Primordial cavern layer (#12)

* bring in the art assets from ClockGen's "better_caves_modpack" under CC BY 4.0,, code written from scratch.

* update mapgen_helper

* import ClockGen's giant mushroom schematics, make them and giant ferns growable

* add giant jungle mushroom, rough out actual cavern layer code framework

* fungal ceiling decorations

* decorate fungal floor a bit

* update mapgen_helper

* update primordial mushroom schematic placement to ensure it fits

* add giant mycelium fungoidal structure

* add giant mycelium to mapgen

* fix settings for giant mycelium

* make mycelium grow when players aren't present

* allow mycelium growth to pause when it hits unloaded areas

* add a use for giant mycelium

* make giant mushrooms edible, make jungle trees growable

* rough out the jungle biome

* Make a spectrum of jungle growth

* optimize pngs, add is_ground_content to everything

* use custom is_ground_content method

* fix a crash with veinstone, and simplify nvals_cave lookup now that overgen covers the same area

* more fixes for overgen support

* remove unintentional airspace from underside of slade

* fix for overgen crash in level 2

* primordial column material, add sealed shafts to underworld

* add seal block

* Set up puzzle seals to be able to dig a staircase shaft through the slade layer. TODO: the puzzle to guard the trigger.

* puzzle seals now fully functional. Need to add clues for decoding the keys next.

* add a small bit of anti-griefing - the seal breach bell only tolls globally 13 times per activation

* add flowers to the underworld warrior bones

* switch to a different key bell

* fancy up the puzzle seal temples with some custom blocks, add sub-slade grid passages

* add a clue to the seal formspec

* tweak background of inscription 2 so it's less obviously a copy of the background for inscription 1

* switch to compositing to save a few bytes

* fancy up the seal's upper surface with inscriptions to make the formspec feel consistent

* puzzle particle, bones were only spawning on top of structures

* fix ice/oil on level 3, tweak some loot probabilities

* add trail mod support

* remove deprecated files

* boost default plant growth delay, add growing selection boxes

* update map colours

* add named waypoints to the underworld

* try a more efficient way of changing the interiors of columns

* polishing up the Primordial layer

* update guide with some Primordial teasers

* updated magma sea screenshot

* update mapgen_helper and subterrane

* reduce density of megaflora a bit - was too hard to walk through

* spreading_dirt_type depends on light, create my own ABM instead

* add names to the glowing pits and some of the ruins

* separate setting for ruin markers

* record identity of slade-breachers

* make mycelia climbable

* update subterrane

* change surface tunnel detection to allow above-ground stalactites and stalagmites

* add rare thicker Goblin Caps, suitable for use as huts.

* better goblin cap schematics

* update colours

* make it slightly harder to dig down through amethyst sheathing of pits

* fixing up fungus light sensitivity, tree growth code

* fix a few minor bugs

* update deprecated functions

* add various eating sounds

* make mapping kit requirement more flexible

* update spindlestem growth code, remove deprecated functions

* fix leftover undefined variable

* add fireflies to primordial, spread out the post-mapgen node timer for plant matter a bit more.

* fix bones formspec

* add lbm to upgrade old bones

* fix slade undiggability

* make torchspines smokey and manually lightable

* fix drop definitions

* generate dry stalactites in near-surface caverns.

* caverns become far too smokey, alas

* add pitter patter of spore tree spores, alternate paper recipe

* new mapgen_helper metrics

* add smokey back to torchspine now that it can be dialed down a bit

* replace glowstone texture with a new animated one

* switch from ABM to node timer for mapgen mycelium growth

* make mapgen mycelium timer delay configurable

* improve the efficiency of giant mycelium growth using flat node array, fewer dereferences

* remove the smoke from torchspines again - it doesn't dissipate that deep underground

* give slade a more muted, gloomy hue to differentiate it from nether stone

* update screenshots with new slade colors

* update mapgen_helper

df_trees/spore_tree.lua

@@ -157,6 +157,7 @@ minetest.register_node("df_trees:spore_tree_sapling", {
 	paramtype = "light",
 	sunlight_propagates = true,
 	walkable = false,
+	is_ground_content = false,
 	floodable = true,
 	selection_box = {
 		type = "fixed",
@@ -167,15 +168,21 @@ minetest.register_node("df_trees:spore_tree_sapling", {
 	sounds = default.node_sound_leaves_defaults(),
 
 	on_construct = function(pos)
-		local below_node = minetest.get_node(vector.add(pos, {x=0,y=-1,z=0}))
-		if minetest.get_item_group(below_node.name, "soil") > 0 then
-			minetest.get_node_timer(pos):start(math.random(
-				df_trees.config.spore_tree_delay_multiplier*df_trees.config.tree_min_growth_delay,
-				df_trees.config.spore_tree_delay_multiplier*df_trees.config.tree_max_growth_delay))
+		if minetest.get_item_group(minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z}).name, "soil") == 0 then
+			return
 		end
+		minetest.get_node_timer(pos):start(math.random(
+			df_trees.config.spore_tree_delay_multiplier*df_trees.config.tree_min_growth_delay,
+			df_trees.config.spore_tree_delay_multiplier*df_trees.config.tree_max_growth_delay))
+	end,
+	on_destruct = function(pos)
+		minetest.get_node_timer(pos):stop()
 	end,
 	
 	on_timer = function(pos)
+		if df_farming and df_farming.kill_if_sunlit(pos) then
+			return
+		end
 		minetest.set_node(pos, {name="air"})
 		df_trees.spawn_spore_tree(pos)
 	end,
@@ -187,7 +194,7 @@ local c_spore_pod = minetest.get_content_id("df_trees:spore_tree_fruiting_body")
 local c_tree = minetest.get_content_id("df_trees:spore_tree")
 local c_spore_frond = minetest.get_content_id("df_trees:spore_tree_hyphae")
 
-df_trees.spawn_spore_tree_vm = function(vi, area, data, height, size, iters, has_fruiting_bodies)
+df_trees.spawn_spore_tree_vm = function(vi, area, data, data_param2, height, size, iters, has_fruiting_bodies)
 	if height == nil then height = math.random(3,6) end
 	if size == nil then size = 2 end
 	if iters == nil then iters = 10 end
@@ -204,6 +211,7 @@ df_trees.spawn_spore_tree_vm = function(vi, area, data, height, size, iters, has
 		local node_id = data[vi]
 		if node_id == c_air or node_id == c_ignore or node_id == c_spore_frond or node_id == c_spore_pod then
 			data[vi] = c_tree
+			data_param2[vi] = 0
 		end
 	end
 
@@ -218,6 +226,7 @@ df_trees.spawn_spore_tree_vm = function(vi, area, data, height, size, iters, has
 				else
 					data[vi] = c_spore_frond
 				end
+				data_param2[vi] = 0
 			end
 			vi = vi + 1
 		end
@@ -240,6 +249,7 @@ df_trees.spawn_spore_tree_vm = function(vi, area, data, height, size, iters, has
 						else
 							data[vi] = c_spore_frond
 						end
+						data_param2[vi] = 0
 					end
 				end
 			end
@@ -258,10 +268,12 @@ df_trees.spawn_spore_tree = function(pos)
 	)
 	local area = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 	local data = vm:get_data()
+	local data_param_2 = vm:get_param2_data()
 
-	df_trees.spawn_spore_tree_vm(area:indexp(pos), area, data)
+	df_trees.spawn_spore_tree_vm(area:indexp(pos), area, data, data_param_2)
 
 	vm:set_data(data)
+	vm:set_param2_data(data_param_2)
 	vm:write_to_map()
 	vm:update_map()
 end
@@ -284,7 +296,12 @@ minetest.register_abm{
 			vertical = false,
 			texture = "dfcaverns_spore_tree_spores.png",
 		})
-		
+		if math.random() < 0.025 then
+			minetest.sound_play("dfcaverns_spore_tree_pitter_patter", {
+				pos = pos,
+				gain = 0.2,
+			})
+		end
 	end,
 }
 
@@ -324,4 +341,3 @@ minetest.register_node("df_trees:spore_tree_ladder", {
 	legacy_wallmounted = true,
 	sounds = default.node_sound_wood_defaults(),
 })
-