ai_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 "../core/bitmath_func.hpp"
#include "../company_base.h"
#include "../company_func.h"
#include "../network/network.h"
#include "../window_func.h"
#include "../framerate_type.h"
#include "ai_scanner.hpp"
#include "ai_instance.hpp"
#include "ai_config.hpp"
#include "ai_info.hpp"
#include "ai.hpp"
 
#include "../safeguards.h"
 
/* static */ uint AI::frame_counter = 0;
/* static */ AIScannerInfo *AI::scanner_info = nullptr;
/* static */ AIScannerLibrary *AI::scanner_library = nullptr;
 
/* static */ bool AI::CanStartNew()
{
  /* Only allow new AIs on the server and only when that is allowed in multiplayer */
  return !_networking || (_network_server && _settings_game.ai.ai_in_multiplayer);
}
 
/* static */ void AI::StartNew(CompanyID company)
{
  assert(Company::IsValidID(company));
 
  /* Clients shouldn't start AIs */
  if (_networking && !_network_server) return;
 
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  Company *c = Company::Get(company);
 
  AIConfig *config = c->ai_config.get();
  if (config == nullptr) {
    c->ai_config = std::make_unique<AIConfig>(AIConfig::GetConfig(company, AIConfig::SSS_FORCE_GAME));
    config = c->ai_config.get();
  }
 
  AIInfo *info = config->GetInfo();
  if (info == nullptr) {
    info = AI::scanner_info->SelectRandomAI();
    assert(info != nullptr);
    /* Load default data and store the name in the settings */
    config->Change(info->GetName(), -1, false);
  }
  config->AnchorUnchangeableSettings();
 
  c->ai_info = info;
  assert(c->ai_instance == nullptr);
  c->ai_instance = new AIInstance();
  c->ai_instance->Initialize(info);
  c->ai_instance->LoadOnStack(config->GetToLoadData());
  config->SetToLoadData(nullptr);
 
  cur_company.Restore();
 
  InvalidateWindowClassesData(WC_SCRIPT_DEBUG, -1);
  return;
}
 
/* static */ void AI::GameLoop()
{
  /* If we are in networking, only servers run this function, and that only if it is allowed */
  if (_networking && (!_network_server || !_settings_game.ai.ai_in_multiplayer)) return;
 
  /* The speed with which AIs go, is limited by the 'competitor_speed' */
  AI::frame_counter++;
  assert(_settings_game.difficulty.competitor_speed <= 4);
  if ((AI::frame_counter & ((1 << (4 - _settings_game.difficulty.competitor_speed)) - 1)) != 0) return;
 
  Backup<CompanyID> cur_company(_current_company, FILE_LINE);
  for (const Company *c : Company::Iterate()) {
    if (c->is_ai) {
      PerformanceMeasurer framerate((PerformanceElement)(PFE_AI0 + c->index));
      cur_company.Change(c->index);
      c->ai_instance->GameLoop();
      /* Occasionally collect garbage; every 255 ticks do one company.
       * Effectively collecting garbage once every two months per AI. */
      if ((AI::frame_counter & 255) == 0 && (CompanyID)GB(AI::frame_counter, 8, 4) == c->index) {
        c->ai_instance->CollectGarbage();
      }
    } else {
      PerformanceMeasurer::SetInactive((PerformanceElement)(PFE_AI0 + c->index));
    }
  }
  cur_company.Restore();
}
 
/* static */ uint AI::GetTick()
{
  return AI::frame_counter;
}
 
/* static */ void AI::Stop(CompanyID company)
{
  if (_networking && !_network_server) return;
  PerformanceMeasurer::SetInactive((PerformanceElement)(PFE_AI0 + company));
 
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  Company *c = Company::Get(company);
 
  delete c->ai_instance;
  c->ai_instance = nullptr;
  c->ai_info = nullptr;
  c->ai_config.reset();
 
  cur_company.Restore();
 
  InvalidateWindowClassesData(WC_SCRIPT_DEBUG, -1);
}
 
/* static */ void AI::Pause(CompanyID company)
{
  /* The reason why dedicated servers are forbidden to execute this
   * command is not because it is unsafe, but because there is no way
   * for the server owner to unpause the script again. */
  if (_network_dedicated) return;
 
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  Company::Get(company)->ai_instance->Pause();
 
  cur_company.Restore();
}
 
/* static */ void AI::Unpause(CompanyID company)
{
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  Company::Get(company)->ai_instance->Unpause();
 
  cur_company.Restore();
}
 
/* static */ bool AI::IsPaused(CompanyID company)
{
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  bool paused = Company::Get(company)->ai_instance->IsPaused();
 
  cur_company.Restore();
 
  return paused;
}
 
/* static */ void AI::KillAll()
{
  /* It might happen there are no companies .. than we have nothing to loop */
  if (Company::GetPoolSize() == 0) return;
 
  for (const Company *c : Company::Iterate()) {
    if (c->is_ai) AI::Stop(c->index);
  }
}
 
/* static */ void AI::Initialize()
{
  if (AI::scanner_info != nullptr) AI::Uninitialize(true);
 
  AI::frame_counter = 0;
  if (AI::scanner_info == nullptr) {
    TarScanner::DoScan(TarScanner::AI);
    AI::scanner_info = new AIScannerInfo();
    AI::scanner_info->Initialize();
    AI::scanner_library = new AIScannerLibrary();
    AI::scanner_library->Initialize();
  }
}
 
/* static */ void AI::Uninitialize(bool keepConfig)
{
  AI::KillAll();
 
  if (keepConfig) {
    /* Run a rescan, which indexes all AIInfos again, and check if we can
     *  still load all the AIS, while keeping the configs in place */
    Rescan();
  } else {
    delete AI::scanner_info;
    delete AI::scanner_library;
    AI::scanner_info = nullptr;
    AI::scanner_library = nullptr;
 
    for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
      if (_settings_game.ai_config[c] != nullptr) {
        delete _settings_game.ai_config[c];
        _settings_game.ai_config[c] = nullptr;
      }
      if (_settings_newgame.ai_config[c] != nullptr) {
        delete _settings_newgame.ai_config[c];
        _settings_newgame.ai_config[c] = nullptr;
      }
    }
  }
}
 
/* static */ void AI::ResetConfig()
{
  /* Check for both newgame as current game if we can reload the AIInfo inside
   *  the AIConfig. If not, remove the AI from the list (which will assign
   *  a random new AI on reload). */
  for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
    if (_settings_game.ai_config[c] != nullptr && _settings_game.ai_config[c]->HasScript()) {
      if (!_settings_game.ai_config[c]->ResetInfo(true)) {
        Debug(script, 0, "After a reload, the AI by the name '{}' was no longer found, and removed from the list.", _settings_game.ai_config[c]->GetName());
        _settings_game.ai_config[c]->Change(std::nullopt);
      }
    }
 
    if (_settings_newgame.ai_config[c] != nullptr && _settings_newgame.ai_config[c]->HasScript()) {
      if (!_settings_newgame.ai_config[c]->ResetInfo(false)) {
        Debug(script, 0, "After a reload, the AI by the name '{}' was no longer found, and removed from the list.", _settings_newgame.ai_config[c]->GetName());
        _settings_newgame.ai_config[c]->Change(std::nullopt);
      }
    }
 
    if (Company::IsValidAiID(c) && Company::Get(c)->ai_config != nullptr) {
      AIConfig *config = Company::Get(c)->ai_config.get();
      if (!config->ResetInfo(true)) {
        /* The code belonging to an already running AI was deleted. We can only do
         * one thing here to keep everything sane and that is kill the AI. After
         * killing the offending AI we start a random other one in it's place, just
         * like what would happen if the AI was missing during loading. */
        AI::Stop(c);
        AI::StartNew(c);
      } else {
        /* Update the reference in the Company struct. */
        Company::Get(c)->ai_info = config->GetInfo();
      }
    }
  }
}
 
/* static */ void AI::NewEvent(CompanyID company, 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;
  }
 
  /* Only AIs can have an event-queue */
  if (!Company::IsValidAiID(company)) {
    event->Release();
    return;
  }
 
  /* Queue the event */
  Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
  Company::Get(_current_company)->ai_instance->InsertEvent(event);
  cur_company.Restore();
 
  event->Release();
}
 
/* static */ void AI::BroadcastNewEvent(ScriptEvent *event, CompanyID skip_company)
{
  /* 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;
  }
 
  /* Try to send the event to all AIs */
  for (CompanyID c = COMPANY_FIRST; c < MAX_COMPANIES; c++) {
    if (c != skip_company) AI::NewEvent(c, event);
  }
 
  event->Release();
}
 
/* static */ void AI::Save(CompanyID company)
{
  if (!_networking || _network_server) {
    Company *c = Company::GetIfValid(company);
    assert(c != nullptr);
 
    /* When doing emergency saving, an AI can be not fully initialised. */
    if (c->ai_instance != nullptr) {
      Backup<CompanyID> cur_company(_current_company, company, FILE_LINE);
      c->ai_instance->Save();
      cur_company.Restore();
      return;
    }
  }
 
  AIInstance::SaveEmpty();
}
 
/* static */ void AI::GetConsoleList(std::back_insert_iterator<std::string> &output_iterator, bool newest_only)
{
  AI::scanner_info->GetConsoleList(output_iterator, newest_only);
}
 
/* static */ void AI::GetConsoleLibraryList(std::back_insert_iterator<std::string> &output_iterator)
{
   AI::scanner_library->GetConsoleList(output_iterator, true);
}
 
/* static */ const ScriptInfoList *AI::GetInfoList()
{
  return AI::scanner_info->GetInfoList();
}
 
/* static */ const ScriptInfoList *AI::GetUniqueInfoList()
{
  return AI::scanner_info->GetUniqueInfoList();
}
 
/* static */ AIInfo *AI::FindInfo(const std::string &name, int version, bool force_exact_match)
{
  return AI::scanner_info->FindInfo(name, version, force_exact_match);
}
 
/* static */ AILibrary *AI::FindLibrary(const std::string &library, int version)
{
  return AI::scanner_library->FindLibrary(library, version);
}
 
/* static */ void AI::Rescan()
{
  TarScanner::DoScan(TarScanner::AI);
 
  AI::scanner_info->RescanDir();
  AI::scanner_library->RescanDir();
  ResetConfig();
 
  InvalidateWindowData(WC_SCRIPT_LIST, 0, 1);
  SetWindowClassesDirty(WC_SCRIPT_DEBUG);
  InvalidateWindowClassesData(WC_SCRIPT_SETTINGS);
}
 
/* static */ bool AI::HasAI(const ContentInfo *ci, bool md5sum)
{
  return AI::scanner_info->HasScript(ci, md5sum);
}
 
/* static */ bool AI::HasAILibrary(const ContentInfo *ci, bool md5sum)
{
  return AI::scanner_library->HasScript(ci, md5sum);
}
 
/* static */ AIScannerInfo *AI::GetScannerInfo()
{
  return AI::scanner_info;
}
 
/* static */ AIScannerLibrary *AI::GetScannerLibrary()
{
  return AI::scanner_library;
}