[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/projectiles/guns/energy/kinetic_accelerator.dm

@@ -232,14 +232,14 @@
 	kinetic_gun = null
 	return ..()
 
-/obj/item/projectile/kinetic/prehit(atom/target)
+/obj/item/projectile/kinetic/prehit_pierce(atom/target)
 	. = ..()
 	if(.)
 		if(kinetic_gun)
 			var/list/mods = kinetic_gun.get_modkits()
 			for(var/obj/item/borg/upgrade/modkit/M in mods)
 				M.projectile_prehit(src, target, kinetic_gun)
-		if(!lavaland_equipment_pressure_check(get_turf(target)))
+		if(!pressure_decrease_active && !lavaland_equipment_pressure_check(get_turf(target)))
 			name = "weakened [name]"
 			damage = damage * pressure_decrease
 			pressure_decrease_active = TRUE

code/modules/projectiles/guns/misc/beam_rifle.dm

@@ -427,11 +427,9 @@
 	var/aoe_mob_damage = 30
 	var/impact_structure_damage = 0
 	var/impact_direct_damage = 0
-	var/turf/cached
 	var/list/pierced = list()
 
 /obj/item/projectile/beam/beam_rifle/proc/AOE(turf/epicenter)
-	set waitfor = FALSE
 	if(!epicenter)
 		return
 	new /obj/effect/temp_visual/explosion/fast(epicenter)
@@ -447,31 +445,22 @@
 				continue
 			O.take_damage(aoe_structure_damage * get_damage_coeff(O), BURN, "laser", FALSE)
 
-/obj/item/projectile/beam/beam_rifle/proc/check_pierce(atom/target)
-	if(!do_pierce)
-		return FALSE
-	if(pierced[target])		//we already pierced them go away
-		return TRUE
-	if(isclosedturf(target))
-		if(wall_pierce++ < wall_pierce_amount)
-			if(prob(wall_devastate))
-				if(iswallturf(target))
-					var/turf/closed/wall/W = target
-					W.dismantle_wall(TRUE, TRUE)
-				else
-					target.ex_act(EXPLODE_HEAVY)
-			return TRUE
-	if(ismovable(target))
-		var/atom/movable/AM = target
-		if(AM.density && !AM.CanPass(src, get_turf(target)) && !ismob(AM))
-			if(structure_pierce < structure_pierce_amount)
-				if(isobj(AM))
-					var/obj/O = AM
-					O.take_damage((impact_structure_damage + aoe_structure_damage) * structure_bleed_coeff * get_damage_coeff(AM), BURN, "energy", FALSE)
-				pierced[AM] = TRUE
-				structure_pierce++
-				return TRUE
-	return FALSE
+/obj/item/projectile/beam/beam_rifle/proc/check_pierce(atom/A)
+	if(isclosedturf(A) && (wall_pierce < wall_pierce_amount))
+		if(prob(wall_devastate))
+			if(iswallturf(A))
+				var/turf/closed/wall/W = A
+				W.dismantle_wall(TRUE, TRUE)
+			else
+				target.ex_act(EXPLODE_HEAVY)
+		++wall_pierce
+		return PROJECTILE_PIERCE_PHASE			// yeah this gun is a snowflakey piece of garbage - Silly-Cons
+	if(isobj(A) && (structure_pierce < structure_pierce_amount))
+		++structure_pierce
+		var/obj/O = A
+		O.take_damage((impact_structure_damage + aoe_structure_damage) * structure_bleed_coeff * get_damage_coeff(A), BURN, ENERGY, FALSE)
+		return PROJECTILE_PIERCE_PHASE			// ditto and this could be refactored to on_hit honestly - Silly-Cons
+ 	return ..()
 
 /obj/item/projectile/beam/beam_rifle/proc/get_damage_coeff(atom/target)
 	if(istype(target, /obj/machinery/door))
@@ -491,32 +480,18 @@
 		L.adjustFireLoss(impact_direct_damage)
 		L.emote("scream")
 
-/obj/item/projectile/beam/beam_rifle/proc/handle_hit(atom/target)
+/obj/item/projectile/beam/beam_rifle/proc/handle_hit(atom/target, piercing_hit = FALSE)
 	set waitfor = FALSE
-	if(!cached && !QDELETED(target))
-		cached = get_turf(target)
 	if(nodamage)
 		return FALSE
-	playsound(cached, 'sound/effects/explosion3.ogg', 100, 1)
-	AOE(cached)
+	playsound(src, 'sound/effects/explosion3.ogg', 100, TRUE)
+	if(!piercing_hit)
+		AOE(get_turf(target) || get_turf(src))
 	if(!QDELETED(target))
 		handle_impact(target)
 
-/obj/item/projectile/beam/beam_rifle/Bump(atom/target)
-	if(check_pierce(target))
-		permutated += target
-		trajectory_ignore_forcemove = TRUE
-		forceMove(target.loc)
-		trajectory_ignore_forcemove = FALSE
-		return FALSE
-	if(!QDELETED(target))
-		cached = get_turf(target)
-	. = ..()
-
-/obj/item/projectile/beam/beam_rifle/on_hit(atom/target, blocked = FALSE)
-	if(!QDELETED(target))
-		cached = get_turf(target)
-	handle_hit(target)
+/obj/projectile/beam/beam_rifle/on_hit(atom/target, blocked = FALSE, piercing_hit = FALSE)
+	handle_hit(target, piercing_hit)
 	. = ..()
 
 /obj/item/projectile/beam/beam_rifle/hitscan
@@ -547,6 +522,9 @@
 	hitscan_light_intensity = 0
 	hitscan_light_color_override = "#99ff99"
 
-/obj/item/projectile/beam/beam_rifle/hitscan/aiming_beam/prehit(atom/target)
+/obj/projectile/beam/beam_rifle/hitscan/aiming_beam/prehit_pierce(atom/target)
+	return PROJECTILE_DELETE_WITHOUT_HITTING
+
+/obj/projectile/beam/beam_rifle/hitscan/aiming_beam/on_hit()
 	qdel(src)
-	return FALSE
+	return BULLET_ACT_BLOCK

code/modules/projectiles/guns/misc/blastcannon.dm

@@ -114,7 +114,8 @@
 	icon_state = "blastwave"
 	damage = 0
 	nodamage = FALSE
-	movement_type = FLYING | UNSTOPPABLE
+	movement_type = FLYING
+	projectile_phasing = ALL		// just blows up the turfs lmao - Silly-Cons
 	var/heavyr = 0
 	var/mediumr = 0
 	var/lightr = 0