Fix #817 - Tank Rocks on control pass

Author: SirPlease

addons/sourcemod/gamedata/l4d2_fix_tank_rock_handoff.txt

@@ -0,0 +1,15 @@
+"Games"
+{
+	"left4dead2"
+	{
+		"Signatures"
+		{
+			"CThrow::OnStunned"
+			{
+				"library"	"server"
+				"linux"		"@_ZN6CThrow9OnStunnedEf"
+				"windows"	"\x55\x8B\xEC\xF3\x0F\x10\x05\x2A\x2A\x2A\x2A\x56"
+			}
+		}
+	}
+}

addons/sourcemod/plugins/fixes/l4d2_fix_tank_rock_handoff.smx

@@ -0,0 +1,88 @@
+#pragma semicolon 1
+#pragma newdecls required
+
+#include <sourcemod>
+#include <left4dhooks>
+
+#define PLUGIN_VERSION "1.0"
+#define GAMEDATA_FILE  "l4d2_fix_tank_rock_handoff"
+
+Handle g_hCThrow_OnStunned = null;
+
+public Plugin myinfo =
+{
+	name = "[L4D2] Fix Tank Rock Stuck",
+	author = "Sir",
+	description = "Cancels tank rocks that are in the middle of a throw when passing to another player/AI.",
+	version = PLUGIN_VERSION,
+	url = "https://github.com/SirPlease/L4D2-Competitive-Rework"
+};
+
+public void OnPluginStart()
+{
+	GameData gd = new GameData(GAMEDATA_FILE);
+	if (!gd) SetFailState("Missing gamedata \"" ... GAMEDATA_FILE ... ".txt\"");
+
+	StartPrepSDKCall(SDKCall_Entity);
+	if (!PrepSDKCall_SetFromConf(gd, SDKConf_Signature, "CThrow::OnStunned"))
+	{
+		delete gd;
+		SetFailState("Failed to find signature \"CThrow::OnStunned\"");
+	}
+	PrepSDKCall_AddParameter(SDKType_Float, SDKPass_Plain);
+	g_hCThrow_OnStunned = EndPrepSDKCall();
+	delete gd;
+
+	if (g_hCThrow_OnStunned == null)
+		SetFailState("Failed to prep SDKCall for CThrow::OnStunned");
+
+	HookEvent("player_bot_replace", Event_PlayerBotReplace, EventHookMode_Post);
+	HookEvent("bot_player_replace", Event_BotPlayerReplace, EventHookMode_Post);
+}
+
+/* Covers Player to Player passes (including forced) */
+public void L4D_OnReplaceTank(int oldTank, int newTank)
+{
+	CancelTankThrow(newTank);
+}
+
+/* Covers Player to Bot passes */
+void Event_PlayerBotReplace(Event event, const char[] name, bool dontBroadcast)
+{
+	int bot = GetClientOfUserId(event.GetInt("bot"));
+
+	if (bot > 0 && IsTank(bot))
+		CancelTankThrow(bot);
+}
+
+/* Covers Bot to Player passes (as we do in some plugins) */
+void Event_BotPlayerReplace(Event event, const char[] name, bool dontBroadcast)
+{
+	int player = GetClientOfUserId(event.GetInt("player"));
+
+	if (player > 0 && IsTank(player))
+		CancelTankThrow(player);
+}
+
+void CancelTankThrow(int tank)
+{
+	if (!IsTank(tank))
+		return;
+
+	int ability = GetEntPropEnt(tank, Prop_Send, "m_customAbility");
+	if (ability == -1)
+		return;
+
+	SDKCall(g_hCThrow_OnStunned, ability, 0.0);
+}
+
+bool IsTank(int client)
+{
+	if (client <= 0 || client > MaxClients || IsClientInGame(client))
+		return false;
+
+	if (GetClientTeam(client) != L4D_TEAM_INFECTED)
+		return false;
+
+	return GetEntProp(client, Prop_Send, "m_zombieClass") == L4D2_ZOMBIE_CLASS_TANK;
+}

addons/sourcemod/scripting/l4d2_fix_tank_rock_handoff.sp

@@ -70,6 +70,7 @@ sm plugins load fixes/l4d_fix_stagger_dir.smx
 sm plugins load fixes/l4d2_fix_rocket_pull.smx
 sm plugins load optional/l4d_return_thrown_items.smx
 sm plugins load fixes/l4d_prop_touching_rules.smx
+sm plugins load fixes/l4d2_fix_tank_rock_handoff.smx
 
 // Anti-Cheat.
 sm plugins load optional/l4d2_block_autoaim.smx // Sort of a cheat..?