Make GC V3 EXP boost config-driven

src/ReceiveSubcommands.cc

@@ -3688,6 +3688,79 @@ static asio::awaitable<void> dispatch_dc_v2_exp_patch(shared_ptr<Client> c) {
   }
 }
 
+// Dispatch the correct GC V3 EXP table for the current episode when the
+// universal GC EXP enable shim is active. This avoids EP1/EP2 patches
+// overwriting each other or leaving stale episode tables in memory.
+static asio::awaitable<void> dispatch_gc_v3_exp_patch(shared_ptr<Client> c) {
+  if (c->version() != Version::GC_V3) {
+    co_return;
+  }
+  if (not c->check_flag(Client::Flag::HAS_SEND_FUNCTION_CALL)) {
+    co_return;
+  }
+  if (not c->login || not c->login->account) {
+    co_return;
+  }
+  if (not c->login->account->auto_patches_enabled.count("PsoPeepsGCV3EXP_enabled")) {
+    co_return;
+  }
+
+  auto l = c->require_lobby();
+  if (not l->is_game()) {
+    co_return;
+  }
+
+  const char* key = nullptr;
+  size_t num_exp_labels = 0;
+  switch (l->episode) {
+    case Episode::EP1:
+      key = "PsoPeepsEP1EXP_internal";
+      num_exp_labels = 204;
+      break;
+    case Episode::EP2:
+      key = "PsoPeepsEP2EXP_internal";
+      num_exp_labels = 239;
+      break;
+    default:
+      co_return;
+  }
+
+  try {
+    auto server_state = c->require_server_state();
+    auto base_fn = server_state->client_functions->get(key, c->specific_version);
+    auto fn = make_shared<ClientFunctionIndex::Function>(*base_fn);
+
+    for (size_t z = 0; z < num_exp_labels; z++) {
+      string label = std::format("exp_{:03}", z);
+      size_t offset = fn->label_offsets.at(label);
+      if (offset > fn->code.size() - 4) {
+        throw runtime_error("GC V3 EXP label out of range");
+      }
+
+      uint32_t base_exp =
+          (static_cast<uint32_t>(static_cast<uint8_t>(fn->code[offset])) << 24) |
+          (static_cast<uint32_t>(static_cast<uint8_t>(fn->code[offset + 1])) << 16) |
+          (static_cast<uint32_t>(static_cast<uint8_t>(fn->code[offset + 2])) << 8) |
+          static_cast<uint32_t>(static_cast<uint8_t>(fn->code[offset + 3]));
+
+      uint64_t scaled_exp = static_cast<uint64_t>(base_exp) *
+          static_cast<uint64_t>(server_state->gc_v3_exp_multiplier);
+      if (scaled_exp > 0xFFFFFFFFULL) {
+        scaled_exp = 0xFFFFFFFFULL;
+      }
+
+      fn->code[offset] = static_cast<char>((scaled_exp >> 24) & 0xFF);
+      fn->code[offset + 1] = static_cast<char>((scaled_exp >> 16) & 0xFF);
+      fn->code[offset + 2] = static_cast<char>((scaled_exp >> 8) & 0xFF);
+      fn->code[offset + 3] = static_cast<char>(scaled_exp & 0xFF);
+    }
+
+    co_await send_function_call(c, fn);
+  } catch (const out_of_range&) {
+    c->log.warning_f("GC V3 EXP dispatcher could not find client function {}", key);
+  }
+}
+
 static asio::awaitable<void> on_trigger_set_event(shared_ptr<Client> c, SubcommandMessage& msg) {
   auto l = c->require_lobby();
   if (!l->is_game()) {
@@ -3695,6 +3768,7 @@ static asio::awaitable<void> on_trigger_set_event(shared_ptr<Client> c, Subcomma
   }
 
   co_await dispatch_dc_v2_exp_patch(c);
+  co_await dispatch_gc_v3_exp_patch(c);
 
   const auto& cmd = msg.check_size_t<G_TriggerSetEvent_6x67>();
   auto event_sts = l->map_state->event_states_for_id(c->version(), cmd.floor, cmd.event_id);

src/ServerState.cc

@@ -1139,6 +1139,7 @@ void ServerState::load_config_early() {
 
   this->bb_global_exp_multiplier = this->config_json->get_float("BBGlobalEXPMultiplier", 1.0f);
   this->dc_v2_exp_multiplier = std::max<int64_t>(1, this->config_json->get_int("DCV2EXPMultiplier", 1));
+  this->gc_v3_exp_multiplier = std::max<int64_t>(1, this->config_json->get_int("GCV3EXPMultiplier", 1));
   this->exp_share_multiplier = this->config_json->get_float("BBEXPShareMultiplier", 0.5f);
   this->server_global_drop_rate_multiplier = this->config_json->get_float("ServerGlobalDropRateMultiplier", 1.0f);
 

src/ServerState.hh

@@ -270,6 +270,7 @@ struct ServerState : public std::enable_shared_from_this<ServerState> {
   QuestF960Result quest_F960_failure_results;
   float bb_global_exp_multiplier = 1.0f;
   int64_t dc_v2_exp_multiplier = 1;
+  int64_t gc_v3_exp_multiplier = 1;
   float exp_share_multiplier = 0.5f;
   float server_global_drop_rate_multiplier = 1.0f;
 

system/client-functions/PsoPeepsGCV3EXP_enabled.s

@@ -0,0 +1,14 @@
+.meta visibility="menu"
+.meta key="PsoPeepsGCV3EXP_enabled"
+.meta name="GC XP"
+.meta client_flag="0x0000200000000000"
+.meta description="Enables server-scaled GC V3 EXP boost. Server applies the correct Episode 1 or Episode 2 table."
+
+.versions 3OE2 3OJ5
+
+entry_ptr:
+reloc0:
+  .offsetof start
+
+start:
+  blr