forked from VoxeLibre/VoxeLibre
55 lines
2.0 KiB
Lua
55 lines
2.0 KiB
Lua
local efficiency_cache_table = {}
|
|
|
|
-- Compute a hash value.
|
|
function compute_hash(value)
|
|
-- minetest.get_password_hash is quite fast, even if it uses a
|
|
-- cryptographic hashing function (SHA-1). It is written in C++ and it
|
|
-- is probably hard to write a faster hashing function in Lua.
|
|
return string.sub(minetest.get_password_hash("ryvnf", minetest.serialize(value)), 1, 8)
|
|
end
|
|
|
|
-- Get the efficiency groupcaps and hash for a tool and efficiency level. If
|
|
-- this function is called repeatedly with the same values it will return data
|
|
-- from a cache.
|
|
--
|
|
-- Returns a table with the following two fields:
|
|
-- values - the groupcaps table
|
|
-- hash - the hash of the groupcaps table
|
|
local function get_efficiency_groupcaps(toolname, level)
|
|
local toolcache = efficiency_cache_table[toolname]
|
|
if not toolcache then
|
|
toolcache = {}
|
|
efficiency_cache_table[toolname] = toolcache
|
|
end
|
|
|
|
local levelcache = toolcache[level]
|
|
if not levelcache then
|
|
levelcache = {}
|
|
levelcache.values = mcl_autogroup.get_groupcaps(toolname, level)
|
|
levelcache.hash = compute_hash(levelcache.values)
|
|
toolcache[level] = levelcache
|
|
end
|
|
|
|
return levelcache
|
|
end
|
|
|
|
-- Apply efficiency enchantment to a tool. This will update the tools
|
|
-- tool_capabilities to give it new digging times. This function will be called
|
|
-- repeatedly to make sure the digging times stored in groupcaps stays in sync
|
|
-- when the digging times of nodes can change.
|
|
--
|
|
-- To make it more efficient it will first check a hash value to determine if
|
|
-- the tool needs to be updated.
|
|
function mcl_enchanting.apply_efficiency(itemstack, level)
|
|
local name = itemstack:get_name()
|
|
local groupcaps = get_efficiency_groupcaps(name, level)
|
|
local hash = itemstack:get_meta():get_string("groupcaps_hash")
|
|
|
|
if not hash or hash ~= groupcaps.hash then
|
|
local tool_capabilities = itemstack:get_tool_capabilities()
|
|
tool_capabilities.groupcaps = groupcaps.values
|
|
itemstack:get_meta():set_tool_capabilities(tool_capabilities)
|
|
itemstack:get_meta():set_string("groupcaps_hash", groupcaps.hash)
|
|
end
|
|
end
|