Reduces damage to pilots from shots penetrating the cockpit (#23033)

I mistakenly assumed mech armour was good.

Only combat armour reduces the damage of any rifle round, all other mech
armour is worthless against actual weapons.

code/modules/heavy_vehicle/components/body.dm

@@ -30,6 +30,13 @@
 	var/pilot_coverage = 100
 	var/transparent_cabin = FALSE
 	var/hide_pilot = TRUE
+	///Percentage chance for a projectile to hit the pilot if the hatch is open or penetrated. 100% means the pilot will always be hit, 0% means the pilot will never be hit. Side hits divide this value by 4.
+	var/cockpit_hatch_size = 80
+	///Multiplier for damage dealt to the pilot when hit by projectiles that penetrate the mech's cockpit.
+	var/cockpit_pilot_damage_multiplier = 0.5
+	///Multiplier for armour piercing value of a hit to the pilot when hit by projectiles that penetrate the mech's cockpit.
+	var/cockpit_pilot_armour_piercing_multiplier = 0.5
+
 	has_hardpoints = list(HARDPOINT_BACK, HARDPOINT_LEFT_SHOULDER, HARDPOINT_RIGHT_SHOULDER)
 
 	/**
@@ -70,6 +77,12 @@
 	QDEL_NULL(air_supply)
 	. = ..()
 
+/obj/item/mech_component/chassis/mechanics_hints(mob/user, distance, is_adjacent)
+	. = ..()
+	. += SPAN_NOTICE("This chasis covers <b>[pilot_coverage]%</b> of the pilot's body.")
+	. += SPAN_NOTICE("When open or destroyed the cockpit hatch will allow <b>[cockpit_hatch_size]%</b> of incoming attacks to hit the pilot.")
+	. += SPAN_NOTICE("When closed but destroyed the cockpit hatch will reduce damage to the pilot by <b>[round((1 - cockpit_pilot_damage_multiplier) * 100, 0.1)]%</b>.")
+
 /obj/item/mech_component/chassis/get_missing_parts_text()
 	. = ..()
 

code/modules/heavy_vehicle/mech_damage.dm

@@ -17,10 +17,10 @@
 	if(!hatch_closed) //Open hatches only expose the pilot to attacks from the front and a little bit from the sides.
 		if(incoming_attack_direction)
 			if (dir & incoming_attack_direction)
-				if(prob(80)) //80% chance to hit the pilot from the front if the hatch is open. If this is 100% turrets will shoot mechs with open hatches forever.
+				if(prob(body.cockpit_hatch_size)) //80% chance to hit the pilot from the front if the hatch is open. If this is 100% turrets will shoot mechs with open hatches forever.
 					return TRUE
 			if ((turn(dir, 90) & incoming_attack_direction) || (turn(dir, -90) & incoming_attack_direction))
-				if(prob(20)) //20% chance to hit the pilot from the sides if the hatch is open.
+				if(prob(body.cockpit_hatch_size / 4)) //20% chance to hit the pilot from the sides if the hatch is open.
 					return TRUE
 
 	return FALSE
@@ -120,8 +120,9 @@
 	if(target == body && body.damage_state == MECH_COMPONENT_DAMAGE_DAMAGED_TOTAL) //If the cockpit is destroyed, subsequent damage is applied to the pilot, modified by the mech's armour.
 		if(body && LAZYLEN(pilots))
 			var/mob/living/pilot = pick(pilots)
-			visible_message(SPAN_DANGER("\The [used_weapon] pierces the mangled cockpit of \the [src], striking the pilot inside!"))
-			pilot.apply_damage(damage, damagetype, def_zone, used_weapon, damage_flags, armor_pen, silent = FALSE)
+			if(prob(body.cockpit_hatch_size))
+				visible_message(SPAN_DANGER("\The [used_weapon] pierces the mangled cockpit of \the [src], striking the pilot inside!"))
+				pilot.apply_damage(damage * body.cockpit_pilot_damage_multiplier, damagetype, def_zone, used_weapon, damage_flags, armor_pen * body.cockpit_pilot_armour_piercing_multiplier, silent = FALSE)
 
 	//Only 2 types of damage concern mechs and vehicles
 	switch(damagetype)

code/modules/heavy_vehicle/premade/combat.dm

@@ -57,6 +57,8 @@
 	name = "sealed exosuit chassis"
 	hatch_descriptor = "canopy"
 	pilot_coverage = 100
+	cockpit_hatch_size = 60
+	cockpit_pilot_damage_multiplier = 0.4
 	exosuit_desc_string = "an armored chassis"
 	desc = "A lightweight composite frame keeps the armor of this chassis respectable, but the interior spacious."
 	icon_state = "combat_body"

code/modules/heavy_vehicle/premade/cult.dm

@@ -61,6 +61,8 @@
 	desc = "Despite its looks, this protective chassis provides supreme comfort to its pilot during their conquest."
 	hatch_descriptor = "bloodied ribcage"
 	pilot_coverage = 100
+	cockpit_hatch_size = 60
+	cockpit_pilot_damage_multiplier = 0.4
 	exosuit_desc_string = "a bloodied chassis"
 	icon_state = "cult_body"
 	max_damage = 150

code/modules/heavy_vehicle/premade/heavy.dm

@@ -53,6 +53,8 @@
 	hatch_descriptor = "hatch"
 	desc = "The HI-Koloss chassis is a veritable juggernaut, capable of protecting a pilot even in the most hostile of environments. It handles like a battlecruiser, however."
 	pilot_coverage = 100
+	cockpit_hatch_size = 70
+	cockpit_pilot_damage_multiplier = 0.3
 	exosuit_desc_string = "a heavily armored chassis"
 	icon_state = "heavy_body"
 	max_damage = 300

code/modules/heavy_vehicle/premade/light.dm

@@ -53,6 +53,8 @@
 /obj/item/mech_component/chassis/light
 	name = "light exosuit chassis"
 	pilot_coverage = 100
+	cockpit_hatch_size = 50
+	cockpit_pilot_damage_multiplier = 0.8
 	transparent_cabin = TRUE
 	hatch_descriptor = "canopy"
 	exosuit_desc_string = "an open and light chassis"

code/modules/heavy_vehicle/premade/military.dm

@@ -40,6 +40,8 @@
 	hatch_descriptor = "hatch"
 	desc = "A cramped compartment and a senseless amount of armor is all this steel coffin contains."
 	pilot_coverage = 100
+	cockpit_hatch_size = 60
+	cockpit_pilot_damage_multiplier = 0.2
 	exosuit_desc_string = "a heavily armored chassis"
 	icon_state = "strider_body"
 	max_damage = 750

code/modules/heavy_vehicle/premade/powerloader.dm

@@ -75,6 +75,8 @@
 	name = "open exosuit chassis"
 	hatch_descriptor = "roll cage"
 	pilot_coverage = 40
+	cockpit_hatch_size = 90
+	cockpit_pilot_damage_multiplier = 0.6 ///The hatch is thick, but the pilot coverage is poor.
 	exosuit_desc_string = "an industrial rollcage"
 	desc = "A Xion industrial brand roll cage. Technically OSHA compliant. Technically. This variant has an extra compartment for a copilot, but has no sealed atmosphere."
 	max_damage = 200

code/modules/heavy_vehicle/premade/pra.dm

@@ -54,6 +54,8 @@
 	name = "\improper P'kus-3 chassis"
 	hatch_descriptor = "canopy"
 	pilot_coverage = 100
+	cockpit_hatch_size = 70
+	cockpit_pilot_damage_multiplier = 0.8
 	exosuit_desc_string = "a light armored chassis"
 	desc = "A lightweight composite frame keeps the armor of this chassis respectable, but the interior spacious."
 	icon_state = "egg_body"
@@ -97,6 +99,8 @@
 	icon_state = "strong_egg_body"
 	max_damage = 150
 	power_use = 250
+	cockpit_hatch_size = 40
+	cockpit_pilot_damage_multiplier = 0.5
 
 	cell_type = /obj/item/cell/mecha/nuclear