Fix https://git.minetest.land/Wuzzy/MineClone2/issues/1028 - Make tree saplings grow in inactive areas (approx. time calc.)

mods/ITEMS/mcl_core/functions.lua

@@ -899,19 +899,41 @@ local treelight = 9
 
 local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_two, sapling)
 	return function(pos)
+		local meta = minetest.get_meta(pos)
+		if meta:get("grown") then return end
 		-- Checks if the sapling at pos has enough light and the correct soil
-		local sapling_is_growable = function(pos)
 		local light = minetest.get_node_light(pos)
+		if not light then return end
+		local low_light = (light < treelight)
+
+		local delta = 1
+		local current_game_time = minetest.get_day_count() + minetest.get_timeofday()
+
+		local last_game_time = tonumber(meta:get_string("last_gametime"))
+		meta:set_string("last_gametime", tostring(current_game_time))
+
+		if last_game_time then
+			delta = current_game_time - last_game_time
+		elseif low_light then
+			return
+		end
+
+		if low_light then
+			if delta < 1.2 then return end
+			if minetest.get_node_light(pos, 0.5) < treelight then return end
+		end
+
+		-- TODO: delta is [days] missed in inactive area. Currently we just add it to stage, which is far from a perfect calculation...
+
 		local soilnode = minetest.get_node({x=pos.x, y=pos.y-1, z=pos.z})
 		local soiltype = minetest.get_item_group(soilnode.name, "soil_sapling")
-			return soiltype >= soil_needed and light and light >= treelight and not minetest.get_meta(pos):get("grown")
-		end
-		if sapling_is_growable(pos) then
+		if soiltype < soil_needed then return end
+
 		-- Increase and check growth stage
 		local meta = minetest.get_meta(pos)
 		local stage = meta:get_int("stage")
 		if stage == nil then stage = 0 end
-			stage = stage + 1
+		stage = stage + math.max(1, math.floor(delta))
 		if stage >= 3 then
 			meta:set_string("grown", "true")
 			-- This sapling grows in a special way when there are 4 saplings in a 2×2 pattern
@@ -968,7 +990,6 @@ local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_tw
 					return
 				end
 			end
-
 				if one_by_one and tree_id == OAK_TREE_ID then
 				-- There is a chance that this tree wants to grow as a balloon oak
 				if math.random(1, 12) == 1 then
@@ -980,7 +1001,6 @@ local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_tw
 					end
 				end
 			end
-
 				-- If this sapling can grow alone
 			if one_by_one and check_tree_growth(pos, tree_id) then
 				-- Single sapling
@@ -993,7 +1013,6 @@ local sapling_grow_action = function(tree_id, soil_needed, one_by_one, two_by_tw
 			meta:set_int("stage", stage)
 		end
 	end
-	end
 end
 
 local grow_oak = sapling_grow_action(OAK_TREE_ID, 1, true, false)
@@ -1040,7 +1059,14 @@ minetest.register_abm({
 	neighbors = {"group:soil_sapling"},
 	interval = 25,
 	chance = 2,
-	action = grow_oak,
+	action = grow_oak
+})
+minetest.register_lbm({
+	label = "Add growth for unloaded oak tree",
+	name = "mcl_core:lbm_oak",
+	nodenames = {"mcl_core:sapling"},
+	run_at_every_load = true,
+	action = grow_oak
 })
 
 -- Dark oak tree
@@ -1050,7 +1076,14 @@ minetest.register_abm({
 	neighbors = {"group:soil_sapling"},
 	interval = 25,
 	chance = 2,
-	action = grow_dark_oak,
+	action = grow_dark_oak
+})
+minetest.register_lbm({
+	label = "Add growth for unloaded dark oak tree",
+	name = "mcl_core:lbm_dark_oak",
+	nodenames = {"mcl_core:darksapling"},
+	run_at_every_load = true,
+	action = grow_dark_oak
 })
 
 -- Jungle Tree
@@ -1060,7 +1093,14 @@ minetest.register_abm({
 	neighbors = {"group:soil_sapling"},
 	interval = 25,
 	chance = 2,
-	action = grow_jungle_tree,
+	action = grow_jungle_tree
+})
+minetest.register_lbm({
+	label = "Add growth for unloaded jungle tree",
+	name = "mcl_core:lbm_jungle_tree",
+	nodenames = {"mcl_core:junglesapling"},
+	run_at_every_load = true,
+	action = grow_jungle_tree
 })
 
 -- Spruce tree
@@ -1072,6 +1112,13 @@ minetest.register_abm({
 	chance = 2,
 	action = grow_spruce
 })
+minetest.register_lbm({
+	label = "Add growth for unloaded spruce tree",
+	name = "mcl_core:lbm_spruce",
+	nodenames = {"mcl_core:sprucesapling"},
+	run_at_every_load = true,
+	action = grow_spruce
+})
 
 -- Birch tree
 minetest.register_abm({
@@ -1080,7 +1127,14 @@ minetest.register_abm({
 	neighbors = {"group:soil_sapling"},
 	interval = 25,
 	chance = 2,
-	action = grow_birch,
+	action = grow_birch
+})
+minetest.register_lbm({
+	label = "Add growth for unloaded birch tree",
+	name = "mcl_core:lbm_birch",
+	nodenames = {"mcl_core:birchsapling"},
+	run_at_every_load = true,
+	action = grow_spruce
 })
 
 -- Acacia tree
@@ -1090,7 +1144,14 @@ minetest.register_abm({
 	neighbors = {"group:soil_sapling"},
 	interval = 20,
 	chance = 2,
-	action = grow_acacia,
+	action = grow_acacia
+})
+minetest.register_lbm({
+	label = "Add growth for unloaded acacia tree",
+	name = "mcl_core:lbm_acacia",
+	nodenames = {"mcl_core:acaciasapling"},
+	run_at_every_load = true,
+	action = grow_spruce
 })
 
 local function leafdecay_particles(pos, node)