Reintroduce adobe dungeons

Instead of just Winter's original adobe dungeons
which were an alternative to the at-the-time
boring and empty NC cobble-only dungeons,
create complex mixed adobe/brick dungeons
at shallower depths, leave stone dungeons for
deeper depths.

These now have bricks and bonded bricks,
loot, and there is a blended transition between
adobe/stone dungeon areas (we can't make a
single dungeon generate entirely of one or the
other material it seems).

TODO

@@ -1,12 +1,8 @@
 ------------------------------------------------------------------------
 
-- More code cleanup, reorganize by feature
-
 - Use radiation to poison and kill moss en masse
 
-- Fix dungeon registration so loot works too
-
-- Review and unify generic spreading ABMs
+- Reintroduce moss in dungeons?
 
 - Shakedown mechanics
 	- Make sure each item has a method to...

feature_biomes.lua

@@ -3,8 +3,6 @@ local minetest
     = minetest
 -- LUALOCALS > ---------------------------------------------------------
 
-local modname = minetest.get_current_modname()
-
 minetest.register_biome({
 		name = "grassland",
 		node_top = "nc_terrain:dirt_with_grass",
@@ -13,8 +11,6 @@ minetest.register_biome({
 		depth_filler = 2,
 		node_riverbed = "nc_terrain:sand",
 		depth_riverbed = 1,
-		node_dungeon = "nc_concrete:adobe",
-		node_dungeon_alt = modname .. ":mossy_dirt",
 		y_min = 1,
 		y_max = 31000,
 		vertical_blend = 16,
@@ -31,8 +27,6 @@ minetest.register_biome({
 		depth_filler = 2,
 		node_riverbed = "nc_terrain:sand",
 		depth_riverbed = 4,
-		node_dungeon = "nc_stonework:bricks",
-		node_dungeon_alt = modname .. ":mossy_bricks",
 		y_min = 0,
 		y_max = 2,
 		vertical_blend = 2,
@@ -49,8 +43,6 @@ minetest.register_biome({
 		depth_filler = 2,
 		node_riverbed = "nc_terrain:sand",
 		depth_riverbed = 2,
-		node_dungeon = "nc_concrete:adobe",
-		node_dungeon_alt = modname .. ":mossy_dirt",
 		y_min = 2,
 		y_max = 48,
 		vertical_blend = 4,
@@ -67,8 +59,6 @@ minetest.register_biome({
 		depth_filler = 4,
 		node_riverbed = "nc_terrain:sand",
 		depth_riverbed = 2,
-		node_dungeon = "nc_stonework:bricks_bonded",
-		node_dungeon_alt = modname .. ":mossy_bricks_bonded",
 		y_min = 2,
 		y_max = 250,
 		vertical_blend = 16,
@@ -85,8 +75,6 @@ minetest.register_biome({
 		depth_filler = 8,
 		node_riverbed = "nc_terrain:gravel",
 		depth_riverbed = 2,
-		node_dungeon = "nc_stonework:bricks_bonded",
-		node_dungeon_alt = modname .. ":mossy_bricks_bonded",
 		y_min = 4,
 		y_max = 200,
 		vertical_blend = 16,
@@ -103,8 +91,6 @@ minetest.register_biome({
 		depth_filler = 12,
 		node_riverbed = "nc_terrain:gravel",
 		depth_riverbed = 2,
-		node_dungeon = "nc_stonework:bricks_bonded",
-		node_dungeon_alt = modname .. ":mossy_bricks_bonded",
 		y_min = 6,
 		y_max = 150,
 		vertical_blend = 16,

feature_dungeon.lua

@@ -0,0 +1,26 @@
+-- LUALOCALS < ---------------------------------------------------------
+local minetest, nodecore
+    = minetest, nodecore
+-- LUALOCALS > ---------------------------------------------------------
+
+local mapperlin
+minetest.after(0, function() mapperlin = minetest.get_perlin(8658, 1, 0, 1) end)
+
+nodecore.register_dungeongen({
+		label = "nature dungeons",
+		func = function(pos)
+			if pos.y < -10 then return end
+			local rng = nodecore.seeded_rng(mapperlin:get_3d(pos))
+			if pos.y < 0 and rng(-10, 0) > pos.y then return end
+			if rng(1, 4) ~= 1 then
+				return minetest.set_node(pos, {name = "nc_concrete:adobe"})
+			end
+			local below = {x = pos.x, y = pos.y - 1, z = pos.z}
+			local bnode = minetest.get_node(below)
+			local bdef = minetest.registered_nodes[bnode.name] or {}
+			return minetest.set_node(pos, {name = "nc_stonework"
+					.. (rng(1, 10) <= (bdef.walkable and 9 or 2)
+						and ":bricks_adobe"
+						or ":bricks_adobe_bonded")})
+		end
+	})

init.lua

@@ -3,8 +3,9 @@ local include
     = include
 -- LUALOCALS > ---------------------------------------------------------
 
-include("biomes")
-include("cultivate")
+include("feature_biomes")
+include("feature_dungeon")
+include("feature_spread")
 
 include("item_fiber")
 include("item_thatch")