game_core.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/backup_type.hpp"
#include "../company_base.h"
#include "../company_func.h"
#include "../network/network.h"
#include "../window_func.h"
#include "../framerate_type.h"
#include "game.hpp"
#include "game_scanner.hpp"
#include "game_config.hpp"
#include "game_instance.hpp"
#include "game_info.hpp"
 
#include "../safeguards.h"
 
/* static */ uint Game::frame_counter = 0;
/* static */ GameInfo *Game::info = nullptr;
/* static */ GameInstance *Game::instance = nullptr;
/* static */ GameScannerInfo *Game::scanner_info = nullptr;
/* static */ GameScannerLibrary *Game::scanner_library = nullptr;
 
/* static */ void Game::GameLoop()
{
  if (_networking && !_network_server) {
    PerformanceMeasurer::SetInactive(PFE_GAMESCRIPT);
    return;
  }
  if (Game::instance == nullptr) {
    PerformanceMeasurer::SetInactive(PFE_GAMESCRIPT);
    return;
  }
 
  PerformanceMeasurer framerate(PFE_GAMESCRIPT);
 
  Game::frame_counter++;
 
  Backup<CompanyID> cur_company(_current_company);
  cur_company.Change(OWNER_DEITY);
  Game::instance->GameLoop();
  cur_company.Restore();
 
  /* Occasionally collect garbage */
  if ((Game::frame_counter & 255) == 0) {
    Game::instance->CollectGarbage();
  }
}
 
/* static */ void Game::Initialize()
{
  if (Game::instance != nullptr) Game::Uninitialize(true);
 
  Game::frame_counter = 0;
 
  if (Game::scanner_info == nullptr) {
    TarScanner::DoScan(TarScanner::GAME);
    Game::scanner_info = new GameScannerInfo();
    Game::scanner_info->Initialize();
    Game::scanner_library = new GameScannerLibrary();
    Game::scanner_library->Initialize();
  }
}
 
/* static */ void Game::StartNew()
{
  if (Game::instance != nullptr) return;
 
  /* Don't start GameScripts in intro */
  if (_game_mode == GM_MENU) return;
 
  /* Clients shouldn't start GameScripts */
  if (_networking && !_network_server) return;
 
  GameConfig *config = GameConfig::GetConfig(GameConfig::SSS_FORCE_GAME);
  GameInfo *info = config->GetInfo();
  if (info == nullptr) return;
 
  config->AnchorUnchangeableSettings();
 
  Backup<CompanyID> cur_company(_current_company);
  cur_company.Change(OWNER_DEITY);
 
  Game::info = info;
  Game::instance = new GameInstance();
  Game::instance->Initialize(info);
  Game::instance->LoadOnStack(config->GetToLoadData());
  config->SetToLoadData(nullptr);
 
  cur_company.Restore();
 
  InvalidateWindowClassesData(WC_SCRIPT_DEBUG, -1);
}
 
/* static */ void Game::Uninitialize(bool keepConfig)
{
  Backup<CompanyID> cur_company(_current_company);
 
  delete Game::instance;
  Game::instance = nullptr;
  Game::info = nullptr;
 
  cur_company.Restore();
 
  if (keepConfig) {
    Rescan();
  } else {
    delete Game::scanner_info;
    delete Game::scanner_library;
    Game::scanner_info = nullptr;
    Game::scanner_library = nullptr;
 
    if (_settings_game.game_config != nullptr) {
      delete _settings_game.game_config;
      _settings_game.game_config = nullptr;
    }
    if (_settings_newgame.game_config != nullptr) {
      delete _settings_newgame.game_config;
      _settings_newgame.game_config = nullptr;
    }
  }
}
 
/* static */ void Game::Pause()
{
  if (Game::instance != nullptr) Game::instance->Pause();
}
 
/* static */ void Game::Unpause()
{
  if (Game::instance != nullptr) Game::instance->Unpause();
}
 
/* static */ bool Game::IsPaused()
{
  return Game::instance != nullptr? Game::instance->IsPaused() : false;
}
 
/* static */ void Game::NewEvent(ScriptEvent *event)
{
  /* AddRef() and Release() need to be called at least once, so do it here */
  event->AddRef();
 
  /* Clients should ignore events */
  if (_networking && !_network_server) {
    event->Release();
    return;
  }
 
  /* Check if Game instance is alive */
  if (Game::instance == nullptr) {
    event->Release();
    return;
  }
 
  /* Queue the event */
  Backup<CompanyID> cur_company(_current_company, OWNER_DEITY);
  Game::instance->InsertEvent(event);
  cur_company.Restore();
 
  event->Release();
}
 
/* static */ void Game::ResetConfig()
{
  /* Check for both newgame as current game if we can reload the GameInfo inside
   *  the GameConfig. If not, remove the Game from the list. */
  if (_settings_game.game_config != nullptr && _settings_game.game_config->HasScript()) {
    if (!_settings_game.game_config->ResetInfo(true)) {
      Debug(script, 0, "After a reload, the GameScript by the name '{}' was no longer found, and removed from the list.", _settings_game.game_config->GetName());
      _settings_game.game_config->Change(std::nullopt);
      if (Game::instance != nullptr) {
        delete Game::instance;
        Game::instance = nullptr;
        Game::info = nullptr;
      }
    } else if (Game::instance != nullptr) {
      Game::info = _settings_game.game_config->GetInfo();
    }
  }
  if (_settings_newgame.game_config != nullptr && _settings_newgame.game_config->HasScript()) {
    if (!_settings_newgame.game_config->ResetInfo(false)) {
      Debug(script, 0, "After a reload, the GameScript by the name '{}' was no longer found, and removed from the list.", _settings_newgame.game_config->GetName());
      _settings_newgame.game_config->Change(std::nullopt);
    }
  }
}
 
/* static */ void Game::Rescan()
{
  TarScanner::DoScan(TarScanner::GAME);
 
  Game::scanner_info->RescanDir();
  Game::scanner_library->RescanDir();
  ResetConfig();
 
  InvalidateWindowData(WC_SCRIPT_LIST, 0, 1);
  SetWindowClassesDirty(WC_SCRIPT_DEBUG);
  InvalidateWindowClassesData(WC_SCRIPT_SETTINGS);
  InvalidateWindowClassesData(WC_GAME_OPTIONS);
}
 
 
/* static */ void Game::Save()
{
  if (Game::instance != nullptr && (!_networking || _network_server)) {
    Backup<CompanyID> cur_company(_current_company, OWNER_DEITY);
    Game::instance->Save();
    cur_company.Restore();
  } else {
    GameInstance::SaveEmpty();
  }
}
 
/* static */ void Game::GetConsoleList(std::back_insert_iterator<std::string> &output_iterator, bool newest_only)
{
  Game::scanner_info->GetConsoleList(output_iterator, newest_only);
}
 
/* static */ void Game::GetConsoleLibraryList(std::back_insert_iterator<std::string> &output_iterator)
{
  Game::scanner_library->GetConsoleList(output_iterator, true);
}
 
/* static */ const ScriptInfoList *Game::GetInfoList()
{
  return Game::scanner_info->GetInfoList();
}
 
/* static */ const ScriptInfoList *Game::GetUniqueInfoList()
{
  return Game::scanner_info->GetUniqueInfoList();
}
 
/* static */ GameInfo *Game::FindInfo(const std::string &name, int version, bool force_exact_match)
{
  return Game::scanner_info->FindInfo(name, version, force_exact_match);
}
 
/* static */ GameLibrary *Game::FindLibrary(const std::string &library, int version)
{
  return Game::scanner_library->FindLibrary(library, version);
}
 
/* static */ bool Game::HasGame(const ContentInfo *ci, bool md5sum)
{
  return Game::scanner_info->HasScript(ci, md5sum);
}
 
/* static */ bool Game::HasGameLibrary(const ContentInfo *ci, bool md5sum)
{
  return Game::scanner_library->HasScript(ci, md5sum);
}
 
/* static */ GameScannerInfo *Game::GetScannerInfo()
{
  return Game::scanner_info;
}
/* static */ GameScannerLibrary *Game::GetScannerLibrary()
{
  return Game::scanner_library;
}