From da149d5a587eca29d78190ce34e661ab5d87be0d Mon Sep 17 00:00:00 2001
From: Wuzzy <Wuzzy2@mail.ru>
Date: Wed, 2 Oct 2019 22:06:26 +0200
Subject: [PATCH] Apply more checks in igloo basement generation

---
 mods/MAPGEN/mcl_structures/init.lua | 33 ++++++++++++++++++++++-------
 1 file changed, 25 insertions(+), 8 deletions(-)

diff --git a/mods/MAPGEN/mcl_structures/init.lua b/mods/MAPGEN/mcl_structures/init.lua
index 132c7089..0c01a788 100644
--- a/mods/MAPGEN/mcl_structures/init.lua
+++ b/mods/MAPGEN/mcl_structures/init.lua
@@ -78,16 +78,23 @@ end
 
 mcl_structures.generate_igloo = function(pos)
 	-- TODO: Check if we're allowed to destroy nodes
-	-- FIXME: Some nodes (water, ice) don't get overwritten by ladder
-	-- FIXME: Nodes at Y=0 don't get overwritten by ladder
-	-- FIXME: Apply basement height limit in other dimensions
 	-- TODO: Check if basement generation would not be too obvious
 	-- TODO: Generate basement with 50% chance only
 	local success, rotation = mcl_structures.generate_igloo_top(pos)
 	if success then
-		local buffer = pos.y - (mcl_vars.mg_lava_overworld_max + 10)
+		local dim = mcl_worlds.pos_to_dimension(pos)
+		buffer = pos.y - (mcl_vars.mg_lava_overworld_max + 10)
+		if dim == "nether" then
+			buffer = pos.y - (mcl_vars.mg_lava_nether_max + 10)
+		elseif dim == "end" then
+			buffer = pos.y - (mcl_vars.mg_end_min + 1)
+		elseif dim == "overworld" then
+			buffer = pos.y - (mcl_vars.mg_lava_overworld_max + 10)
+		else
+			return success
+		end
 		if buffer <= 19 then
-			return
+			return success
 		end
 		local depth = math.random(19, buffer)
 		local bpos = {x=pos.x, y=pos.y-depth, z=pos.z}
@@ -113,8 +120,6 @@ mcl_structures.generate_igloo = function(pos)
 		else
 			return success
 		end
-		-- TODO: more reliable param2
-		minetest.set_node(tpos, {name="mcl_doors:trapdoor", param2=20+minetest.dir_to_facedir(dir)})
 		local set_brick = function(pos)
 			local c = math.random(1, 3) -- cracked chance
 			local m = math.random(1, 10) -- chance for monster egg
@@ -135,14 +140,26 @@ mcl_structures.generate_igloo = function(pos)
 			minetest.set_node(pos, {name=brick})
 		end
 		local ladder_param2 = minetest.dir_to_wallmounted(tdir)
+		local real_depth = 0
 		for y=1, depth-5 do
+			real_depth = real_depth + 1
+			local node = minetest.get_node({x=tpos.x,y=tpos.y-y,z=tpos.z})
+			local def = minetest.registered_nodes[node.name]
+			if (not def) or (not def.walkable) or (def.liquidtype ~= "none") then
+				bpos.y = tpos.y-y-4
+				break
+			end
 			set_brick({x=tpos.x-1,y=tpos.y-y,z=tpos.z  })
 			set_brick({x=tpos.x+1,y=tpos.y-y,z=tpos.z  })
 			set_brick({x=tpos.x  ,y=tpos.y-y,z=tpos.z-1})
 			set_brick({x=tpos.x  ,y=tpos.y-y,z=tpos.z+1})
 			minetest.set_node({x=tpos.x,y=tpos.y-y,z=tpos.z}, {name="mcl_core:ladder", param2=ladder_param2})
 		end
-		mcl_structures.generate_igloo_basement(bpos, rotation)
+		if real_depth > 1 then
+			-- TODO: more reliable param2
+			minetest.set_node(tpos, {name="mcl_doors:trapdoor", param2=20+minetest.dir_to_facedir(dir)})
+			mcl_structures.generate_igloo_basement(bpos, rotation)
+		end
 	end
 	return success
 end