[DNM][DNM][WIP] Projectile backend code port and update

Ports#54924,  #65061, #59804 from /tg.
adds auxiliary code from /tg to make code work.

code/modules/mob/dead/observer/observer.dm

@@ -166,9 +166,6 @@ GLOBAL_VAR_INIT(observer_default_invisibility, INVISIBILITY_OBSERVER)
 	QDEL_NULL(spawners_menu)
 	return ..()
 
-/mob/dead/CanPass(atom/movable/mover, turf/target)
-	return 1
-
 /*
  * This proc will update the icon of the ghost itself, with hair overlays, as well as the ghost image.
  * Please call update_icon(icon_state) from now on when you want to update the icon_state of the ghost,

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

@@ -53,7 +53,7 @@
 		dna.species.on_hit(P, src)
 
 
-/mob/living/carbon/human/bullet_act(obj/item/projectile/P, def_zone)
+/mob/living/carbon/human/bullet_act(obj/item/projectile/P, def_zone, piercing_hit = FALSE)
 	if(dna && dna.species)
 		var/spec_return = dna.species.bullet_act(P, src)
 		if(spec_return)
@@ -61,7 +61,7 @@
 
 	if(mind) //martial art stuff
 		if(mind.martial_art && mind.martial_art.can_use(src)) //Some martial arts users can deflect projectiles!
-			var/martial_art_result = mind.martial_art.on_projectile_hit(src, P, def_zone)
+			var/martial_art_result = mind.martial_art.on_projectile_hit(src, P, def_zone, piercing_hit)
 			if(!(martial_art_result == BULLET_ACT_HIT))
 				return martial_art_result
 	return ..()

code/modules/mob/living/living_defense.dm

@@ -68,7 +68,7 @@
 		else
 			CRASH("Invalid rediretion mode [redirection_mode]")
 
-/mob/living/bullet_act(obj/item/projectile/P, def_zone)
+/mob/living/bullet_act(obj/item/projectile/P, def_zone, piercing_hit = FALSE)
 	var/totaldamage = P.damage
 	var/final_percent = 0
 	if(P.original != src || P.firer != src) //try to block or reflect the bullet, can't do so when shooting oneself
@@ -81,7 +81,7 @@
 		if(returned & BLOCK_REDIRECTED)
 			return BULLET_ACT_FORCE_PIERCE
 		if(returned & BLOCK_SUCCESS)
-			P.on_hit(src, final_percent, def_zone)
+			P.on_hit(src, final_percent, def_zone, piercing_hit)
 			return BULLET_ACT_BLOCK
 		totaldamage = block_calculate_resultant_damage(totaldamage, returnlist)
 	var/armor = run_armor_check(def_zone, P.flag, null, null, P.armour_penetration, null)

code/modules/mob/living/living_movement.dm

@@ -20,12 +20,10 @@
 /mob/living/proc/update_density()
 	density = !lying && !HAS_TRAIT(src, TRAIT_LIVING_NO_DENSITY)
 
-/mob/living/CanPass(atom/movable/mover, turf/target)
-	if((mover.pass_flags & PASSMOB))
-		return TRUE
-	if(istype(mover, /obj/item/projectile))
-		var/obj/item/projectile/P = mover
-		return !P.can_hit_target(src, P.permutated, src == P.original, TRUE)
+/mob/living/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
+	if(.)
+		return
 	if(mover.throwing)
 		return (!density || lying)
 	if(buckled == mover)
@@ -41,7 +39,7 @@
 	var/mob/living/L = mover		//typecast first, check isliving and only check this if living using short circuit
 	if(isliving(L) && lying && L.lying)		//if we're both lying down and aren't already being thrown/shipped around, don't pass
 		return FALSE
-	return (!density || (isliving(mover)? L.can_move_under_living(src) : !mover.density))
+	return (isliving(mover)? L.can_move_under_living(src) : !mover.density)
 
 /mob/living/toggle_move_intent()
 	. = ..()

code/modules/mob/living/silicon/silicon_defense.dm

@@ -120,7 +120,7 @@
 				"<span class='boldwarning'>You are thrown off of [src]!</span>")
 	flash_act(affect_silicon = 1)
 
-/mob/living/silicon/bullet_act(obj/item/projectile/P, def_zone)
+/mob/living/silicon/bullet_act(obj/item/projectile/P, def_zone, piercing_hit = FALSE)
 	var/totaldamage = P.damage
 	if(P.original != src || P.firer != src) //try to block or reflect the bullet, can't do so when shooting oneself
 		var/list/returnlist = list()
@@ -141,7 +141,7 @@
 				"<span class='boldwarning'>You are knocked off of [src] by the [P]!</span>")
 			unbuckle_mob(M)
 			M.DefaultCombatKnockdown(40)
-	P.on_hit(src, 0, def_zone)
+	P.on_hit(src, 0, def_zone, 0, piercing_hit)
 	return BULLET_ACT_HIT
 
 /mob/living/silicon/flash_act(intensity = 1, override_blindness_check = 0, affect_silicon = 0, visual = 0, type = /atom/movable/screen/fullscreen/tiled/flash/static)

code/modules/mob/living/simple_animal/animal_defense.dm

@@ -124,10 +124,10 @@
 		apply_damage(damage, damagetype, null, getarmor(null, armorcheck))
 		return TRUE
 
-/mob/living/simple_animal/bullet_act(obj/item/projectile/Proj)
+/mob/living/simple_animal/bullet_act(obj/item/projectile/Proj, def_zone, piercing_hit = FALSE)
 	if(!Proj)
 		return
-	apply_damage(Proj.damage, Proj.damage_type)
+	apply_damage(Proj.damage, Proj.damage_type, 0, piercing_hit)
 	Proj.on_hit(src)
 	return BULLET_ACT_HIT
 

code/modules/mob/living/simple_animal/hostile/jungle/mook.dm

@@ -33,12 +33,12 @@
 
 	footstep_type = FOOTSTEP_MOB_BAREFOOT
 
-/mob/living/simple_animal/hostile/jungle/mook/CanPass(atom/movable/O)
+/mob/living/simple_animal/hostile/jungle/mook/CanAllowThrough(atom/movable/O)
+	. = ..()
 	if(istype(O, /mob/living/simple_animal/hostile/jungle/mook))
 		var/mob/living/simple_animal/hostile/jungle/mook/M = O
 		if(M.attack_state == MOOK_ATTACK_ACTIVE && M.throwing)
 			return TRUE
-	return ..()
 
 /mob/living/simple_animal/hostile/jungle/mook/death()
 	desc = "A deceased primitive. Upon closer inspection, it was suffering from severe cellular degeneration and its garments are machine made..."//Can you guess the twist

code/modules/mob/living/simple_animal/hostile/megafauna/bubblegum.dm

@@ -160,10 +160,10 @@ Difficulty: Hard
 	severity = EXPLODE_LIGHT // puny mortals
 	return ..()
 
-/mob/living/simple_animal/hostile/megafauna/bubblegum/CanPass(atom/movable/mover, turf/target)
+/mob/living/simple_animal/hostile/megafauna/bubblegum/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
 	if(istype(mover, /mob/living/simple_animal/hostile/megafauna/bubblegum/hallucination))
-		return 1
-	return ..()
+		return TRUE
 
 /mob/living/simple_animal/hostile/megafauna/bubblegum/Goto(target, delay, minimum_distance)
 	if(!charging)
@@ -466,10 +466,10 @@ Difficulty: Hard
 	new /obj/effect/decal/cleanable/blood(get_turf(src))
 	. = ..()
 
-/mob/living/simple_animal/hostile/megafauna/bubblegum/hallucination/CanPass(atom/movable/mover, turf/target)
+/mob/living/simple_animal/hostile/megafauna/bubblegum/hallucination/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
 	if(istype(mover, /mob/living/simple_animal/hostile/megafauna/bubblegum)) // hallucinations should not be stopping bubblegum or eachother
-		return 1
-	return ..()
+		return TRUE
 
 /mob/living/simple_animal/hostile/megafauna/bubblegum/hallucination/Life()
 	return

code/modules/mob/living/simple_animal/hostile/megafauna/hierophant.dm

@@ -490,7 +490,8 @@ Difficulty: Normal
 	queue_smooth_neighbors(src)
 	return ..()
 
-/obj/effect/temp_visual/hierophant/wall/CanPass(atom/movable/mover, turf/target)
+/obj/effect/temp_visual/hierophant/wall/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
 	if(QDELETED(caster))
 		return FALSE
 	if(mover == caster.pulledby)
@@ -501,7 +502,6 @@ Difficulty: Normal
 			return TRUE
 	if(mover == caster)
 		return TRUE
-	return FALSE
 
 /obj/effect/temp_visual/hierophant/chaser //a hierophant's chaser. follows target around, moving and producing a blast every speed deciseconds.
 	duration = 98

code/modules/mob/living/simple_animal/hostile/megafauna/legion.dm

@@ -394,7 +394,7 @@ SHITCODE AHEAD. BE ADVISED. Also comment extravaganza
 	muzzle_type = /obj/effect/projectile/tracer/legion
 	impact_type = /obj/effect/projectile/tracer/legion
 	hitscan = TRUE
-	movement_type = UNSTOPPABLE
+	projectile_piercing = ALL
 
 ///Used for the legion turret tracer.
 /obj/effect/projectile/tracer/legion/tracer

code/modules/mob/living/simple_animal/hostile/mining_mobs/curse_blob.dm

@@ -72,14 +72,14 @@
 		return
 
 //if it's not our target, we ignore it
-/mob/living/simple_animal/hostile/asteroid/curseblob/CanPass(atom/movable/mover, turf/target)
+/mob/living/simple_animal/hostile/asteroid/curseblob/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
 	if(mover == set_target)
 		return FALSE
 	if(istype(mover, /obj/item/projectile))
 		var/obj/item/projectile/P = mover
 		if(P.firer == set_target)
 			return FALSE
-	return TRUE
 
 #define IGNORE_PROC_IF_NOT_TARGET(X) /mob/living/simple_animal/hostile/asteroid/curseblob/##X(AM) { if (AM == set_target) return ..(); }
 

code/modules/mob/living/simple_animal/hostile/mining_mobs/elites/elite.dm

@@ -383,8 +383,7 @@ While using this makes the system rely on OnFire, it still gives options for tim
 	ourelite = null
 	return ..()
 
-/obj/effect/temp_visual/elite_tumor_wall/CanPass(atom/movable/mover, turf/target)
+/obj/effect/temp_visual/elite_tumor_wall/CanAllowThrough(atom/movable/mover, turf/target)
+	. = ..()
 	if(mover == ourelite || mover == activator)
 		return FALSE
-	else
-		return TRUE

code/modules/mob/living/simple_animal/slime/slime.dm

@@ -231,11 +231,11 @@
 		amount = -abs(amount)
 	return ..() //Heals them
 
-/mob/living/simple_animal/slime/bullet_act(obj/item/projectile/Proj)
+/mob/living/simple_animal/slime/bullet_act(obj/item/projectile/Proj, def_zone, piercing_hit = FALSE)
 	attacked += 10
 	if((Proj.damage_type == BURN))
 		adjustBruteLoss(-abs(Proj.damage)) //fire projectiles heals slimes.
-		Proj.on_hit(src)
+		Proj.on_hit(src, 0, piercing_hit)
 		return BULLET_ACT_BLOCK
 	return ..()
 

code/modules/mob/mob_defines.dm

@@ -9,7 +9,7 @@
 	mouse_drag_pointer = MOUSE_ACTIVE_POINTER
 	throwforce = 10
 	blocks_emissive = EMISSIVE_BLOCK_GENERIC
-
+	pass_flags_self = PASSMOB
 	vis_flags = VIS_INHERIT_PLANE //when this be added to vis_contents of something it inherit something.plane, important for visualisation of mob in openspace.
 
 	attack_hand_is_action = TRUE