Builtin: localize a few functions

builtin/game/falling.lua

@@ -1,7 +1,8 @@
 -- Minetest: builtin/item.lua
 
-local random, pi = math.random, math.pi
-local vnew, vround, vadd, vapply = vector.new, vector.round, vector.add, vector.apply
+local abs, random, pi = math.abs, math.random, math.pi
+local vnew, vround, vadd, vapply, vsubtract =
+	vector.new, vector.round, vector.add, vector.apply, vector.subtract
 
 local builtin_shared = ...
 local SCALE = 0.667
@@ -369,7 +370,7 @@ core.register_entity(":__builtin:falling_node", {
 		local failure = false
 
 		local pos = self.object:get_pos()
-		local distance = vapply(vector.subtract(pos, bcp), math.abs)
+		local distance = vapply(vsubtract(pos, bcp), abs)
 		if distance.x >= 1 or distance.z >= 1 then
 			-- We're colliding with some part of a node that's sticking out
 			-- Since we don't want to visually teleport, drop as item

builtin/game/forceloading.lua

@@ -12,11 +12,12 @@ local total_forceloaded = 0
 local forceload_blocks_changed = false
 
 local BLOCKSIZE = core.MAP_BLOCKSIZE
+local floor = math.floor
 local function get_blockpos(pos)
 	return {
-		x = math.floor(pos.x/BLOCKSIZE),
-		y = math.floor(pos.y/BLOCKSIZE),
-		z = math.floor(pos.z/BLOCKSIZE)}
+		x = floor(pos.x/BLOCKSIZE),
+		y = floor(pos.y/BLOCKSIZE),
+		z = floor(pos.z/BLOCKSIZE)}
 end
 
 -- When we create/free a forceload, it's either transient or persistent. We want

builtin/game/item_entity.lua

@@ -1,7 +1,7 @@
 -- Minetest: builtin/item_entity.lua
 
 local abs, min, floor, random, pi = math.abs, math.min, math.floor, math.random, math.pi
-local vnormalize = vector.normalize
+local vadd, vnormalize = vector.add, vector.normalize
 
 function core.spawn_item(pos, item)
 	-- Take item in any format
@@ -276,7 +276,7 @@ core.register_entity(":__builtin:item", {
 
 			-- Check which one of the 4 sides is free
 			for o = 1, #order do
-				local cnode = core.get_node(vector.add(pos, order[o])).name
+				local cnode = core.get_node(vadd(pos, order[o])).name
 				local cdef = core.registered_nodes[cnode] or {}
 				if cnode ~= "ignore" and cdef.walkable == false then
 					shootdir = order[o]
@@ -286,7 +286,7 @@ core.register_entity(":__builtin:item", {
 			-- If none of the 4 sides is free, check upwards
 			if not shootdir then
 				shootdir = {x=0, y=1, z=0}
-				local cnode = core.get_node(vector.add(pos, shootdir)).name
+				local cnode = core.get_node(vadd(pos, shootdir)).name
 				if cnode == "ignore" then
 					shootdir = nil -- Do not push into ignore
 				end

builtin/game/knockback.lua

@@ -1,4 +1,5 @@
 -- can be overriden by mods
+local exp = math.exp
 function core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, distance, damage)
 	if damage == 0 or player:get_armor_groups().immortal then
 		return 0.0
@@ -7,7 +8,7 @@ function core.calculate_knockback(player, hitter, time_from_last_punch, tool_cap
 	local m = 8
 	-- solve m - m*e^(k*4) = 4 for k
 	local k = -0.17328
-	local res = m - m * math.exp(k * damage)
+	local res = m - m * exp(k * damage)
 
 	if distance < 2.0 then
 		res = res * 1.1 -- more knockback when closer
@@ -22,6 +23,7 @@ local function vector_absmax(v)
 	return max(max(abs(v.x), abs(v.y)), abs(v.z))
 end
 
+local vdivide, vlength, vsubtract = vector.divide, vector.length, vector.subtract
 core.register_on_punchplayer(function(player, hitter, time_from_last_punch, tool_capabilities, unused_dir, damage)
 	if player:get_hp() == 0 then
 		return -- RIP
@@ -29,10 +31,10 @@ core.register_on_punchplayer(function(player, hitter, time_from_last_punch, tool
 
 	-- Server::handleCommand_Interact() adds eye offset to one but not the other
 	-- so the direction is slightly off, calculate it ourselves
-	local dir = vector.subtract(player:get_pos(), hitter:get_pos())
-	local d = vector.length(dir)
+	local dir = vsubtract(player:get_pos(), hitter:get_pos())
+	local d = vlength(dir)
 	if d ~= 0.0 then
-		dir = vector.divide(dir, d)
+		dir = vdivide(dir, d)
 	end
 
 	local k = core.calculate_knockback(player, hitter, time_from_last_punch, tool_capabilities, dir, d, damage)

builtin/game/misc.lua

@@ -1,5 +1,7 @@
 -- Minetest: builtin/misc.lua
 
+local ceil, floor = math.ceil, math.floor
+
 --
 -- Misc. API functions
 --
@@ -139,9 +141,9 @@ end
 function core.get_position_from_hash(hash)
 	local pos = {}
 	pos.x = (hash % 65536) - 32768
-	hash  = math.floor(hash / 65536)
+	hash  = floor(hash / 65536)
 	pos.y = (hash % 65536) - 32768
-	hash  = math.floor(hash / 65536)
+	hash  = floor(hash / 65536)
 	pos.z = (hash % 65536) - 32768
 	return pos
 end
@@ -173,7 +175,7 @@ end
 
 -- See l_env.cpp for the other functions
 function core.get_artificial_light(param1)
-	return math.floor(param1 / 16)
+	return floor(param1 / 16)
 end
 
 
@@ -220,18 +222,18 @@ function core.is_area_protected(minp, maxp, player_name, interval)
 
 		if maxp[c] > minp[c] then
 			d[c] = (maxp[c] - minp[c]) /
-				math.ceil((maxp[c] - minp[c]) / interval) - 1e-4
+				ceil((maxp[c] - minp[c]) / interval) - 1e-4
 		else
 			d[c] = 1 -- Any value larger than 0 to avoid division by zero
 		end
 	end
 
 	for zf = minp.z, maxp.z, d.z do
-		local z = math.floor(zf + 0.5)
+		local z = floor(zf + 0.5)
 		for yf = minp.y, maxp.y, d.y do
-			local y = math.floor(yf + 0.5)
+			local y = floor(yf + 0.5)
 			for xf = minp.x, maxp.x, d.x do
-				local x = math.floor(xf + 0.5)
+				local x = floor(xf + 0.5)
 				local pos = {x = x, y = y, z = z}
 				if core.is_protected(pos, player_name) then
 					return pos