Assorted performance improvements (#25649)

* Improved efficiency of playsound.

* Improve performance of turf/Enter

* Improve performace of thrown objects.

* Improved performance of /atom/movable/CanPass.

* Improved pipeline destruction performance.

* Apply suggestions from code review

Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>
Signed-off-by: Charlie Nolan <funnyman3595@gmail.com>

---------

Signed-off-by: Charlie Nolan <funnyman3595@gmail.com>
Co-authored-by: FunnyMan3595 (Charlie Nolan) <funnyman@google.com>
Co-authored-by: Luc <89928798+lewcc@users.noreply.github.com>
Co-authored-by: 1080pCat <96908085+1080pCat@users.noreply.github.com>

code/controllers/subsystem/SSthrowing.dm

@@ -243,13 +243,9 @@ SUBSYSTEM_DEF(throwing)
 		return
 	thrownthing.throwing = null
 	if(!hit)
-		for(var/atom/movable/obstacle as anything in get_turf(thrownthing)) //looking for our target on the turf we land on.
-			if(obstacle == target)
-				hit = TRUE
-				thrownthing.throw_impact(obstacle, src)
-				if(QDELETED(thrownthing)) //throw_impact can delete things, such as glasses smashing
-					return //deletion should already be handled by on_thrownthing_qdel()
-				break
+		if(get_turf(target) == get_turf(thrownthing))
+			hit = TRUE
+			thrownthing.throw_impact(target, src)
 		if(!hit)
 			thrownthing.throw_impact(get_turf(thrownthing), src)  // we haven't hit something yet and we still must, let's hit the ground.
 			if(QDELETED(thrownthing)) //throw_impact can delete things, such as glasses smashing

code/game/atoms_movable.dm

@@ -529,9 +529,10 @@
 	return FALSE
 
 /atom/movable/CanPass(atom/movable/mover, turf/target, height=1.5)
-	if(mover in buckled_mobs)
+	// This condition is copied from atom to avoid an extra parent call, because this is a very hot proc.
+	if(!density || !height)
 		return TRUE
-	return ..()
+	return LAZYIN(buckled_mobs, mover)
 
 /atom/movable/proc/get_spacemove_backup()
 	var/atom/movable/dense_object_backup

code/game/sound.dm

@@ -61,25 +61,32 @@ falloff_distance - Distance at which falloff begins. Sound is at peak volume (in
 	var/sound/S = sound(get_sfx(soundin))
 	var/maxdistance = SOUND_RANGE + extrarange
 
-	var/list/listeners = GLOB.player_list
-	if(!ignore_walls) //these sounds don't carry through walls
-		listeners = listeners & hearers(maxdistance, turf_source)
-
-	for(var/P in listeners)
-		var/mob/M = P
-		if(!M || !M.client)
+	var/list/possible_listeners = list()
+	var/list/desired_turfs = list()
+	for(var/mob/P as anything in GLOB.player_list)
+		if(isnull(P) || !P.client)
+			continue
+		var/turf/T = get_turf(P)
+		if(!T || T.z != turf_source.z || get_dist(T, turf_source) > maxdistance)
 			continue
 
-		var/turf/T = get_turf(M) // These checks need to be changed if z-levels are ever further refactored
-		if(!T)
-			continue
-		if(T.z != turf_source.z)
-			continue
+		possible_listeners += P
+		desired_turfs |= T
 
-		var/distance = get_dist(M, turf_source)
+	var/list/listeners = list()
+	if(ignore_walls)
+		listeners = possible_listeners
+	else if(length(possible_listeners))
+		var/list/turf_vis = list()
+		for(var/turf/T as anything in desired_turfs)
+			turf_vis[T] = inLineOfSight(T.x, T.y, turf_source.x, turf_source.y, T.z)
 
-		if(distance <= maxdistance)
-			M.playsound_local(turf_source, soundin, vol, vary, frequency, falloff_exponent, channel, pressure_affected, S, maxdistance, falloff_distance, 1, use_reverb)
+		for(var/mob/P in possible_listeners)
+			if(turf_vis[get_turf(P)])
+				listeners += P
+
+	for(var/mob/M as anything in listeners)
+		M.playsound_local(turf_source, soundin, vol, vary, frequency, falloff_exponent, channel, pressure_affected, S, maxdistance, falloff_distance, 1, use_reverb)
 
 /mob/proc/playsound_local(turf/turf_source, soundin, vol as num, vary, frequency, falloff_exponent = SOUND_FALLOFF_EXPONENT, channel = 0, pressure_affected = TRUE, sound/S, max_distance, falloff_distance = SOUND_DEFAULT_FALLOFF_DISTANCE, distance_multiplier = 1, use_reverb = TRUE)
 	if(!client || !can_hear())

code/game/turfs/turf.dm

@@ -195,16 +195,22 @@
 	// First, make sure it can leave its square
 	if(isturf(mover.loc))
 		// Nothing but border objects stop you from leaving a tile, only one loop is needed
-		for(var/obj/obstacle in mover.loc)
-			if(!obstacle.CheckExit(mover, src) && obstacle != mover && obstacle != forget)
+		// This as anything looks odd, since we check istype shortly after, but it's so we can save an istype check for items, which are far more common than other objects.
+		for(var/obj/obstacle as anything in mover.loc)
+			if(isitem(obstacle) || !istype(obstacle) || obstacle == mover || obstacle == forget)
+				continue
+			if(!obstacle.CheckExit(mover, src))
 				mover.Bump(obstacle, TRUE)
 				return FALSE
 
 	var/list/large_dense = list()
-	//Next, check objects to block entry that are on the border
-	for(var/atom/movable/border_obstacle in src)
+	// Next, check for border obstacles on this turf
+	// Everyting inside a turf is an atom/movable.
+	for(var/atom/movable/border_obstacle as anything in src)
+		if(isitem(border_obstacle) || border_obstacle == forget || isnull(border_obstacle))
+			continue
 		if(border_obstacle.flags & ON_BORDER)
-			if(!border_obstacle.CanPass(mover, mover.loc, 1) && (forget != border_obstacle))
+			if(!border_obstacle.CanPass(mover, mover.loc, 1))
 				mover.Bump(border_obstacle, TRUE)
 				return FALSE
 		else
@@ -215,14 +221,15 @@
 		mover.Bump(src, TRUE)
 		return FALSE
 
-	//Finally, check objects/mobs to block entry that are not on the border
+	// Finally, check objects/mobs that block entry and are not on the border
 	var/atom/movable/tompost_bump
 	var/top_layer = FALSE
-	for(var/atom/movable/obstacle in large_dense)
-		if(!obstacle.CanPass(mover, mover.loc, 1) && (forget != obstacle))
-			if(obstacle.layer > top_layer)
-				tompost_bump = obstacle
-				top_layer = obstacle.layer
+	for(var/atom/movable/obstacle as anything in large_dense)
+		if(obstacle.layer <= top_layer)
+			continue
+		if(!obstacle.CanPass(mover, mover.loc, 1))
+			tompost_bump = obstacle
+			top_layer = obstacle.layer
 	if(tompost_bump)
 		mover.Bump(tompost_bump, TRUE)
 		return FALSE

code/modules/atmospherics/machinery/datum_pipeline.dm

@@ -12,9 +12,14 @@
 
 /datum/pipeline/Destroy()
 	SSair.pipenets -= src
+	var/datum/gas_mixture/ghost = null
 	if(air && air.volume)
-		temporarily_store_air()
+		ghost = air
+		air = null
 	for(var/obj/machinery/atmospherics/pipe/P in members)
+		if(QDELETED(P))
+			continue
+		P.ghost_pipeline = ghost
 		P.parent = null
 	for(var/obj/machinery/atmospherics/A in other_atmosmch)
 		A.nullifyPipenet(src)
@@ -28,13 +33,14 @@
 
 /datum/pipeline/proc/build_pipeline(obj/machinery/atmospherics/base)
 	var/volume = 0
+	var/list/ghost_pipelines = list()
 	if(istype(base, /obj/machinery/atmospherics/pipe))
 		var/obj/machinery/atmospherics/pipe/E = base
 		volume = E.volume
 		members += E
-		if(E.air_temporary)
-			air = E.air_temporary
-			E.air_temporary = null
+		if(E.ghost_pipeline)
+			ghost_pipelines[E.ghost_pipeline] = E.volume
+			E.ghost_pipeline = null
 	else
 		addMachineryMember(base)
 	if(!air)
@@ -59,15 +65,26 @@
 							volume += item.volume
 							item.parent = src
 
-							if(item.air_temporary)
-								air.merge(item.air_temporary)
-								item.air_temporary = null
+							if(item.ghost_pipeline)
+								if(!ghost_pipelines[item.ghost_pipeline])
+									ghost_pipelines[item.ghost_pipeline] = item.volume
+								else
+									ghost_pipelines[item.ghost_pipeline] += item.volume
+								item.ghost_pipeline = null
 					else
 						P.setPipenet(src, borderline)
 						addMachineryMember(P)
 
 			possible_expansions -= borderline
 
+	for(var/datum/gas_mixture/ghost in ghost_pipelines)
+		var/collected_ghost_volume = ghost_pipelines[ghost]
+		var/collected_fraction = collected_ghost_volume / ghost.volume
+
+		var/datum/gas_mixture/ghost_copy = new()
+		ghost_copy.copy_from(ghost)
+		air.merge(ghost_copy.remove_ratio(collected_fraction))
+
 	air.volume = volume
 
 /datum/pipeline/proc/addMachineryMember(obj/machinery/atmospherics/A)
@@ -114,22 +131,6 @@
 /obj/machinery/atmospherics/pipe/addMember(obj/machinery/atmospherics/A)
 	parent.addMember(A, src)
 
-/datum/pipeline/proc/temporarily_store_air()
-	//Update individual gas_mixtures by volume ratio
-
-	for(var/obj/machinery/atmospherics/pipe/member in members)
-		member.air_temporary = new
-		member.air_temporary.volume = member.volume
-
-		member.air_temporary.set_oxygen(air.oxygen() * member.volume / air.volume)
-		member.air_temporary.set_nitrogen(air.nitrogen() * member.volume / air.volume)
-		member.air_temporary.set_toxins(air.toxins() * member.volume / air.volume)
-		member.air_temporary.set_carbon_dioxide(air.carbon_dioxide() * member.volume / air.volume)
-		member.air_temporary.set_sleeping_agent(air.sleeping_agent() * member.volume / air.volume)
-		member.air_temporary.set_agent_b(air.agent_b() * member.volume / air.volume)
-
-		member.air_temporary.set_temperature(air.temperature())
-
 /datum/pipeline/proc/temperature_interact(turf/target, share_volume, thermal_conductivity)
 	var/datum/milla_safe/pipeline_temperature_interact/milla = new()
 	milla.invoke_async(src, target, share_volume, thermal_conductivity)

code/modules/atmospherics/machinery/pipes/pipe.dm

@@ -1,5 +1,5 @@
 /obj/machinery/atmospherics/pipe
-	var/datum/gas_mixture/air_temporary //used when reconstructing a pipeline that broke
+	var/datum/gas_mixture/ghost_pipeline // used when reconstructing a pipeline that broke
 	var/datum/pipeline/parent
 	var/volume = 0
 	force = 20
@@ -23,7 +23,10 @@
 
 /obj/machinery/atmospherics/pipe/Destroy()
 	var/turf/T = get_turf(src)
-	T.blind_release_air(air_temporary)
+	if(ghost_pipeline)
+		var/datum/gas_mixture/ghost_copy = new()
+		ghost_copy.copy_from(ghost_pipeline)
+		T.blind_release_air(ghost_copy.remove(volume / ghost_pipeline.volume))
 
 	for(var/obj/machinery/atmospherics/meter/meter in T)
 		if(meter.target == src)