Add callback on_mapblocks_changed

builtin/game/misc_s.lua

@@ -8,10 +8,9 @@
 -- Misc. API functions
 --
 
+-- This must match the implementation in src/script/common/c_converter.h
 function core.hash_node_position(pos)
-	return (pos.z + 32768) * 65536 * 65536
-		 + (pos.y + 32768) * 65536
-		 +  pos.x + 32768
+	return (pos.z + 0x8000) * 0x100000000 + (pos.y + 0x8000) * 0x10000 + (pos.x + 0x8000)
 end
 
 

builtin/game/register.lua

@@ -633,6 +633,17 @@ core.registered_on_player_inventory_actions, core.register_on_player_inventory_a
 core.registered_allow_player_inventory_actions, core.register_allow_player_inventory_action = make_registration()
 core.registered_on_rightclickplayers, core.register_on_rightclickplayer = make_registration()
 core.registered_on_liquid_transformed, core.register_on_liquid_transformed = make_registration()
+core.registered_on_mapblocks_changed, core.register_on_mapblocks_changed = make_registration()
+
+core.register_on_mods_loaded(function()
+	core.after(0, function()
+		setmetatable(core.registered_on_mapblocks_changed, {
+			__newindex = function()
+				error("on_mapblocks_changed callbacks must be registered at load time")
+			end,
+		})
+	end)
+end)
 
 --
 -- Compatibility for on_mapgen_init()