Ports tg's cavegen, bitfields, area_flags, improved random mineral ro…

…cks (#4800)

* Refactor bitfields global, improve turret_flags debugging (#53239)

* Refactors area stuff (#52751)

-bitfielded a bunch of bools on /area, I left some untouched cus they get called a lot
-Unused vars
-Fixed a var pretending to be a fake bool
-Probably more

* Random mineral spawns change less turfs. (#49205)

As-is, random mineral spawning changes the turf to the subtype with that mineral, which results in a lot of turf changes I guess. Now it just changes the mineralType of the turf. Unless it's gibtonite or a cave spawner, because the alternatives are worse and those aren't all that common anyway.

🆑
tweak: Random mineral turfs no longer cause large amounts of turf changes on initialization.
/🆑

* Refactor the procedural generation of lavaland and turf/closed/mineral (#54915)

This replaces lavaland's old diagonal tunnel gen which was really
horrendously jammed into asteroid floor code (?????) with Cellular
Automata which runs in rust (PR for that here:
tgstation/rust-g#57 ). The new code is a bit
cleaner, but also looks better.

VID: https://streamable.com/a45ke2

Things to do:
- Make an icemoon version
- Fix the roundstart atmos adjacency issues

I asked AnturK if this was an acceptable PR for this month; he said it
was okay as long as I didn't add new areas, which I don't plan to do.
But if anyone thinks this PR breaks the spirit of the month I'll open
it again in december.

* fix (#55462)

* Fix lavaland map

* Fix bad merge

Co-authored-by: Urumasi <[email protected]>

Co-authored-by: Jared-Fogle <[email protected]>
Co-authored-by: TiviPlus <[email protected]>
Co-authored-by: Buggy123 <[email protected]>
Co-authored-by: Qustinnus <[email protected]>
Co-authored-by: Urumasi <[email protected]>

beestation.dme

@@ -30,6 +30,7 @@
 #include "code\__DEFINES\atmospherics.dm"
 #include "code\__DEFINES\atom_hud.dm"
 #include "code\__DEFINES\balloon_alert.dm"
+#include "code\__DEFINES\bitfields.dm"
 #include "code\__DEFINES\callbacks.dm"
 #include "code\__DEFINES\cargo.dm"
 #include "code\__DEFINES\chat.dm"
@@ -573,6 +574,8 @@
 #include "code\datums\mapgen\_MapGenerator.dm"
 #include "code\datums\mapgen\JungleGenerator.dm"
 #include "code\datums\mapgen\biomes\_biome.dm"
+#include "code\datums\mapgen\CaveGenerator.dm"
+#include "code\datums\mapgen\Cavegens\LavalandGenerator.dm"
 #include "code\datums\martial\_martial.dm"
 #include "code\datums\martial\boxing.dm"
 #include "code\datums\martial\cqc.dm"

code/__DEFINES/bitfields.dm

@@ -0,0 +1,4 @@
+#define DEFINE_BITFIELD(_variable, _flags) /datum/bitfield/##_variable { \
+	flags = ##_flags; \
+	variable = #_variable; \
+}

code/__DEFINES/flags.dm

@@ -45,6 +45,28 @@ GLOBAL_LIST_INIT(bitflags, list(1, 2, 4, 8, 16, 32, 64, 128, 256, 512, 1024, 204
 #define NO_LAVA_GEN_1				(1<<6) 	//! Blocks lava rivers being generated on the turf
 #define NO_RUINS_1					(1<<10) //! Blocks ruins spawning on the turf
 
+////////////////Area flags\\\\\\\\\\\\\\
+/// If it's a valid territory for cult summoning or the CRAB-17 phone to spawn
+#define VALID_TERRITORY				(1<<0)
+/// If blobs can spawn there and if it counts towards their score.
+#define BLOBS_ALLOWED				(1<<1)
+/// If mining tunnel generation is allowed in this area
+#define CAVES_ALLOWED				(1<<2)
+/// If flora are allowed to spawn in this area randomly through tunnel generation
+#define FLORA_ALLOWED				(1<<3)
+/// If mobs can be spawned by natural random generation
+#define MOB_SPAWN_ALLOWED			(1<<4)
+/// If megafauna can be spawned by natural random generation
+#define MEGAFAUNA_SPAWN_ALLOWED		(1<<5)
+/// Hides area from player Teleport function.
+#define HIDDEN_AREA					(1<<6)
+/// If false, loading multiple maps with this area type will create multiple instances.
+#define UNIQUE_AREA					(1<<7)
+/// If people are allowed to suicide in it. Mostly for OOC stuff like minigames
+#define BLOCK_SUICIDE				(1<<8)
+/// Can the Xenobio management console transverse this area by default?
+#define XENOBIOLOGY_COMPATIBLE		(1<<9)
+
 /*
 	These defines are used specifically with the atom/pass_flags bitmask
 	the atom/checkpass() proc uses them (tables will call movable atom checkpass(PASSTABLE) for example)

code/__DEFINES/mobs.dm

@@ -394,3 +394,6 @@
 
 //Saves a proc call, life is suffering. If who has no targets_from var, we assume it's just who
 #define GET_TARGETS_FROM(who) (who.targets_from ? who.get_targets_from() : who)
+
+///Define for spawning megafauna instead of a mob for cave gen
+#define SPAWN_MEGAFAUNA "bluh bluh huge boss"

code/__HELPERS/areas.dm

@@ -67,7 +67,7 @@ GLOBAL_LIST_INIT(typecache_powerfailure_safe_areas, typecacheof(/area/engine/eng
 		var/area/place = get_area(turfs[i])
 		if(blacklisted_areas[place.type])
 			continue
-		if(!place.requires_power || place.teleport_restriction || place.hidden)
+		if(!place.requires_power || place.teleport_restriction || place.area_flags & HIDDEN_AREA)
 			continue // No expanding powerless rooms etc
 		areas[place.name] = place
 	var/area_choice = input(creator, "Choose an area to expand or make a new area.", "Area Expansion") as null|anything in areas

code/__HELPERS/unsorted.dm

@@ -1129,7 +1129,8 @@ eg2: `center_image(I, 96,96)`
 		while (L.len && !target)
 			var/I = rand(1, L.len)
 			var/turf/T = L[I]
-			if(!T.density)
+			var/area/X = get_area(T)
+			if(!T.density && (X.area_flags & VALID_TERRITORY))
 				var/clear = TRUE
 				for(var/obj/O in T)
 					if(O.density)