From ee80f14d853a732f8b33deb034a143a34d8e4d0e Mon Sep 17 00:00:00 2001
From: ragnarok-clanker <ragnarok-clanker>
Date: Sun, 1 Nov 2026 14:12:45 +0000
Subject: [PATCH] Decompile fn_21581 (CGameMode::ReceiveSkillUpdate)

Batch #9478 by meitogi: 0 byte-identical, 1 confirmed by peer review.

- fn_21581 CGameMode::ReceiveSkillUpdate: logic confirmed by peer review

Peer-reviewed-by: ragnarok-clanker, secret, Toshiro
Accepted without human review: peers confirmed the logic ("same" ahead by at least 3, with 70% of the votes).
---
 Source/Client/Mode/CGameMode.h  |  4 +++
 Source/Client/Mode/GameMode.cpp | 44 +++++++++++++++++++++++++++++++++
 2 files changed, 48 insertions(+)

diff --git a/Source/Client/Mode/CGameMode.h b/Source/Client/Mode/CGameMode.h
index 2406749c..cdfb49d8 100644
--- a/Source/Client/Mode/CGameMode.h
+++ b/Source/Client/Mode/CGameMode.h
@@ -350,6 +350,10 @@ public:
   void OpenActorMenu(const ActorPickInfo* pick, int handled);
   int HandleActorPick(ActorPickInfo* pick, int result);
   void ReceiveSkillList(int packetType, const std::vector<SkillListEntry>& skills);
+  void ShowActorNameBalloon(std::uint32_t id);
+  void ReceiveSkillUpdate(
+    std::uint16_t id, std::int16_t level, std::int16_t spCost, unsigned char upgradable, std::int16_t range, int type, std::int16_t unknown
+  );
   std::uint32_t FindUnknown01AC(std::uint32_t key);
   std::string ActorName(std::uint32_t id);
   std::uint32_t ActorNameColor(int job, std::uint32_t aid);
diff --git a/Source/Client/Mode/GameMode.cpp b/Source/Client/Mode/GameMode.cpp
index caf8988f..2161cc96 100644
--- a/Source/Client/Mode/GameMode.cpp
+++ b/Source/Client/Mode/GameMode.cpp
@@ -3905,6 +3905,50 @@ void CGameMode::ReceiveSkillList(int packetType, const std::vector<SkillListEntr
   g_equipmentPropertiesMgr->RefreshPretend();
 }
 
+// OFFSET: 0x00D07250
+// FUNCTION: fn_21581
+void CGameMode::ReceiveSkillUpdate(
+  std::uint16_t id, std::int16_t level, std::int16_t spCost, unsigned char upgradable, std::int16_t range, int type, std::int16_t unknown
+) {
+  *reinterpret_cast<int*>(&this->unknown_0100[0x0C]) = 0;
+
+  ClientSkills client{
+    g_session.m_skillBundle,
+    g_session.m_homunSkills,
+    g_session.m_mercSkills,
+    g_session.m_additionalSkills,
+    reinterpret_cast<const int&>(g_session.m_jobFlags),
+    g_activeSkillEffects
+  };
+  CSkillInfo skill = client.Lookup(id);
+  skill.level = level;
+  skill.unknown_0014 = spCost;
+  skill.unknown_0018 = upgradable;
+  skill.unknown_001C = range;
+  skill.unknown_000C = type;
+  skill.unknown_0030 = unknown;
+  skill.id = id;
+
+  if (g_session.IsHomunculusSkill(id)) {
+    g_session.UpdateHomunSkill(skill, 1);
+  } else if (g_session.IsMercenarySkill(id)) {
+    g_session.UpdateMercSkill(skill, 1);
+  } else {
+    const SkillUseLevels levels{
+      g_session.m_skillBundle.unknown_0064, *reinterpret_cast<const std::vector<int>*>(g_session.unknown_0710), g_session.m_homunSkillLevels
+    };
+    SkillWindows windows{g_windowMgr.window_02C4, g_windowMgr.window_01E8, *reinterpret_cast<WindowManagerWindows*>(&g_windowMgr)};
+    client.Update(skill, 1, 1, *g_session.m_hotkeyScript, levels, windows);
+  }
+
+  if (g_equipmentPropertiesMgr == nullptr) {
+    g_equipmentPropertiesMgr = new (std::nothrow) EquipmentProperties::CEquipmentPropertiesMgr;
+  }
+  g_equipmentPropertiesMgr->RefreshPretend();
+}
+
+// OFFSET: 0x00CDB910
+
 // OFFSET: 0x00CE2880
 
 // OFFSET: 0x00CDD6B0