629 lines
14 KiB
Lua
629 lines
14 KiB
Lua
-- Minetest: builtin/item_entity.lua
|
|
|
|
-- override ice to make slippery for 0.4.16
|
|
if not minetest.raycast then
|
|
minetest.override_item("default:ice", {
|
|
groups = {cracky = 3, puts_out_fire = 1, cools_lava = 1, slippery = 3}})
|
|
end
|
|
|
|
|
|
function core.spawn_item(pos, item)
|
|
|
|
local stack = ItemStack(item)
|
|
local obj = core.add_entity(pos, "__builtin:item")
|
|
|
|
if obj then
|
|
obj:get_luaentity():set_item(stack:to_string())
|
|
end
|
|
|
|
return obj
|
|
end
|
|
|
|
|
|
-- If item_entity_ttl is not set, enity will have default life time
|
|
-- Setting it to -1 disables the feature
|
|
local time_to_live = tonumber(core.settings:get("item_entity_ttl")) or 900
|
|
local gravity = tonumber(core.settings:get("movement_gravity")) or 9.81
|
|
local destroy_item = core.settings:get_bool("destroy_item") ~= false
|
|
|
|
|
|
-- localize some math functions
|
|
local abs = math.abs
|
|
local sqrt = math.sqrt
|
|
|
|
|
|
-- water flow functions by QwertyMine3, edited by TenPlus1 and Gustavo6046
|
|
local inv_roots = {[0] = 1}
|
|
|
|
local function to_unit_vector(dir_vector)
|
|
|
|
local sum = dir_vector.x * dir_vector.x + dir_vector.z * dir_vector.z
|
|
local invr_sum
|
|
|
|
-- find inverse square root if possible
|
|
if inv_roots[sum] ~= nil then
|
|
invr_sum = inv_roots[sum]
|
|
else
|
|
-- not found, compute and save the inverse square root
|
|
invr_sum = 1.0 / sqrt(sum)
|
|
inv_roots[sum] = invr_sum
|
|
end
|
|
|
|
return {
|
|
x = dir_vector.x * invr_sum,
|
|
y = dir_vector.y,
|
|
z = dir_vector.z * invr_sum
|
|
}
|
|
end
|
|
|
|
|
|
local function node_ok(pos)
|
|
|
|
local node = minetest.get_node_or_nil(pos)
|
|
|
|
if node and minetest.registered_nodes[node.name] then
|
|
return node
|
|
end
|
|
|
|
return minetest.registered_nodes["default:dirt"]
|
|
end
|
|
|
|
|
|
local function quick_flow_logic(node, pos_testing, direction)
|
|
|
|
local node_testing = node_ok(pos_testing)
|
|
local param2 = node.param2
|
|
|
|
if not minetest.registered_nodes[node.name].groups.liquid then
|
|
param2 = 0
|
|
end
|
|
|
|
if minetest.registered_nodes[node_testing.name].liquidtype ~= "flowing"
|
|
and minetest.registered_nodes[node_testing.name].liquidtype ~= "source" then
|
|
return 0
|
|
end
|
|
|
|
local param2_testing = node_testing.param2
|
|
|
|
if param2_testing < param2 then
|
|
|
|
if (param2 - param2_testing) > 6 then
|
|
return -direction
|
|
else
|
|
return direction
|
|
end
|
|
|
|
elseif param2_testing > param2 then
|
|
|
|
if (param2_testing - param2) > 6 then
|
|
return direction
|
|
else
|
|
return -direction
|
|
end
|
|
end
|
|
|
|
return 0
|
|
end
|
|
|
|
|
|
local function quick_flow(pos, node)
|
|
|
|
local x, z = 0.0, 0.0
|
|
|
|
x = x + quick_flow_logic(node, {x = pos.x - 1, y = pos.y, z = pos.z},-1)
|
|
x = x + quick_flow_logic(node, {x = pos.x + 1, y = pos.y, z = pos.z}, 1)
|
|
z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z - 1},-1)
|
|
z = z + quick_flow_logic(node, {x = pos.x, y = pos.y, z = pos.z + 1}, 1)
|
|
|
|
return to_unit_vector({x = x, y = 0, z = z})
|
|
end
|
|
|
|
|
|
-- particle effects for when item is destroyed
|
|
local function add_effects(pos)
|
|
|
|
minetest.add_particlespawner({
|
|
amount = 1,
|
|
time = 0.25,
|
|
minpos = pos,
|
|
maxpos = pos,
|
|
minvel = {x = -1, y = 2, z = -1},
|
|
maxvel = {x = 1, y = 4, z = 1},
|
|
minacc = {x = 0, y = 0, z = 0},
|
|
maxacc = {x = 0, y = 0, z = 0},
|
|
minexptime = 1,
|
|
maxexptime = 3,
|
|
minsize = 1,
|
|
maxsize = 4,
|
|
texture = "tnt_smoke.png",
|
|
})
|
|
end
|
|
|
|
-- print vector, helpful when debugging
|
|
local function vec_print(head, vec)
|
|
print(head, vec.x, vec.y, vec.z)
|
|
end
|
|
|
|
|
|
local water_force = tonumber(minetest.settings:get("builtin_item.waterflow_force") or 1.6)
|
|
local water_drag = tonumber(minetest.settings:get("builtin_item.waterflow_drag") or 0.8)
|
|
local dry_friction = tonumber(minetest.settings:get("builtin_item.friction_dry") or 2.5)
|
|
local air_drag = tonumber(minetest.settings:get("builtin_item.air_drag") or 0.4)
|
|
local items_collect_on_slippery = tonumber(
|
|
minetest.settings:get("builtin_item.items_collect_on_slippery") or 1) ~= 0
|
|
|
|
|
|
core.register_entity(":__builtin:item", {
|
|
|
|
initial_properties = {
|
|
hp_max = 1,
|
|
physical = true,
|
|
collide_with_objects = false,
|
|
collisionbox = {-0.3, -0.3, -0.3, 0.3, 0.3, 0.3},
|
|
visual = "wielditem",
|
|
visual_size = {x = 0.4, y = 0.4},
|
|
textures = {""},
|
|
spritediv = {x = 1, y = 1},
|
|
initial_sprite_basepos = {x = 0, y = 0},
|
|
is_visible = false,
|
|
infotext = ""
|
|
},
|
|
|
|
itemstring = "",
|
|
falling_state = true,
|
|
slippery_state = false,
|
|
waterflow_state = false,
|
|
age = 0,
|
|
|
|
accel = {x = 0, y = 0, z = 0},
|
|
|
|
set_item = function(self, item)
|
|
|
|
local stack = ItemStack(item or self.itemstring)
|
|
|
|
self.itemstring = stack:to_string()
|
|
|
|
if self.itemstring == "" then
|
|
return
|
|
end
|
|
|
|
local itemname = stack:is_known() and stack:get_name() or "unknown"
|
|
local max_count = stack:get_stack_max()
|
|
local count = math.min(stack:get_count(), max_count)
|
|
local size = 0.2 + 0.1 * (count / max_count) ^ (1 / 3)
|
|
local col_height = size * 0.75
|
|
local def = core.registered_nodes[itemname]
|
|
local glow = def and def.light_source
|
|
local c1, c2 = "",""
|
|
|
|
if not(stack:get_count() == 1) then
|
|
c1 = " x" .. tostring(stack:get_count())
|
|
c2 = " " .. tostring(stack:get_count())
|
|
end
|
|
|
|
local name1 = stack:get_meta():get_string("description")
|
|
local name
|
|
|
|
if name1 == "" then
|
|
name = core.registered_items[itemname].description
|
|
else
|
|
name = name1
|
|
end
|
|
|
|
-- small random size bias to counter Z-fighting
|
|
local bias = math.random() * 1e-3
|
|
|
|
self.object:set_properties({
|
|
is_visible = true,
|
|
visual = "wielditem",
|
|
textures = {itemname},
|
|
visual_size = {x = size + bias, y = size + bias, z = size + bias},
|
|
collisionbox = {-size, -col_height, -size, size, col_height, size},
|
|
selectionbox = {-size, -size, -size, size, size, size},
|
|
automatic_rotate = 0.314 / size,
|
|
wield_item = self.itemstring,
|
|
glow = glow,
|
|
infotext = name .. c1 .. "\n(" .. itemname .. c2 .. ")"
|
|
})
|
|
|
|
end,
|
|
|
|
get_staticdata = function(self)
|
|
|
|
local data = {
|
|
itemstring = self.itemstring,
|
|
age = self.age,
|
|
dropped_by = self.dropped_by
|
|
}
|
|
|
|
return core.serialize(data)
|
|
end,
|
|
|
|
on_activate = function(self, staticdata, dtime_s)
|
|
|
|
if string.sub(staticdata, 1, string.len("return")) == "return" then
|
|
|
|
local data = core.deserialize(staticdata)
|
|
|
|
if data and type(data) == "table" then
|
|
self.itemstring = data.itemstring
|
|
self.age = (data.age or 0) + dtime_s
|
|
self.dropped_by = data.dropped_by
|
|
end
|
|
else
|
|
self.itemstring = staticdata
|
|
end
|
|
|
|
self.object:set_armor_groups({immortal = 1})
|
|
self:set_item()
|
|
end,
|
|
|
|
try_merge_with = function(self, own_stack, object, entity)
|
|
|
|
if self.age == entity.age then
|
|
return false -- Can not merge with itself
|
|
end
|
|
|
|
local stack = ItemStack(entity.itemstring)
|
|
local name = stack:get_name()
|
|
|
|
if own_stack:get_name() ~= name
|
|
or own_stack:get_meta() ~= stack:get_meta()
|
|
or own_stack:get_wear() ~= stack:get_wear()
|
|
or own_stack:get_free_space() == 0 then
|
|
return false -- Can not merge different or full stack
|
|
end
|
|
|
|
local count = own_stack:get_count()
|
|
local total_count = stack:get_count() + count
|
|
local max_count = stack:get_stack_max()
|
|
|
|
if total_count > max_count then
|
|
return false
|
|
end
|
|
|
|
-- Merge the remote stack into this one
|
|
local pos = object:get_pos()
|
|
|
|
pos.y = pos.y + ((total_count - count) / max_count) * 0.15
|
|
|
|
self.object:move_to(pos)
|
|
self.age = 0 -- Handle as new entity
|
|
|
|
-- Merge velocities
|
|
local vel_a = self.object:get_velocity()
|
|
local vel_b = object:get_velocity()
|
|
|
|
self.object:set_velocity({
|
|
x = (vel_a.x + vel_b.x) / 2,
|
|
y = (vel_a.y + vel_b.y) / 2,
|
|
z = (vel_a.z + vel_b.z) / 2
|
|
})
|
|
|
|
-- Merge stacks
|
|
own_stack:set_count(total_count)
|
|
self:set_item(own_stack)
|
|
|
|
entity.itemstring = ""
|
|
object:remove()
|
|
|
|
return true
|
|
end,
|
|
|
|
step_update_node_state = function(self, moveresult, dtime)
|
|
|
|
local pos = self.object:get_pos()
|
|
|
|
-- get nodes every 1/4 second
|
|
self.timer = (self.timer or 0) + dtime
|
|
|
|
if self.timer > 0.25 or not self.node_inside then
|
|
|
|
self.node_inside = minetest.get_node_or_nil(pos)
|
|
self.def_inside = self.node_inside
|
|
and core.registered_nodes[self.node_inside.name]
|
|
|
|
-- get ground node for collision
|
|
self.node_under = nil
|
|
self.falling_state = true
|
|
|
|
if moveresult.touching_ground then
|
|
|
|
for _, info in ipairs(moveresult.collisions) do
|
|
|
|
if info.axis == "y" then
|
|
|
|
self.node_under = core.get_node(info.node_pos)
|
|
self.falling_state = false
|
|
|
|
break
|
|
end
|
|
end
|
|
end
|
|
|
|
self.def_under = self.node_under
|
|
and core.registered_nodes[self.node_under.name]
|
|
|
|
self.timer = 0
|
|
end
|
|
end,
|
|
|
|
step_node_inside_checks = function(self)
|
|
|
|
local pos = self.object:get_pos()
|
|
local node = self.node_inside
|
|
local def = self.def_inside
|
|
|
|
-- Delete in 'ignore' nodes
|
|
if node and node.name == "ignore" then
|
|
|
|
self.itemstring = ""
|
|
self.object:remove()
|
|
|
|
return true
|
|
end
|
|
|
|
-- item inside block, move to vacant space
|
|
if def and (def.walkable == nil or def.walkable == true)
|
|
and (def.collision_box == nil or def.collision_box.type == "regular")
|
|
and (def.node_box == nil or def.node_box.type == "regular") then
|
|
|
|
local npos = minetest.find_node_near(pos, 1, "air")
|
|
|
|
if npos then
|
|
self.object:move_to(npos)
|
|
end
|
|
|
|
self.node_inside = nil -- force get_node
|
|
end
|
|
|
|
-- destroy item when dropped into lava (if enabled)
|
|
if destroy_item and def and def.groups and def.groups.lava then
|
|
|
|
minetest.sound_play("builtin_item_lava", {
|
|
pos = pos,
|
|
max_hear_distance = 6,
|
|
gain = 0.5
|
|
})
|
|
|
|
self.itemstring = ""
|
|
self.object:remove()
|
|
|
|
add_effects(pos)
|
|
|
|
return true
|
|
end
|
|
|
|
return false
|
|
end,
|
|
|
|
step_check_slippery = function(self)
|
|
|
|
-- don't check for slippery ground if we're not on
|
|
-- any ground to begin with
|
|
local node = self.node_under
|
|
local def = self.def_under
|
|
|
|
if self.falling_state or not node then
|
|
self.slippery_state = false
|
|
return
|
|
end
|
|
|
|
if node and def and def.walkable then
|
|
|
|
local slippery = core.get_item_group(node.name, "slippery")
|
|
|
|
self.slippery_state = slippery ~= 0
|
|
end
|
|
end,
|
|
|
|
step_water_physics = function(self)
|
|
|
|
local pos = self.object:get_pos()
|
|
local vel = self.object:get_velocity()
|
|
local node = self.node_inside
|
|
local def = self.def_inside
|
|
|
|
self.waterflow_state = def and def.liquidtype == "flowing"
|
|
|
|
if self.waterflow_state then
|
|
|
|
-- get flow velocity
|
|
local flow_vel = quick_flow(pos, node)
|
|
|
|
-- calculate flow force and drag
|
|
local flow_force_x = flow_vel.x * water_force
|
|
local flow_force_z = flow_vel.z * water_force
|
|
|
|
local flow_drag_x = (flow_force_x - vel.x) * water_drag
|
|
local flow_drag_z = (flow_force_z - vel.z) * water_drag
|
|
|
|
-- apply water force and friction
|
|
self.accel.x = self.accel.x + flow_force_x + flow_drag_x
|
|
self.accel.z = self.accel.z + flow_force_z + flow_drag_z
|
|
end
|
|
end,
|
|
|
|
step_air_drag_physics = function(self)
|
|
|
|
local vel = self.object:get_velocity()
|
|
|
|
-- apply air drag
|
|
if self.falling_state or (self.slippery_state and not self.waterflow_state) then
|
|
self.accel.x = self.accel.x - vel.x * air_drag
|
|
self.accel.z = self.accel.z - vel.z * air_drag
|
|
end
|
|
end,
|
|
|
|
step_gravity = function(self)
|
|
|
|
if self.falling_state then
|
|
self.accel.y = self.accel.y - gravity
|
|
end
|
|
end,
|
|
|
|
step_ground_friction = function(self)
|
|
|
|
-- don't apply ground friction when falling!
|
|
if self.falling_state then
|
|
return
|
|
end
|
|
|
|
local vel = self.object:get_velocity()
|
|
|
|
if self.slippery_state then
|
|
|
|
local node = self.node_under
|
|
|
|
-- apply slip factor (tiny friction that depends on the actual block type)
|
|
if (abs(vel.x) > 0.2 or abs(vel.z) > 0.2) then
|
|
|
|
local slippery = core.get_item_group(node.name, "slippery")
|
|
local slip_factor = 4.0 / (slippery + 4)
|
|
|
|
self.accel.x = self.accel.x - vel.x * slip_factor
|
|
self.accel.z = self.accel.z - vel.z * slip_factor
|
|
end
|
|
|
|
else
|
|
self.accel.x = self.accel.x - vel.x * dry_friction
|
|
self.accel.z = self.accel.z - vel.z * dry_friction
|
|
end
|
|
end,
|
|
|
|
step_apply_forces = function(self)
|
|
self.object:set_acceleration(self.accel)
|
|
end,
|
|
|
|
step_check_timeout = function(self, dtime)
|
|
|
|
local pos = self.object:get_pos()
|
|
|
|
self.age = self.age + dtime
|
|
|
|
if time_to_live > 0 and self.age > time_to_live then
|
|
|
|
self.itemstring = ""
|
|
self.object:remove()
|
|
|
|
add_effects(pos)
|
|
|
|
return true
|
|
end
|
|
|
|
return false
|
|
end,
|
|
|
|
step_check_custom_step = function(self, dtime, moveresult)
|
|
|
|
local pos = self.object:get_pos()
|
|
|
|
-- do custom step function
|
|
local name = ItemStack(self.itemstring):get_name() or ""
|
|
local custom = core.registered_items[name]
|
|
and core.registered_items[name].dropped_step
|
|
|
|
if custom and custom(self, pos, dtime, moveresult) == false then
|
|
return true -- skip further checks if false
|
|
end
|
|
|
|
return false
|
|
end,
|
|
|
|
step_try_collect = function(self)
|
|
|
|
local self_pos = self.object:get_pos()
|
|
|
|
-- Don't collect items if falling
|
|
if self.falling_state then
|
|
return
|
|
end
|
|
|
|
-- Check if we should collect items while sliding
|
|
if self.slippery_state and not items_collect_on_slippery then
|
|
return
|
|
end
|
|
|
|
-- Collect the items around to merge with
|
|
local own_stack = ItemStack(self.itemstring)
|
|
|
|
if own_stack:get_free_space() == 0 then
|
|
return
|
|
end
|
|
|
|
local objects = core.get_objects_inside_radius(self_pos, 1.0)
|
|
|
|
for _, obj in pairs(objects) do
|
|
|
|
local entity = obj:get_luaentity()
|
|
|
|
if entity and entity.name == "__builtin:item" and not entity.is_falling then
|
|
|
|
if self:try_merge_with(own_stack, obj, entity) then
|
|
|
|
-- item will be moved up due to try_merge_with
|
|
self.falling_state = true
|
|
|
|
own_stack = ItemStack(self.itemstring)
|
|
|
|
if own_stack:get_free_space() == 0 then
|
|
return
|
|
end
|
|
end
|
|
end
|
|
end
|
|
end,
|
|
|
|
on_step = function(self, dtime, moveresult)
|
|
|
|
-- reset acceleration
|
|
self.accel = {x = 0, y = 0, z = 0}
|
|
|
|
-- check item timeout
|
|
if self:step_check_timeout(dtime) then
|
|
return -- deleted, stop here
|
|
end
|
|
|
|
-- check custom step function
|
|
if self:step_check_custom_step(dtime, moveresult) then
|
|
return -- overriden
|
|
end
|
|
|
|
-- do general checks
|
|
self:step_update_node_state(moveresult, dtime)
|
|
|
|
if self:step_node_inside_checks() then
|
|
return -- destroyed
|
|
end
|
|
|
|
self:step_check_slippery()
|
|
|
|
-- do physics checks, then apply
|
|
self:step_water_physics()
|
|
self:step_ground_friction()
|
|
self:step_gravity()
|
|
|
|
self:step_apply_forces()
|
|
|
|
-- do item checks
|
|
self:step_try_collect()
|
|
end,
|
|
|
|
on_punch = function(self, hitter)
|
|
|
|
local inv = hitter:get_inventory()
|
|
|
|
if inv and self.itemstring ~= "" then
|
|
|
|
local left = inv:add_item("main", self.itemstring)
|
|
|
|
if left and not left:is_empty() then
|
|
self:set_item(left)
|
|
return
|
|
end
|
|
end
|
|
|
|
self.itemstring = ""
|
|
self.object:remove()
|
|
end,
|
|
})
|