genworld.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 "landscape.h"
#include "company_func.h"
#include "town_cmd.h"
#include "signs_cmd.h"
#include "3rdparty/nlohmann/json.hpp"
#include "strings_func.h"
#include "genworld.h"
#include "gfxinit.h"
#include "window_func.h"
#include "network/network.h"
#include "heightmap.h"
#include "viewport_func.h"
#include "timer/timer_game_calendar.h"
#include "timer/timer_game_tick.h"
#include "engine_func.h"
#include "water.h"
#include "video/video_driver.hpp"
#include "tilehighlight_func.h"
#include "saveload/saveload.h"
#include "void_map.h"
#include "town.h"
#include "newgrf.h"
#include "newgrf_house.h"
#include "core/random_func.hpp"
#include "core/backup_type.hpp"
#include "progress.h"
#include "error.h"
#include "game/game.hpp"
#include "game/game_instance.hpp"
#include "newgrf_railtype.h"
#include "newgrf_roadtype.h"
#include "string_func.h"
#include "thread.h"
#include "tgp.h"
 
#include "safeguards.h"
 
 
void GenerateClearTile();
void GenerateIndustries();
void GenerateObjects();
void GenerateTrees();
 
void StartupEconomy();
void StartupCompanies();
void StartupDisasters();
 
void InitializeGame(uint size_x, uint size_y, bool reset_date, bool reset_settings);
 
GenWorldInfo _gw;
 
bool _generating_world;
 
class AbortGenerateWorldSignal { };
 
static void CleanupGeneration()
{
  _generating_world = false;
 
  SetMouseCursorBusy(false);
  SetModalProgress(false);
  _gw.proc     = nullptr;
  _gw.abortp   = nullptr;
 
  CloseWindowByClass(WC_MODAL_PROGRESS);
  ShowFirstError();
  MarkWholeScreenDirty();
}
 
static void _GenerateWorld()
{
  /* Make sure everything is done via OWNER_NONE. */
  Backup<CompanyID> _cur_company(_current_company, OWNER_NONE);
 
  try {
    _generating_world = true;
    if (_network_dedicated) Debug(net, 3, "Generating map, please wait...");
    /* Set the Random() seed to generation_seed so we produce the same map with the same seed */
    _random.SetSeed(_settings_game.game_creation.generation_seed);
    SetGeneratingWorldProgress(GWP_MAP_INIT, 2);
    SetObjectToPlace(SPR_CURSOR_ZZZ, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);
    ScriptObject::InitializeRandomizers();
 
    BasePersistentStorageArray::SwitchMode(PSM_ENTER_GAMELOOP);
 
    IncreaseGeneratingWorldProgress(GWP_MAP_INIT);
    /* Must start economy early because of the costs. */
    StartupEconomy();
    if (!CheckTownRoadTypes()) {
      HandleGeneratingWorldAbortion();
      return;
    }
 
    bool landscape_generated = false;
 
    /* Don't generate landscape items when in the scenario editor. */
    if (_gw.mode != GWM_EMPTY) {
      landscape_generated = GenerateLandscape(_gw.mode);
    }
 
    if (!landscape_generated) {
      SetGeneratingWorldProgress(GWP_OBJECT, 1);
 
      /* Make sure the tiles at the north border are void tiles if needed. */
      if (_settings_game.construction.freeform_edges) {
        for (uint x = 0; x < Map::SizeX(); x++) MakeVoid(TileXY(x, 0));
        for (uint y = 0; y < Map::SizeY(); y++) MakeVoid(TileXY(0, y));
      }
 
      /* Make the map the height of the setting */
      if (_game_mode != GM_MENU) FlatEmptyWorld(_settings_game.game_creation.se_flat_world_height);
 
      ConvertGroundTilesIntoWaterTiles();
      IncreaseGeneratingWorldProgress(GWP_OBJECT);
 
      _settings_game.game_creation.snow_line_height = DEF_SNOWLINE_HEIGHT;
    } else {
      GenerateClearTile();
 
      /* Only generate towns, tree and industries in newgame mode. */
      if (_game_mode != GM_EDITOR) {
        if (!GenerateTowns(_settings_game.economy.town_layout)) {
          HandleGeneratingWorldAbortion();
          return;
        }
        GenerateIndustries();
        GenerateObjects();
        GenerateTrees();
      }
    }
 
    /* These are probably pointless when inside the scenario editor. */
    SetGeneratingWorldProgress(GWP_GAME_INIT, 3);
    StartupCompanies();
    IncreaseGeneratingWorldProgress(GWP_GAME_INIT);
    StartupEngines();
    IncreaseGeneratingWorldProgress(GWP_GAME_INIT);
    StartupDisasters();
    _generating_world = false;
 
    /* No need to run the tile loop in the scenario editor. */
    if (_gw.mode != GWM_EMPTY) {
      uint i;
 
      SetGeneratingWorldProgress(GWP_RUNTILELOOP, 0x500);
      for (i = 0; i < 0x500; i++) {
        RunTileLoop();
        TimerGameTick::counter++;
        IncreaseGeneratingWorldProgress(GWP_RUNTILELOOP);
      }
 
      if (_game_mode != GM_EDITOR) {
        Game::StartNew();
 
        if (Game::GetInstance() != nullptr) {
          SetGeneratingWorldProgress(GWP_RUNSCRIPT, 2500);
          _generating_world = true;
          for (i = 0; i < 2500; i++) {
            Game::GameLoop();
            IncreaseGeneratingWorldProgress(GWP_RUNSCRIPT);
            if (Game::GetInstance()->IsSleeping()) break;
          }
          _generating_world = false;
        }
      }
    }
 
    BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP);
 
    ResetObjectToPlace();
    _cur_company.Trash();
    _current_company = _local_company = _gw.lc;
    /* Show all vital windows again, because we have hidden them. */
    if (_game_mode != GM_MENU) ShowVitalWindows();
 
    SetGeneratingWorldProgress(GWP_GAME_START, 1);
    /* Call any callback */
    if (_gw.proc != nullptr) _gw.proc();
    IncreaseGeneratingWorldProgress(GWP_GAME_START);
 
    CleanupGeneration();
 
    ShowNewGRFError();
 
    if (_network_dedicated) Debug(net, 3, "Map generated, starting game");
    Debug(desync, 1, "new_map: {:08x}", _settings_game.game_creation.generation_seed);
 
    if (_debug_desync_level > 0) {
      std::string name = fmt::format("dmp_cmds_{:08x}_{:08x}.sav", _settings_game.game_creation.generation_seed, TimerGameEconomy::date);
      SaveOrLoad(name, SLO_SAVE, DFT_GAME_FILE, AUTOSAVE_DIR, false);
    }
  } catch (AbortGenerateWorldSignal&) {
    CleanupGeneration();
 
    BasePersistentStorageArray::SwitchMode(PSM_LEAVE_GAMELOOP, true);
    if (_cur_company.IsValid()) _cur_company.Restore();
 
    if (_network_dedicated) {
      /* Exit the game to prevent a return to main menu.  */
      Debug(net, 0, "Generating map failed; closing server");
      _exit_game = true;
    } else {
      SwitchToMode(_switch_mode);
    }
  }
}
 
void GenerateWorldSetCallback(GWDoneProc *proc)
{
  _gw.proc = proc;
}
 
void GenerateWorldSetAbortCallback(GWAbortProc *proc)
{
  _gw.abortp = proc;
}
 
void AbortGeneratingWorld()
{
  _gw.abort = true;
}
 
bool IsGeneratingWorldAborted()
{
  return _gw.abort || _exit_game;
}
 
void HandleGeneratingWorldAbortion()
{
  /* Clean up - in SE create an empty map, otherwise, go to intro menu */
  _switch_mode = (_game_mode == GM_EDITOR) ? SM_EDITOR : SM_MENU;
 
  if (_gw.abortp != nullptr) _gw.abortp();
 
  throw AbortGenerateWorldSignal();
}
 
void GenerateWorld(GenWorldMode mode, uint size_x, uint size_y, bool reset_settings)
{
  if (HasModalProgress()) return;
  _gw.mode   = mode;
  _gw.size_x = size_x;
  _gw.size_y = size_y;
  SetModalProgress(true);
  _gw.abort  = false;
  _gw.abortp = nullptr;
  _gw.lc     = _local_company;
 
  /* This disables some commands and stuff */
  SetLocalCompany(COMPANY_SPECTATOR);
 
  InitializeGame(_gw.size_x, _gw.size_y, true, reset_settings);
  PrepareGenerateWorldProgress();
 
  if (_settings_game.construction.map_height_limit == 0) {
    uint estimated_height = 0;
 
    if (_gw.mode == GWM_EMPTY && _game_mode != GM_MENU) {
      estimated_height = _settings_game.game_creation.se_flat_world_height;
    } else if (_gw.mode == GWM_HEIGHTMAP) {
      estimated_height = _settings_game.game_creation.heightmap_height;
    } else if (_settings_game.game_creation.land_generator == LG_TERRAGENESIS) {
      estimated_height = GetEstimationTGPMapHeight();
    } else {
      estimated_height = 0;
    }
 
    _settings_game.construction.map_height_limit = std::max(MAP_HEIGHT_LIMIT_AUTO_MINIMUM, std::min(MAX_MAP_HEIGHT_LIMIT, estimated_height + MAP_HEIGHT_LIMIT_AUTO_CEILING_ROOM));
  }
 
  if (_settings_game.game_creation.generation_seed == GENERATE_NEW_SEED) _settings_game.game_creation.generation_seed = InteractiveRandom();
 
  /* Load the right landscape stuff, and the NewGRFs! */
  GfxLoadSprites();
  SetCurrentRailTypeLabelList();
  SetCurrentRoadTypeLabelList();
  InitializeBuildingCounts();
  LoadStringWidthTable();
 
  /* Re-init the windowing system */
  ResetWindowSystem();
 
  /* Create toolbars */
  SetupColoursAndInitialWindow();
  SetObjectToPlace(SPR_CURSOR_ZZZ, PAL_NONE, HT_NONE, WC_MAIN_WINDOW, 0);
 
  UnshowCriticalError();
  CloseAllNonVitalWindows();
  HideVitalWindows();
 
  ShowGenerateWorldProgress();
 
  /* Centre the view on the map */
  ScrollMainWindowToTile(TileXY(Map::SizeX() / 2, Map::SizeY() / 2), true);
 
  _GenerateWorld();
}
 
struct ExternalTownData {
  TownID town_id; 
  std::string name; 
  uint population; 
  bool is_city; 
  float x_proportion; 
  float y_proportion; 
};
 
static bool TryFoundTownNearby(TileIndex tile, void *user_data)
{
  ExternalTownData &town = *static_cast<ExternalTownData *>(user_data);
  std::tuple<CommandCost, Money, TownID> result = Command<CMD_FOUND_TOWN>::Do(DC_EXEC, tile, TSZ_SMALL, town.is_city, _settings_game.economy.town_layout, false, 0, town.name);
 
  TownID id = std::get<TownID>(result);
 
  /* Check if the command failed. */
  if (id == INVALID_TOWN) return false;
 
  /* The command succeeded, send the ID back through user_data. */
  town.town_id = id;
  return true;
}
 
void LoadTownData()
{
  /* Load the JSON file as a string initially. We'll parse it soon. */
  size_t filesize;
  auto f = FioFOpenFile(_file_to_saveload.name, "rb", HEIGHTMAP_DIR, &filesize);
 
  if (!f.has_value()) {
    ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
    return;
  }
 
  std::string text(filesize, '\0');
  size_t len = fread(text.data(), filesize, 1, *f);
  f.reset();
  if (len != 1) {
    ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
    return;
  }
 
  /* Now parse the JSON. */
  nlohmann::json town_data;
  try {
    town_data = nlohmann::json::parse(text);
  } catch (nlohmann::json::exception &) {
    ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
    return;
  }
 
  /* Check for JSON formatting errors with the array of towns. */
  if (!town_data.is_array()) {
    ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
    return;
  }
 
  std::vector<std::pair<Town *, uint> > towns;
  uint failed_towns = 0;
 
  /* Iterate through towns and attempt to found them. */
  for (auto &feature : town_data) {
    ExternalTownData town;
 
    /* Ensure JSON is formatted properly. */
    if (!feature.is_object()) {
      ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
      return;
    }
 
    /* Check to ensure all fields exist and are of the correct type.
     * If the town name is formatted wrong, all we can do is give a general warning. */
    if (!feature.contains("name") || !feature.at("name").is_string()) {
      ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_JSON_FORMATTED_INCORRECTLY, WL_ERROR);
      return;
    }
 
    /* If other fields are formatted wrong, we can actually inform the player which town is the problem. */
    if (!feature.contains("population") || !feature.at("population").is_number() ||
        !feature.contains("city") || !feature.at("city").is_boolean() ||
        !feature.contains("x") || !feature.at("x").is_number() ||
        !feature.contains("y") || !feature.at("y").is_number()) {
      feature.at("name").get_to(town.name);
      SetDParamStr(0, town.name);
      ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_TOWN_FORMATTED_INCORRECTLY, WL_ERROR);
      return;
    }
 
    /* Set town properties. */
    feature.at("name").get_to(town.name);
    feature.at("population").get_to(town.population);
    feature.at("city").get_to(town.is_city);
 
    /* Set town coordinates. */
    feature.at("x").get_to(town.x_proportion);
    feature.at("y").get_to(town.y_proportion);
 
    /* Check for improper coordinates and warn the player. */
    if (town.x_proportion <= 0.0f || town.y_proportion <= 0.0f || town.x_proportion >= 1.0f || town.y_proportion >= 1.0f) {
      SetDParamStr(0, town.name);
      ShowErrorMessage(STR_TOWN_DATA_ERROR_LOAD_FAILED, STR_TOWN_DATA_ERROR_BAD_COORDINATE, WL_ERROR);
      return;
    }
 
    /* Find the target tile for the town. */
    TileIndex tile;
    switch (_settings_game.game_creation.heightmap_rotation) {
      case HM_CLOCKWISE:
        /* Tile coordinates align with what we expect. */
        tile = TileXY(town.x_proportion * Map::MaxX(), town.y_proportion * Map::MaxY());
        break;
      case HM_COUNTER_CLOCKWISE:
        /* Tile coordinates are rotated and must be adjusted. */
        tile = TileXY((1 - town.y_proportion * Map::MaxX()), town.x_proportion * Map::MaxY());
        break;
      default: NOT_REACHED();
    }
 
    /* Try founding on the target tile, and if that doesn't work, find the nearest suitable tile up to 16 tiles away.
     * The target might be on water, blocked somehow, or on a steep slope that can't be terraformed by the founding command. */
    TileIndex search_tile = tile;
    bool success = CircularTileSearch(&search_tile, 16, 0, 0, TryFoundTownNearby, &town);
 
    /* If we still fail to found the town, we'll create a sign at the intended location and tell the player how many towns we failed to create in an error message.
     * This allows the player to diagnose a heightmap misalignment, if towns end up in the sea, or place towns manually, if in rough terrain. */
    if (!success) {
      Command<CMD_PLACE_SIGN>::Post(tile, town.name);
      failed_towns++;
      continue;
    }
 
    towns.emplace_back(std::make_pair(Town::Get(town.town_id), town.population));
  }
 
  /* If we couldn't found a town (or multiple), display a message to the player with the number of failed towns. */
  if (failed_towns > 0) {
    SetDParam(0, failed_towns);
    ShowErrorMessage(STR_TOWN_DATA_ERROR_FAILED_TO_FOUND_TOWN, INVALID_STRING_ID, WL_WARNING);
  }
 
  /* Now that we've created the towns, let's grow them to their target populations. */
  for (const auto &item : towns) {
    Town *t = item.first;
    uint population = item.second;
 
    /* Grid towns can grow almost forever, but the town growth algorithm gets less and less efficient as it wanders roads randomly,
     * so we set an arbitrary limit. With a flat map and a 3x3 grid layout this results in about 4900 houses, or 2800 houses with "Better roads." */
    int try_limit = 1000;
 
    /* If a town repeatedly fails to grow, continuing to try only wastes time. */
    int fail_limit = 10;
 
    /* Grow by a constant number of houses each time, instead of growth based on current town size.
     * We want our try limit to apply in a predictable way, no matter the road layout and other geography. */
    const int HOUSES_TO_GROW = 10;
 
    do {
      uint before = t->cache.num_houses;
      Command<CMD_EXPAND_TOWN>::Post(t->index, HOUSES_TO_GROW);
      if (t->cache.num_houses <= before) fail_limit--;
    } while (fail_limit > 0 && try_limit-- > 0 && t->cache.population < population);
  }
}