Generate deepslate instead of stone in low mg

mods/CORE/mcl_worlds/init.lua

@@ -36,7 +36,7 @@ end
 --     nil, "void"
 function mcl_worlds.y_to_layer(y)
 	if y >= mcl_vars.mg_overworld_min then
-		return y - mcl_vars.mg_overworld_min, "overworld"
+		return y - mcl_vars.mg_overworld_min_old, "overworld"
 	elseif y >= mcl_vars.mg_nether_min and y <= mcl_vars.mg_nether_max+128 then
 		return y - mcl_vars.mg_nether_min, "nether"
 	elseif y >= mcl_vars.mg_end_min and y <= mcl_vars.mg_end_max then
@@ -62,7 +62,7 @@ local pos_to_dimension = mcl_worlds.pos_to_dimension
 -- mc_dimension is one of "overworld", "nether", "end" (default: "overworld").
 function mcl_worlds.layer_to_y(layer, mc_dimension)
 	   if mc_dimension == "overworld" or mc_dimension == nil then
-			   return layer + mcl_vars.mg_overworld_min
+			   return layer + mcl_vars.mg_overworld_min_old
 	   elseif mc_dimension == "nether" then
 			   return layer + mcl_vars.mg_nether_min
 	   elseif mc_dimension == "end" then

mods/MAPGEN/mcl_biomes/init.lua

@@ -1517,11 +1517,21 @@ local function register_biomes()
 			name = biome .. "_underground",
 			heat_point = minetest.registered_biomes[biome].heat_point,
 			humidity_point = minetest.registered_biomes[biome].humidity_point,
-			y_min = mcl_vars.mg_overworld_min,
+			y_min = mcl_vars.mg_overworld_min_old,
 			y_max = DEEP_OCEAN_MIN - 1,
 			_mcl_biome_type = minetest.registered_biomes[biome]._mcl_biome_type,
 			_mcl_palette_index = minetest.registered_biomes[biome]._mcl_palette_index,
 		})
+		minetest.register_biome({
+			name = biome .. "_deep_underground",
+			heat_point = minetest.registered_biomes[biome].heat_point,
+			humidity_point = minetest.registered_biomes[biome].humidity_point,
+			node_stone = "mcl_deepslate:deepslate",
+			y_min = mcl_vars.mg_overworld_min,
+			y_max = mcl_vars.mg_overworld_min_old,
+			_mcl_biome_type = minetest.registered_biomes[biome]._mcl_biome_type,
+			_mcl_palette_index = minetest.registered_biomes[biome]._mcl_palette_index,
+		})
 
 	end
 end

mods/MAPGEN/mcl_mapgen_core/ores.lua

@@ -127,26 +127,25 @@ minetest.register_ore({
 	}
 })
 
-
 minetest.register_ore({
-    ore_type       = "blob",
-    ore            = "mcl_deepslate:deepslate",
-    wherein        = { "mcl_core:stone" },
-    clust_scarcity = 200,
-    clust_num_ores = 100,
-    clust_size     = 10,
-    y_min          = deepslate_min,
-    y_max          = deepslate_max,
-    noise_params = {
-        offset  = 0,
-        scale   = 1,
-        spread  = { x = 250, y = 250, z = 250 },
-        seed    = 12345,
-        octaves = 3,
-        persist = 0.6,
-        lacunarity = 2,
-        flags = "defaults",
-    }
+	ore_type       = "blob",
+	ore            = "mcl_deepslate:deepslate",
+	wherein        = { "mcl_core:stone" },
+	clust_scarcity = 200,
+	clust_num_ores = 100,
+	clust_size     = 10,
+	y_min          = mcl_vars.mg_overworld_min_old,
+	y_max          = deepslate_max,
+	noise_params = {
+		offset  = 0,
+		scale   = 1,
+		spread  = { x = 250, y = 250, z = 250 },
+		seed    = 12345,
+		octaves = 3,
+		persist = 0.6,
+		lacunarity = 2,
+		flags = "defaults",
+	}
 })
 
 minetest.register_ore({