vehicle.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 "error.h"
#include "roadveh.h"
#include "ship.h"
#include "spritecache.h"
#include "timetable.h"
#include "viewport_func.h"
#include "news_func.h"
#include "command_func.h"
#include "company_func.h"
#include "train.h"
#include "aircraft.h"
#include "newgrf_debug.h"
#include "newgrf_sound.h"
#include "newgrf_station.h"
#include "group_gui.h"
#include "strings_func.h"
#include "zoom_func.h"
#include "date_func.h"
#include "vehicle_func.h"
#include "autoreplace_func.h"
#include "autoreplace_gui.h"
#include "station_base.h"
#include "ai/ai.hpp"
#include "depot_func.h"
#include "network/network.h"
#include "core/pool_func.hpp"
#include "economy_base.h"
#include "articulated_vehicles.h"
#include "roadstop_base.h"
#include "core/random_func.hpp"
#include "core/backup_type.hpp"
#include "order_backup.h"
#include "sound_func.h"
#include "effectvehicle_func.h"
#include "effectvehicle_base.h"
#include "vehiclelist.h"
#include "bridge_map.h"
#include "tunnel_map.h"
#include "depot_map.h"
#include "gamelog.h"
#include "linkgraph/linkgraph.h"
#include "linkgraph/refresh.h"
#include "framerate_type.h"
 
#include "table/strings.h"
 
#include "safeguards.h"
 
/* Number of bits in the hash to use from each vehicle coord */
static const uint GEN_HASHX_BITS = 6;
static const uint GEN_HASHY_BITS = 6;
 
/* Size of each hash bucket */
static const uint GEN_HASHX_BUCKET_BITS = 7;
static const uint GEN_HASHY_BUCKET_BITS = 6;
 
/* Compute hash for vehicle coord */
#define GEN_HASHX(x)    GB((x), GEN_HASHX_BUCKET_BITS + ZOOM_LVL_SHIFT, GEN_HASHX_BITS)
#define GEN_HASHY(y)   (GB((y), GEN_HASHY_BUCKET_BITS + ZOOM_LVL_SHIFT, GEN_HASHY_BITS) << GEN_HASHX_BITS)
#define GEN_HASH(x, y) (GEN_HASHY(y) + GEN_HASHX(x))
 
/* Maximum size until hash repeats */
static const int GEN_HASHX_SIZE = 1 << (GEN_HASHX_BUCKET_BITS + GEN_HASHX_BITS + ZOOM_LVL_SHIFT);
static const int GEN_HASHY_SIZE = 1 << (GEN_HASHY_BUCKET_BITS + GEN_HASHY_BITS + ZOOM_LVL_SHIFT);
 
/* Increments to reach next bucket in hash table */
static const int GEN_HASHX_INC = 1;
static const int GEN_HASHY_INC = 1 << GEN_HASHX_BITS;
 
/* Mask to wrap-around buckets */
static const uint GEN_HASHX_MASK =  (1 << GEN_HASHX_BITS) - 1;
static const uint GEN_HASHY_MASK = ((1 << GEN_HASHY_BITS) - 1) << GEN_HASHX_BITS;
 
VehicleID _new_vehicle_id;
uint _returned_refit_capacity;        
uint16 _returned_mail_refit_capacity; 
 
 
VehiclePool _vehicle_pool("Vehicle");
INSTANTIATE_POOL_METHODS(Vehicle)
 
 
 
void VehicleSpriteSeq::GetBounds(Rect *bounds) const
{
  bounds->left = bounds->top = bounds->right = bounds->bottom = 0;
  for (uint i = 0; i < this->count; ++i) {
    const Sprite *spr = GetSprite(this->seq[i].sprite, ST_NORMAL);
    if (i == 0) {
      bounds->left = spr->x_offs;
      bounds->top  = spr->y_offs;
      bounds->right  = spr->width  + spr->x_offs - 1;
      bounds->bottom = spr->height + spr->y_offs - 1;
    } else {
      if (spr->x_offs < bounds->left) bounds->left = spr->x_offs;
      if (spr->y_offs < bounds->top)  bounds->top  = spr->y_offs;
      int right  = spr->width  + spr->x_offs - 1;
      int bottom = spr->height + spr->y_offs - 1;
      if (right  > bounds->right)  bounds->right  = right;
      if (bottom > bounds->bottom) bounds->bottom = bottom;
    }
  }
}
 
void VehicleSpriteSeq::Draw(int x, int y, PaletteID default_pal, bool force_pal) const
{
  for (uint i = 0; i < this->count; ++i) {
    PaletteID pal = force_pal || !this->seq[i].pal ? default_pal : this->seq[i].pal;
    DrawSprite(this->seq[i].sprite, pal, x, y);
  }
}
 
bool Vehicle::NeedsAutorenewing(const Company *c, bool use_renew_setting) const
{
  /* We can always generate the Company pointer when we have the vehicle.
   * However this takes time and since the Company pointer is often present
   * when this function is called then it's faster to pass the pointer as an
   * argument rather than finding it again. */
  assert(c == Company::Get(this->owner));
 
  if (use_renew_setting && !c->settings.engine_renew) return false;
  if (this->age - this->max_age < (c->settings.engine_renew_months * 30)) return false;
 
  /* Only engines need renewing */
  if (this->type == VEH_TRAIN && !Train::From(this)->IsEngine()) return false;
 
  return true;
}
 
void VehicleServiceInDepot(Vehicle *v)
{
  assert(v != nullptr);
  SetWindowDirty(WC_VEHICLE_DETAILS, v->index); // ensure that last service date and reliability are updated
 
  do {
    v->date_of_last_service = _date;
    v->breakdowns_since_last_service = 0;
    v->reliability = v->GetEngine()->reliability;
    /* Prevent vehicles from breaking down directly after exiting the depot. */
    v->breakdown_chance /= 4;
    if (_settings_game.difficulty.vehicle_breakdowns == 1) v->breakdown_chance = 0; // on reduced breakdown
    v = v->Next();
  } while (v != nullptr && v->HasEngineType());
}
 
bool Vehicle::NeedsServicing() const
{
  /* Stopped or crashed vehicles will not move, as such making unmovable
   * vehicles to go for service is lame. */
  if (this->vehstatus & (VS_STOPPED | VS_CRASHED)) return false;
 
  /* Are we ready for the next service cycle? */
  const Company *c = Company::Get(this->owner);
  if (this->ServiceIntervalIsPercent() ?
      (this->reliability >= this->GetEngine()->reliability * (100 - this->GetServiceInterval()) / 100) :
      (this->date_of_last_service + this->GetServiceInterval() >= _date)) {
    return false;
  }
 
  /* If we're servicing anyway, because we have not disabled servicing when
   * there are no breakdowns or we are playing with breakdowns, bail out. */
  if (!_settings_game.order.no_servicing_if_no_breakdowns ||
      _settings_game.difficulty.vehicle_breakdowns != 0) {
    return true;
  }
 
  /* Test whether there is some pending autoreplace.
   * Note: We do this after the service-interval test.
   * There are a lot more reasons for autoreplace to fail than we can test here reasonably. */
  bool pending_replace = false;
  Money needed_money = c->settings.engine_renew_money;
  if (needed_money > c->money) return false;
 
  for (const Vehicle *v = this; v != nullptr; v = (v->type == VEH_TRAIN) ? Train::From(v)->GetNextUnit() : nullptr) {
    bool replace_when_old = false;
    EngineID new_engine = EngineReplacementForCompany(c, v->engine_type, v->group_id, &replace_when_old);
 
    /* Check engine availability */
    if (new_engine == INVALID_ENGINE || !HasBit(Engine::Get(new_engine)->company_avail, v->owner)) continue;
    /* Is the vehicle old if we are not always replacing? */
    if (replace_when_old && !v->NeedsAutorenewing(c, false)) continue;
 
    /* Check refittability */
    CargoTypes available_cargo_types, union_mask;
    GetArticulatedRefitMasks(new_engine, true, &union_mask, &available_cargo_types);
    /* Is there anything to refit? */
    if (union_mask != 0) {
      CargoID cargo_type;
      /* We cannot refit to mixed cargoes in an automated way */
      if (IsArticulatedVehicleCarryingDifferentCargoes(v, &cargo_type)) continue;
 
      /* Did the old vehicle carry anything? */
      if (cargo_type != CT_INVALID) {
        /* We can't refit the vehicle to carry the cargo we want */
        if (!HasBit(available_cargo_types, cargo_type)) continue;
      }
    }
 
    /* Check money.
     * We want 2*(the price of the new vehicle) without looking at the value of the vehicle we are going to sell. */
    pending_replace = true;
    needed_money += 2 * Engine::Get(new_engine)->GetCost();
    if (needed_money > c->money) return false;
  }
 
  return pending_replace;
}
 
bool Vehicle::NeedsAutomaticServicing() const
{
  if (this->HasDepotOrder()) return false;
  if (this->current_order.IsType(OT_LOADING)) return false;
  if (this->current_order.IsType(OT_GOTO_DEPOT) && this->current_order.GetDepotOrderType() != ODTFB_SERVICE) return false;
  return NeedsServicing();
}
 
uint Vehicle::Crash(bool flooded)
{
  assert((this->vehstatus & VS_CRASHED) == 0);
  assert(this->Previous() == nullptr); // IsPrimaryVehicle fails for free-wagon-chains
 
  uint pass = 0;
  /* Stop the vehicle. */
  if (this->IsPrimaryVehicle()) this->vehstatus |= VS_STOPPED;
  /* crash all wagons, and count passengers */
  for (Vehicle *v = this; v != nullptr; v = v->Next()) {
    /* We do not transfer reserver cargo back, so TotalCount() instead of StoredCount() */
    if (IsCargoInClass(v->cargo_type, CC_PASSENGERS)) pass += v->cargo.TotalCount();
    v->vehstatus |= VS_CRASHED;
    v->MarkAllViewportsDirty();
  }
 
  /* Dirty some windows */
  InvalidateWindowClassesData(GetWindowClassForVehicleType(this->type), 0);
  SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
  SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
  SetWindowDirty(WC_VEHICLE_DEPOT, this->tile);
 
  delete this->cargo_payment;
  assert(this->cargo_payment == nullptr); // cleared by ~CargoPayment
 
  return RandomRange(pass + 1); // Randomise deceased passengers.
}
 
 
void ShowNewGrfVehicleError(EngineID engine, StringID part1, StringID part2, GRFBugs bug_type, bool critical)
{
  const Engine *e = Engine::Get(engine);
  GRFConfig *grfconfig = GetGRFConfig(e->GetGRFID());
 
  /* Missing GRF. Nothing useful can be done in this situation. */
  if (grfconfig == nullptr) return;
 
  if (!HasBit(grfconfig->grf_bugs, bug_type)) {
    SetBit(grfconfig->grf_bugs, bug_type);
    SetDParamStr(0, grfconfig->GetName());
    SetDParam(1, engine);
    ShowErrorMessage(part1, part2, WL_CRITICAL);
    if (!_networking) DoCommand(0, critical ? PM_PAUSED_ERROR : PM_PAUSED_NORMAL, 1, DC_EXEC, CMD_PAUSE);
  }
 
  /* debug output */
  char buffer[512];
 
  SetDParamStr(0, grfconfig->GetName());
  GetString(buffer, part1, lastof(buffer));
  Debug(grf, 0, "{}", buffer + 3);
 
  SetDParam(1, engine);
  GetString(buffer, part2, lastof(buffer));
  Debug(grf, 0, "{}", buffer + 3);
}
 
void VehicleLengthChanged(const Vehicle *u)
{
  /* show a warning once for each engine in whole game and once for each GRF after each game load */
  const Engine *engine = u->GetEngine();
  uint32 grfid = engine->grf_prop.grffile->grfid;
  GRFConfig *grfconfig = GetGRFConfig(grfid);
  if (GamelogGRFBugReverse(grfid, engine->grf_prop.local_id) || !HasBit(grfconfig->grf_bugs, GBUG_VEH_LENGTH)) {
    ShowNewGrfVehicleError(u->engine_type, STR_NEWGRF_BROKEN, STR_NEWGRF_BROKEN_VEHICLE_LENGTH, GBUG_VEH_LENGTH, true);
  }
}
 
Vehicle::Vehicle(VehicleType type)
{
  this->type               = type;
  this->coord.left         = INVALID_COORD;
  this->sprite_cache.old_coord.left = INVALID_COORD;
  this->group_id           = DEFAULT_GROUP;
  this->fill_percent_te_id = INVALID_TE_ID;
  this->first              = this;
  this->colourmap          = PAL_NONE;
  this->cargo_age_counter  = 1;
  this->last_station_visited = INVALID_STATION;
  this->last_loading_station = INVALID_STATION;
}
 
byte VehicleRandomBits()
{
  return GB(Random(), 0, 8);
}
 
/* Size of the hash, 6 = 64 x 64, 7 = 128 x 128. Larger sizes will (in theory) reduce hash
 * lookup times at the expense of memory usage. */
const int HASH_BITS = 7;
const int HASH_SIZE = 1 << HASH_BITS;
const int HASH_MASK = HASH_SIZE - 1;
const int TOTAL_HASH_SIZE = 1 << (HASH_BITS * 2);
const int TOTAL_HASH_MASK = TOTAL_HASH_SIZE - 1;
 
/* Resolution of the hash, 0 = 1*1 tile, 1 = 2*2 tiles, 2 = 4*4 tiles, etc.
 * Profiling results show that 0 is fastest. */
const int HASH_RES = 0;
 
static Vehicle *_vehicle_tile_hash[TOTAL_HASH_SIZE];
 
static Vehicle *VehicleFromTileHash(int xl, int yl, int xu, int yu, void *data, VehicleFromPosProc *proc, bool find_first)
{
  for (int y = yl; ; y = (y + (1 << HASH_BITS)) & (HASH_MASK << HASH_BITS)) {
    for (int x = xl; ; x = (x + 1) & HASH_MASK) {
      Vehicle *v = _vehicle_tile_hash[(x + y) & TOTAL_HASH_MASK];
      for (; v != nullptr; v = v->hash_tile_next) {
        Vehicle *a = proc(v, data);
        if (find_first && a != nullptr) return a;
      }
      if (x == xu) break;
    }
    if (y == yu) break;
  }
 
  return nullptr;
}
 
 
static Vehicle *VehicleFromPosXY(int x, int y, void *data, VehicleFromPosProc *proc, bool find_first)
{
  const int COLL_DIST = 6;
 
  /* Hash area to scan is from xl,yl to xu,yu */
  int xl = GB((x - COLL_DIST) / TILE_SIZE, HASH_RES, HASH_BITS);
  int xu = GB((x + COLL_DIST) / TILE_SIZE, HASH_RES, HASH_BITS);
  int yl = GB((y - COLL_DIST) / TILE_SIZE, HASH_RES, HASH_BITS) << HASH_BITS;
  int yu = GB((y + COLL_DIST) / TILE_SIZE, HASH_RES, HASH_BITS) << HASH_BITS;
 
  return VehicleFromTileHash(xl, yl, xu, yu, data, proc, find_first);
}
 
void FindVehicleOnPosXY(int x, int y, void *data, VehicleFromPosProc *proc)
{
  VehicleFromPosXY(x, y, data, proc, false);
}
 
bool HasVehicleOnPosXY(int x, int y, void *data, VehicleFromPosProc *proc)
{
  return VehicleFromPosXY(x, y, data, proc, true) != nullptr;
}
 
static Vehicle *VehicleFromPos(TileIndex tile, void *data, VehicleFromPosProc *proc, bool find_first)
{
  int x = GB(TileX(tile), HASH_RES, HASH_BITS);
  int y = GB(TileY(tile), HASH_RES, HASH_BITS) << HASH_BITS;
 
  Vehicle *v = _vehicle_tile_hash[(x + y) & TOTAL_HASH_MASK];
  for (; v != nullptr; v = v->hash_tile_next) {
    if (v->tile != tile) continue;
 
    Vehicle *a = proc(v, data);
    if (find_first && a != nullptr) return a;
  }
 
  return nullptr;
}
 
void FindVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc)
{
  VehicleFromPos(tile, data, proc, false);
}
 
bool HasVehicleOnPos(TileIndex tile, void *data, VehicleFromPosProc *proc)
{
  return VehicleFromPos(tile, data, proc, true) != nullptr;
}
 
static Vehicle *EnsureNoVehicleProcZ(Vehicle *v, void *data)
{
  int z = *(int*)data;
 
  if (v->type == VEH_DISASTER || (v->type == VEH_AIRCRAFT && v->subtype == AIR_SHADOW)) return nullptr;
  if (v->z_pos > z) return nullptr;
 
  return v;
}
 
CommandCost EnsureNoVehicleOnGround(TileIndex tile)
{
  int z = GetTileMaxPixelZ(tile);
 
  /* Value v is not safe in MP games, however, it is used to generate a local
   * error message only (which may be different for different machines).
   * Such a message does not affect MP synchronisation.
   */
  Vehicle *v = VehicleFromPos(tile, &z, &EnsureNoVehicleProcZ, true);
  if (v != nullptr) return_cmd_error(STR_ERROR_TRAIN_IN_THE_WAY + v->type);
  return CommandCost();
}
 
static Vehicle *GetVehicleTunnelBridgeProc(Vehicle *v, void *data)
{
  if (v->type != VEH_TRAIN && v->type != VEH_ROAD && v->type != VEH_SHIP) return nullptr;
  if (v == (const Vehicle *)data) return nullptr;
 
  return v;
}
 
CommandCost TunnelBridgeIsFree(TileIndex tile, TileIndex endtile, const Vehicle *ignore)
{
  /* Value v is not safe in MP games, however, it is used to generate a local
   * error message only (which may be different for different machines).
   * Such a message does not affect MP synchronisation.
   */
  Vehicle *v = VehicleFromPos(tile, const_cast<Vehicle *>(ignore), &GetVehicleTunnelBridgeProc, true);
  if (v == nullptr) v = VehicleFromPos(endtile, const_cast<Vehicle *>(ignore), &GetVehicleTunnelBridgeProc, true);
 
  if (v != nullptr) return_cmd_error(STR_ERROR_TRAIN_IN_THE_WAY + v->type);
  return CommandCost();
}
 
static Vehicle *EnsureNoTrainOnTrackProc(Vehicle *v, void *data)
{
  TrackBits rail_bits = *(TrackBits *)data;
 
  if (v->type != VEH_TRAIN) return nullptr;
 
  Train *t = Train::From(v);
  if ((t->track != rail_bits) && !TracksOverlap(t->track | rail_bits)) return nullptr;
 
  return v;
}
 
CommandCost EnsureNoTrainOnTrackBits(TileIndex tile, TrackBits track_bits)
{
  /* Value v is not safe in MP games, however, it is used to generate a local
   * error message only (which may be different for different machines).
   * Such a message does not affect MP synchronisation.
   */
  Vehicle *v = VehicleFromPos(tile, &track_bits, &EnsureNoTrainOnTrackProc, true);
  if (v != nullptr) return_cmd_error(STR_ERROR_TRAIN_IN_THE_WAY + v->type);
  return CommandCost();
}
 
static void UpdateVehicleTileHash(Vehicle *v, bool remove)
{
  Vehicle **old_hash = v->hash_tile_current;
  Vehicle **new_hash;
 
  if (remove) {
    new_hash = nullptr;
  } else {
    int x = GB(TileX(v->tile), HASH_RES, HASH_BITS);
    int y = GB(TileY(v->tile), HASH_RES, HASH_BITS) << HASH_BITS;
    new_hash = &_vehicle_tile_hash[(x + y) & TOTAL_HASH_MASK];
  }
 
  if (old_hash == new_hash) return;
 
  /* Remove from the old position in the hash table */
  if (old_hash != nullptr) {
    if (v->hash_tile_next != nullptr) v->hash_tile_next->hash_tile_prev = v->hash_tile_prev;
    *v->hash_tile_prev = v->hash_tile_next;
  }
 
  /* Insert vehicle at beginning of the new position in the hash table */
  if (new_hash != nullptr) {
    v->hash_tile_next = *new_hash;
    if (v->hash_tile_next != nullptr) v->hash_tile_next->hash_tile_prev = &v->hash_tile_next;
    v->hash_tile_prev = new_hash;
    *new_hash = v;
  }
 
  /* Remember current hash position */
  v->hash_tile_current = new_hash;
}
 
static Vehicle *_vehicle_viewport_hash[1 << (GEN_HASHX_BITS + GEN_HASHY_BITS)];
 
static void UpdateVehicleViewportHash(Vehicle *v, int x, int y, int old_x, int old_y)
{
  Vehicle **old_hash, **new_hash;
 
  new_hash = (x == INVALID_COORD) ? nullptr : &_vehicle_viewport_hash[GEN_HASH(x, y)];
  old_hash = (old_x == INVALID_COORD) ? nullptr : &_vehicle_viewport_hash[GEN_HASH(old_x, old_y)];
 
  if (old_hash == new_hash) return;
 
  /* remove from hash table? */
  if (old_hash != nullptr) {
    if (v->hash_viewport_next != nullptr) v->hash_viewport_next->hash_viewport_prev = v->hash_viewport_prev;
    *v->hash_viewport_prev = v->hash_viewport_next;
  }
 
  /* insert into hash table? */
  if (new_hash != nullptr) {
    v->hash_viewport_next = *new_hash;
    if (v->hash_viewport_next != nullptr) v->hash_viewport_next->hash_viewport_prev = &v->hash_viewport_next;
    v->hash_viewport_prev = new_hash;
    *new_hash = v;
  }
}
 
void ResetVehicleHash()
{
  for (Vehicle *v : Vehicle::Iterate()) { v->hash_tile_current = nullptr; }
  memset(_vehicle_viewport_hash, 0, sizeof(_vehicle_viewport_hash));
  memset(_vehicle_tile_hash, 0, sizeof(_vehicle_tile_hash));
}
 
void ResetVehicleColourMap()
{
  for (Vehicle *v : Vehicle::Iterate()) { v->colourmap = PAL_NONE; }
}
 
typedef SmallMap<Vehicle *, bool> AutoreplaceMap;
static AutoreplaceMap _vehicles_to_autoreplace;
 
void InitializeVehicles()
{
  _vehicles_to_autoreplace.clear();
  _vehicles_to_autoreplace.shrink_to_fit();
  ResetVehicleHash();
}
 
uint CountVehiclesInChain(const Vehicle *v)
{
  uint count = 0;
  do count++; while ((v = v->Next()) != nullptr);
  return count;
}
 
bool Vehicle::IsEngineCountable() const
{
  switch (this->type) {
    case VEH_AIRCRAFT: return Aircraft::From(this)->IsNormalAircraft(); // don't count plane shadows and helicopter rotors
    case VEH_TRAIN:
      return !this->IsArticulatedPart() && // tenders and other articulated parts
          !Train::From(this)->IsRearDualheaded(); // rear parts of multiheaded engines
    case VEH_ROAD: return RoadVehicle::From(this)->IsFrontEngine();
    case VEH_SHIP: return true;
    default: return false; // Only count company buildable vehicles
  }
}
 
bool Vehicle::HasEngineType() const
{
  switch (this->type) {
    case VEH_AIRCRAFT: return Aircraft::From(this)->IsNormalAircraft();
    case VEH_TRAIN:
    case VEH_ROAD:
    case VEH_SHIP: return true;
    default: return false;
  }
}
 
const Engine *Vehicle::GetEngine() const
{
  return Engine::Get(this->engine_type);
}
 
const GRFFile *Vehicle::GetGRF() const
{
  return this->GetEngine()->GetGRF();
}
 
uint32 Vehicle::GetGRFID() const
{
  return this->GetEngine()->GetGRFID();
}
 
void Vehicle::ShiftDates(int interval)
{
  this->date_of_last_service += interval;
}
 
void Vehicle::HandlePathfindingResult(bool path_found)
{
  if (path_found) {
    /* Route found, is the vehicle marked with "lost" flag? */
    if (!HasBit(this->vehicle_flags, VF_PATHFINDER_LOST)) return;
 
    /* Clear the flag as the PF's problem was solved. */
    ClrBit(this->vehicle_flags, VF_PATHFINDER_LOST);
    SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
    InvalidateWindowClassesData(GetWindowClassForVehicleType(this->type));
    /* Delete the news item. */
    DeleteVehicleNews(this->index, STR_NEWS_VEHICLE_IS_LOST);
    return;
  }
 
  /* Were we already lost? */
  if (HasBit(this->vehicle_flags, VF_PATHFINDER_LOST)) return;
 
  /* It is first time the problem occurred, set the "lost" flag. */
  SetBit(this->vehicle_flags, VF_PATHFINDER_LOST);
  SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
  InvalidateWindowClassesData(GetWindowClassForVehicleType(this->type));
  /* Notify user about the event. */
  AI::NewEvent(this->owner, new ScriptEventVehicleLost(this->index));
  if (_settings_client.gui.lost_vehicle_warn && this->owner == _local_company) {
    SetDParam(0, this->index);
    AddVehicleAdviceNewsItem(STR_NEWS_VEHICLE_IS_LOST, this->index);
  }
}
 
void Vehicle::PreDestructor()
{
  if (CleaningPool()) return;
 
  if (Station::IsValidID(this->last_station_visited)) {
    Station *st = Station::Get(this->last_station_visited);
    st->loading_vehicles.remove(this);
 
    HideFillingPercent(&this->fill_percent_te_id);
    this->CancelReservation(INVALID_STATION, st);
    delete this->cargo_payment;
    assert(this->cargo_payment == nullptr); // cleared by ~CargoPayment
  }
 
  if (this->IsEngineCountable()) {
    GroupStatistics::CountEngine(this, -1);
    if (this->IsPrimaryVehicle()) GroupStatistics::CountVehicle(this, -1);
    GroupStatistics::UpdateAutoreplace(this->owner);
 
    if (this->owner == _local_company) InvalidateAutoreplaceWindow(this->engine_type, this->group_id);
    DeleteGroupHighlightOfVehicle(this);
  }
 
  if (this->type == VEH_AIRCRAFT && this->IsPrimaryVehicle()) {
    Aircraft *a = Aircraft::From(this);
    Station *st = GetTargetAirportIfValid(a);
    if (st != nullptr) {
      const AirportFTA *layout = st->airport.GetFTA()->layout;
      CLRBITS(st->airport.flags, layout[a->previous_pos].block | layout[a->pos].block);
    }
  }
 
 
  if (this->type == VEH_ROAD && this->IsPrimaryVehicle()) {
    RoadVehicle *v = RoadVehicle::From(this);
    if (!(v->vehstatus & VS_CRASHED) && IsInsideMM(v->state, RVSB_IN_DT_ROAD_STOP, RVSB_IN_DT_ROAD_STOP_END)) {
      /* Leave the drive through roadstop, when you have not already left it. */
      RoadStop::GetByTile(v->tile, GetRoadStopType(v->tile))->Leave(v);
    }
  }
 
  if (this->Previous() == nullptr) {
    InvalidateWindowData(WC_VEHICLE_DEPOT, this->tile);
  }
 
  if (this->IsPrimaryVehicle()) {
    CloseWindowById(WC_VEHICLE_VIEW, this->index);
    CloseWindowById(WC_VEHICLE_ORDERS, this->index);
    CloseWindowById(WC_VEHICLE_REFIT, this->index);
    CloseWindowById(WC_VEHICLE_DETAILS, this->index);
    CloseWindowById(WC_VEHICLE_TIMETABLE, this->index);
    SetWindowDirty(WC_COMPANY, this->owner);
    OrderBackup::ClearVehicle(this);
  }
  InvalidateWindowClassesData(GetWindowClassForVehicleType(this->type), 0);
 
  this->cargo.Truncate();
  DeleteVehicleOrders(this);
  DeleteDepotHighlightOfVehicle(this);
 
  extern void StopGlobalFollowVehicle(const Vehicle *v);
  StopGlobalFollowVehicle(this);
 
  ReleaseDisastersTargetingVehicle(this->index);
}
 
Vehicle::~Vehicle()
{
  if (CleaningPool()) {
    this->cargo.OnCleanPool();
    return;
  }
 
  /* sometimes, eg. for disaster vehicles, when company bankrupts, when removing crashed/flooded vehicles,
   * it may happen that vehicle chain is deleted when visible */
  if (!(this->vehstatus & VS_HIDDEN)) this->MarkAllViewportsDirty();
 
  Vehicle *v = this->Next();
  this->SetNext(nullptr);
 
  delete v;
 
  UpdateVehicleTileHash(this, true);
  UpdateVehicleViewportHash(this, INVALID_COORD, 0, this->sprite_cache.old_coord.left, this->sprite_cache.old_coord.top);
  DeleteVehicleNews(this->index, INVALID_STRING_ID);
  DeleteNewGRFInspectWindow(GetGrfSpecFeature(this->type), this->index);
}
 
void VehicleEnteredDepotThisTick(Vehicle *v)
{
  /* Vehicle should stop in the depot if it was in 'stopping' state */
  _vehicles_to_autoreplace[v] = !(v->vehstatus & VS_STOPPED);
 
  /* We ALWAYS set the stopped state. Even when the vehicle does not plan on
   * stopping in the depot, so we stop it to ensure that it will not reserve
   * the path out of the depot before we might autoreplace it to a different
   * engine. The new engine would not own the reserved path we store that we
   * stopped the vehicle, so autoreplace can start it again */
  v->vehstatus |= VS_STOPPED;
}
 
static void RunVehicleDayProc()
{
  if (_game_mode != GM_NORMAL) return;
 
  /* Run the day_proc for every DAY_TICKS vehicle starting at _date_fract. */
  for (size_t i = _date_fract; i < Vehicle::GetPoolSize(); i += DAY_TICKS) {
    Vehicle *v = Vehicle::Get(i);
    if (v == nullptr) continue;
 
    /* Call the 32-day callback if needed */
    if ((v->day_counter & 0x1F) == 0 && v->HasEngineType()) {
      uint16 callback = GetVehicleCallback(CBID_VEHICLE_32DAY_CALLBACK, 0, 0, v->engine_type, v);
      if (callback != CALLBACK_FAILED) {
        if (HasBit(callback, 0)) {
          TriggerVehicle(v, VEHICLE_TRIGGER_CALLBACK_32); // Trigger vehicle trigger 10
        }
 
        /* After a vehicle trigger, the graphics and properties of the vehicle could change.
         * Note: MarkDirty also invalidates the palette, which is the meaning of bit 1. So, nothing special there. */
        if (callback != 0) v->First()->MarkDirty();
 
        if (callback & ~3) ErrorUnknownCallbackResult(v->GetGRFID(), CBID_VEHICLE_32DAY_CALLBACK, callback);
      }
    }
 
    /* This is called once per day for each vehicle, but not in the first tick of the day */
    v->OnNewDay();
  }
}
 
void CallVehicleTicks()
{
  _vehicles_to_autoreplace.clear();
 
  RunVehicleDayProc();
 
  {
    PerformanceMeasurer framerate(PFE_GL_ECONOMY);
    for (Station *st : Station::Iterate()) LoadUnloadStation(st);
  }
  PerformanceAccumulator::Reset(PFE_GL_TRAINS);
  PerformanceAccumulator::Reset(PFE_GL_ROADVEHS);
  PerformanceAccumulator::Reset(PFE_GL_SHIPS);
  PerformanceAccumulator::Reset(PFE_GL_AIRCRAFT);
 
  for (Vehicle *v : Vehicle::Iterate()) {
    [[maybe_unused]] size_t vehicle_index = v->index;
 
    /* Vehicle could be deleted in this tick */
    if (!v->Tick()) {
      assert(Vehicle::Get(vehicle_index) == nullptr);
      continue;
    }
 
    assert(Vehicle::Get(vehicle_index) == v);
 
    switch (v->type) {
      default: break;
 
      case VEH_TRAIN:
      case VEH_ROAD:
      case VEH_AIRCRAFT:
      case VEH_SHIP: {
        Vehicle *front = v->First();
 
        if (v->vcache.cached_cargo_age_period != 0) {
          v->cargo_age_counter = std::min(v->cargo_age_counter, v->vcache.cached_cargo_age_period);
          if (--v->cargo_age_counter == 0) {
            v->cargo.AgeCargo();
            v->cargo_age_counter = v->vcache.cached_cargo_age_period;
          }
        }
 
        /* Do not play any sound when crashed */
        if (front->vehstatus & VS_CRASHED) continue;
 
        /* Do not play any sound when in depot or tunnel */
        if (v->vehstatus & VS_HIDDEN) continue;
 
        /* Do not play any sound when stopped */
        if ((front->vehstatus & VS_STOPPED) && (front->type != VEH_TRAIN || front->cur_speed == 0)) continue;
 
        /* Check vehicle type specifics */
        switch (v->type) {
          case VEH_TRAIN:
            if (Train::From(v)->IsWagon()) continue;
            break;
 
          case VEH_ROAD:
            if (!RoadVehicle::From(v)->IsFrontEngine()) continue;
            break;
 
          case VEH_AIRCRAFT:
            if (!Aircraft::From(v)->IsNormalAircraft()) continue;
            break;
 
          default:
            break;
        }
 
        v->motion_counter += front->cur_speed;
        /* Play a running sound if the motion counter passes 256 (Do we not skip sounds?) */
        if (GB(v->motion_counter, 0, 8) < front->cur_speed) PlayVehicleSound(v, VSE_RUNNING);
 
        /* Play an alternating running sound every 16 ticks */
        if (GB(v->tick_counter, 0, 4) == 0) {
          /* Play running sound when speed > 0 and not braking */
          bool running = (front->cur_speed > 0) && !(front->vehstatus & (VS_STOPPED | VS_TRAIN_SLOWING));
          PlayVehicleSound(v, running ? VSE_RUNNING_16 : VSE_STOPPED_16);
        }
 
        break;
      }
    }
  }
 
  Backup<CompanyID> cur_company(_current_company, FILE_LINE);
  for (auto &it : _vehicles_to_autoreplace) {
    Vehicle *v = it.first;
    /* Autoreplace needs the current company set as the vehicle owner */
    cur_company.Change(v->owner);
 
    /* Start vehicle if we stopped them in VehicleEnteredDepotThisTick()
     * We need to stop them between VehicleEnteredDepotThisTick() and here or we risk that
     * they are already leaving the depot again before being replaced. */
    if (it.second) v->vehstatus &= ~VS_STOPPED;
 
    /* Store the position of the effect as the vehicle pointer will become invalid later */
    int x = v->x_pos;
    int y = v->y_pos;
    int z = v->z_pos;
 
    const Company *c = Company::Get(_current_company);
    SubtractMoneyFromCompany(CommandCost(EXPENSES_NEW_VEHICLES, (Money)c->settings.engine_renew_money));
    CommandCost res = DoCommand(0, v->index, 0, DC_EXEC, CMD_AUTOREPLACE_VEHICLE);
    SubtractMoneyFromCompany(CommandCost(EXPENSES_NEW_VEHICLES, -(Money)c->settings.engine_renew_money));
 
    if (!IsLocalCompany()) continue;
 
    if (res.Succeeded() && res.GetCost() != 0) {
      ShowCostOrIncomeAnimation(x, y, z, res.GetCost());
      continue;
    }
 
    StringID error_message = res.GetErrorMessage();
    if (error_message == STR_ERROR_AUTOREPLACE_NOTHING_TO_DO || error_message == INVALID_STRING_ID) continue;
 
    if (error_message == STR_ERROR_NOT_ENOUGH_CASH_REQUIRES_CURRENCY) error_message = STR_ERROR_AUTOREPLACE_MONEY_LIMIT;
 
    StringID message;
    if (error_message == STR_ERROR_TRAIN_TOO_LONG_AFTER_REPLACEMENT) {
      message = error_message;
    } else {
      message = STR_NEWS_VEHICLE_AUTORENEW_FAILED;
    }
 
    SetDParam(0, v->index);
    SetDParam(1, error_message);
    AddVehicleAdviceNewsItem(message, v->index);
  }
 
  cur_company.Restore();
}
 
static void DoDrawVehicle(const Vehicle *v)
{
  PaletteID pal = PAL_NONE;
 
  if (v->vehstatus & VS_DEFPAL) pal = (v->vehstatus & VS_CRASHED) ? PALETTE_CRASH : GetVehiclePalette(v);
 
  /* Check whether the vehicle shall be transparent due to the game state */
  bool shadowed = (v->vehstatus & VS_SHADOW) != 0;
 
  if (v->type == VEH_EFFECT) {
    /* Check whether the vehicle shall be transparent/invisible due to GUI settings.
     * However, transparent smoke and bubbles look weird, so always hide them. */
    TransparencyOption to = EffectVehicle::From(v)->GetTransparencyOption();
    if (to != TO_INVALID && (IsTransparencySet(to) || IsInvisibilitySet(to))) return;
  }
 
  StartSpriteCombine();
  for (uint i = 0; i < v->sprite_cache.sprite_seq.count; ++i) {
    PaletteID pal2 = v->sprite_cache.sprite_seq.seq[i].pal;
    if (!pal2 || (v->vehstatus & VS_CRASHED)) pal2 = pal;
    AddSortableSpriteToDraw(v->sprite_cache.sprite_seq.seq[i].sprite, pal2, v->x_pos + v->x_offs, v->y_pos + v->y_offs,
      v->x_extent, v->y_extent, v->z_extent, v->z_pos, shadowed, v->x_bb_offs, v->y_bb_offs);
  }
  EndSpriteCombine();
}
 
void ViewportAddVehicles(DrawPixelInfo *dpi)
{
  /* The bounding rectangle */
  const int l = dpi->left;
  const int r = dpi->left + dpi->width;
  const int t = dpi->top;
  const int b = dpi->top + dpi->height;
 
  /* Border size of MAX_VEHICLE_PIXEL_xy */
  const int xb = MAX_VEHICLE_PIXEL_X * ZOOM_LVL_BASE;
  const int yb = MAX_VEHICLE_PIXEL_Y * ZOOM_LVL_BASE;
 
  /* The hash area to scan */
  int xl, xu, yl, yu;
 
  if (dpi->width + xb < GEN_HASHX_SIZE) {
    xl = GEN_HASHX(l - xb);
    xu = GEN_HASHX(r);
  } else {
    /* scan whole hash row */
    xl = 0;
    xu = GEN_HASHX_MASK;
  }
 
  if (dpi->height + yb < GEN_HASHY_SIZE) {
    yl = GEN_HASHY(t - yb);
    yu = GEN_HASHY(b);
  } else {
    /* scan whole column */
    yl = 0;
    yu = GEN_HASHY_MASK;
  }
 
  for (int y = yl;; y = (y + GEN_HASHY_INC) & GEN_HASHY_MASK) {
    for (int x = xl;; x = (x + GEN_HASHX_INC) & GEN_HASHX_MASK) {
      const Vehicle *v = _vehicle_viewport_hash[x + y]; // already masked & 0xFFF
 
      while (v != nullptr) {
 
        if (!(v->vehstatus & VS_HIDDEN) &&
          l <= v->coord.right + xb &&
          t <= v->coord.bottom + yb &&
          r >= v->coord.left - xb &&
          b >= v->coord.top - yb)
        {
          /*
           * This vehicle can potentially be drawn as part of this viewport and
           * needs to be revalidated, as the sprite may not be correct.
           */
          if (v->sprite_cache.revalidate_before_draw) {
            VehicleSpriteSeq seq;
            v->GetImage(v->direction, EIT_ON_MAP, &seq);
 
            if (seq.IsValid() && v->sprite_cache.sprite_seq != seq) {
              v->sprite_cache.sprite_seq = seq;
              /*
               * A sprite change may also result in a bounding box change,
               * so we need to update the bounding box again before we
               * check to see if the vehicle should be drawn. Note that
               * we can't interfere with the viewport hash at this point,
               * so we keep the original hash on the assumption there will
               * not be a significant change in the top and left coordinates
               * of the vehicle.
               */
              v->UpdateBoundingBoxCoordinates(false);
 
            }
 
            v->sprite_cache.revalidate_before_draw = false;
          }
 
          if (l <= v->coord.right &&
            t <= v->coord.bottom &&
            r >= v->coord.left &&
            b >= v->coord.top) DoDrawVehicle(v);
        }
 
        v = v->hash_viewport_next;
      }
 
      if (x == xu) break;
    }
 
    if (y == yu) break;
  }
}
 
Vehicle *CheckClickOnVehicle(const Viewport *vp, int x, int y)
{
  Vehicle *found = nullptr;
  uint dist, best_dist = UINT_MAX;
 
  if ((uint)(x -= vp->left) >= (uint)vp->width || (uint)(y -= vp->top) >= (uint)vp->height) return nullptr;
 
  x = ScaleByZoom(x, vp->zoom) + vp->virtual_left;
  y = ScaleByZoom(y, vp->zoom) + vp->virtual_top;
 
  for (Vehicle *v : Vehicle::Iterate()) {
    if ((v->vehstatus & (VS_HIDDEN | VS_UNCLICKABLE)) == 0 &&
        x >= v->coord.left && x <= v->coord.right &&
        y >= v->coord.top && y <= v->coord.bottom) {
 
      dist = std::max(
        abs(((v->coord.left + v->coord.right) >> 1) - x),
        abs(((v->coord.top + v->coord.bottom) >> 1) - y)
      );
 
      if (dist < best_dist) {
        found = v;
        best_dist = dist;
      }
    }
  }
 
  return found;
}
 
void DecreaseVehicleValue(Vehicle *v)
{
  v->value -= v->value >> 8;
  SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
}
 
static const byte _breakdown_chance[64] = {
    3,   3,   3,   3,   3,   3,   3,   3,
    4,   4,   5,   5,   6,   6,   7,   7,
    8,   8,   9,   9,  10,  10,  11,  11,
   12,  13,  13,  13,  13,  14,  15,  16,
   17,  19,  21,  25,  28,  31,  34,  37,
   40,  44,  48,  52,  56,  60,  64,  68,
   72,  80,  90, 100, 110, 120, 130, 140,
  150, 170, 190, 210, 230, 250, 250, 250,
};
 
void CheckVehicleBreakdown(Vehicle *v)
{
  int rel, rel_old;
 
  /* decrease reliability */
  if (!_settings_game.order.no_servicing_if_no_breakdowns ||
      _settings_game.difficulty.vehicle_breakdowns != 0) {
    v->reliability = rel = std::max((rel_old = v->reliability) - v->reliability_spd_dec, 0);
    if ((rel_old >> 8) != (rel >> 8)) SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
  }
 
  if (v->breakdown_ctr != 0 || (v->vehstatus & VS_STOPPED) ||
      _settings_game.difficulty.vehicle_breakdowns < 1 ||
      v->cur_speed < 5 || _game_mode == GM_MENU) {
    return;
  }
 
  uint32 r = Random();
 
  /* increase chance of failure */
  int chance = v->breakdown_chance + 1;
  if (Chance16I(1, 25, r)) chance += 25;
  v->breakdown_chance = std::min(255, chance);
 
  /* calculate reliability value to use in comparison */
  rel = v->reliability;
  if (v->type == VEH_SHIP) rel += 0x6666;
 
  /* reduced breakdowns? */
  if (_settings_game.difficulty.vehicle_breakdowns == 1) rel += 0x6666;
 
  /* check if to break down */
  if (_breakdown_chance[(uint)std::min(rel, 0xffff) >> 10] <= v->breakdown_chance) {
    v->breakdown_ctr    = GB(r, 16, 6) + 0x3F;
    v->breakdown_delay  = GB(r, 24, 7) + 0x80;
    v->breakdown_chance = 0;
  }
}
 
bool Vehicle::HandleBreakdown()
{
  /* Possible states for Vehicle::breakdown_ctr
   * 0  - vehicle is running normally
   * 1  - vehicle is currently broken down
   * 2  - vehicle is going to break down now
   * >2 - vehicle is counting down to the actual breakdown event */
  switch (this->breakdown_ctr) {
    case 0:
      return false;
 
    case 2:
      this->breakdown_ctr = 1;
 
      if (this->breakdowns_since_last_service != 255) {
        this->breakdowns_since_last_service++;
      }
 
      if (this->type == VEH_AIRCRAFT) {
        /* Aircraft just need this flag, the rest is handled elsewhere */
        this->vehstatus |= VS_AIRCRAFT_BROKEN;
      } else {
        this->cur_speed = 0;
 
        if (!PlayVehicleSound(this, VSE_BREAKDOWN)) {
          bool train_or_ship = this->type == VEH_TRAIN || this->type == VEH_SHIP;
          SndPlayVehicleFx((_settings_game.game_creation.landscape != LT_TOYLAND) ?
            (train_or_ship ? SND_10_BREAKDOWN_TRAIN_SHIP : SND_0F_BREAKDOWN_ROADVEHICLE) :
            (train_or_ship ? SND_3A_BREAKDOWN_TRAIN_SHIP_TOYLAND : SND_35_BREAKDOWN_ROADVEHICLE_TOYLAND), this);
        }
 
        if (!(this->vehstatus & VS_HIDDEN) && !HasBit(EngInfo(this->engine_type)->misc_flags, EF_NO_BREAKDOWN_SMOKE)) {
          EffectVehicle *u = CreateEffectVehicleRel(this, 4, 4, 5, EV_BREAKDOWN_SMOKE);
          if (u != nullptr) u->animation_state = this->breakdown_delay * 2;
        }
      }
 
      this->MarkDirty(); // Update graphics after speed is zeroed
      SetWindowDirty(WC_VEHICLE_VIEW, this->index);
      SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
 
      FALLTHROUGH;
    case 1:
      /* Aircraft breakdowns end only when arriving at the airport */
      if (this->type == VEH_AIRCRAFT) return false;
 
      /* For trains this function is called twice per tick, so decrease v->breakdown_delay at half the rate */
      if ((this->tick_counter & (this->type == VEH_TRAIN ? 3 : 1)) == 0) {
        if (--this->breakdown_delay == 0) {
          this->breakdown_ctr = 0;
          this->MarkDirty();
          SetWindowDirty(WC_VEHICLE_VIEW, this->index);
        }
      }
      return true;
 
    default:
      if (!this->current_order.IsType(OT_LOADING)) this->breakdown_ctr--;
      return false;
  }
}
 
void AgeVehicle(Vehicle *v)
{
  if (v->age < MAX_DAY) {
    v->age++;
    if (v->IsPrimaryVehicle() && v->age == VEHICLE_PROFIT_MIN_AGE + 1) GroupStatistics::VehicleReachedProfitAge(v);
  }
 
  if (!v->IsPrimaryVehicle() && (v->type != VEH_TRAIN || !Train::From(v)->IsEngine())) return;
 
  int age = v->age - v->max_age;
  if (age == DAYS_IN_LEAP_YEAR * 0 || age == DAYS_IN_LEAP_YEAR * 1 ||
      age == DAYS_IN_LEAP_YEAR * 2 || age == DAYS_IN_LEAP_YEAR * 3 || age == DAYS_IN_LEAP_YEAR * 4) {
    v->reliability_spd_dec <<= 1;
  }
 
  SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
 
  /* Don't warn about non-primary or not ours vehicles or vehicles that are crashed */
  if (v->Previous() != nullptr || v->owner != _local_company || (v->vehstatus & VS_CRASHED) != 0) return;
 
  const Company *c = Company::Get(v->owner);
  /* Don't warn if a renew is active */
  if (c->settings.engine_renew && v->GetEngine()->company_avail != 0) return;
  /* Don't warn if a replacement is active */
  if (EngineHasReplacementForCompany(c, v->engine_type, v->group_id)) return;
 
  StringID str;
  if (age == -DAYS_IN_LEAP_YEAR) {
    str = STR_NEWS_VEHICLE_IS_GETTING_OLD;
  } else if (age == 0) {
    str = STR_NEWS_VEHICLE_IS_GETTING_VERY_OLD;
  } else if (age > 0 && (age % DAYS_IN_LEAP_YEAR) == 0) {
    str = STR_NEWS_VEHICLE_IS_GETTING_VERY_OLD_AND;
  } else {
    return;
  }
 
  SetDParam(0, v->index);
  AddVehicleAdviceNewsItem(str, v->index);
}
 
uint8 CalcPercentVehicleFilled(const Vehicle *front, StringID *colour)
{
  int count = 0;
  int max = 0;
  int cars = 0;
  int unloading = 0;
  bool loading = false;
 
  bool is_loading = front->current_order.IsType(OT_LOADING);
 
  /* The station may be nullptr when the (colour) string does not need to be set. */
  const Station *st = Station::GetIfValid(front->last_station_visited);
  assert(colour == nullptr || (st != nullptr && is_loading));
 
  bool order_no_load = is_loading && (front->current_order.GetLoadType() & OLFB_NO_LOAD);
  bool order_full_load = is_loading && (front->current_order.GetLoadType() & OLFB_FULL_LOAD);
 
  /* Count up max and used */
  for (const Vehicle *v = front; v != nullptr; v = v->Next()) {
    count += v->cargo.StoredCount();
    max += v->cargo_cap;
    if (v->cargo_cap != 0 && colour != nullptr) {
      unloading += HasBit(v->vehicle_flags, VF_CARGO_UNLOADING) ? 1 : 0;
      loading |= !order_no_load &&
          (order_full_load || st->goods[v->cargo_type].HasRating()) &&
          !HasBit(v->vehicle_flags, VF_LOADING_FINISHED) && !HasBit(v->vehicle_flags, VF_STOP_LOADING);
      cars++;
    }
  }
 
  if (colour != nullptr) {
    if (unloading == 0 && loading) {
      *colour = STR_PERCENT_UP;
    } else if (unloading == 0 && !loading) {
      *colour = STR_PERCENT_NONE;
    } else if (cars == unloading || !loading) {
      *colour = STR_PERCENT_DOWN;
    } else {
      *colour = STR_PERCENT_UP_DOWN;
    }
  }
 
  /* Train without capacity */
  if (max == 0) return 100;
 
  /* Return the percentage */
  if (count * 2 < max) {
    /* Less than 50%; round up, so that 0% means really empty. */
    return CeilDiv(count * 100, max);
  } else {
    /* More than 50%; round down, so that 100% means really full. */
    return (count * 100) / max;
  }
}
 
void VehicleEnterDepot(Vehicle *v)
{
  /* Always work with the front of the vehicle */
  assert(v == v->First());
 
  switch (v->type) {
    case VEH_TRAIN: {
      Train *t = Train::From(v);
      SetWindowClassesDirty(WC_TRAINS_LIST);
      /* Clear path reservation */
      SetDepotReservation(t->tile, false);
      if (_settings_client.gui.show_track_reservation) MarkTileDirtyByTile(t->tile);
 
      UpdateSignalsOnSegment(t->tile, INVALID_DIAGDIR, t->owner);
      t->wait_counter = 0;
      t->force_proceed = TFP_NONE;
      ClrBit(t->flags, VRF_TOGGLE_REVERSE);
      t->ConsistChanged(CCF_ARRANGE);
      break;
    }
 
    case VEH_ROAD:
      SetWindowClassesDirty(WC_ROADVEH_LIST);
      break;
 
    case VEH_SHIP: {
      SetWindowClassesDirty(WC_SHIPS_LIST);
      Ship *ship = Ship::From(v);
      ship->state = TRACK_BIT_DEPOT;
      ship->UpdateCache();
      ship->UpdateViewport(true, true);
      SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
      break;
    }
 
    case VEH_AIRCRAFT:
      SetWindowClassesDirty(WC_AIRCRAFT_LIST);
      HandleAircraftEnterHangar(Aircraft::From(v));
      break;
    default: NOT_REACHED();
  }
  SetWindowDirty(WC_VEHICLE_VIEW, v->index);
 
  if (v->type != VEH_TRAIN) {
    /* Trains update the vehicle list when the first unit enters the depot and calls VehicleEnterDepot() when the last unit enters.
     * We only increase the number of vehicles when the first one enters, so we will not need to search for more vehicles in the depot */
    InvalidateWindowData(WC_VEHICLE_DEPOT, v->tile);
  }
  SetWindowDirty(WC_VEHICLE_DEPOT, v->tile);
 
  v->vehstatus |= VS_HIDDEN;
  v->cur_speed = 0;
 
  VehicleServiceInDepot(v);
 
  /* After a vehicle trigger, the graphics and properties of the vehicle could change. */
  TriggerVehicle(v, VEHICLE_TRIGGER_DEPOT);
  v->MarkDirty();
 
  InvalidateWindowData(WC_VEHICLE_VIEW, v->index);
 
  if (v->current_order.IsType(OT_GOTO_DEPOT)) {
    SetWindowDirty(WC_VEHICLE_VIEW, v->index);
 
    const Order *real_order = v->GetOrder(v->cur_real_order_index);
 
    /* Test whether we are heading for this depot. If not, do nothing.
     * Note: The target depot for nearest-/manual-depot-orders is only updated on junctions, but we want to accept every depot. */
    if ((v->current_order.GetDepotOrderType() & ODTFB_PART_OF_ORDERS) &&
        real_order != nullptr && !(real_order->GetDepotActionType() & ODATFB_NEAREST_DEPOT) &&
        (v->type == VEH_AIRCRAFT ? v->current_order.GetDestination() != GetStationIndex(v->tile) : v->dest_tile != v->tile)) {
      /* We are heading for another depot, keep driving. */
      return;
    }
 
    if (v->current_order.IsRefit()) {
      Backup<CompanyID> cur_company(_current_company, v->owner, FILE_LINE);
      CommandCost cost = DoCommand(v->tile, v->index, v->current_order.GetRefitCargo() | 0xFF << 8, DC_EXEC, GetCmdRefitVeh(v));
      cur_company.Restore();
 
      if (cost.Failed()) {
        _vehicles_to_autoreplace[v] = false;
        if (v->owner == _local_company) {
          /* Notify the user that we stopped the vehicle */
          SetDParam(0, v->index);
          AddVehicleAdviceNewsItem(STR_NEWS_ORDER_REFIT_FAILED, v->index);
        }
      } else if (cost.GetCost() != 0) {
        v->profit_this_year -= cost.GetCost() << 8;
        if (v->owner == _local_company) {
          ShowCostOrIncomeAnimation(v->x_pos, v->y_pos, v->z_pos, cost.GetCost());
        }
      }
    }
 
    if (v->current_order.GetDepotOrderType() & ODTFB_PART_OF_ORDERS) {
      /* Part of orders */
      v->DeleteUnreachedImplicitOrders();
      UpdateVehicleTimetable(v, true);
      v->IncrementImplicitOrderIndex();
    }
    if (v->current_order.GetDepotActionType() & ODATFB_HALT) {
      /* Vehicles are always stopped on entering depots. Do not restart this one. */
      _vehicles_to_autoreplace[v] = false;
      /* Invalidate last_loading_station. As the link from the station
       * before the stop to the station after the stop can't be predicted
       * we shouldn't construct it when the vehicle visits the next stop. */
      v->last_loading_station = INVALID_STATION;
      if (v->owner == _local_company) {
        SetDParam(0, v->index);
        AddVehicleAdviceNewsItem(STR_NEWS_TRAIN_IS_WAITING + v->type, v->index);
      }
      AI::NewEvent(v->owner, new ScriptEventVehicleWaitingInDepot(v->index));
    }
    v->current_order.MakeDummy();
  }
}
 
 
void Vehicle::UpdatePosition()
{
  UpdateVehicleTileHash(this, false);
}
 
void Vehicle::UpdateBoundingBoxCoordinates(bool update_cache) const
{
  Rect new_coord;
  this->sprite_cache.sprite_seq.GetBounds(&new_coord);
 
  Point pt = RemapCoords(this->x_pos + this->x_offs, this->y_pos + this->y_offs, this->z_pos);
  new_coord.left   += pt.x;
  new_coord.top    += pt.y;
  new_coord.right  += pt.x + 2 * ZOOM_LVL_BASE;
  new_coord.bottom += pt.y + 2 * ZOOM_LVL_BASE;
 
  if (update_cache) {
    /*
     * If the old coordinates are invalid, set the cache to the new coordinates for correct
     * behaviour the next time the coordinate cache is checked.
     */
    this->sprite_cache.old_coord = this->coord.left == INVALID_COORD ? new_coord : this->coord;
  }
  else {
    /* Extend the bounds of the existing cached bounding box so the next dirty window is correct */
    this->sprite_cache.old_coord.left   = std::min(this->sprite_cache.old_coord.left,   this->coord.left);
    this->sprite_cache.old_coord.top    = std::min(this->sprite_cache.old_coord.top,    this->coord.top);
    this->sprite_cache.old_coord.right  = std::max(this->sprite_cache.old_coord.right,  this->coord.right);
    this->sprite_cache.old_coord.bottom = std::max(this->sprite_cache.old_coord.bottom, this->coord.bottom);
  }
 
  this->coord = new_coord;
}
 
void Vehicle::UpdateViewport(bool dirty)
{
  /* If the existing cache is invalid we should ignore it, as it will be set to the current coords by UpdateBoundingBoxCoordinates */
  bool ignore_cached_coords = this->sprite_cache.old_coord.left == INVALID_COORD;
 
  this->UpdateBoundingBoxCoordinates(true);
 
  if (ignore_cached_coords) {
    UpdateVehicleViewportHash(this, this->coord.left, this->coord.top, INVALID_COORD, INVALID_COORD);
  } else {
    UpdateVehicleViewportHash(this, this->coord.left, this->coord.top, this->sprite_cache.old_coord.left, this->sprite_cache.old_coord.top);
  }
 
  if (dirty) {
    if (ignore_cached_coords) {
      this->sprite_cache.is_viewport_candidate = this->MarkAllViewportsDirty();
    } else {
      this->sprite_cache.is_viewport_candidate = ::MarkAllViewportsDirty(
        std::min(this->sprite_cache.old_coord.left, this->coord.left),
        std::min(this->sprite_cache.old_coord.top, this->coord.top),
        std::max(this->sprite_cache.old_coord.right, this->coord.right),
        std::max(this->sprite_cache.old_coord.bottom, this->coord.bottom));
    }
  }
}
 
void Vehicle::UpdatePositionAndViewport()
{
  this->UpdatePosition();
  this->UpdateViewport(true);
}
 
bool Vehicle::MarkAllViewportsDirty() const
{
  return ::MarkAllViewportsDirty(this->coord.left, this->coord.top, this->coord.right, this->coord.bottom);
}
 
GetNewVehiclePosResult GetNewVehiclePos(const Vehicle *v)
{
  static const int8 _delta_coord[16] = {
    -1,-1,-1, 0, 1, 1, 1, 0, /* x */
    -1, 0, 1, 1, 1, 0,-1,-1, /* y */
  };
 
  int x = v->x_pos + _delta_coord[v->direction];
  int y = v->y_pos + _delta_coord[v->direction + 8];
 
  GetNewVehiclePosResult gp;
  gp.x = x;
  gp.y = y;
  gp.old_tile = v->tile;
  gp.new_tile = TileVirtXY(x, y);
  return gp;
}
 
static const Direction _new_direction_table[] = {
  DIR_N,  DIR_NW, DIR_W,
  DIR_NE, DIR_SE, DIR_SW,
  DIR_E,  DIR_SE, DIR_S
};
 
Direction GetDirectionTowards(const Vehicle *v, int x, int y)
{
  int i = 0;
 
  if (y >= v->y_pos) {
    if (y != v->y_pos) i += 3;
    i += 3;
  }
 
  if (x >= v->x_pos) {
    if (x != v->x_pos) i++;
    i++;
  }
 
  Direction dir = v->direction;
 
  DirDiff dirdiff = DirDifference(_new_direction_table[i], dir);
  if (dirdiff == DIRDIFF_SAME) return dir;
  return ChangeDir(dir, dirdiff > DIRDIFF_REVERSE ? DIRDIFF_45LEFT : DIRDIFF_45RIGHT);
}
 
VehicleEnterTileStatus VehicleEnterTile(Vehicle *v, TileIndex tile, int x, int y)
{
  return _tile_type_procs[GetTileType(tile)]->vehicle_enter_tile_proc(v, tile, x, y);
}
 
FreeUnitIDGenerator::FreeUnitIDGenerator(VehicleType type, CompanyID owner) : cache(nullptr), maxid(0), curid(0)
{
  /* Find maximum */
  for (const Vehicle *v : Vehicle::Iterate()) {
    if (v->type == type && v->owner == owner) {
      this->maxid = std::max<UnitID>(this->maxid, v->unitnumber);
    }
  }
 
  if (this->maxid == 0) return;
 
  /* Reserving 'maxid + 2' because we need:
   * - space for the last item (with v->unitnumber == maxid)
   * - one free slot working as loop terminator in FreeUnitIDGenerator::NextID() */
  this->cache = CallocT<bool>(this->maxid + 2);
 
  /* Fill the cache */
  for (const Vehicle *v : Vehicle::Iterate()) {
    if (v->type == type && v->owner == owner) {
      this->cache[v->unitnumber] = true;
    }
  }
}
 
UnitID FreeUnitIDGenerator::NextID()
{
  if (this->maxid <= this->curid) return ++this->curid;
 
  while (this->cache[++this->curid]) { } // it will stop, we reserved more space than needed
 
  return this->curid;
}
 
UnitID GetFreeUnitNumber(VehicleType type)
{
  /* Check whether it is allowed to build another vehicle. */
  uint max_veh;
  switch (type) {
    case VEH_TRAIN:    max_veh = _settings_game.vehicle.max_trains;   break;
    case VEH_ROAD:     max_veh = _settings_game.vehicle.max_roadveh;  break;
    case VEH_SHIP:     max_veh = _settings_game.vehicle.max_ships;    break;
    case VEH_AIRCRAFT: max_veh = _settings_game.vehicle.max_aircraft; break;
    default: NOT_REACHED();
  }
 
  const Company *c = Company::Get(_current_company);
  if (c->group_all[type].num_vehicle >= max_veh) return UINT16_MAX; // Currently already at the limit, no room to make a new one.
 
  FreeUnitIDGenerator gen(type, _current_company);
 
  return gen.NextID();
}
 
 
bool CanBuildVehicleInfrastructure(VehicleType type, byte subtype)
{
  assert(IsCompanyBuildableVehicleType(type));
 
  if (!Company::IsValidID(_local_company)) return false;
 
  UnitID max;
  switch (type) {
    case VEH_TRAIN:
      if (!HasAnyRailtypesAvail(_local_company)) return false;
      max = _settings_game.vehicle.max_trains;
      break;
    case VEH_ROAD:
      if (!HasAnyRoadTypesAvail(_local_company, (RoadTramType)subtype)) return false;
      max = _settings_game.vehicle.max_roadveh;
      break;
    case VEH_SHIP:     max = _settings_game.vehicle.max_ships; break;
    case VEH_AIRCRAFT: max = _settings_game.vehicle.max_aircraft; break;
    default: NOT_REACHED();
  }
 
  /* We can build vehicle infrastructure when we may build the vehicle type */
  if (max > 0) {
    /* Can we actually build the vehicle type? */
    for (const Engine *e : Engine::IterateType(type)) {
      if (type == VEH_ROAD && GetRoadTramType(e->u.road.roadtype) != (RoadTramType)subtype) continue;
      if (HasBit(e->company_avail, _local_company)) return true;
    }
    return false;
  }
 
  /* We should be able to build infrastructure when we have the actual vehicle type */
  for (const Vehicle *v : Vehicle::Iterate()) {
    if (v->type == VEH_ROAD && GetRoadTramType(RoadVehicle::From(v)->roadtype) != (RoadTramType)subtype) continue;
    if (v->owner == _local_company && v->type == type) return true;
  }
 
  return false;
}
 
 
LiveryScheme GetEngineLiveryScheme(EngineID engine_type, EngineID parent_engine_type, const Vehicle *v)
{
  CargoID cargo_type = v == nullptr ? (CargoID)CT_INVALID : v->cargo_type;
  const Engine *e = Engine::Get(engine_type);
  switch (e->type) {
    default: NOT_REACHED();
    case VEH_TRAIN:
      if (v != nullptr && parent_engine_type != INVALID_ENGINE && (UsesWagonOverride(v) || (v->IsArticulatedPart() && e->u.rail.railveh_type != RAILVEH_WAGON))) {
        /* Wagonoverrides use the colour scheme of the front engine.
         * Articulated parts use the colour scheme of the first part. (Not supported for articulated wagons) */
        engine_type = parent_engine_type;
        e = Engine::Get(engine_type);
        /* Note: Luckily cargo_type is not needed for engines */
      }
 
      if (cargo_type == CT_INVALID) cargo_type = e->GetDefaultCargoType();
      if (cargo_type == CT_INVALID) cargo_type = CT_GOODS; // The vehicle does not carry anything, let's pick some freight cargo
      if (e->u.rail.railveh_type == RAILVEH_WAGON) {
        if (!CargoSpec::Get(cargo_type)->is_freight) {
          if (parent_engine_type == INVALID_ENGINE) {
            return LS_PASSENGER_WAGON_STEAM;
          } else {
            bool is_mu = HasBit(EngInfo(parent_engine_type)->misc_flags, EF_RAIL_IS_MU);
            switch (RailVehInfo(parent_engine_type)->engclass) {
              default: NOT_REACHED();
              case EC_STEAM:    return LS_PASSENGER_WAGON_STEAM;
              case EC_DIESEL:   return is_mu ? LS_DMU : LS_PASSENGER_WAGON_DIESEL;
              case EC_ELECTRIC: return is_mu ? LS_EMU : LS_PASSENGER_WAGON_ELECTRIC;
              case EC_MONORAIL: return LS_PASSENGER_WAGON_MONORAIL;
              case EC_MAGLEV:   return LS_PASSENGER_WAGON_MAGLEV;
            }
          }
        } else {
          return LS_FREIGHT_WAGON;
        }
      } else {
        bool is_mu = HasBit(e->info.misc_flags, EF_RAIL_IS_MU);
 
        switch (e->u.rail.engclass) {
          default: NOT_REACHED();
          case EC_STEAM:    return LS_STEAM;
          case EC_DIESEL:   return is_mu ? LS_DMU : LS_DIESEL;
          case EC_ELECTRIC: return is_mu ? LS_EMU : LS_ELECTRIC;
          case EC_MONORAIL: return LS_MONORAIL;
          case EC_MAGLEV:   return LS_MAGLEV;
        }
      }
 
    case VEH_ROAD:
      /* Always use the livery of the front */
      if (v != nullptr && parent_engine_type != INVALID_ENGINE) {
        engine_type = parent_engine_type;
        e = Engine::Get(engine_type);
        cargo_type = v->First()->cargo_type;
      }
      if (cargo_type == CT_INVALID) cargo_type = e->GetDefaultCargoType();
      if (cargo_type == CT_INVALID) cargo_type = CT_GOODS; // The vehicle does not carry anything, let's pick some freight cargo
 
      /* Important: Use Tram Flag of front part. Luckily engine_type refers to the front part here. */
      if (HasBit(e->info.misc_flags, EF_ROAD_TRAM)) {
        /* Tram */
        return IsCargoInClass(cargo_type, CC_PASSENGERS) ? LS_PASSENGER_TRAM : LS_FREIGHT_TRAM;
      } else {
        /* Bus or truck */
        return IsCargoInClass(cargo_type, CC_PASSENGERS) ? LS_BUS : LS_TRUCK;
      }
 
    case VEH_SHIP:
      if (cargo_type == CT_INVALID) cargo_type = e->GetDefaultCargoType();
      if (cargo_type == CT_INVALID) cargo_type = CT_GOODS; // The vehicle does not carry anything, let's pick some freight cargo
      return IsCargoInClass(cargo_type, CC_PASSENGERS) ? LS_PASSENGER_SHIP : LS_FREIGHT_SHIP;
 
    case VEH_AIRCRAFT:
      switch (e->u.air.subtype) {
        case AIR_HELI: return LS_HELICOPTER;
        case AIR_CTOL: return LS_SMALL_PLANE;
        case AIR_CTOL | AIR_FAST: return LS_LARGE_PLANE;
        default: NOT_REACHED();
      }
  }
}
 
const Livery *GetEngineLivery(EngineID engine_type, CompanyID company, EngineID parent_engine_type, const Vehicle *v, byte livery_setting)
{
  const Company *c = Company::Get(company);
  LiveryScheme scheme = LS_DEFAULT;
 
  if (livery_setting == LIT_ALL || (livery_setting == LIT_COMPANY && company == _local_company)) {
    if (v != nullptr) {
      const Group *g = Group::GetIfValid(v->First()->group_id);
      if (g != nullptr) {
        /* Traverse parents until we find a livery or reach the top */
        while (g->livery.in_use == 0 && g->parent != INVALID_GROUP) {
          g = Group::Get(g->parent);
        }
        if (g->livery.in_use != 0) return &g->livery;
      }
    }
 
    /* The default livery is always available for use, but its in_use flag determines
     * whether any _other_ liveries are in use. */
    if (c->livery[LS_DEFAULT].in_use != 0) {
      /* Determine the livery scheme to use */
      scheme = GetEngineLiveryScheme(engine_type, parent_engine_type, v);
    }
  }
 
  return &c->livery[scheme];
}
 
 
static PaletteID GetEngineColourMap(EngineID engine_type, CompanyID company, EngineID parent_engine_type, const Vehicle *v)
{
  PaletteID map = (v != nullptr) ? v->colourmap : PAL_NONE;
 
  /* Return cached value if any */
  if (map != PAL_NONE) return map;
 
  const Engine *e = Engine::Get(engine_type);
 
  /* Check if we should use the colour map callback */
  if (HasBit(e->info.callback_mask, CBM_VEHICLE_COLOUR_REMAP)) {
    uint16 callback = GetVehicleCallback(CBID_VEHICLE_COLOUR_MAPPING, 0, 0, engine_type, v);
    /* Failure means "use the default two-colour" */
    if (callback != CALLBACK_FAILED) {
      static_assert(PAL_NONE == 0); // Returning 0x4000 (resp. 0xC000) coincidences with default value (PAL_NONE)
      map = GB(callback, 0, 14);
      /* If bit 14 is set, then the company colours are applied to the
       * map else it's returned as-is. */
      if (!HasBit(callback, 14)) {
        /* Update cache */
        if (v != nullptr) const_cast<Vehicle *>(v)->colourmap = map;
        return map;
      }
    }
  }
 
  bool twocc = HasBit(e->info.misc_flags, EF_USES_2CC);
 
  if (map == PAL_NONE) map = twocc ? (PaletteID)SPR_2CCMAP_BASE : (PaletteID)PALETTE_RECOLOUR_START;
 
  /* Spectator has news shown too, but has invalid company ID - as well as dedicated server */
  if (!Company::IsValidID(company)) return map;
 
  const Livery *livery = GetEngineLivery(engine_type, company, parent_engine_type, v, _settings_client.gui.liveries);
 
  map += livery->colour1;
  if (twocc) map += livery->colour2 * 16;
 
  /* Update cache */
  if (v != nullptr) const_cast<Vehicle *>(v)->colourmap = map;
  return map;
}
 
PaletteID GetEnginePalette(EngineID engine_type, CompanyID company)
{
  return GetEngineColourMap(engine_type, company, INVALID_ENGINE, nullptr);
}
 
PaletteID GetVehiclePalette(const Vehicle *v)
{
  if (v->IsGroundVehicle()) {
    return GetEngineColourMap(v->engine_type, v->owner, v->GetGroundVehicleCache()->first_engine, v);
  }
 
  return GetEngineColourMap(v->engine_type, v->owner, INVALID_ENGINE, v);
}
 
void Vehicle::DeleteUnreachedImplicitOrders()
{
  if (this->IsGroundVehicle()) {
    uint16 &gv_flags = this->GetGroundVehicleFlags();
    if (HasBit(gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS)) {
      /* Do not delete orders, only skip them */
      ClrBit(gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS);
      this->cur_implicit_order_index = this->cur_real_order_index;
      InvalidateVehicleOrder(this, 0);
      return;
    }
  }
 
  const Order *order = this->GetOrder(this->cur_implicit_order_index);
  while (order != nullptr) {
    if (this->cur_implicit_order_index == this->cur_real_order_index) break;
 
    if (order->IsType(OT_IMPLICIT)) {
      DeleteOrder(this, this->cur_implicit_order_index);
      /* DeleteOrder does various magic with order_indices, so resync 'order' with 'cur_implicit_order_index' */
      order = this->GetOrder(this->cur_implicit_order_index);
    } else {
      /* Skip non-implicit orders, e.g. service-orders */
      order = order->next;
      this->cur_implicit_order_index++;
    }
 
    /* Wrap around */
    if (order == nullptr) {
      order = this->GetOrder(0);
      this->cur_implicit_order_index = 0;
    }
  }
}
 
void Vehicle::BeginLoading()
{
  assert(IsTileType(this->tile, MP_STATION) || this->type == VEH_SHIP);
 
  uint32 travel_time = this->current_order_time;
  if (this->current_order.IsType(OT_GOTO_STATION) &&
      this->current_order.GetDestination() == this->last_station_visited) {
    this->DeleteUnreachedImplicitOrders();
 
    /* Now both order indices point to the destination station, and we can start loading */
    this->current_order.MakeLoading(true);
    UpdateVehicleTimetable(this, true);
 
    /* Furthermore add the Non Stop flag to mark that this station
     * is the actual destination of the vehicle, which is (for example)
     * necessary to be known for HandleTrainLoading to determine
     * whether the train is lost or not; not marking a train lost
     * that arrives at random stations is bad. */
    this->current_order.SetNonStopType(ONSF_NO_STOP_AT_ANY_STATION);
 
  } else {
    /* We weren't scheduled to stop here. Insert an implicit order
     * to show that we are stopping here.
     * While only groundvehicles have implicit orders, e.g. aircraft might still enter
     * the 'wrong' terminal when skipping orders etc. */
    Order *in_list = this->GetOrder(this->cur_implicit_order_index);
    if (this->IsGroundVehicle() &&
        (in_list == nullptr || !in_list->IsType(OT_IMPLICIT) ||
        in_list->GetDestination() != this->last_station_visited)) {
      bool suppress_implicit_orders = HasBit(this->GetGroundVehicleFlags(), GVF_SUPPRESS_IMPLICIT_ORDERS);
      /* Do not create consecutive duplicates of implicit orders */
      Order *prev_order = this->cur_implicit_order_index > 0 ? this->GetOrder(this->cur_implicit_order_index - 1) : (this->GetNumOrders() > 1 ? this->GetLastOrder() : nullptr);
      if (prev_order == nullptr ||
          (!prev_order->IsType(OT_IMPLICIT) && !prev_order->IsType(OT_GOTO_STATION)) ||
          prev_order->GetDestination() != this->last_station_visited) {
 
        /* Prefer deleting implicit orders instead of inserting new ones,
         * so test whether the right order follows later. In case of only
         * implicit orders treat the last order in the list like an
         * explicit one, except if the overall number of orders surpasses
         * IMPLICIT_ORDER_ONLY_CAP. */
        int target_index = this->cur_implicit_order_index;
        bool found = false;
        while (target_index != this->cur_real_order_index || this->GetNumManualOrders() == 0) {
          const Order *order = this->GetOrder(target_index);
          if (order == nullptr) break; // No orders.
          if (order->IsType(OT_IMPLICIT) && order->GetDestination() == this->last_station_visited) {
            found = true;
            break;
          }
          target_index++;
          if (target_index >= this->orders.list->GetNumOrders()) {
            if (this->GetNumManualOrders() == 0 &&
                this->GetNumOrders() < IMPLICIT_ORDER_ONLY_CAP) {
              break;
            }
            target_index = 0;
          }
          if (target_index == this->cur_implicit_order_index) break; // Avoid infinite loop.
        }
 
        if (found) {
          if (suppress_implicit_orders) {
            /* Skip to the found order */
            this->cur_implicit_order_index = target_index;
            InvalidateVehicleOrder(this, 0);
          } else {
            /* Delete all implicit orders up to the station we just reached */
            const Order *order = this->GetOrder(this->cur_implicit_order_index);
            while (!order->IsType(OT_IMPLICIT) || order->GetDestination() != this->last_station_visited) {
              if (order->IsType(OT_IMPLICIT)) {
                DeleteOrder(this, this->cur_implicit_order_index);
                /* DeleteOrder does various magic with order_indices, so resync 'order' with 'cur_implicit_order_index' */
                order = this->GetOrder(this->cur_implicit_order_index);
              } else {
                /* Skip non-implicit orders, e.g. service-orders */
                order = order->next;
                this->cur_implicit_order_index++;
              }
 
              /* Wrap around */
              if (order == nullptr) {
                order = this->GetOrder(0);
                this->cur_implicit_order_index = 0;
              }
              assert(order != nullptr);
            }
          }
        } else if (!suppress_implicit_orders &&
            ((this->orders.list == nullptr ? OrderList::CanAllocateItem() : this->orders.list->GetNumOrders() < MAX_VEH_ORDER_ID)) &&
            Order::CanAllocateItem()) {
          /* Insert new implicit order */
          Order *implicit_order = new Order();
          implicit_order->MakeImplicit(this->last_station_visited);
          InsertOrder(this, implicit_order, this->cur_implicit_order_index);
          if (this->cur_implicit_order_index > 0) --this->cur_implicit_order_index;
 
          /* InsertOrder disabled creation of implicit orders for all vehicles with the same implicit order.
           * Reenable it for this vehicle */
          uint16 &gv_flags = this->GetGroundVehicleFlags();
          ClrBit(gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS);
        }
      }
    }
    this->current_order.MakeLoading(false);
  }
 
  if (this->last_loading_station != INVALID_STATION &&
      this->last_loading_station != this->last_station_visited &&
      ((this->current_order.GetLoadType() & OLFB_NO_LOAD) == 0 ||
      (this->current_order.GetUnloadType() & OUFB_NO_UNLOAD) == 0)) {
    IncreaseStats(Station::Get(this->last_loading_station), this, this->last_station_visited, travel_time);
  }
 
  PrepareUnload(this);
 
  SetWindowDirty(GetWindowClassForVehicleType(this->type), this->owner);
  SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
  SetWindowDirty(WC_VEHICLE_DETAILS, this->index);
  SetWindowDirty(WC_STATION_VIEW, this->last_station_visited);
 
  Station::Get(this->last_station_visited)->MarkTilesDirty(true);
  this->cur_speed = 0;
  this->MarkDirty();
}
 
void Vehicle::CancelReservation(StationID next, Station *st)
{
  for (Vehicle *v = this; v != nullptr; v = v->next) {
    VehicleCargoList &cargo = v->cargo;
    if (cargo.ActionCount(VehicleCargoList::MTA_LOAD) > 0) {
      Debug(misc, 1, "cancelling cargo reservation");
      cargo.Return(UINT_MAX, &st->goods[v->cargo_type].cargo, next);
      cargo.SetTransferLoadPlace(st->xy);
    }
    cargo.KeepAll();
  }
}
 
void Vehicle::LeaveStation()
{
  assert(this->current_order.IsType(OT_LOADING));
 
  delete this->cargo_payment;
  assert(this->cargo_payment == nullptr); // cleared by ~CargoPayment
 
  /* Only update the timetable if the vehicle was supposed to stop here. */
  if (this->current_order.GetNonStopType() != ONSF_STOP_EVERYWHERE) UpdateVehicleTimetable(this, false);
 
  if ((this->current_order.GetLoadType() & OLFB_NO_LOAD) == 0 ||
      (this->current_order.GetUnloadType() & OUFB_NO_UNLOAD) == 0) {
    if (this->current_order.CanLeaveWithCargo(this->last_loading_station != INVALID_STATION)) {
      /* Refresh next hop stats to make sure we've done that at least once
       * during the stop and that refit_cap == cargo_cap for each vehicle in
       * the consist. */
      this->ResetRefitCaps();
      LinkRefresher::Run(this);
 
      /* if the vehicle could load here or could stop with cargo loaded set the last loading station */
      this->last_loading_station = this->last_station_visited;
    } else {
      /* if the vehicle couldn't load and had to unload or transfer everything
       * set the last loading station to invalid as it will leave empty. */
      this->last_loading_station = INVALID_STATION;
    }
  }
 
  this->current_order.MakeLeaveStation();
  Station *st = Station::Get(this->last_station_visited);
  this->CancelReservation(INVALID_STATION, st);
  st->loading_vehicles.remove(this);
 
  HideFillingPercent(&this->fill_percent_te_id);
  trip_occupancy = CalcPercentVehicleFilled(this, nullptr);
 
  if (this->type == VEH_TRAIN && !(this->vehstatus & VS_CRASHED)) {
    /* Trigger station animation (trains only) */
    if (IsTileType(this->tile, MP_STATION)) {
      TriggerStationRandomisation(st, this->tile, SRT_TRAIN_DEPARTS);
      TriggerStationAnimation(st, this->tile, SAT_TRAIN_DEPARTS);
    }
 
    SetBit(Train::From(this)->flags, VRF_LEAVING_STATION);
  }
 
  this->MarkDirty();
}
 
void Vehicle::ResetRefitCaps()
{
  for (Vehicle *v = this; v != nullptr; v = v->Next()) v->refit_cap = v->cargo_cap;
}
 
void Vehicle::HandleLoading(bool mode)
{
  switch (this->current_order.GetType()) {
    case OT_LOADING: {
      uint wait_time = std::max(this->current_order.GetTimetabledWait() - this->lateness_counter, 0);
 
      /* Not the first call for this tick, or still loading */
      if (mode || !HasBit(this->vehicle_flags, VF_LOADING_FINISHED) || this->current_order_time < wait_time) return;
 
      this->PlayLeaveStationSound();
 
      this->LeaveStation();
 
      /* Only advance to next order if we just loaded at the current one */
      const Order *order = this->GetOrder(this->cur_implicit_order_index);
      if (order == nullptr ||
          (!order->IsType(OT_IMPLICIT) && !order->IsType(OT_GOTO_STATION)) ||
          order->GetDestination() != this->last_station_visited) {
        return;
      }
      break;
    }
 
    case OT_DUMMY: break;
 
    default: return;
  }
 
  this->IncrementImplicitOrderIndex();
}
 
void Vehicle::GetConsistFreeCapacities(SmallMap<CargoID, uint> &capacities) const
{
  for (const Vehicle *v = this; v != nullptr; v = v->Next()) {
    if (v->cargo_cap == 0) continue;
    std::pair<CargoID, uint> *pair = capacities.Find(v->cargo_type);
    if (pair == capacities.End()) {
      capacities.push_back({v->cargo_type, v->cargo_cap - v->cargo.StoredCount()});
    } else {
      pair->second += v->cargo_cap - v->cargo.StoredCount();
    }
  }
}
 
uint Vehicle::GetConsistTotalCapacity() const
{
  uint result = 0;
  for (const Vehicle *v = this; v != nullptr; v = v->Next()) {
    result += v->cargo_cap;
  }
  return result;
}
 
CommandCost Vehicle::SendToDepot(DoCommandFlag flags, DepotCommand command)
{
  CommandCost ret = CheckOwnership(this->owner);
  if (ret.Failed()) return ret;
 
  if (this->vehstatus & VS_CRASHED) return CMD_ERROR;
  if (this->IsStoppedInDepot()) return CMD_ERROR;
 
  if (this->current_order.IsType(OT_GOTO_DEPOT)) {
    bool halt_in_depot = (this->current_order.GetDepotActionType() & ODATFB_HALT) != 0;
    if (!!(command & DEPOT_SERVICE) == halt_in_depot) {
      /* We called with a different DEPOT_SERVICE setting.
       * Now we change the setting to apply the new one and let the vehicle head for the same depot.
       * Note: the if is (true for requesting service == true for ordered to stop in depot)          */
      if (flags & DC_EXEC) {
        this->current_order.SetDepotOrderType(ODTF_MANUAL);
        this->current_order.SetDepotActionType(halt_in_depot ? ODATF_SERVICE_ONLY : ODATFB_HALT);
        SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
      }
      return CommandCost();
    }
 
    if (command & DEPOT_DONT_CANCEL) return CMD_ERROR; // Requested no cancellation of depot orders
    if (flags & DC_EXEC) {
      /* If the orders to 'goto depot' are in the orders list (forced servicing),
       * then skip to the next order; effectively cancelling this forced service */
      if (this->current_order.GetDepotOrderType() & ODTFB_PART_OF_ORDERS) this->IncrementRealOrderIndex();
 
      if (this->IsGroundVehicle()) {
        uint16 &gv_flags = this->GetGroundVehicleFlags();
        SetBit(gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS);
      }
 
      this->current_order.MakeDummy();
      SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
    }
    return CommandCost();
  }
 
  TileIndex location;
  DestinationID destination;
  bool reverse;
  static const StringID no_depot[] = {STR_ERROR_UNABLE_TO_FIND_ROUTE_TO, STR_ERROR_UNABLE_TO_FIND_LOCAL_DEPOT, STR_ERROR_UNABLE_TO_FIND_LOCAL_DEPOT, STR_ERROR_CAN_T_SEND_AIRCRAFT_TO_HANGAR};
  if (!this->FindClosestDepot(&location, &destination, &reverse)) return_cmd_error(no_depot[this->type]);
 
  if (flags & DC_EXEC) {
    if (this->current_order.IsType(OT_LOADING)) this->LeaveStation();
 
    if (this->IsGroundVehicle() && this->GetNumManualOrders() > 0) {
      uint16 &gv_flags = this->GetGroundVehicleFlags();
      SetBit(gv_flags, GVF_SUPPRESS_IMPLICIT_ORDERS);
    }
 
    this->SetDestTile(location);
    this->current_order.MakeGoToDepot(destination, ODTF_MANUAL);
    if (!(command & DEPOT_SERVICE)) this->current_order.SetDepotActionType(ODATFB_HALT);
    SetWindowWidgetDirty(WC_VEHICLE_VIEW, this->index, WID_VV_START_STOP);
 
    /* If there is no depot in front and the train is not already reversing, reverse automatically (trains only) */
    if (this->type == VEH_TRAIN && (reverse ^ HasBit(Train::From(this)->flags, VRF_REVERSING))) {
      DoCommand(this->tile, this->index, 0, DC_EXEC, CMD_REVERSE_TRAIN_DIRECTION);
    }
 
    if (this->type == VEH_AIRCRAFT) {
      Aircraft *a = Aircraft::From(this);
      if (a->state == FLYING && a->targetairport != destination) {
        /* The aircraft is now heading for a different hangar than the next in the orders */
        extern void AircraftNextAirportPos_and_Order(Aircraft *a);
        AircraftNextAirportPos_and_Order(a);
      }
    }
  }
 
  return CommandCost();
 
}
 
void Vehicle::UpdateVisualEffect(bool allow_power_change)
{
  bool powered_before = HasBit(this->vcache.cached_vis_effect, VE_DISABLE_WAGON_POWER);
  const Engine *e = this->GetEngine();
 
  /* Evaluate properties */
  byte visual_effect;
  switch (e->type) {
    case VEH_TRAIN: visual_effect = e->u.rail.visual_effect; break;
    case VEH_ROAD:  visual_effect = e->u.road.visual_effect; break;
    case VEH_SHIP:  visual_effect = e->u.ship.visual_effect; break;
    default:        visual_effect = 1 << VE_DISABLE_EFFECT;  break;
  }
 
  /* Check powered wagon / visual effect callback */
  if (HasBit(e->info.callback_mask, CBM_VEHICLE_VISUAL_EFFECT)) {
    uint16 callback = GetVehicleCallback(CBID_VEHICLE_VISUAL_EFFECT, 0, 0, this->engine_type, this);
 
    if (callback != CALLBACK_FAILED) {
      if (callback >= 0x100 && e->GetGRF()->grf_version >= 8) ErrorUnknownCallbackResult(e->GetGRFID(), CBID_VEHICLE_VISUAL_EFFECT, callback);
 
      callback = GB(callback, 0, 8);
      /* Avoid accidentally setting 'visual_effect' to the default value
       * Since bit 6 (disable effects) is set anyways, we can safely erase some bits. */
      if (callback == VE_DEFAULT) {
        assert(HasBit(callback, VE_DISABLE_EFFECT));
        SB(callback, VE_TYPE_START, VE_TYPE_COUNT, 0);
      }
      visual_effect = callback;
    }
  }
 
  /* Apply default values */
  if (visual_effect == VE_DEFAULT ||
      (!HasBit(visual_effect, VE_DISABLE_EFFECT) && GB(visual_effect, VE_TYPE_START, VE_TYPE_COUNT) == VE_TYPE_DEFAULT)) {
    /* Only train engines have default effects.
     * Note: This is independent of whether the engine is a front engine or articulated part or whatever. */
    if (e->type != VEH_TRAIN || e->u.rail.railveh_type == RAILVEH_WAGON || !IsInsideMM(e->u.rail.engclass, EC_STEAM, EC_MONORAIL)) {
      if (visual_effect == VE_DEFAULT) {
        visual_effect = 1 << VE_DISABLE_EFFECT;
      } else {
        SetBit(visual_effect, VE_DISABLE_EFFECT);
      }
    } else {
      if (visual_effect == VE_DEFAULT) {
        /* Also set the offset */
        visual_effect = (VE_OFFSET_CENTRE - (e->u.rail.engclass == EC_STEAM ? 4 : 0)) << VE_OFFSET_START;
      }
      SB(visual_effect, VE_TYPE_START, VE_TYPE_COUNT, e->u.rail.engclass - EC_STEAM + VE_TYPE_STEAM);
    }
  }
 
  this->vcache.cached_vis_effect = visual_effect;
 
  if (!allow_power_change && powered_before != HasBit(this->vcache.cached_vis_effect, VE_DISABLE_WAGON_POWER)) {
    ToggleBit(this->vcache.cached_vis_effect, VE_DISABLE_WAGON_POWER);
    ShowNewGrfVehicleError(this->engine_type, STR_NEWGRF_BROKEN, STR_NEWGRF_BROKEN_POWERED_WAGON, GBUG_VEH_POWERED_WAGON, false);
  }
}
 
static const int8 _vehicle_smoke_pos[8] = {
  1, 1, 1, 0, -1, -1, -1, 0
};
 
static void SpawnAdvancedVisualEffect(const Vehicle *v)
{
  uint16 callback = GetVehicleCallback(CBID_VEHICLE_SPAWN_VISUAL_EFFECT, 0, Random(), v->engine_type, v);
  if (callback == CALLBACK_FAILED) return;
 
  uint count = GB(callback, 0, 2);
  bool auto_center = HasBit(callback, 13);
  bool auto_rotate = !HasBit(callback, 14);
 
  int8 l_center = 0;
  if (auto_center) {
    /* For road vehicles: Compute offset from vehicle position to vehicle center */
    if (v->type == VEH_ROAD) l_center = -(int)(VEHICLE_LENGTH - RoadVehicle::From(v)->gcache.cached_veh_length) / 2;
  } else {
    /* For trains: Compute offset from vehicle position to sprite position */
    if (v->type == VEH_TRAIN) l_center = (VEHICLE_LENGTH - Train::From(v)->gcache.cached_veh_length) / 2;
  }
 
  Direction l_dir = v->direction;
  if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION)) l_dir = ReverseDir(l_dir);
  Direction t_dir = ChangeDir(l_dir, DIRDIFF_90RIGHT);
 
  int8 x_center = _vehicle_smoke_pos[l_dir] * l_center;
  int8 y_center = _vehicle_smoke_pos[t_dir] * l_center;
 
  for (uint i = 0; i < count; i++) {
    uint32 reg = GetRegister(0x100 + i);
    uint type = GB(reg,  0, 8);
    int8 x    = GB(reg,  8, 8);
    int8 y    = GB(reg, 16, 8);
    int8 z    = GB(reg, 24, 8);
 
    if (auto_rotate) {
      int8 l = x;
      int8 t = y;
      x = _vehicle_smoke_pos[l_dir] * l + _vehicle_smoke_pos[t_dir] * t;
      y = _vehicle_smoke_pos[t_dir] * l - _vehicle_smoke_pos[l_dir] * t;
    }
 
    if (type >= 0xF0) {
      switch (type) {
        case 0xF1: CreateEffectVehicleRel(v, x_center + x, y_center + y, z, EV_STEAM_SMOKE); break;
        case 0xF2: CreateEffectVehicleRel(v, x_center + x, y_center + y, z, EV_DIESEL_SMOKE); break;
        case 0xF3: CreateEffectVehicleRel(v, x_center + x, y_center + y, z, EV_ELECTRIC_SPARK); break;
        case 0xFA: CreateEffectVehicleRel(v, x_center + x, y_center + y, z, EV_BREAKDOWN_SMOKE_AIRCRAFT); break;
        default: break;
      }
    }
  }
}
 
void Vehicle::ShowVisualEffect() const
{
  assert(this->IsPrimaryVehicle());
  bool sound = false;
 
  /* Do not show any smoke when:
   * - vehicle smoke is disabled by the player
   * - the vehicle is slowing down or stopped (by the player)
   * - the vehicle is moving very slowly
   */
  if (_settings_game.vehicle.smoke_amount == 0 ||
      this->vehstatus & (VS_TRAIN_SLOWING | VS_STOPPED) ||
      this->cur_speed < 2) {
    return;
  }
 
  /* Use the speed as limited by underground and orders. */
  uint max_speed = this->GetCurrentMaxSpeed();
 
  if (this->type == VEH_TRAIN) {
    const Train *t = Train::From(this);
    /* For trains, do not show any smoke when:
     * - the train is reversing
     * - is entering a station with an order to stop there and its speed is equal to maximum station entering speed
     */
    if (HasBit(t->flags, VRF_REVERSING) ||
        (IsRailStationTile(t->tile) && t->IsFrontEngine() && t->current_order.ShouldStopAtStation(t, GetStationIndex(t->tile)) &&
        t->cur_speed >= max_speed)) {
      return;
    }
  }
 
  const Vehicle *v = this;
 
  do {
    bool advanced = HasBit(v->vcache.cached_vis_effect, VE_ADVANCED_EFFECT);
    int effect_offset = GB(v->vcache.cached_vis_effect, VE_OFFSET_START, VE_OFFSET_COUNT) - VE_OFFSET_CENTRE;
    VisualEffectSpawnModel effect_model = VESM_NONE;
    if (advanced) {
      effect_offset = VE_OFFSET_CENTRE;
      effect_model = (VisualEffectSpawnModel)GB(v->vcache.cached_vis_effect, 0, VE_ADVANCED_EFFECT);
      if (effect_model >= VESM_END) effect_model = VESM_NONE; // unknown spawning model
    } else {
      effect_model = (VisualEffectSpawnModel)GB(v->vcache.cached_vis_effect, VE_TYPE_START, VE_TYPE_COUNT);
      assert(effect_model != (VisualEffectSpawnModel)VE_TYPE_DEFAULT); // should have been resolved by UpdateVisualEffect
      static_assert((uint)VESM_STEAM    == (uint)VE_TYPE_STEAM);
      static_assert((uint)VESM_DIESEL   == (uint)VE_TYPE_DIESEL);
      static_assert((uint)VESM_ELECTRIC == (uint)VE_TYPE_ELECTRIC);
    }
 
    /* Show no smoke when:
     * - Smoke has been disabled for this vehicle
     * - The vehicle is not visible
     * - The vehicle is under a bridge
     * - The vehicle is on a depot tile
     * - The vehicle is on a tunnel tile
     * - The vehicle is a train engine that is currently unpowered */
    if (effect_model == VESM_NONE ||
        v->vehstatus & VS_HIDDEN ||
        IsBridgeAbove(v->tile) ||
        IsDepotTile(v->tile) ||
        IsTunnelTile(v->tile) ||
        (v->type == VEH_TRAIN &&
        !HasPowerOnRail(Train::From(v)->railtype, GetTileRailType(v->tile)))) {
      continue;
    }
 
    EffectVehicleType evt = EV_END;
    switch (effect_model) {
      case VESM_STEAM:
        /* Steam smoke - amount is gradually falling until vehicle reaches its maximum speed, after that it's normal.
         * Details: while vehicle's current speed is gradually increasing, steam plumes' density decreases by one third each
         * third of its maximum speed spectrum. Steam emission finally normalises at very close to vehicle's maximum speed.
         * REGULATION:
         * - instead of 1, 4 / 2^smoke_amount (max. 2) is used to provide sufficient regulation to steam puffs' amount. */
        if (GB(v->tick_counter, 0, ((4 >> _settings_game.vehicle.smoke_amount) + ((this->cur_speed * 3) / max_speed))) == 0) {
          evt = EV_STEAM_SMOKE;
        }
        break;
 
      case VESM_DIESEL: {
        /* Diesel smoke - thicker when vehicle is starting, gradually subsiding till it reaches its maximum speed
         * when smoke emission stops.
         * Details: Vehicle's (max.) speed spectrum is divided into 32 parts. When max. speed is reached, chance for smoke
         * emission erodes by 32 (1/4). For trains, power and weight come in handy too to either increase smoke emission in
         * 6 steps (1000HP each) if the power is low or decrease smoke emission in 6 steps (512 tonnes each) if the train
         * isn't overweight. Power and weight contributions are expressed in a way that neither extreme power, nor
         * extreme weight can ruin the balance (e.g. FreightWagonMultiplier) in the formula. When the vehicle reaches
         * maximum speed no diesel_smoke is emitted.
         * REGULATION:
         * - up to which speed a diesel vehicle is emitting smoke (with reduced/small setting only until 1/2 of max_speed),
         * - in Chance16 - the last value is 512 / 2^smoke_amount (max. smoke when 128 = smoke_amount of 2). */
        int power_weight_effect = 0;
        if (v->type == VEH_TRAIN) {
          power_weight_effect = (32 >> (Train::From(this)->gcache.cached_power >> 10)) - (32 >> (Train::From(this)->gcache.cached_weight >> 9));
        }
        if (this->cur_speed < (max_speed >> (2 >> _settings_game.vehicle.smoke_amount)) &&
            Chance16((64 - ((this->cur_speed << 5) / max_speed) + power_weight_effect), (512 >> _settings_game.vehicle.smoke_amount))) {
          evt = EV_DIESEL_SMOKE;
        }
        break;
      }
 
      case VESM_ELECTRIC:
        /* Electric train's spark - more often occurs when train is departing (more load)
         * Details: Electric locomotives are usually at least twice as powerful as their diesel counterparts, so spark
         * emissions are kept simple. Only when starting, creating huge force are sparks more likely to happen, but when
         * reaching its max. speed, quarter by quarter of it, chance decreases until the usual 2,22% at train's top speed.
         * REGULATION:
         * - in Chance16 the last value is 360 / 2^smoke_amount (max. sparks when 90 = smoke_amount of 2). */
        if (GB(v->tick_counter, 0, 2) == 0 &&
            Chance16((6 - ((this->cur_speed << 2) / max_speed)), (360 >> _settings_game.vehicle.smoke_amount))) {
          evt = EV_ELECTRIC_SPARK;
        }
        break;
 
      default:
        NOT_REACHED();
    }
 
    if (evt != EV_END && advanced) {
      sound = true;
      SpawnAdvancedVisualEffect(v);
    } else if (evt != EV_END) {
      sound = true;
 
      /* The effect offset is relative to a point 4 units behind the vehicle's
       * front (which is the center of an 8/8 vehicle). Shorter vehicles need a
       * correction factor. */
      if (v->type == VEH_TRAIN) effect_offset += (VEHICLE_LENGTH - Train::From(v)->gcache.cached_veh_length) / 2;
 
      int x = _vehicle_smoke_pos[v->direction] * effect_offset;
      int y = _vehicle_smoke_pos[(v->direction + 2) % 8] * effect_offset;
 
      if (v->type == VEH_TRAIN && HasBit(Train::From(v)->flags, VRF_REVERSE_DIRECTION)) {
        x = -x;
        y = -y;
      }
 
      CreateEffectVehicleRel(v, x, y, 10, evt);
    }
  } while ((v = v->Next()) != nullptr);
 
  if (sound) PlayVehicleSound(this, VSE_VISUAL_EFFECT);
}
 
void Vehicle::SetNext(Vehicle *next)
{
  assert(this != next);
 
  if (this->next != nullptr) {
    /* We had an old next vehicle. Update the first and previous pointers */
    for (Vehicle *v = this->next; v != nullptr; v = v->Next()) {
      v->first = this->next;
    }
    this->next->previous = nullptr;
  }
 
  this->next = next;
 
  if (this->next != nullptr) {
    /* A new next vehicle. Update the first and previous pointers */
    if (this->next->previous != nullptr) this->next->previous->next = nullptr;
    this->next->previous = this;
    for (Vehicle *v = this->next; v != nullptr; v = v->Next()) {
      v->first = this->first;
    }
  }
}
 
void Vehicle::AddToShared(Vehicle *shared_chain)
{
  assert(this->previous_shared == nullptr && this->next_shared == nullptr);
 
  if (shared_chain->orders.list == nullptr) {
    assert(shared_chain->previous_shared == nullptr);
    assert(shared_chain->next_shared == nullptr);
    this->orders.list = shared_chain->orders.list = new OrderList(nullptr, shared_chain);
  }
 
  this->next_shared     = shared_chain->next_shared;
  this->previous_shared = shared_chain;
 
  shared_chain->next_shared = this;
 
  if (this->next_shared != nullptr) this->next_shared->previous_shared = this;
 
  shared_chain->orders.list->AddVehicle(this);
}
 
void Vehicle::RemoveFromShared()
{
  /* Remember if we were first and the old window number before RemoveVehicle()
   * as this changes first if needed. */
  bool were_first = (this->FirstShared() == this);
  VehicleListIdentifier vli(VL_SHARED_ORDERS, this->type, this->owner, this->FirstShared()->index);
 
  this->orders.list->RemoveVehicle(this);
 
  if (!were_first) {
    /* We are not the first shared one, so only relink our previous one. */
    this->previous_shared->next_shared = this->NextShared();
  }
 
  if (this->next_shared != nullptr) this->next_shared->previous_shared = this->previous_shared;
 
 
  if (this->orders.list->GetNumVehicles() == 1) {
    /* When there is only one vehicle, remove the shared order list window. */
    CloseWindowById(GetWindowClassForVehicleType(this->type), vli.Pack());
    InvalidateVehicleOrder(this->FirstShared(), VIWD_MODIFY_ORDERS);
  } else if (were_first) {
    /* If we were the first one, update to the new first one.
     * Note: FirstShared() is already the new first */
    InvalidateWindowData(GetWindowClassForVehicleType(this->type), vli.Pack(), this->FirstShared()->index | (1U << 31));
  }
 
  this->next_shared     = nullptr;
  this->previous_shared = nullptr;
}
 
void VehiclesYearlyLoop()
{
  for (Vehicle *v : Vehicle::Iterate()) {
    if (v->IsPrimaryVehicle()) {
      /* show warning if vehicle is not generating enough income last 2 years (corresponds to a red icon in the vehicle list) */
      Money profit = v->GetDisplayProfitThisYear();
      if (v->age >= 730 && profit < 0) {
        if (_settings_client.gui.vehicle_income_warn && v->owner == _local_company) {
          SetDParam(0, v->index);
          SetDParam(1, profit);
          AddVehicleAdviceNewsItem(STR_NEWS_VEHICLE_IS_UNPROFITABLE, v->index);
        }
        AI::NewEvent(v->owner, new ScriptEventVehicleUnprofitable(v->index));
      }
 
      v->profit_last_year = v->profit_this_year;
      v->profit_this_year = 0;
      SetWindowDirty(WC_VEHICLE_DETAILS, v->index);
    }
  }
  GroupStatistics::UpdateProfits();
  SetWindowClassesDirty(WC_TRAINS_LIST);
  SetWindowClassesDirty(WC_SHIPS_LIST);
  SetWindowClassesDirty(WC_ROADVEH_LIST);
  SetWindowClassesDirty(WC_AIRCRAFT_LIST);
}
 
 
bool CanVehicleUseStation(EngineID engine_type, const Station *st)
{
  const Engine *e = Engine::GetIfValid(engine_type);
  assert(e != nullptr);
 
  switch (e->type) {
    case VEH_TRAIN:
      return (st->facilities & FACIL_TRAIN) != 0;
 
    case VEH_ROAD:
      /* For road vehicles we need the vehicle to know whether it can actually
       * use the station, but if it doesn't have facilities for RVs it is
       * certainly not possible that the station can be used. */
      return (st->facilities & (FACIL_BUS_STOP | FACIL_TRUCK_STOP)) != 0;
 
    case VEH_SHIP:
      return (st->facilities & FACIL_DOCK) != 0;
 
    case VEH_AIRCRAFT:
      return (st->facilities & FACIL_AIRPORT) != 0 &&
          (st->airport.GetFTA()->flags & (e->u.air.subtype & AIR_CTOL ? AirportFTAClass::AIRPLANES : AirportFTAClass::HELICOPTERS)) != 0;
 
    default:
      return false;
  }
}
 
bool CanVehicleUseStation(const Vehicle *v, const Station *st)
{
  if (v->type == VEH_ROAD) return st->GetPrimaryRoadStop(RoadVehicle::From(v)) != nullptr;
 
  return CanVehicleUseStation(v->engine_type, st);
}
 
GroundVehicleCache *Vehicle::GetGroundVehicleCache()
{
  assert(this->IsGroundVehicle());
  if (this->type == VEH_TRAIN) {
    return &Train::From(this)->gcache;
  } else {
    return &RoadVehicle::From(this)->gcache;
  }
}
 
const GroundVehicleCache *Vehicle::GetGroundVehicleCache() const
{
  assert(this->IsGroundVehicle());
  if (this->type == VEH_TRAIN) {
    return &Train::From(this)->gcache;
  } else {
    return &RoadVehicle::From(this)->gcache;
  }
}
 
uint16 &Vehicle::GetGroundVehicleFlags()
{
  assert(this->IsGroundVehicle());
  if (this->type == VEH_TRAIN) {
    return Train::From(this)->gv_flags;
  } else {
    return RoadVehicle::From(this)->gv_flags;
  }
}
 
const uint16 &Vehicle::GetGroundVehicleFlags() const
{
  assert(this->IsGroundVehicle());
  if (this->type == VEH_TRAIN) {
    return Train::From(this)->gv_flags;
  } else {
    return RoadVehicle::From(this)->gv_flags;
  }
}
 
void GetVehicleSet(VehicleSet &set, Vehicle *v, uint8 num_vehicles)
{
  if (v->type == VEH_TRAIN) {
    Train *u = Train::From(v);
    /* Only include whole vehicles, so start with the first articulated part */
    u = u->GetFirstEnginePart();
 
    /* Include num_vehicles vehicles, not counting articulated parts */
    for (; u != nullptr && num_vehicles > 0; num_vehicles--) {
      do {
        /* Include current vehicle in the selection. */
        include(set, u->index);
 
        /* If the vehicle is multiheaded, add the other part too. */
        if (u->IsMultiheaded()) include(set, u->other_multiheaded_part->index);
 
        u = u->Next();
      } while (u != nullptr && u->IsArticulatedPart());
    }
  }
}