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Cody Brittain 310ed9b4c0 Reworked how napalm works. (#21843)
Reworked how napalm works to make it more powerful with the new turf
fires. Instead of directly creating a turf fire, it'll instead process a
slower burning, but deadly turf fire.

Also added a military-grade flamethrower, which can use the new napalm.
This will create napalm pools on the ground and ignite them, instead of
directly creating turf fires.

### Asset Licenses
The following assets that **have not** been created by myself are
included in this PR:

| Path | Original Author | License |
| --- | --- | --- |
| icons/obj/item/military_flamethrower.dmi | electricpants#6824
([Shiptest](https://github.com/shiptest-ss13/Shiptest)) | CC-BY-SA 3.0 |
2026-02-18 16:56:24 +00:00

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/obj/effect/decal/cleanable/liquid_fuel
//Liquid fuel is used for things that used to rely on volatile fuels or phoron being contained to a couple tiles.
name = "liquid fuel"
desc = "Some kind of sticky, flammable liquid."
icon = 'icons/effects/effects.dmi'
icon_state = "fuel"
layer = BLOOD_LAYER
anchored = 1
var/amount = 1
/obj/effect/decal/cleanable/liquid_fuel/Initialize(mapload, amt = 1, nologs = 0)
. = ..()
if(!nologs && !mapload)
log_and_message_admins("spilled liquid fuel", user = usr, location = get_turf(src))
src.amount = amt
var/has_spread = 0
//Be absorbed by any other liquid fuel in the tile.
for(var/obj/effect/decal/cleanable/liquid_fuel/other in loc)
if(other != src)
other.amount += src.amount
other.Spread()
has_spread = 1
break
if(!has_spread)
Spread()
else
qdel(src)
/obj/effect/decal/cleanable/liquid_fuel/proc/Spread(exclude=list())
//Allows liquid fuels to sometimes flow into other tiles.
if(amount < 15) return //lets suppose welder fuel is fairly thick and sticky. For something like water, 5 or less would be more appropriate.
var/turf/simulated/S = loc
if(!istype(S)) return
for(var/d in GLOB.cardinals)
var/turf/simulated/target = get_step(src,d)
var/turf/simulated/origin = get_turf(src)
if(origin.CanPass(null, target, 0, 0) && target.CanPass(null, origin, 0, 0))
var/obj/effect/decal/cleanable/liquid_fuel/other_fuel = locate() in target
if(other_fuel)
other_fuel.amount += amount*0.25
if(!(other_fuel in exclude))
exclude += src
other_fuel.Spread(exclude)
else
new/obj/effect/decal/cleanable/liquid_fuel(target, amount*0.25,1)
amount *= 0.75
/obj/effect/decal/cleanable/foam //Copied from liquid fuel
name = "foam"
desc = "Some kind of extinguishing foam."
gender = PLURAL
density = 0
anchored = 1
icon = 'icons/effects/effects.dmi'
icon_state = "white_foam"
var/amount = 1
/obj/effect/decal/cleanable/foam/Initialize(mapload, amt = 1, nologs = 0)
SHOULD_CALL_PARENT(FALSE)
if(flags_1 & INITIALIZED_1)
stack_trace("Warning: [src]([type]) initialized multiple times!")
flags_1 |= INITIALIZED_1
src.amount = amt
var/has_spread = 0
//Be absorbed by any other liquid fuel in the tile.
for(var/obj/effect/decal/cleanable/foam/other in loc)
if(other != src)
other.amount += src.amount
other.Spread()
has_spread = 1
break
if(!has_spread)
Spread()
QDEL_IN(src, 2 MINUTES)
return INITIALIZE_HINT_NORMAL
else
return INITIALIZE_HINT_QDEL
/obj/effect/decal/cleanable/foam/proc/Spread(exclude=list())
if(amount < 15) return
var/turf/simulated/S = loc
if(!istype(S)) return
for(var/d in GLOB.cardinals)
var/turf/simulated/target = get_step(src,d)
var/turf/simulated/origin = get_turf(src)
if(origin.CanPass(null, target, 0, 0) && target.CanPass(null, origin, 0, 0))
var/obj/effect/decal/cleanable/foam/other_foam = locate() in target
if(other_foam)
other_foam.amount += amount*0.25
if(!(other_foam in exclude))
exclude += src
other_foam.Spread(exclude)
else
new/obj/effect/decal/cleanable/foam(target, amount*0.25,1)
amount *= 0.75