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