ChangeDir(orig->direction, (DirDiff)rotation);
  switch (rotation) {
    case DIR_N:
      amd.x = orig->x;
      amd.y = orig->y;
      break;
 
    case DIR_E:
      amd.x = orig->y;
      amd.y = num_tiles_y * TILE_SIZE - orig->x - 1;
      break;
 
    case DIR_S:
      amd.x = num_tiles_x * TILE_SIZE - orig->x - 1;
      amd.y = num_tiles_y * TILE_SIZE - orig->y - 1;
      break;
 
    case DIR_W:
      amd.x = num_tiles_x * TILE_SIZE - orig->y - 1;
      amd.y = orig->x;
      break;
 
    default: NOT_REACHED();
  }
  return amd;
}
 
AirportFTAClass::AirportFTAClass(
  const AirportMovingData *moving_data_,
  const byte *terminals_,
  const byte num_helipads_,
  const byte *entry_points_,
  Flags flags_,
  const AirportFTAbuildup *apFA,
  byte delta_z_
) :
  moving_data(moving_data_),
  terminals(terminals_),
  num_helipads(num_helipads_),
  flags(flags_),
  nofelements(AirportGetNofElements(apFA)),
  entry_points(entry_points_),
  delta_z(delta_z_)
{
  /* Build the state machine itself */
  this->layout = AirportBuildAutomata(this->nofelements, apFA);
}
 
AirportFTAClass::~AirportFTAClass()
{
  for (uint i = 0; i < nofelements; i++) {
    AirportFTA *current = layout[i].next;
    while (current != nullptr) {
      AirportFTA *next = current->next;
      free(current);
      current = next;
    }
  }
  free(layout);
}
 
static uint16_t AirportGetNofElements(const AirportFTAbuildup *apFA)
{
  uint16_t nofelements = 0;
  int temp = apFA[0].position;
 
  for (uint i = 0; i < MAX_ELEMENTS; i++) {
    if (temp != apFA[i].position) {
      nofelements++;
      temp = apFA[i].position;
    }
    if (apFA[i].position == MAX_ELEMENTS) break;
  }
  return nofelements;
}
 
static AirportFTA *AirportBuildAutomata(uint nofelements, const AirportFTAbuildup *apFA)
{
  AirportFTA *FAutomata = MallocT<AirportFTA>(nofelements);
  uint16_t internalcounter = 0;
 
  for (uint i = 0; i < nofelements; i++) {
    AirportFTA *current = &FAutomata[i];
    current->position      = apFA[internalcounter].position;
    current->heading       = apFA[internalcounter].heading;
    current->block         = apFA[internalcounter].block;
    current->next_position = apFA[internalcounter].next;
 
    /* outgoing nodes from the same position, create linked list */
    while (current->position == apFA[internalcounter + 1].position) {
      AirportFTA *newNode = MallocT<AirportFTA>(1);
 
      newNode->position      = apFA[internalcounter + 1].position;
      newNode->heading       = apFA[internalcounter + 1].heading;
      newNode->block         = apFA[internalcounter + 1].block;
      newNode->next_position = apFA[internalcounter + 1].next;
      /* create link */
      current->next = newNode;
      current = current->next;
      internalcounter++;
    }
    current->next = nullptr;
    internalcounter++;
  }
  return FAutomata;
}
 
const AirportFTAClass *GetAirport(const byte airport_type)
{
  if (airport_type == AT_DUMMY) return &_airportfta_dummy;
  return AirportSpec::Get(airport_type)->fsm;
}
 
byte GetVehiclePosOnBuild(TileIndex hangar_tile)
{
  const Station *st = Station::GetByTile(hangar_tile);
  const AirportFTAClass *apc = st->airport.GetFTA();
  /* When we click on hangar we know the tile it is on. By that we know
   * its position in the array of depots the airport has.....we can search
   * layout for #th position of depot. Since layout must start with a listing
   * of all depots, it is simple */
  for (uint i = 0;; i++) {
    if (st->airport.GetHangarTile(i) == hangar_tile) {
      assert(apc->layout[i].heading == HANGAR);
      return apc->layout[i].position;
    }
  }
  NOT_REACHED();
}