Move falling to builtin

builtin/builtin.lua

@@ -22,4 +22,5 @@ dofile(minetest.get_modpath("__builtin").."/auth.lua")
 dofile(minetest.get_modpath("__builtin").."/chatcommands.lua")
 dofile(minetest.get_modpath("__builtin").."/static_spawn.lua")
 dofile(minetest.get_modpath("__builtin").."/detached_inventory.lua")
+dofile(minetest.get_modpath("__builtin").."/falling.lua")
 

builtin/falling.lua

@@ -0,0 +1,136 @@
+-- Minetest: builtin/item.lua
+
+--
+-- Falling stuff
+--
+
+minetest.register_entity("__builtin:falling_node", {
+	initial_properties = {
+		physical = true,
+		collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
+		visual = "wielditem",
+		textures = {},
+		visual_size = {x=0.667, y=0.667},
+	},
+
+	nodename = "",
+
+	set_node = function(self, nodename)
+		self.nodename = nodename
+		local stack = ItemStack(nodename)
+		local itemtable = stack:to_table()
+		local itemname = nil
+		if itemtable then
+			itemname = stack:to_table().name
+		end
+		local item_texture = nil
+		local item_type = ""
+		if minetest.registered_items[itemname] then
+			item_texture = minetest.registered_items[itemname].inventory_image
+			item_type = minetest.registered_items[itemname].type
+		end
+		prop = {
+			is_visible = true,
+			textures = {nodename},
+		}
+		self.object:set_properties(prop)
+	end,
+
+	get_staticdata = function(self)
+		return self.nodename
+	end,
+
+	on_activate = function(self, staticdata)
+		self.nodename = staticdata
+		self.object:set_armor_groups({immortal=1})
+		--self.object:setacceleration({x=0, y=-10, z=0})
+		self:set_node(self.nodename)
+	end,
+
+	on_step = function(self, dtime)
+		-- Set gravity
+		self.object:setacceleration({x=0, y=-10, z=0})
+		-- Turn to actual sand when collides to ground or just move
+		local pos = self.object:getpos()
+		local bcp = {x=pos.x, y=pos.y-0.7, z=pos.z} -- Position of bottom center point
+		local bcn = minetest.env:get_node(bcp)
+		-- Note: walkable is in the node definition, not in item groups
+		if minetest.registered_nodes[bcn.name] and
+				minetest.registered_nodes[bcn.name].walkable then
+			local np = {x=bcp.x, y=bcp.y+1, z=bcp.z}
+			-- Check what's here
+			local n2 = minetest.env:get_node(np)
+			-- If it's not air or liquid, remove node and replace it with
+			-- it's drops
+			if n2.name ~= "air" and (not minetest.registered_nodes[n2.name] or
+					minetest.registered_nodes[n2.name].liquidtype == "none") then
+				local drops = minetest.get_node_drops(n2.name, "")
+				minetest.env:remove_node(np)
+				-- Add dropped items
+				local _, dropped_item
+				for _, dropped_item in ipairs(drops) do
+					minetest.env:add_item(np, dropped_item)
+				end
+				-- Run script hook
+				local _, callback
+				for _, callback in ipairs(minetest.registered_on_dignodes) do
+					callback(np, n2, nil)
+				end
+			end
+			-- Create node and remove entity
+			minetest.env:add_node(np, {name=self.nodename})
+			self.object:remove()
+		else
+			-- Do nothing
+		end
+	end
+})
+
+function spawn_falling_node(p, nodename)
+	obj = minetest.env:add_entity(p, "__builtin:falling_node")
+	obj:get_luaentity():set_node(nodename)
+end
+
+--
+-- Some common functions
+--
+
+function nodeupdate_single(p)
+	n = minetest.env:get_node(p)
+	if minetest.get_node_group(n.name, "falling_node") ~= 0 then
+		p_bottom = {x=p.x, y=p.y-1, z=p.z}
+		n_bottom = minetest.env:get_node(p_bottom)
+		-- Note: walkable is in the node definition, not in item groups
+		if minetest.registered_nodes[n_bottom.name] and
+				not minetest.registered_nodes[n_bottom.name].walkable then
+			minetest.env:remove_node(p)
+			spawn_falling_node(p, n.name)
+			nodeupdate(p)
+		end
+	end
+end
+
+function nodeupdate(p)
+	for x = -1,1 do
+	for y = -1,1 do
+	for z = -1,1 do
+		p2 = {x=p.x+x, y=p.y+y, z=p.z+z}
+		nodeupdate_single(p2)
+	end
+	end
+	end
+end
+
+--
+-- Global callbacks
+--
+
+function on_placenode(p, node)
+	nodeupdate(p)
+end
+minetest.register_on_placenode(on_placenode)
+
+function on_dignode(p, node)
+	nodeupdate(p)
+end
+minetest.register_on_dignode(on_dignode)

doc/lua_api.txt

@@ -456,6 +456,7 @@ Special groups
 - disable_jump: Player (and possibly other things) cannot jump from node
 - fall_damage_add_percent: damage speed = speed * (1 + value/100)
 - bouncy: value is bounce speed in percent
+- falling_node: if there is no walkable block under the node it will fall
 
 Known damage and digging time defining groups
 ----------------------------------------------

games/minimal/mods/default/init.lua

@@ -769,15 +769,15 @@ minetest.register_node("default:sand", {
 	description = "Sand",
 	tiles ={"default_sand.png"},
 	is_ground_content = true,
-	groups = {crumbly=3},
+	groups = {crumbly=3, falling_node=1},
 	sounds = default.node_sound_sand_defaults(),
 })
 
 minetest.register_node("default:gravel", {
 	description = "Gravel",
 	tiles ={"default_gravel.png"},
 	is_ground_content = true,
-	groups = {crumbly=2},
+	groups = {crumbly=2, falling_node=1},
 	sounds = default.node_sound_dirt_defaults({
 		footstep = {name="default_gravel_footstep", gain=0.45},
 	}),
@@ -1586,73 +1586,22 @@ minetest.register_alias("mapgen_stone_with_coal", "default:stone_with_coal")
 minetest.register_alias("mapgen_stone_with_iron", "default:stone_with_iron")
 minetest.register_alias("mapgen_mese", "default:mese")
 
---
--- Some common functions
---
-
-default.falling_node_names = {}
-
-function nodeupdate_single(p)
-	n = minetest.env:get_node(p)
-	if default.falling_node_names[n.name] ~= nil then
-		p_bottom = {x=p.x, y=p.y-1, z=p.z}
-		n_bottom = minetest.env:get_node(p_bottom)
-		if n_bottom.name == "air" then
-			minetest.env:remove_node(p)
-			minetest.env:add_entity(p, "default:falling_"..n.name)
-			nodeupdate(p)
-		end
-	end
-end
-
-function nodeupdate(p)
-	for x = -1,1 do
-	for y = -1,1 do
-	for z = -1,1 do
-		p2 = {x=p.x+x, y=p.y+y, z=p.z+z}
-		nodeupdate_single(p2)
-	end
-	end
-	end
+-- Support old code
+function default.spawn_falling_node(p, nodename)
+	spawn_falling_node(p, nodename)
 end
 
---
--- Falling stuff
---
-
+-- Horrible crap to support old code
+-- Don't use this and never do what this does, it's completely wrong!
+-- (More specifically, the client and the C++ code doesn't get the group)
 function default.register_falling_node(nodename, texture)
-	default.falling_node_names[nodename] = true
-	-- Override naming conventions for stuff like :default:falling_default:sand
-	minetest.register_entity(":default:falling_"..nodename, {
-		-- Static definition
-		physical = true,
-		collisionbox = {-0.5,-0.5,-0.5, 0.5,0.5,0.5},
-		visual = "cube",
-		textures = {texture,texture,texture,texture,texture,texture},
-		-- State
-		-- Methods
-		on_step = function(self, dtime)
-			-- Set gravity
-			self.object:setacceleration({x=0, y=-10, z=0})
-			-- Turn to actual sand when collides to ground or just move
-			local pos = self.object:getpos()
-			local bcp = {x=pos.x, y=pos.y-0.7, z=pos.z} -- Position of bottom center point
-			local bcn = minetest.env:get_node(bcp)
-			if bcn.name ~= "air" then
-				-- Turn to a sand node
-				local np = {x=bcp.x, y=bcp.y+1, z=bcp.z}
-				minetest.env:add_node(np, {name=nodename})
-				self.object:remove()
-			else
-				-- Do nothing
-			end
-		end
-	})
+	minetest.log("error", debug.traceback())
+	minetest.log('error', "WARNING: default.register_falling_node is deprecated")
+	if minetest.registered_nodes[nodename] then
+		minetest.registered_nodes[nodename].groups.falling_node = 1
+	end
 end
 
-default.register_falling_node("default:sand", "default_sand.png")
-default.register_falling_node("default:gravel", "default_gravel.png")
-
 --
 -- Global callbacks
 --
@@ -1665,13 +1614,11 @@ minetest.register_globalstep(on_step)
 
 function on_placenode(p, node)
 	--print("on_placenode")
-	nodeupdate(p)
 end
 minetest.register_on_placenode(on_placenode)
 
 function on_dignode(p, node)
 	--print("on_dignode")
-	nodeupdate(p)
 end
 minetest.register_on_dignode(on_dignode)