add option to use game creator section ID

src/ItemCreator.cc

@@ -50,6 +50,7 @@ void ItemCreator::set_random_crypt(shared_ptr<PSOLFGEncryption> new_random_crypt
 }
 
 void ItemCreator::set_section_id(uint8_t new_section_id) {
+  if (this->section_id != new_section_id) {
     this->section_id = new_section_id;
     this->log.prefix = string_printf("[ItemCreator:%s/%s/%s/%c/%hhu] ",
         name_for_enum(stack_limits->version),
@@ -59,6 +60,7 @@ void ItemCreator::set_section_id(uint8_t new_section_id) {
         this->section_id);
     this->pt = common_item_set->get_table(this->episode, this->mode, this->difficulty, this->section_id);
   }
+}
 
 bool ItemCreator::are_rare_drops_allowed() const {
   // Note: The client has an additional check here, which appears to be a subtle

src/ItemCreator.hh

@@ -52,6 +52,9 @@ public:
   inline void set_restrictions(std::shared_ptr<const BattleRules> restrictions) {
     this->restrictions = restrictions;
   }
+  inline uint8_t get_section_id() const {
+    return this->section_id;
+  }
   void set_section_id(uint8_t new_section_id);
 
 private:

src/Lobby.cc

@@ -264,6 +264,8 @@ void Lobby::create_item_creator() {
 void Lobby::change_section_id() {
   if (this->item_creator) {
     uint8_t new_section_id = this->effective_section_id();
+    if (this->item_creator->get_section_id() != new_section_id) {
+      this->log.info("Changing section ID to %s", name_for_section_id(new_section_id));
       this->item_creator->set_section_id(new_section_id);
       for (const auto& c : this->clients) {
         if (c && c->config.check_flag(Client::Flag::DEBUG_ENABLED)) {
@@ -272,11 +274,15 @@ void Lobby::change_section_id() {
       }
     }
   }
+}
 
 uint8_t Lobby::effective_section_id() const {
   if (this->override_section_id != 0xFF) {
     return this->override_section_id;
   }
+  if (this->check_flag(Lobby::Flag::USE_CREATOR_SECTION_ID)) {
+    return this->creator_section_id;
+  }
   auto leader = this->clients.at(this->leader_id);
   if (leader) {
     return leader->character()->disp.visual.section_id;

src/Lobby.hh

@@ -56,9 +56,9 @@ struct Lobby : public std::enable_shared_from_this<Lobby> {
     uint32_t reassign_all_item_ids(uint32_t next_item_id);
   };
   enum class Flag {
+    // clang-format off
     GAME                            = 0x00000001,
     PERSISTENT                      = 0x00000002,
-
     // Flags used only for games
     CHEATS_ENABLED                  = 0x00000100,
     QUEST_IN_PROGRESS               = 0x00000200,
@@ -68,11 +68,12 @@ struct Lobby : public std::enable_shared_from_this<Lobby> {
     SPECTATORS_FORBIDDEN            = 0x00004000,
     START_BATTLE_PLAYER_IMMEDIATELY = 0x00008000,
     CANNOT_CHANGE_CHEAT_MODE        = 0x00010000,
-
+    USE_CREATOR_SECTION_ID          = 0x00020000,
     // Flags used only for lobbies
     PUBLIC                          = 0x01000000,
     DEFAULT                         = 0x02000000,
     IS_OVERFLOW                     = 0x08000000,
+    // clang-format on
   };
   enum class DropMode {
     DISABLED = 0,
@@ -107,6 +108,7 @@ struct Lobby : public std::enable_shared_from_this<Lobby> {
   // bits are indexed as (1 << version), where version is a value from the
   // Version enum.
   uint16_t allowed_versions;
+  uint8_t creator_section_id;
   uint8_t override_section_id;
   Episode episode;
   GameMode mode;

src/ReceiveCommands.cc

@@ -4178,11 +4178,15 @@ shared_ptr<Lobby> create_game_generic(
   if (!s->behavior_can_be_overridden(s->cheat_mode_behavior)) {
     game->set_flag(Lobby::Flag::CANNOT_CHANGE_CHEAT_MODE);
   }
+  if (s->use_game_creator_section_id) {
+    game->set_flag(Lobby::Flag::USE_CREATOR_SECTION_ID);
+  }
   if (watched_lobby || battle_player) {
     game->set_flag(Lobby::Flag::IS_SPECTATOR_TEAM);
   }
   game->password = password;
 
+  game->creator_section_id = p->disp.visual.section_id;
   game->override_section_id = c->config.override_section_id;
   game->episode = episode;
   game->mode = mode;

src/ServerState.cc

@@ -728,6 +728,7 @@ void ServerState::load_config_early() {
 
   this->persistent_game_idle_timeout_usecs = this->config_json->get_int("PersistentGameIdleTimeout", 0);
   this->cheat_mode_behavior = parse_behavior_switch("CheatModeBehavior", BehaviorSwitch::OFF_BY_DEFAULT);
+  this->use_game_creator_section_id = this->config_json->get_bool("UseGameCreatorSectionID", false);
   this->default_rare_notifs_enabled_v1_v2 = this->config_json->get_bool("RareNotificationsEnabledByDefault", false);
   this->default_rare_notifs_enabled_v3_v4 = this->default_rare_notifs_enabled_v1_v2;
   this->default_rare_notifs_enabled_v1_v2 = this->config_json->get_bool("RareNotificationsEnabledByDefaultV1V2", this->default_rare_notifs_enabled_v1_v2);

src/ServerState.hh

@@ -123,6 +123,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   bool hide_download_commands = true;
   RunShellBehavior run_shell_behavior = RunShellBehavior::DEFAULT;
   BehaviorSwitch cheat_mode_behavior = BehaviorSwitch::OFF_BY_DEFAULT;
+  bool use_game_creator_section_id = false;
   bool default_rare_notifs_enabled_v1_v2 = false;
   bool default_rare_notifs_enabled_v3_v4 = false;
   std::vector<std::shared_ptr<const PSOBBEncryption::KeyFile>> bb_private_keys;

system/config.example.json

@@ -814,7 +814,17 @@
   // drop modes in all game versions. If you want to scale the drop rates for
   // only some versions, use the --multiply option to the convert-rare-item-set
   // action instead.
-  "ServerGlobalDropRateMultiplier": 1,
+  "ServerGlobalDropRateMultiplier": 1.0,
+
+  // Whether to retain server drop tables when game leaders change. The client
+  // reloads its drop tables when the leader joins a game or returns to Pioneer
+  // 2; this leads to some edge cases that could be confusing for players, so
+  // newserv instead switches its server tables instantly to the new leader's
+  // section ID when the leader leaves the game. This option, if enabled, causes
+  // the server to instead use the game creator's section ID for the entire
+  // duration of the game. On versions other than BB, this only has an effect in
+  // server drop modes.
+  "UseGameCreatorSectionID": false,
 
   // BB team reward definitions. Team rewards have the following fields:
   //   Key: Internal name of the reward. Must be unique across all rewards.

tests/config.json

@@ -297,6 +297,8 @@
     "031000",
   ],
   "BBGlobalEXPMultiplier": 1,
+  "ServerGlobalDropRateMultiplier": 1.0,
+  "UseGameCreatorSectionID": false,
 
   "TeamRewards": [
     {