newgrf_roadtype.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 "core/container_func.hpp"
#include "debug.h"
#include "newgrf_roadtype.h"
#include "timer/timer_game_calendar.h"
#include "depot_base.h"
#include "town.h"
 
#include "safeguards.h"
 
/* virtual */ uint32_t RoadTypeScopeResolver::GetRandomBits() const
{
  uint tmp = CountBits(this->tile.base() + (TileX(this->tile) + TileY(this->tile)) * TILE_SIZE);
  return GB(tmp, 0, 2);
}
 
/* virtual */ uint32_t RoadTypeScopeResolver::GetVariable(uint8_t variable, [[maybe_unused]] uint32_t parameter, bool &available) const
{
  if (this->tile == INVALID_TILE) {
    switch (variable) {
      case 0x40: return 0;
      case 0x41: return 0;
      case 0x42: return 0;
      case 0x43: return TimerGameCalendar::date.base();
      case 0x44: return HZB_TOWN_EDGE;
    }
  }
 
  switch (variable) {
    case 0x40: return GetTerrainType(this->tile, this->context);
    case 0x41: return 0;
    case 0x42: return IsLevelCrossingTile(this->tile) && IsCrossingBarred(this->tile);
    case 0x43:
      if (IsRoadDepotTile(this->tile)) return Depot::GetByTile(this->tile)->build_date.base();
      return TimerGameCalendar::date.base();
    case 0x44: {
      const Town *t = nullptr;
      if (IsRoadDepotTile(this->tile)) {
        t = Depot::GetByTile(this->tile)->town;
      } else {
        t = ClosestTownFromTile(this->tile, UINT_MAX);
      }
      return t != nullptr ? GetTownRadiusGroup(t, this->tile) : HZB_TOWN_EDGE;
    }
  }
 
  Debug(grf, 1, "Unhandled road type tile variable 0x{:X}", variable);
 
  available = false;
  return UINT_MAX;
}
 
GrfSpecFeature RoadTypeResolverObject::GetFeature() const
{
  RoadType rt = GetRoadTypeByLabel(this->roadtype_scope.rti->label, false);
  switch (GetRoadTramType(rt)) {
    case RTT_ROAD: return GSF_ROADTYPES;
    case RTT_TRAM: return GSF_TRAMTYPES;
    default: return GSF_INVALID;
  }
}
 
uint32_t RoadTypeResolverObject::GetDebugID() const
{
  return this->roadtype_scope.rti->label;
}
 
RoadTypeResolverObject::RoadTypeResolverObject(const RoadTypeInfo *rti, TileIndex tile, TileContext context, RoadTypeSpriteGroup rtsg, uint32_t param1, uint32_t param2)
  : ResolverObject(rti != nullptr ? rti->grffile[rtsg] : nullptr, CBID_NO_CALLBACK, param1, param2), roadtype_scope(*this, rti, tile, context)
{
  this->root_spritegroup = rti != nullptr ? rti->group[rtsg] : nullptr;
}
 
SpriteID GetCustomRoadSprite(const RoadTypeInfo *rti, TileIndex tile, RoadTypeSpriteGroup rtsg, TileContext context, uint *num_results)
{
  assert(rtsg < ROTSG_END);
 
  if (rti->group[rtsg] == nullptr) return 0;
 
  RoadTypeResolverObject object(rti, tile, context, rtsg);
  const SpriteGroup *group = object.Resolve();
  if (group == nullptr || group->GetNumResults() == 0) return 0;
 
  if (num_results) *num_results = group->GetNumResults();
 
  return group->GetResult();
}
 
RoadType GetRoadTypeTranslation(RoadTramType rtt, uint8_t tracktype, const GRFFile *grffile)
{
  /* Because OpenTTD mixes RoadTypes and TramTypes into the same type,
   * the mapping of the original road- and tramtypes does not match the default GRF-local mapping.
   * So, this function cannot provide any similar behavior to GetCargoTranslation() and GetRailTypeTranslation()
   * when the GRF defines no translation table.
   * But since there is only one default road/tram-type, this makes little sense anyway.
   * So for GRF without translation table, we always return INVALID_ROADTYPE.
   */
 
  if (grffile == nullptr) return INVALID_ROADTYPE;
 
  const auto &list = rtt == RTT_TRAM ? grffile->tramtype_list : grffile->roadtype_list;
  if (tracktype >= list.size()) return INVALID_ROADTYPE;
 
  /* Look up roadtype including alternate labels. */
  RoadType result = GetRoadTypeByLabel(list[tracktype]);
 
  /* Check whether the result is actually the wanted road/tram-type */
  if (result != INVALID_ROADTYPE && GetRoadTramType(result) != rtt) return INVALID_ROADTYPE;
 
  return result;
}
 
uint8_t GetReverseRoadTypeTranslation(RoadType roadtype, const GRFFile *grffile)
{
  /* No road type table present, return road type as-is */
  if (grffile == nullptr) return roadtype;
 
  const std::vector<RoadTypeLabel> *list = RoadTypeIsRoad(roadtype) ? &grffile->roadtype_list : &grffile->tramtype_list;
  if (list->empty()) return roadtype;
 
  /* Look for a matching road type label in the table */
  RoadTypeLabel label = GetRoadTypeInfo(roadtype)->label;
 
  int index = find_index(*list, label);
  if (index >= 0) return index;
 
  /* If not found, return as invalid */
  return 0xFF;
}