Add option to forego real entities (#26)

default_settings.lua

@@ -27,6 +27,7 @@ local settings = {
 	enable_cyclic_mode = true,
 	drop_on_routing_fail = false,
 	delete_item_on_clearobject = true,
+	use_real_entities = true,
 }
 
 pipeworks.toggles = {}

luaentity.lua

@@ -73,9 +73,13 @@ local function get_blockpos(pos)
 	        z = math.floor(pos.z / 16)}
 end
 
+local move_entities_globalstep_part1
+local is_active
+
+if pipeworks.use_real_entities then
 	local active_blocks = {} -- These only contain active blocks near players (i.e., not forceloaded ones)
 
-local move_entities_globalstep_part1 = function(dtime)
+	move_entities_globalstep_part1 = function(dtime)
 		local active_block_range = tonumber(minetest.settings:get("active_block_range")) or 2
 		local new_active_blocks = {}
 		for _, player in ipairs(minetest.get_connected_players()) do
@@ -96,9 +100,17 @@ local move_entities_globalstep_part1 = function(dtime)
 		-- todo: callbacks on block load/unload
 	end
 
-local function is_active(pos)
+	is_active = function(pos)
 		return active_blocks[minetest.hash_node_position(get_blockpos(pos))] ~= nil
 	end
+else
+	move_entities_globalstep_part1 = function()
+	end
+
+	is_active = function()
+		return false
+	end
+end
 
 local entitydef_default = {
 	_attach = function(self, attached, attach_to)

settingtypes.txt

@@ -75,3 +75,6 @@ pipeworks_drop_on_routing_fail (Drop On Routing Fail) bool false
 
 #Delete item on clearobject.
 pipeworks_delete_item_on_clearobject (Delete Item On Clearobject) bool true
+
+#Use real visible entities in tubes within active areas.
+pipeworks_use_real_entities (Use real entities) bool true