Merge pull request #11340 from Ghommie/Ghommie-cit605

Porting movespeed modifiers code updates.

code/__DEFINES/movespeed_modification.dm

@@ -17,6 +17,9 @@
 //ids
 
 #define MOVESPEED_ID_MOB_WALK_RUN_CONFIG_SPEED			"MOB_WALK_RUN"
+#define MOVESPEED_ID_MOB_GRAB_STATE						"MOB_GRAB_STATE"
+#define MOVESPEED_ID_MOB_EQUIPMENT						"MOB_EQUIPMENT"
+#define MOVESPEED_ID_MOB_GRAVITY						"MOB_GRAVITY"
 #define MOVESPEED_ID_CONFIG_SPEEDMOD					"MOB_CONFIG_MODIFIER"
 
 #define MOVESPEED_ID_SLIME_REAGENTMOD					"SLIME_REAGENT_MODIFIER"
@@ -28,6 +31,7 @@
 #define MOVESPEED_ID_TARANTULA_WEB						"TARANTULA_WEB"
 
 #define MOVESPEED_ID_LIVING_TURF_SPEEDMOD				"LIVING_TURF_SPEEDMOD"
+#define MOVESPEED_ID_LIVING_LIMBLESS					"LIVING_LIMBLESS"
 
 #define MOVESPEED_ID_CARBON_SOFTCRIT					"CARBON_SOFTCRIT"
 #define MOVESPEED_ID_CARBON_OLDSPEED					"CARBON_DEPRECATED_SPEED"
@@ -59,15 +63,19 @@
 #define MOVESPEED_ID_HUMAN_CARRYING                     "HUMAN_CARRY"
 #define MOVESPEED_ID_SHRINK_RAY							"SHRUNKEN_SPEED_MODIFIER"
 
-#define MOVESPEED_ID_TASED_STATUS						"TASED"
-
 #define MOVESPEED_ID_SLAUGHTER                          "SLAUGHTER"
 
 #define MOVESPEED_ID_CYBER_THRUSTER						"CYBER_IMPLANT_THRUSTER"
 #define MOVESPEED_ID_JETPACK							"JETPACK"
 
-#define MOVESPEED_ID_SHOVE 								"SHOVE"
-
 #define MOVESPEED_ID_MKULTRA							"MKULTRA"
 
-#define MOVESPEED_ID_ELECTROSTAFF						"ELECTROSTAFF"
+#define MOVESPEED_ID_TASED_STATUS						"TASED"
+#define MOVESPEED_ID_ELECTROSTAFF						"ELECTROSTAFF"
+
+#define MOVESPEED_ID_SHOVE 								"SHOVE"
+#define MOVESPEED_ID_FAT                                "FAT"
+#define MOVESPEED_ID_COLD                               "COLD"
+#define MOVESPEED_ID_HUNGRY                             "HUNGRY"
+#define MOVESPEED_ID_DAMAGE_SLOWDOWN                    "DAMAGE"
+#define MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING				"FLYING"

code/datums/martial/cqc.dm

@@ -119,7 +119,7 @@
 		D.grabbedby(A, 1)
 		if(old_grab_state == GRAB_PASSIVE)
 			D.drop_all_held_items()
-			A.grab_state = GRAB_AGGRESSIVE //Instant agressive grab if on grab intent
+			A.setGrabState(GRAB_AGGRESSIVE) //Instant agressive grab if on grab intent
 			log_combat(A, D, "grabbed", addition="aggressively")
 			D.visible_message("<span class='warning'>[A] violently grabs [D]!</span>", \
 								"<span class='userdanger'>[A] violently grabs you!</span>")
@@ -185,7 +185,7 @@
 		D.SetSleeping(400)
 		restraining = FALSE
 		if(A.grab_state < GRAB_NECK)
-			A.grab_state = GRAB_NECK
+			A.setGrabState(GRAB_NECK)
 	else
 		restraining = FALSE
 		return FALSE

code/datums/martial/psychotic_brawl.dm

@@ -34,10 +34,10 @@
 						log_combat(A, D, "grabbed", addition="aggressively")
 						D.visible_message("<span class='warning'>[A] violently grabs [D]!</span>", \
 						  "<span class='userdanger'>[A] violently grabs you!</span>")
-						A.grab_state = GRAB_AGGRESSIVE //Instant aggressive grab
+						A.setGrabState(GRAB_AGGRESSIVE) //Instant aggressive grab
 					else
 						log_combat(A, D, "grabbed", addition="passively")
-						A.grab_state = GRAB_PASSIVE
+						A.setGrabState(GRAB_PASSIVE)
 		if(4)
 			A.do_attack_animation(D, ATTACK_EFFECT_PUNCH)
 			atk_verb = "headbutts"

code/datums/martial/sleeping_carp.dm

@@ -115,7 +115,7 @@
 		D.grabbedby(A, 1)
 		if(old_grab_state  == GRAB_PASSIVE)
 			D.drop_all_held_items()
-			A.grab_state = GRAB_AGGRESSIVE //Instant agressive grab if on grab intent
+			A.setGrabState(GRAB_AGGRESSIVE) //Instant agressive grab if on grab intent
 			log_combat(A, D, "grabbed", addition="aggressively")
 			D.visible_message("<span class='warning'>[A] violently grabs [D]!</span>", \
 			  "<span class='userdanger'>[A] violently grabs you!</span>")

code/game/area/areas.dm

@@ -514,39 +514,6 @@ GLOBAL_LIST_EMPTY(teleportlocs)
 /client/proc/ResetAmbiencePlayed()
 	played = FALSE
 
-/atom/proc/has_gravity(turf/T)
-	if(!T || !isturf(T))
-		T = get_turf(src)
-
-	if(!T)
-		return 0
-
-	var/list/forced_gravity = list()
-	SEND_SIGNAL(src, COMSIG_ATOM_HAS_GRAVITY, T, forced_gravity)
-	if(!forced_gravity.len)
-		SEND_SIGNAL(T, COMSIG_TURF_HAS_GRAVITY, src, forced_gravity)
-	if(forced_gravity.len)
-		var/max_grav
-		for(var/i in forced_gravity)
-			max_grav = max(max_grav, i)
-		if(max_grav)
-			return max_grav
-
-	if(isspaceturf(T)) // Turf never has gravity
-		return 0
-
-	var/area/A = get_area(T)
-	if(A.has_gravity) // Areas which always has gravity
-		return A.has_gravity
-	else
-		// There's a gravity generator on our z level
-		if(GLOB.gravity_generators["[T.z]"])
-			var/max_grav = 0
-			for(var/obj/machinery/gravity_generator/main/G in GLOB.gravity_generators["[T.z]"])
-				max_grav = max(G.setting,max_grav)
-			return max_grav
-	return SSmapping.level_trait(T.z, ZTRAIT_GRAVITY)
-
 /area/proc/setup(a_name)
 	name = a_name
 	power_equip = FALSE

code/game/atoms.dm

@@ -918,3 +918,49 @@ Proc for attack log creation, because really why not
 		if(!(material_flags & MATERIAL_NO_EFFECTS))
 			custom_material.on_applied(src, materials[custom_material] * multiplier * material_modifier, material_flags)
 		custom_materials[custom_material] += materials[x] * multiplier
+
+/**
+  * Returns true if this atom has gravity for the passed in turf
+  *
+  * Sends signals COMSIG_ATOM_HAS_GRAVITY and COMSIG_TURF_HAS_GRAVITY, both can force gravity with
+  * the forced gravity var
+  *
+  * Gravity situations:
+  * * No gravity if you're not in a turf
+  * * No gravity if this atom is in is a space turf
+  * * Gravity if the area it's in always has gravity
+  * * Gravity if there's a gravity generator on the z level
+  * * Gravity if the Z level has an SSMappingTrait for ZTRAIT_GRAVITY
+  * * otherwise no gravity
+  */
+/atom/proc/has_gravity(turf/T)
+	if(!T || !isturf(T))
+		T = get_turf(src)
+
+	if(!T)
+		return 0
+
+	var/list/forced_gravity = list()
+	SEND_SIGNAL(src, COMSIG_ATOM_HAS_GRAVITY, T, forced_gravity)
+	if(!forced_gravity.len)
+		SEND_SIGNAL(T, COMSIG_TURF_HAS_GRAVITY, src, forced_gravity)
+	if(forced_gravity.len)
+		var/max_grav
+		for(var/i in forced_gravity)
+			max_grav = max(max_grav, i)
+		return max_grav
+
+	if(isspaceturf(T)) // Turf never has gravity
+		return 0
+
+	var/area/A = get_area(T)
+	if(A.has_gravity) // Areas which always has gravity
+		return A.has_gravity
+	else
+		// There's a gravity generator on our z level
+		if(GLOB.gravity_generators["[T.z]"])
+			var/max_grav = 0
+			for(var/obj/machinery/gravity_generator/main/G in GLOB.gravity_generators["[T.z]"])
+				max_grav = max(G.setting,max_grav)
+			return max_grav
+	return SSmapping.level_trait(T.z, ZTRAIT_GRAVITY)

code/game/atoms_movable.dm

@@ -131,7 +131,7 @@
 			return FALSE
 		// Are we trying to pull something we are already pulling? Then enter grab cycle and end.
 		if(AM == pulling)
-			grab_state = state
+			setGrabState(state)
 			if(istype(AM,/mob/living))
 				var/mob/living/AMob = AM
 				AMob.grabbedby(src)
@@ -142,7 +142,7 @@
 		AM.pulledby.stop_pulling() //an object can't be pulled by two mobs at once.
 	pulling = AM
 	AM.pulledby = src
-	grab_state = state
+	setGrabState(state)
 	if(ismob(AM))
 		var/mob/M = AM
 		log_combat(src, M, "grabbed", addition="passive grab")
@@ -155,7 +155,7 @@
 		pulling.pulledby = null
 		var/mob/living/ex_pulled = pulling
 		pulling = null
-		grab_state = 0
+		setGrabState(0)
 		if(isliving(ex_pulled))
 			var/mob/living/L = ex_pulled
 			L.update_mobility()// mob gets up if it was lyng down in a chokehold
@@ -563,6 +563,11 @@
 		return FALSE
 	return TRUE
 
+/// Updates the grab state of the movable
+/// This exists to act as a hook for behaviour
+/atom/movable/proc/setGrabState(newstate)
+	grab_state = newstate
+
 /obj/item/proc/do_pickup_animation(atom/target)
 	set waitfor = FALSE
 	if(!istype(loc, /turf))

code/game/objects/items.dm

@@ -377,6 +377,7 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 		qdel(src)
 	item_flags &= ~IN_INVENTORY
 	SEND_SIGNAL(src, COMSIG_ITEM_DROPPED,user)
+	user.update_equipment_speed_mods()
 
 // called just as an item is picked up (loc is not yet changed)
 /obj/item/proc/pickup(mob/user)
@@ -422,6 +423,7 @@ GLOBAL_VAR_INIT(rpg_loot_items, FALSE)
 		if(item_action_slot_check(slot, user, A)) //some items only give their actions buttons when in a specific slot.
 			A.Grant(user)
 	item_flags |= IN_INVENTORY
+	user.update_equipment_speed_mods()
 
 //sometimes we only want to grant the item's action if it's equipped in a specific slot.
 /obj/item/proc/item_action_slot_check(slot, mob/user, datum/action/A)

code/modules/mob/living/carbon/carbon_movement.dm

@@ -1,15 +1,3 @@
-/mob/living/carbon/movement_delay()
-	. = ..()
-	. += grab_state * 3 //can't go fast while grabbing something.
-
-	if(!get_leg_ignore()) //ignore the fact we lack legs
-		var/leg_amount = get_num_legs()
-		. += 6 - 3*leg_amount //the fewer the legs, the slower the mob
-		if(!leg_amount)
-			. += 6 - 3*get_num_arms() //crawling is harder with fewer arms
-		if(legcuffed)
-			. += legcuffed.slowdown
-
 /mob/living/carbon/slip(knockdown_amount, obj/O, lube)
 	if(movement_type & FLYING && !(lube & FLYING_DOESNT_HELP))
 		return FALSE

code/modules/mob/living/carbon/human/human.dm

@@ -948,6 +948,22 @@
 	if(is_type_in_typecache(active_item, GLOB.shove_disarming_types))
 		visible_message("<span class='warning'>[src.name] regains their grip on \the [active_item]!</span>", "<span class='warning'>You regain your grip on \the [active_item]</span>", null, COMBAT_MESSAGE_RANGE)
 
+/mob/living/carbon/human/updatehealth()
+	. = ..()
+
+	if(HAS_TRAIT(src, TRAIT_IGNORESLOWDOWN))
+		remove_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN)
+		remove_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING)
+		return
+	var/stambufferinfluence = (bufferedstam*(100/stambuffer))*0.2 //CIT CHANGE - makes stamina buffer influence movedelay
+	var/health_deficiency = ((100 + stambufferinfluence) - health + (getStaminaLoss()*0.75))//CIT CHANGE - reduces the impact of staminaloss and makes stamina buffer influence it
+	if(health_deficiency >= 40)
+		add_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN, override = TRUE, multiplicative_slowdown = ((health_deficiency-39) / 75), blacklisted_movetypes = FLOATING|FLYING)
+		add_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING, override = TRUE, multiplicative_slowdown = ((health_deficiency-39) / 25), movetypes = FLOATING)
+	else
+		remove_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN)
+		remove_movespeed_modifier(MOVESPEED_ID_DAMAGE_SLOWDOWN_FLYING)
+
 /mob/living/carbon/human/do_after_coefficent()
 	. = ..()
 	. *= physiology.do_after_speed

code/modules/mob/living/carbon/human/human_movement.dm

@@ -9,8 +9,8 @@
 
 /mob/living/carbon/human/movement_delay()
 	. = ..()
-	if(dna && dna.species)
+	if (m_intent == MOVE_INTENT_WALK && HAS_TRAIT(src, TRAIT_SPEEDY_STEP))
-		. += dna.species.movement_delay(src)
+		. -= 1.5
 
 /mob/living/carbon/human/slip(knockdown_amount, obj/O, lube)
 	if(HAS_TRAIT(src, TRAIT_NOSLIPALL))

code/modules/mob/living/carbon/human/inventory.dm

@@ -145,6 +145,12 @@
 
 	return not_handled //For future deeper overrides
 
+/mob/living/carbon/human/equipped_speed_mods()
+	. = ..()
+	for(var/sloties in get_all_slots())
+		var/obj/item/thing = sloties
+		. += thing?.slowdown
+
 /mob/living/carbon/human/doUnEquip(obj/item/I, force, newloc, no_move, invdrop = TRUE)
 	var/index = get_held_index_of_item(I)
 	. = ..() //See mob.dm for an explanation on this and some rage about people copypasting instead of calling ..() like they should.

code/modules/mob/living/carbon/human/species.dm

@@ -1296,12 +1296,14 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		if(H.overeatduration < 100)
 			to_chat(H, "<span class='notice'>You feel fit again!</span>")
 			REMOVE_TRAIT(H, TRAIT_FAT, OBESITY)
+			H.remove_movespeed_modifier(MOVESPEED_ID_FAT)
 			H.update_inv_w_uniform()
 			H.update_inv_wear_suit()
 	else
 		if(H.overeatduration >= 100)
 			to_chat(H, "<span class='danger'>You suddenly feel blubbery!</span>")
 			ADD_TRAIT(H, TRAIT_FAT, OBESITY)
+			H.add_movespeed_modifier(MOVESPEED_ID_FAT, multiplicative_slowdown = 1.5)
 			H.update_inv_w_uniform()
 			H.update_inv_wear_suit()
 
@@ -1352,6 +1354,15 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 			to_chat(H, "<span class='notice'>You no longer feel vigorous.</span>")
 		H.metabolism_efficiency = 1
 
+	//Hunger slowdown for if mood isn't enabled
+	if(CONFIG_GET(flag/disable_human_mood))
+		if(!HAS_TRAIT(H, TRAIT_NOHUNGER))
+			var/hungry = (500 - H.nutrition) / 5 //So overeat would be 100 and default level would be 80
+			if(hungry >= 70)
+				H.add_movespeed_modifier(MOVESPEED_ID_HUNGRY, override = TRUE, multiplicative_slowdown = (hungry / 50))
+			else
+				H.remove_movespeed_modifier(MOVESPEED_ID_HUNGRY)
+
 	switch(H.nutrition)
 		if(NUTRITION_LEVEL_FULL to INFINITY)
 			H.throw_alert("nutrition", /obj/screen/alert/fat)
@@ -1401,59 +1412,6 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 	H.hair_style = "Bald"
 	H.update_hair()
 
-////////////////
-// MOVE SPEED //
-////////////////
-
-/datum/species/proc/movement_delay(mob/living/carbon/human/H)
-	. = 0	//We start at 0.
-	var/flight = 0	//Check for flight and flying items
-	var/gravity = 0
-	if(H.movement_type & FLYING)
-		flight = 1
-
-	gravity = H.has_gravity()
-
-	if (H.m_intent == MOVE_INTENT_WALK && HAS_TRAIT(H, TRAIT_SPEEDY_STEP))
-		. -= 1.5
-
-	if(!HAS_TRAIT(H, TRAIT_IGNORESLOWDOWN) && gravity)
-		if(H.wear_suit)
-			. += H.wear_suit.slowdown
-		if(H.shoes)
-			. += H.shoes.slowdown
-		if(H.back)
-			. += H.back.slowdown
-		for(var/obj/item/I in H.held_items)
-			if(I.item_flags & SLOWS_WHILE_IN_HAND)
-				. += I.slowdown
-		var/stambufferinfluence = (H.bufferedstam*(100/H.stambuffer))*0.2 //CIT CHANGE - makes stamina buffer influence movedelay
-		var/health_deficiency = ((100 + stambufferinfluence) - H.health + (H.getStaminaLoss()*0.75))//CIT CHANGE - reduces the impact of staminaloss on movement speed and makes stamina buffer influence movedelay
-		if(health_deficiency >= 40)
-			if(flight)
-				. += ((health_deficiency-39) / 75) // CIT CHANGE - adds -39 to health deficiency penalty to make the transition to low health movement a little less jarring
-			else
-				. += ((health_deficiency-39) / 25) // CIT CHANGE - ditto
-		if(CONFIG_GET(flag/disable_human_mood))
-			var/hungry = (500 - H.nutrition) / 5 //So overeat would be 100 and default level would be 80
-			if((hungry >= 70) && !flight) //Being hungry will still allow you to use a flightsuit/wings.
-				. += hungry / 50
-
-		//Moving in high gravity is very slow (Flying too)
-		if(gravity > STANDARD_GRAVITY)
-			var/grav_force = min(gravity - STANDARD_GRAVITY,3)
-			. += 1 + grav_force
-
-		if(HAS_TRAIT(H, TRAIT_FAT))
-			. += (1.5 - flight)
-		if(H.bodytemperature < BODYTEMP_COLD_DAMAGE_LIMIT && !HAS_TRAIT(H, TRAIT_RESISTCOLD))
-			. += (BODYTEMP_COLD_DAMAGE_LIMIT - H.bodytemperature) / COLD_SLOWDOWN_FACTOR
-	return .
-
-//////////////////
-// ATTACK PROCS //
-//////////////////
-
 //////////////////
 // ATTACK PROCS //
 //////////////////
@@ -2070,6 +2028,8 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 		SEND_SIGNAL(H, COMSIG_CLEAR_MOOD_EVENT, "cold")
 		SEND_SIGNAL(H, COMSIG_ADD_MOOD_EVENT, "hot", /datum/mood_event/hot)
 
+		H.remove_movespeed_modifier(MOVESPEED_ID_COLD)
+
 		var/burn_damage
 		var/firemodifier = H.fire_stacks / 50
 		if (H.on_fire)
@@ -2085,6 +2045,8 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 	else if(H.bodytemperature < BODYTEMP_COLD_DAMAGE_LIMIT && !HAS_TRAIT(H, TRAIT_RESISTCOLD))
 		SEND_SIGNAL(H, COMSIG_CLEAR_MOOD_EVENT, "hot")
 		SEND_SIGNAL(H, COMSIG_ADD_MOOD_EVENT, "cold", /datum/mood_event/cold)
+		//Sorry for the nasty oneline but I don't want to assign a variable on something run pretty frequently
+		H.add_movespeed_modifier(MOVESPEED_ID_COLD, override = TRUE, multiplicative_slowdown = ((BODYTEMP_COLD_DAMAGE_LIMIT - H.bodytemperature) / COLD_SLOWDOWN_FACTOR))
 		switch(H.bodytemperature)
 			if(200 to BODYTEMP_COLD_DAMAGE_LIMIT)
 				H.apply_damage(COLD_DAMAGE_LEVEL_1*coldmod*H.physiology.cold_mod, BURN)
@@ -2094,6 +2056,7 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 				H.apply_damage(COLD_DAMAGE_LEVEL_3*coldmod*H.physiology.cold_mod, BURN)
 
 	else
+		H.remove_movespeed_modifier(MOVESPEED_ID_COLD)
 		SEND_SIGNAL(H, COMSIG_CLEAR_MOOD_EVENT, "cold")
 		SEND_SIGNAL(H, COMSIG_CLEAR_MOOD_EVENT, "hot")
 

code/modules/mob/living/living.dm

@@ -727,6 +727,7 @@
 	return name
 
 /mob/living/update_gravity(has_gravity,override = 0)
+	. = ..()
 	if(!SSticker.HasRoundStarted())
 		return
 	if(has_gravity)

code/modules/mob/living/living_defense.dm

@@ -250,7 +250,7 @@
 				return 0
 			if(user.voremode && user.grab_state == GRAB_AGGRESSIVE)
 				return 0
-		user.grab_state++
+		user.setGrabState(user.grab_state + 1)
 		switch(user.grab_state)
 			if(GRAB_AGGRESSIVE)
 				var/add_log = ""

code/modules/mob/living/living_mobility.dm

@@ -152,4 +152,17 @@
 	if(CHECK_MOBILITY(src, MOBILITY_MOVE) && !intentionalresting && canstand_involuntary && iscarbon(src) && client?.prefs?.autostand)//CIT CHANGE - adds autostanding as a preference
 		addtimer(CALLBACK(src, .proc/resist_a_rest, TRUE), 0) //CIT CHANGE - ditto
 
+	// Movespeed mods based on arms/legs quantity
+	if(!get_leg_ignore())
+		var/limbless_slowdown = 0
+		// These checks for <2 should be swapped out for something else if we ever end up with a species with more than 2
+		if(has_legs < 2)
+			limbless_slowdown += 6 - (has_legs * 3)
+			if(!has_legs && has_arms < 2)
+				limbless_slowdown += 6 - (has_arms * 3)
+		if(limbless_slowdown)
+			add_movespeed_modifier(MOVESPEED_ID_LIVING_LIMBLESS, update=TRUE, priority=100, override=TRUE, multiplicative_slowdown=limbless_slowdown, movetypes=GROUND)
+		else
+			remove_movespeed_modifier(MOVESPEED_ID_LIVING_LIMBLESS, update=TRUE)
+
 	return mobility_flags

code/modules/mob/mob.dm

@@ -952,3 +952,25 @@ GLOBAL_VAR_INIT(exploit_warn_spam_prevention, 0)
 /mob/setMovetype(newval)
 	. = ..()
 	update_movespeed(FALSE)
+
+/// Updates the grab state of the mob and updates movespeed
+/mob/setGrabState(newstate)
+	. = ..()
+	if(grab_state == GRAB_PASSIVE)
+		remove_movespeed_modifier(MOVESPEED_ID_MOB_GRAB_STATE, update=TRUE)
+	else
+		add_movespeed_modifier(MOVESPEED_ID_MOB_GRAB_STATE, update=TRUE, priority=100, override=TRUE, multiplicative_slowdown=grab_state*3, blacklisted_movetypes=FLOATING)
+
+/mob/proc/update_equipment_speed_mods()
+	var/speedies = equipped_speed_mods()
+	if(!speedies)
+		remove_movespeed_modifier(MOVESPEED_ID_MOB_EQUIPMENT, update=TRUE)
+	else
+		add_movespeed_modifier(MOVESPEED_ID_MOB_EQUIPMENT, update=TRUE, priority=100, override=TRUE, multiplicative_slowdown=speedies, blacklisted_movetypes=FLOATING)
+
+/// Gets the combined speed modification of all worn items
+/// Except base mob type doesnt really wear items
+/mob/proc/equipped_speed_mods()
+	for(var/obj/item/I in held_items)
+		if(I.item_flags & SLOWS_WHILE_IN_HAND)
+			. += I.slowdown

code/modules/mob/mob_movement.dm

@@ -249,8 +249,12 @@
 /mob/proc/slip(s_amount, w_amount, obj/O, lube)
 	return
 
-/mob/proc/update_gravity()
+/mob/proc/update_gravity(has_gravity, override=FALSE)
-	return
+	var/speed_change = max(0, has_gravity - STANDARD_GRAVITY)
+	if(!speed_change)
+		remove_movespeed_modifier(MOVESPEED_ID_MOB_GRAVITY, update=TRUE)
+	else
+		add_movespeed_modifier(MOVESPEED_ID_MOB_GRAVITY, update=TRUE, priority=100, override=TRUE, multiplicative_slowdown=speed_change, blacklisted_movetypes=FLOATING)
 
 //bodypart selection - Cyberboss
 //8 toggles through head - eyes - mouth