forked from VoxeLibre/VoxeLibre
64 lines
2.1 KiB
Lua
64 lines
2.1 KiB
Lua
local groupcaps_cache = {}
|
|
|
|
-- 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 groupcaps and hash for an enchanted tool. If this function is called
|
|
-- repeatedly with the same values it will return data from a cache.
|
|
--
|
|
-- Parameters:
|
|
-- toolname - Name of the tool
|
|
-- level - The efficiency level of the tool
|
|
--
|
|
-- 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 = groupcaps_cache[toolname]
|
|
local level = level
|
|
|
|
if not toolcache then
|
|
toolcache = {}
|
|
groupcaps_cache[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
|
|
|
|
-- Update groupcaps of an enchanted tool. 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.update_groupcaps(itemstack)
|
|
if not itemstack:get_tool_capabilities() then
|
|
return
|
|
end
|
|
|
|
local name = itemstack:get_name()
|
|
local level = mcl_enchanting.get_enchantment(itemstack, "efficiency")
|
|
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
|