forked from VoxeLibre/VoxeLibre
289 lines
9.4 KiB
Lua
289 lines
9.4 KiB
Lua
--[[
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This mod implements a HACK to make 100% sure the digging times of all tools
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match Minecraft's perfectly. The digging times system of Minetest is very
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different, so this weird group trickery has to be used. In Minecraft, each
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block has a hardness and the actual Minecraft digging time is determined by
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this:
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1) The block's hardness
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2) The tool being used (the tool_multiplier and its efficiency level)
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3) Whether the tool is considered as "eligible" for the block
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(e.g. only diamond pick eligible for obsidian)
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See Minecraft Wiki <http://minecraft.gamepedia.com/Minecraft_Wiki> for more
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information.
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How the mod is used
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===================
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In MineClone 2, all diggable node have the hardness set in the custom field
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"_mcl_hardness" (0 by default). Digging groups are registered using the
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following code:
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mcl_autogroup.register_digtime_group("pickaxey", { levels = 5 })
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mcl_autogroup.register_digtime_group("shovely")
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mcl_autogroup.register_digtime_group("shovely")
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The first line registers "pickaxey" as a digging group. The "levels" field
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indicates that the digging group have 5 levels (in this case one for each
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material of a pickaxe). The second line registers "shovely" as a digging group
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which does not have separate levels (if the "levels" field is not set it
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defaults to 0).
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Nodes indicate that they belong to a particular digging group by being member of
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the digging group in their node definition. "mcl_core:dirt" for example has
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shovely=1 in its groups. If the digging group has multiple levels the value of
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the group indicates which digging level the node requires.
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"mcl_core:stone_with_gold" for example has pickaxey=3 because it requires a
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pickaxe of level 3 to be mined.
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For tools to be able to dig nodes of the digging groups they need to use the
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have the custom field "_mcl_autogroup_groupcaps" function to get the groupcaps.
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See "mcl_tools/init.lua" for examples of this.
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Information about the mod
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=========================
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The mod is split up into two parts, mcl_autogroup and _mcl_autogroup.
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mcl_autogroup contains the API functions used to register custom digging groups.
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_mcl_autogroup contains most of the code. The leading underscore in the name
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"_mcl_autogroup" is used to force Minetest to load that part of the mod as late
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as possible. Minetest loads mods in reverse alphabetical order.
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--]]
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-- The groups which affect dig times
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local basegroups = {}
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for group, _ in pairs(mcl_autogroup.registered_digtime_groups) do
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table.insert(basegroups, group)
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end
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-- Returns a table containing the unique "_mcl_hardness" for nodes belonging to
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-- each basegroup.
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local function get_hardness_values_for_groups()
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local maps = {}
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local values = {}
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for _, g in pairs(basegroups) do
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maps[g] = {}
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values[g] = {}
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end
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for _, ndef in pairs(minetest.registered_nodes) do
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for _, g in pairs(basegroups) do
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if ndef.groups[g] ~= nil then
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maps[g][ndef._mcl_hardness or 0] = true
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end
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end
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end
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for g, map in pairs(maps) do
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for k, _ in pairs(map) do
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table.insert(values[g], k)
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end
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end
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for _, g in pairs(basegroups) do
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table.sort(values[g])
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end
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return values
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end
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-- Returns a table containing a table indexed by "_mcl_hardness_value" to get
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-- its index in the list of unique hardnesses for each basegroup.
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local function get_hardness_lookup_for_groups(hardness_values)
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map = {}
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for g, values in pairs(hardness_values) do
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map[g] = {}
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for k, v in pairs(values) do
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map[g][v] = k
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end
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end
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return map
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end
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-- Array of unique hardness values for each group which affects dig time.
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local hardness_values = get_hardness_values_for_groups()
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-- Map indexed by hardness values which return the index of that value in
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-- hardness_value. Used for quick lookup.
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local hardness_lookup = get_hardness_lookup_for_groups(hardness_values)
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local function compute_creativetimes(group)
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local creativetimes = {}
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for index, hardness in pairs(hardness_values[group]) do
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table.insert(creativetimes, 0)
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end
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return creativetimes
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end
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-- Get the list of digging times for using a specific tool on a specific group.
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--
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-- Parameters:
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-- group - the group which it is digging
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-- can_harvest - if the tool can harvest the block
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-- tool_multiplier - dig speed multiplier for tool (default 1)
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-- efficiency - efficiency level for the tool (default 0)
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local function get_digtimes(group, can_harvest, tool_multiplier, efficiency)
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efficiency = efficiency or 0
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tool_multiplier = tool_multiplier or 1
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speed_multiplier = tool_multiplier
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if efficiency > 0 then
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speed_multiplier = speed_multiplier + efficiency * efficiency + 1
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end
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local digtimes = {}
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for index, hardness in pairs(hardness_values[group]) do
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local digtime = (hardness or 0) / speed_multiplier
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if can_harvest then
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digtime = digtime * 1.5
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else
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digtime = digtime * 5
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end
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if digtime <= 0.05 then
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digtime = 0
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else
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digtime = math.ceil(digtime * 20) / 20
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end
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table.insert(digtimes, digtime)
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end
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return digtimes
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end
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-- Get one groupcap field for using a specific tool on a specific group.
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local function get_groupcap(group, can_harvest, multiplier, efficiency, uses)
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return {
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times = get_digtimes(group, can_harvest, multiplier, efficiency),
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uses = uses,
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maxlevel = 0,
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}
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end
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-- Get the groupcaps for a tool on the specified digging groups. groupcaps_def
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-- contains a table with keys being the digging group and values being the tools
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-- properties for that digging group.
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--
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-- The tool properties can have the following values:
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--
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-- tool_multiplier - the digging speed multiplier for this tool (default 1)
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-- efficiency - the efficiency level for this tool (default 0)
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-- level - the maximum level of the group the tool can harvest (default 1)
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-- uses - the number of uses the tool has for this group
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--
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-- A level of 0 means that the tool will be able to dig that group but will
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-- never be able to harvest the nodes of that group and will always get a
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-- digging time penalty. This is useful for implementing the hand.
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--
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-- Example usage:
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--
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-- mcl_autogroup.get_groupcaps {
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-- pickaxey = { tool_multiplier = 4, level = 3, uses = 132 }
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-- }
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--
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-- This computes the groupcaps for a tool mining "pickaxey" blocks. The tool
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-- has a digging speed multiplier of 4, can mine nodes of level >= 3 and has 132
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-- uses.
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local function add_groupcaps(groupcaps, groupcaps_def)
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for g, capsdef in pairs(groupcaps_def) do
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local mult = capsdef.tool_multiplier or 1
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local eff = capsdef.efficiency or 0
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local def = mcl_autogroup.registered_digtime_groups[g]
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local level = capsdef.level or 1
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local max_level = def.levels or 0
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if max_level > 0 then
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level = math.min(level, max_level)
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groupcaps[g .. "_0_dig"] = get_groupcap(g, false, mult, eff)
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groupcaps[g .. "_" .. level .. "_dig"] = get_groupcap(g, true, mult, eff)
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else
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groupcaps[g .. "_dig"] = get_groupcap(g, true, mult, eff)
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end
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end
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return groupcaps
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end
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-- Checks if the given node would drop its useful drop if dug by a tool with the
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-- given tool capabilities. Returns true if it will yield its useful drop, false
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-- otherwise.
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function mcl_autogroup.can_harvest(nodename, tool_capabilities)
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local ndef = minetest.registered_nodes[nodename]
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local groupcaps = tool_capabilities.groupcaps
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local handy = minetest.get_item_group(nodename, "handy")
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local dig_immediate = minetest.get_item_group(nodename, "handy")
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if handy > 0 or dig_immediate >= 2 then
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return true
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end
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for g, _ in pairs(groupcaps) do
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if ndef.groups[g] then
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if not string.find(g, "_0_dig$") and string.find(g, "_dig$") then
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return true
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end
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end
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end
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return false
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end
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local overwrite = function()
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for nname, ndef in pairs(minetest.registered_nodes) do
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local newgroups = table.copy(ndef.groups)
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if (nname ~= "ignore" and ndef.diggable) then
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-- Automatically assign the "solid" group for solid nodes
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if (ndef.walkable == nil or ndef.walkable == true)
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and (ndef.collision_box == nil or ndef.collision_box.type == "regular")
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and (ndef.node_box == nil or ndef.node_box.type == "regular")
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and (ndef.groups.not_solid == 0 or ndef.groups.not_solid == nil) then
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newgroups.solid = 1
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end
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-- Automatically assign the "opaque" group for opaque nodes
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if (not (ndef.paramtype == "light" or ndef.sunlight_propagates)) and
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(ndef.groups.not_opaque == 0 or ndef.groups.not_opaque == nil) then
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newgroups.opaque = 1
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end
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-- Assign groups used for digging this node depending on
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-- the registered digging groups
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for g, gdef in pairs(mcl_autogroup.registered_digtime_groups) do
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local index = hardness_lookup[g][ndef._mcl_hardness]
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if ndef.groups[g] then
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if gdef.levels then
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newgroups[g .. "_0_dig"] = index
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for i = ndef.groups.pickaxey, gdef.levels do
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newgroups[g .. "_" .. i .. "_dig"] = index
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end
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else
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local index = hardness_lookup[g][ndef._mcl_hardness]
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newgroups[g .. "_dig"] = index
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end
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end
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end
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minetest.override_item(nname, {
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groups = newgroups
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})
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end
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end
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for tname, tdef in pairs(minetest.registered_tools) do
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-- Assign groupcaps for digging the registered digging groups
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-- depending on the _mcl_autogroup_groupcaps in the tool
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-- definition
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if tdef._mcl_autogroup_groupcaps then
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local toolcaps = table.copy(tdef.tool_capabilities) or {}
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local groupcaps = toolcaps.groupcaps or {}
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groupcaps = add_groupcaps(groupcaps, tdef._mcl_autogroup_groupcaps)
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toolcaps.groupcaps = groupcaps
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minetest.override_item(tname, {
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tool_capabilities = toolcaps
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})
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end
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end
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end
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overwrite()
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