336 lines
11 KiB
Lua
336 lines
11 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 nodes have the hardness set in the custom field
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"_mcl_hardness" (0 by default). These values are used together with digging
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groups by this mod to create the correct digging times for nodes. Digging
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groups are registered using the following code:
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mcl_autogroup.register_diggroup("shovely")
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mcl_autogroup.register_diggroup("pickaxey", {
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levels = { "wood", "gold", "stone", "iron", "diamond" }
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})
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The first line registers a simple digging group. The second line registers a
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digging group with 5 different levels (in this case one for each material of a
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pickaxes).
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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=4 because it requires a
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pickaxe of level 4 be mined.
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For tools to be able to dig nodes of digging groups they need to use the have
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the custom field "_mcl_diggroups" function to get the groupcaps. The value of
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this field is a table which defines which groups the tool can dig and how
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efficiently.
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_mcl_diggroups = {
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handy = { tool_multiplier = 1, level = 1, uses = 0 },
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pickaxey = { tool_multiplier = 1, level = 0, uses = 0 },
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}
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The "uses" field indicate how many uses (0 for infinite) a tool has when used on
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the specified digging group. The "tool_multiplier" field is a multiplier to the
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dig speed on that digging group.
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The "level" field indicates which levels of the group the tool can harvest. A
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level of 0 means that the tool cannot harvest blocks of that node. A level of 1
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or above means that the tool can harvest nodes with that level or below. See
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"mcl_tools/init.lua" for examples on how "_mcl_diggroups" is used in practice.
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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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This also means that it is very important that no mod adds _mcl_autogroup as a
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dependency.
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--]]
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-- Returns a table containing the unique "_mcl_hardness" for nodes belonging to
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-- each diggroup.
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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(mcl_autogroup.registered_diggroups) 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(mcl_autogroup.registered_diggroups) 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(mcl_autogroup.registered_diggroups) 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 diggroup.
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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
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-- diggroup.
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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 if applicable
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local function get_digtimes(group, can_harvest, tool_multiplier, efficiency)
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tool_multiplier = tool_multiplier or 1
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speed_multiplier = tool_multiplier
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if efficiency 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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-- Add the groupcaps from a field in "_mcl_diggroups" to the groupcaps of a
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-- tool.
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local function add_groupcaps(toolname, groupcaps, groupcaps_def, efficiency)
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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 uses = capsdef.uses
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local def = mcl_autogroup.registered_diggroups[g]
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local max_level = def.levels and #def.levels or 1
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assert(capsdef.level, toolname .. ' is missing level for ' .. g)
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local level = math.min(capsdef.level, max_level)
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if def.levels then
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groupcaps[g .. "_dig_default"] = get_groupcap(g, false, mult, efficiency, uses)
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if level > 0 then
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groupcaps[g .. "_dig_" .. def.levels[level]] = get_groupcap(g, true, mult, efficiency, uses)
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end
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else
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groupcaps[g .. "_dig"] = get_groupcap(g, level > 0, mult, efficiency, uses)
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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 given tool.
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-- Returns true if it will yield its useful drop, false otherwise.
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function mcl_autogroup.can_harvest(nodename, toolname)
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local ndef = minetest.registered_nodes[nodename]
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if minetest.get_item_group(nodename, "dig_immediate") >= 2 then
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return true
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end
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-- Check if it can be dug by tool
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local tdef = minetest.registered_tools[toolname]
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if tdef then
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for g, gdef in pairs(tdef._mcl_diggroups) do
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if ndef.groups[g] then
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if ndef.groups[g] <= gdef.level 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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end
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-- Check if it can be dug by hand
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local tdef = minetest.registered_tools[""]
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if tdef then
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for g, gdef in pairs(tdef._mcl_diggroups) do
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if ndef.groups[g] then
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if ndef.groups[g] <= gdef.level 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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end
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return false
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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. This function returns "groupcaps" table of
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-- digging which should be put in the "tool_capabilities" of the tool definition
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-- or in the metadata of an enchanted tool.
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--
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-- Parameters:
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-- toolname - Name of the tool being enchanted (like "mcl_tools:diamond_pickaxe")
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-- efficiency - The efficiency level the tool is enchanted with (default 0)
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--
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-- NOTE:
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-- This function can only be called after mod initialization. Otherwise a mod
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-- would have to add _mcl_autogroup as a dependency which would break the mod
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-- loading order.
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function mcl_autogroup.get_groupcaps(toolname, efficiency)
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local tdef = minetest.registered_tools[toolname]
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local groupcaps = table.copy(tdef.tool_capabilities.groupcaps or {})
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add_groupcaps(toolname, groupcaps, tdef._mcl_diggroups, efficiency)
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return groupcaps
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end
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-- Get the wear from using a tool on a digging group.
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--
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-- Parameters
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-- toolname - Name of the tool used
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-- diggroup - The name of the diggroup the tool is used on
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--
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-- NOTE:
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-- This function can only be called after mod initialization. Otherwise a mod
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-- would have to add _mcl_autogroup as a dependency which would break the mod
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-- loading order.
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function mcl_autogroup.get_wear(toolname, diggroup)
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local tdef = minetest.registered_tools[toolname]
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local uses = tdef._mcl_diggroups[diggroup].uses
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return math.ceil(65535 / uses)
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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_diggroups) do
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local index = hardness_lookup[g][ndef._mcl_hardness or 0]
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if ndef.groups[g] then
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if gdef.levels then
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newgroups[g .. "_dig_default"] = index
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for i = ndef.groups[g], #gdef.levels do
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newgroups[g .. "_dig_" .. gdef.levels[i]] = index
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end
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else
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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_diggroups in the tool definition
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if tdef._mcl_diggroups then
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local toolcaps = table.copy(tdef.tool_capabilities) or {}
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toolcaps.groupcaps = mcl_autogroup.get_groupcaps(tname)
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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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