Merge pull request 'Refactor leaf decay mechanics.' (#3099) from refactor-leaves into master

Reviewed-on: https://git.minetest.land/MineClone2/MineClone2/pulls/3099
Reviewed-by: ancientmarinerdev <ancientmariner_dev@proton.me>

GROUPS.md

@@ -74,6 +74,8 @@ Please read <http://minecraft.gamepedia.com/Breaking> to learn how digging times
 * `coral_species=X`: Specifies the species of a coral; equal X means equal species
 * `set_on_fire=X`: Sets any (not fire-resistant) mob or player on fire for X seconds when touching
 * `compostability=X`: Item can be used on a composter block; X (1-100) is the % chance of adding a level of compost
+* `leaves=X`: Node will spotaneously decay if no tree trunk nodes remain within 6 blocks distance.
+* `leaves_orphan`: See above, these nodes are in the process of decayed.
 
 #### Footnotes
 

mods/ITEMS/mcl_core/functions.lua

@@ -1367,90 +1367,29 @@ function mcl_core.supports_vines(nodename)
 end
 
 -- Leaf Decay
-
--- To enable leaf decay for a node, add it to the "leafdecay" group.
 --
--- The rating of the group determines how far from a node in the group "tree"
--- the node can be without decaying.
+-- Whenever a tree trunk node is removed, all `group:leaves` nodes in a radius
+-- of 6 blocks are checked from the trunk node's `after_destruct` handler.
+-- Any such nodes within that radius that has no trunk node present within a
+-- distance of 6 blocks is replaced with a `group:orphan_leaves` node.
 --
--- If param2 of the node is ~= 0, the node will always be preserved. Thus, if
--- the player places a node of that kind, you will want to set param2=1 or so.
---
-
-mcl_core.leafdecay_trunk_cache = {}
-mcl_core.leafdecay_enable_cache = true
--- Spread the load of finding trunks
-mcl_core.leafdecay_trunk_find_allow_accumulator = 0
-
-minetest.register_globalstep(function(dtime)
-	--local finds_per_second = 5000
-	mcl_core.leafdecay_trunk_find_allow_accumulator = math.floor(dtime * 5000)
-end)
-
+-- The `group:orphan_leaves` nodes are gradually decayed in this ABM.
 minetest.register_abm({
 	label = "Leaf decay",
-	nodenames = {"group:leafdecay"},
-	neighbors = {"air", "group:liquid"},
-	-- A low interval and a high inverse chance spreads the load
-	interval = 2,
-	chance = 5,
-
-	action = function(p0, node, _, _)
-		local do_preserve = false
-		local d = minetest.registered_nodes[node.name].groups.leafdecay
-		if not d or d == 0 then
-			return
-		end
-		local n0 = minetest.get_node(p0)
-		if n0.param2 ~= 0 then
-			-- Prevent leafdecay for player-placed leaves.
-			-- param2 is set to 1 after it was placed by the player
-			return
-		end
-		local p0_hash = nil
-		if mcl_core.leafdecay_enable_cache then
-			p0_hash = minetest.hash_node_position(p0)
-			local trunkp = mcl_core.leafdecay_trunk_cache[p0_hash]
-			if trunkp then
-				local n = minetest.get_node(trunkp)
-				local reg = minetest.registered_nodes[n.name]
-				-- Assume ignore is a trunk, to make the thing work at the border of the active area
-				if n.name == "ignore" or (reg and reg.groups.tree and reg.groups.tree ~= 0) then
-					return
-				end
-				-- Cache is invalid
-				table.remove(mcl_core.leafdecay_trunk_cache, p0_hash)
-			end
-		end
-		if mcl_core.leafdecay_trunk_find_allow_accumulator <= 0 then
-			return
-		end
-		mcl_core.leafdecay_trunk_find_allow_accumulator =
-				mcl_core.leafdecay_trunk_find_allow_accumulator - 1
-		-- Assume ignore is a trunk, to make the thing work at the border of the active area
-		local p1 = minetest.find_node_near(p0, d, {"ignore", "group:tree"})
-		if p1 then
-			do_preserve = true
-			if mcl_core.leafdecay_enable_cache then
-				-- Cache the trunk
-				mcl_core.leafdecay_trunk_cache[p0_hash] = p1
-			end
-		end
-		if not do_preserve then
-			-- Drop stuff other than the node itself
-			local itemstacks = minetest.get_node_drops(n0.name)
+	nodenames = {"group:orphan_leaves"},
+	interval = 5,
+	chance = 10,
+		action = function(pos, node)
+		-- Spawn item entities for any of the leaf's drops
+		local itemstacks = minetest.get_node_drops(node.name)
 		for _, itemname in pairs(itemstacks) do
-				local p_drop = {
-					x = p0.x - 0.5 + math.random(),
-					y = p0.y - 0.5 + math.random(),
-					z = p0.z - 0.5 + math.random(),
-				}
+			local p_drop = vector.offset(pos, math.random() - 0.5, math.random() - 0.5, math.random() - 0.5)
 			minetest.add_item(p_drop, itemname)
 		end
-			-- Remove node
-			minetest.remove_node(p0)
-			leafdecay_particles(p0, n0)
-			minetest.check_for_falling(p0)
+		-- Remove the decayed node
+		minetest.remove_node(pos)
+		leafdecay_particles(pos, node)
+		minetest.check_for_falling(pos)
 
 		-- Kill depending vines immediately to skip the vines decay delay
 		local surround = {
@@ -1461,7 +1400,7 @@ minetest.register_abm({
 			{ x = 0, y = -1, z = -1 },
 		}
 		for s=1, #surround do
-				local spos = vector.add(p0, surround[s])
+			local spos = vector.add(pos, surround[s])
 			local maybe_vine = minetest.get_node(spos)
 			--local surround_inverse = vector.multiply(surround[s], -1)
 			if maybe_vine.name == "mcl_core:vine" and (not mcl_core.check_vines_supported(spos, maybe_vine)) then
@@ -1471,7 +1410,6 @@ minetest.register_abm({
 			end
 		end
 	end
-	end
 })
 
 -- Remove vines which are not supported by anything, similar to leaf decay.

mods/ITEMS/mcl_core/nodes_trees.lua

@@ -8,6 +8,40 @@ if mod_screwdriver then
 	on_rotate = screwdriver.rotate_3way
 end
 
+-- Check dug/destroyed tree trunks for orphaned leaves.
+--
+-- This function is meant to be called by the `after_destruct` handler of
+-- treetrunk nodes.
+--
+-- Whenever a trunk node is removed, all `group:leaves` nodes in a sphere
+-- with radius 6 are checked.  Every such node that does not have a trunk
+-- node within a distance of 6 blocks is converted into a orphan leaf node.
+-- An ABM will gradually decay these nodes.
+--
+-- If param2 of the node is set to a nonzero value, the node will always
+-- be preserved.  This is set automatically when leaves are placed manually.
+--
+-- @param pos the position of the removed trunk node.
+-- @param oldnode the node table of the removed trunk node.
+function mcl_core.update_leaves(pos, oldnode)
+	local pos1, pos2 = vector.offset(pos, -6, -6, -6), vector.offset(pos, 6, 6, 6)
+	local lnode
+	local leaves = minetest.find_nodes_in_area(pos1, pos2, "group:leaves")
+	for _, lpos in pairs(leaves) do
+		lnode = minetest.get_node(lpos)
+		-- skip already decaying leaf nodes
+		if minetest.get_item_group(lnode.name, "orphan_leaves") ~= 1 then
+			if not minetest.find_node_near(lpos, 6, "group:tree") then
+				-- manually placed leaf nodes have param2
+				-- set and will never decay automatically
+				if lnode.param2 == 0 then
+					minetest.swap_node(lpos, {name = lnode.name .. "_orphan"})
+				end
+			end
+		end
+	end
+end
+
 -- Register tree trunk (wood) and bark
 local function register_tree_trunk(subname, description_trunk, description_bark, longdesc, tile_inner, tile_bark, stripped_variant)
 	minetest.register_node("mcl_core:"..subname, {
@@ -17,6 +51,7 @@ local function register_tree_trunk(subname, description_trunk, description_bark,
 		tiles = {tile_inner, tile_inner, tile_bark},
 		paramtype2 = "facedir",
 		on_place = mcl_util.rotate_axis,
+		after_destruct = mcl_core.update_leaves,
 		stack_max = 64,
 		groups = {handy=1,axey=1, tree=1, flammable=2, building_block=1, material_wood=1, fire_encouragement=5, fire_flammability=5},
 		sounds = mcl_sounds.node_sound_wood_defaults(),
@@ -107,10 +142,7 @@ local function register_wooden_planks(subname, description, tiles)
 	})
 end
 
-local function register_leaves(subname, description, longdesc, tiles, sapling, drop_apples, sapling_chances, leafdecay_distance)
-	if leafdecay_distance == nil then
-		leafdecay_distance = 4
-	end
+local function register_leaves(subname, description, longdesc, tiles, sapling, drop_apples, sapling_chances)
 	local apple_chances = {200, 180, 160, 120, 40}
 	local stick_chances = {50, 45, 30, 35, 10}
 
@@ -141,7 +173,7 @@ local function register_leaves(subname, description, longdesc, tiles, sapling, d
 		return drop
 	end
 
-	minetest.register_node("mcl_core:"..subname, {
+	local l_def = {
 		description = description,
 		_doc_items_longdesc = longdesc,
 		_doc_items_hidden = false,
@@ -153,9 +185,8 @@ local function register_leaves(subname, description, longdesc, tiles, sapling, d
 		stack_max = 64,
 		groups = {
 			handy = 1, hoey = 1, shearsy = 1, swordy = 1, dig_by_piston = 1,
-			leaves = 1, leafdecay = leafdecay_distance, deco_block = 1,
 			flammable = 2, fire_encouragement = 30, fire_flammability = 60,
-			compostability = 30
+			leaves = 1, deco_block = 1, compostability = 30
 		},
 		drop = get_drops(0),
 		_mcl_shears_drop = true,
@@ -164,7 +195,19 @@ local function register_leaves(subname, description, longdesc, tiles, sapling, d
 		_mcl_hardness = 0.2,
 		_mcl_silk_touch_drop = true,
 		_mcl_fortune_drop = { get_drops(1), get_drops(2), get_drops(3), get_drops(4) },
-	})
+	}
+
+	minetest.register_node("mcl_core:" .. subname, l_def)
+
+	local o_def = table.copy(l_def)
+	o_def._doc_items_create_entry = false
+	o_def.place_param2 = nil
+	o_def.groups.not_in_creative_inventory = 1
+	o_def.groups.orphan_leaves = 1
+	o_def._mcl_shears_drop = {"mcl_core:" .. subname}
+	o_def._mcl_silk_touch_drop = {"mcl_core:" .. subname}
+
+	minetest.register_node("mcl_core:" .. subname .. "_orphan", o_def)
 end
 
 local function register_sapling(subname, description, longdesc, tt_help, texture, selbox)

mods/ITEMS/mcl_mangrove/init.lua

@@ -52,9 +52,9 @@ minetest.register_node("mcl_mangrove:mangrove_tree", {
 	tiles = {"mcl_mangrove_log_top.png", "mcl_mangrove_log_top.png", "mcl_mangrove_log.png"},
 	paramtype2 = "facedir",
 	on_place = mcl_util.rotate_axis,
+	after_destruct = mcl_core.update_leaves,
 	groups = {handy=1,axey=1, tree=1, flammable=2, building_block=1, material_wood=1, fire_encouragement=5, fire_flammability=5},
 	sounds = mcl_sounds.node_sound_wood_defaults(),
-	on_place = mcl_util.rotate_axis,
 	_mcl_blast_resistance = 2,
 	_mcl_hardness = 2,
 	_mcl_stripped_variant = "mcl_mangrove:mangrove_stripped_trunk",
@@ -86,7 +86,7 @@ minetest.register_node("mcl_mangrove:mangrove_wood", {
 	_mcl_hardness = 2,
 })
 
-minetest.register_node("mcl_mangrove:mangroveleaves", {
+local l_def = {
 	description = S("Mangrove Leaves"),
 	_doc_items_longdesc = S("mangrove leaves are grown from mangrove trees."),
 	_doc_items_hidden = false,
@@ -95,7 +95,11 @@ minetest.register_node("mcl_mangrove:mangroveleaves", {
 	place_param2 = 1, -- Prevent leafdecay for placed nodes
 	tiles = {"mcl_mangrove_leaves.png"},
 	paramtype = "light",
-	groups = {handy=1,shearsy=1,swordy=1, leafdecay=10, flammable=2, leaves=1, deco_block=1, dig_by_piston=1, fire_encouragement=30, fire_flammability=60},
+	groups = {
+		handy = 1, hoey = 1, shearsy = 1, swordy = 1, dig_by_piston = 1,
+		flammable = 2, fire_encouragement = 30, fire_flammability = 60,
+		leaves = 1, deco_block = 1, compostability = 30
+	},
 	drop = get_drops(0),
 	_mcl_shears_drop = true,
 	sounds = mcl_sounds.node_sound_leaves_defaults(),
@@ -103,7 +107,19 @@ minetest.register_node("mcl_mangrove:mangroveleaves", {
 	_mcl_hardness = 0.2,
 	_mcl_silk_touch_drop = true,
 	_mcl_fortune_drop = { get_drops(1), get_drops(2), get_drops(3), get_drops(4) },
-})
+}
+
+minetest.register_node("mcl_mangrove:mangroveleaves", l_def)
+
+local o_def = table.copy(l_def)
+o_def._doc_items_create_entry = false
+o_def.place_param2 = nil
+o_def.groups.not_in_creative_inventory = 1
+o_def.groups.orphan_leaves = 1
+o_def._mcl_shears_drop = {"mcl_mangrove:mangroveleaves"}
+o_def._mcl_silk_touch_drop = {"mcl_mangrove:mangroveleaves"}
+
+minetest.register_node("mcl_mangrove:mangroveleaves_orphan", o_def)
 
 minetest.register_node("mcl_mangrove:mangrove_stripped_trunk", {
 	description = S("Stripped Mangrove Wood"),
@@ -147,11 +163,13 @@ minetest.register_node("mcl_mangrove:mangrove_roots", {
 	drawtype = "allfaces_optional",
 	groups = {
 		handy = 1, hoey = 1, shearsy = 1, axey = 1, swordy = 1, dig_by_piston = 0,
-		leaves = 1, deco_block = 1,flammable = 10, fire_encouragement = 30, fire_flammability = 60,	compostability = 30
+		flammable = 10, fire_encouragement = 30, fire_flammability = 60,
+		deco_block = 1, compostability = 30
 	},
 	drop = "mcl_mangrove:mangrove_roots",
 	_mcl_shears_drop = true,
-	sounds = mcl_sounds.node_sound_leaves_defaults(),			_mcl_blast_resistance = 0.7,
+	sounds = mcl_sounds.node_sound_leaves_defaults(),
+	_mcl_blast_resistance = 0.7,
 	_mcl_hardness = 0.7,
 	_mcl_silk_touch_drop = true,
 	_mcl_fortune_drop = { "mcl_mangrove:mangrove_roots 1", "mcl_mangrove:mangrove_roots 2", "mcl_mangrove:mangrove_roots 3", "mcl_mangrove:mangrove_roots 4" },
@@ -329,6 +347,9 @@ local wlroots = {
 	end,
 }
 local rwlroots = table.copy(wlroots)
+-- FIXME luacheck complains that this is a repeated definition of water_tex.
+-- Maybe the tiles definition below should be replaced with the animated tile
+-- definition as per above?
 water_tex = "default_river_water_source_animated.png^[verticalframe:16:0"
 rwlroots.tiles = {
 	"("..water_tex..")^mcl_mangrove_roots_top.png",