feat: duck spam (#448)

* feat: duck spam

* Match default duck speed, rename cvar & add to .cfg

---------

Co-authored-by: Vauff <mctehkitti@gmail.com>

Author: 2vg

cfg/cs2fixes/cs2fixes.cfg

@@ -7,7 +7,7 @@ cs2f_stopsound_enable 			0		// Whether to enable stopsound
 cs2f_noblock_enable 			0		// Whether to use player noblock, which sets debris collision on every player
 cs2f_noblock_grenades			0		// Whether to use noblock on grenade projectiles
 cs2f_block_team_messages 		0		// Whether to block team join messages
-cs2f_movement_unlocker_enable	0		// Whether to enable movement unlocker
+cs2f_movement_unlocker_enable	0		// Whether to enable movement unlocker, clients will not predict
 cs2f_use_old_push 				0		// Whether to use the old CSGO trigger_push behavior (Necessary for surf and other modes that heavily use ported pushes)
 cs2f_hide_enable 				0		// Whether to enable hide (WARNING: randomly crashes clients since 2023-12-13 CS2 update)
 cs2f_votemanager_enable			0		// Whether to enable votemanager features such as map vote fix, nominations, RTV and extends
@@ -26,6 +26,7 @@ cs2f_fix_game_bans				0		// Whether to fix CS2 game bans spreading to all new jo
 cs2f_free_armor					0		// Whether kevlar (1+) and/or helmet (2) are given automatically
 cs2f_block_particle_msgs		0		// Whether to block CUserMsg_ParticleManager messages to fix lag/crashes, experimental
 cs2f_disable_setmodel			0		// Whether to disable SetModel usage from maps (custom input, cs_script function)
+cs2f_allow_duck_spam			0		// Whether to allow duck spamming by removing the duck slowdown, clients will only partially predict [0 = disabled, 1 = both teams, 2 = T only, 3 = CT only]
 
 cs2f_beacon_particle			"particles/cs2fixes/admin_beacon.vpcf" // .vpcf file to be precached and used for player beacon
 cs2f_motd_url					""		// Server MOTD URL, shows up as a "Server Website" button in scoreboard

src/detours.cpp

@@ -538,6 +538,8 @@ void* FASTCALL Detour_CNavMesh_GetNearestNavArea(int64_t unk1, float* unk2, unsi
 	return CNavMesh_GetNearestNavArea(unk1, unk2, unk3, unk4, unk5, unk6, unk7);
 }
 
+CConVar<int> g_cvarAllowDuckSpam("cs2f_allow_duck_spam", FCVAR_NONE, "Whether to allow duck spamming by removing the duck slowdown, clients will only partially predict [0 = disabled, 1 = both teams, 2 = T only, 3 = CT only]", 0, true, 0, true, CS_TEAM_CT);
+
 void FASTCALL Detour_ProcessMovement(CCSPlayer_MovementServices* pThis, void* pMove)
 {
 	CCSPlayerPawn* pPawn = pThis->GetPawn();
@@ -550,6 +552,11 @@ void FASTCALL Detour_ProcessMovement(CCSPlayer_MovementServices* pThis, void* pM
 	if (!pController || !pController->IsConnected())
 		return ProcessMovement(pThis, pMove);
 
+	int iAllowDuckSpam = g_cvarAllowDuckSpam.Get();
+
+	if ((iAllowDuckSpam == 1 || pPawn->m_iTeamNum() == iAllowDuckSpam) && pThis->m_flDuckSpeed() != 8.0f)
+		pThis->m_flDuckSpeed = 8.0f;
+
 	float flSpeedMod = pController->GetZEPlayer()->GetSpeedMod();
 
 	if (flSpeedMod == 1.f)

src/patches.cpp

@@ -36,7 +36,7 @@ CMemPatch g_CommonPatches[] =
 		CMemPatch("SetSchemaHammerUniqueId", "SetSchemaHammerUniqueId"),
 };
 
-CConVar<bool> cs2f_movement_unlocker_enable("cs2f_movement_unlocker_enable", FCVAR_NONE, "Whether to enable movement unlocker", false,
+CConVar<bool> cs2f_movement_unlocker_enable("cs2f_movement_unlocker_enable", FCVAR_NONE, "Whether to enable movement unlocker, clients will not predict", false,
 											[](CConVar<bool>* cvar, CSplitScreenSlot slot, const bool* new_val, const bool* old_val) {
 												// Movement unlocker is always the first patch
 												if (*new_val)