adding biome API. Not yet tested.

df_caverns/level1.lua

@@ -41,6 +41,13 @@ local get_biome = function(heat, humidity)
 	end
 end
 
+table.insert(df_caverns.get_biome_at_pos_list, function(pos, heat, humidity)
+	if pos.y < df_caverns.config.level1_min or pos.y > df_caverns.config.ymax then
+		return nil
+	end
+	return get_biome(heat, humidity)	
+end)
+
 local tower_cap_cavern_floor = function(abs_cracks, vert_rand, vi, area, data, data_param2)
 	local ystride = area.ystride
 	if abs_cracks < 0.1 then

df_caverns/level2.lua

@@ -43,6 +43,13 @@ local get_biome = function(heat, humidity)
 	end
 end
 
+table.insert(df_caverns.get_biome_at_pos_list, function(pos, heat, humidity)
+	if pos.y < df_caverns.config.level2_min or pos.y >= df_caverns.config.level1_min then
+		return nil
+	end
+	return get_biome(heat, humidity)	
+end)
+
 local goblin_cap_shrublist
 local tunnel_tube_shrublist
 local spore_tree_shrublist

df_caverns/level3.lua

@@ -36,6 +36,20 @@ local get_biome = function(heat, humidity)
 	end
 end
 
+table.insert(df_caverns.get_biome_at_pos_list, function(pos, heat, humidity)
+	if pos.y < df_caverns.config.level3_min or pos.y >= df_caverns.config.level2_min then
+		return nil
+	end
+	local biome = get_biome(heat, humidity)
+	if biome == "bloodnether" then
+		if subterrane.get_cavern_value("cavern layer 3", pos) < 0 then
+			return "nethercap"
+		end
+		return "bloodthorn"
+	end
+	return biome
+end)
+
 local black_cap_shrublist
 local nether_cap_shrublist
 local blood_thorn_shrublist

df_caverns/primordial.lua

@@ -24,6 +24,16 @@ local perlin_wave_primordial = {
 
 local giant_mycelium_timer_spread = tonumber(minetest.settings:get("dcaverns_giant_mycelium_timer_spread")) or 10
 
+table.insert(df_caverns.get_biome_at_pos_list, function(pos, heat, humidity)
+	if pos.y < df_caverns.config.primordial_min or pos.y > df_caverns.config.primordial_max then
+		return nil
+	end
+	if subterrane.get_cavern_value("primordial", pos) < 0 then
+		return "primordial jungle"
+	end
+	return "primordial fungus"
+end)
+
 -----------------------------------------------------------------------------------------
 -- Fungal biome
 
@@ -411,7 +421,7 @@ minetest.register_ore({
 	random_factor = 0,
 })
 
--- Rather than make plants farmable, have them randomly respawn in jungle soil. You can only get them down there.
+-- Rather than make plants farmable, have them randomly respawn in jungle soil. You can only get them down there by foraging, not farming.
 minetest.register_abm({
 	label = "Primordial plant growth",
 	nodenames = {"df_primordial_items:dirt_with_jungle_grass"},

df_caverns/shared.lua

@@ -21,7 +21,19 @@ local c_wet_flowstone = df_caverns.node_id.wet_flowstone
 local c_webs = df_caverns.node_id.big_webs
 local c_webs_egg = df_caverns.node_id.big_webs_egg
 
-df_caverns.data_param2 = {}
+df_caverns.data_param2 = {} -- shared among all mapgens to reduce memory clutter
+
+df_caverns.get_biome_at_pos_list = {} -- a list of methods of the form function(pos, heat, humidity) to allow modpack-wide queries about what should grow where
+df_caverns.get_biome = function(pos)
+	local heat = minetest.get_heat(pos)
+	local humidity = minetest.get_humidity(pos)
+	for _, val in pairs(df_caverns.get_biome_at_pos_list) do
+		local biome = val(pos, heat, humidity)
+		if biome ~= nil then
+			return biome
+		end
+	end
+end
 
 -- prevent mapgen from using these nodes as a base for stalactites or stalagmites
 local dont_build_speleothems_on = {}

df_caverns/sunless_sea.lua

@@ -18,11 +18,11 @@ for node_name, node_def in pairs(minetest.registered_nodes) do
 	end
 end
 
-local mushroom_shrublist
+local towergoblin_shrublist
 local fungispore_shrublist
 
 if minetest.get_modpath("df_farming") then
-	mushroom_shrublist = {
+	towergoblin_shrublist = {
 		df_farming.spawn_plump_helmet_vm,
 		df_farming.spawn_plump_helmet_vm,
 		df_farming.spawn_dimple_cup_vm,
@@ -94,7 +94,22 @@ local hot_zone_boundary = 70
 local middle_zone_boundary = 50
 local cool_zone_boundary = 30
 
-local mushroom_cavern_floor = function(abs_cracks, vert_rand, vi, area, data, data_param2)
+table.insert(df_caverns.get_biome_at_pos_list, function(pos, heat, humidity)
+	if pos.y < df_caverns.config.sunless_sea_min or pos.y >= df_caverns.config.level3_min then
+		return nil
+	end
+	if heat > hot_zone_boundary then
+		return "barren" -- hot zone
+	elseif heat > middle_zone_boundary then
+		return "fungispore"
+	elseif heat > cool_zone_boundary then
+		return "towergoblin"
+	else
+		return "barren" -- cool zone
+	end
+end)
+
+local towergoblin_cavern_floor = function(abs_cracks, vert_rand, vi, area, data, data_param2)
 	local ystride = area.ystride
 	if abs_cracks < 0.1 then
 		df_caverns.stalagmites(abs_cracks, vert_rand, vi, area, data, data_param2, true)
@@ -105,7 +120,7 @@ local mushroom_cavern_floor = function(abs_cracks, vert_rand, vi, area, data, da
 			data[vi] = c_dirt_moss
 		end
 		if math.random() < 0.1 then
-			df_caverns.place_shrub(vi+ystride, area, data, data_param2, mushroom_shrublist)
+			df_caverns.place_shrub(vi+ystride, area, data, data_param2, towergoblin_shrublist)
 		elseif abs_cracks > 0.25 then
 			if math.random() < 0.01 then
 				df_trees.spawn_tower_cap_vm(vi+ystride, area, data)
@@ -269,7 +284,7 @@ local decorate_sunless_sea = function(minp, maxp, seed, vm, node_arrays, area, d
 				elseif heat > middle_zone_boundary then
 					fungispore_cavern_floor(abs_cracks, vert_rand, vi, area, data, data_param2)
 				elseif heat > cool_zone_boundary then
-					mushroom_cavern_floor(abs_cracks, vert_rand, vi, area, data, data_param2)
+					towergoblin_cavern_floor(abs_cracks, vert_rand, vi, area, data, data_param2)
 				else
 					cool_zone_floor(abs_cracks, vert_rand, vi, area, data, data_param2)
 				end