minetest_game/mods/tnt/init.lua
Foz 20bd4560f8 TNT: Track TNT owner in metadata for protection mods
It is useful for protection mods to know who owns an exploding
TNT block. This allows the blocks destroyed by the TNT to be
limited to the same ones the owner could destroy without using
TNT.

TNT placed within a protected area by the area owner, and later
ignited by another player will destroy within the protected area
nodes the igniter may not otherwise be able to interact with. Any
player could significantly increase the size of an explosion by
placing more TNT in an adjacent unprotected area if the original
TNT block was placed withing 1 node of such a boundary. This
feature sounds dangerous, but we are talking about TNT. Players
should use it carefully.
2017-11-19 22:53:53 +01:00

660 lines
17 KiB
Lua

tnt = {}
-- Default to enabled when in singleplayer
local enable_tnt = minetest.settings:get_bool("enable_tnt")
if enable_tnt == nil then
enable_tnt = minetest.is_singleplayer()
end
-- loss probabilities array (one in X will be lost)
local loss_prob = {}
loss_prob["default:cobble"] = 3
loss_prob["default:dirt"] = 4
local tnt_radius = tonumber(minetest.settings:get("tnt_radius") or 3)
-- Fill a list with data for content IDs, after all nodes are registered
local cid_data = {}
minetest.after(0, function()
for name, def in pairs(minetest.registered_nodes) do
cid_data[minetest.get_content_id(name)] = {
name = name,
drops = def.drops,
flammable = def.groups.flammable,
on_blast = def.on_blast,
}
end
end)
local function rand_pos(center, pos, radius)
local def
local reg_nodes = minetest.registered_nodes
local i = 0
repeat
-- Give up and use the center if this takes too long
if i > 4 then
pos.x, pos.z = center.x, center.z
break
end
pos.x = center.x + math.random(-radius, radius)
pos.z = center.z + math.random(-radius, radius)
def = reg_nodes[minetest.get_node(pos).name]
i = i + 1
until def and not def.walkable
end
local function eject_drops(drops, pos, radius)
local drop_pos = vector.new(pos)
for _, item in pairs(drops) do
local count = math.min(item:get_count(), item:get_stack_max())
while count > 0 do
local take = math.max(1,math.min(radius * radius,
count,
item:get_stack_max()))
rand_pos(pos, drop_pos, radius)
local dropitem = ItemStack(item)
dropitem:set_count(take)
local obj = minetest.add_item(drop_pos, dropitem)
if obj then
obj:get_luaentity().collect = true
obj:setacceleration({x = 0, y = -10, z = 0})
obj:setvelocity({x = math.random(-3, 3),
y = math.random(0, 10),
z = math.random(-3, 3)})
end
count = count - take
end
end
end
local function add_drop(drops, item)
item = ItemStack(item)
local name = item:get_name()
if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
return
end
local drop = drops[name]
if drop == nil then
drops[name] = item
else
drop:set_count(drop:get_count() + item:get_count())
end
end
local basic_flame_on_construct -- cached value
local function destroy(drops, npos, cid, c_air, c_fire,
on_blast_queue, on_construct_queue,
ignore_protection, ignore_on_blast, owner)
if not ignore_protection and minetest.is_protected(npos, owner) then
return cid
end
local def = cid_data[cid]
if not def then
return c_air
elseif not ignore_on_blast and def.on_blast then
on_blast_queue[#on_blast_queue + 1] = {
pos = vector.new(npos),
on_blast = def.on_blast
}
return cid
elseif def.flammable then
on_construct_queue[#on_construct_queue + 1] = {
fn = basic_flame_on_construct,
pos = vector.new(npos)
}
return c_fire
else
local node_drops = minetest.get_node_drops(def.name, "")
for _, item in pairs(node_drops) do
add_drop(drops, item)
end
return c_air
end
end
local function calc_velocity(pos1, pos2, old_vel, power)
-- Avoid errors caused by a vector of zero length
if vector.equals(pos1, pos2) then
return old_vel
end
local vel = vector.direction(pos1, pos2)
vel = vector.normalize(vel)
vel = vector.multiply(vel, power)
-- Divide by distance
local dist = vector.distance(pos1, pos2)
dist = math.max(dist, 1)
vel = vector.divide(vel, dist)
-- Add old velocity
vel = vector.add(vel, old_vel)
-- randomize it a bit
vel = vector.add(vel, {
x = math.random() - 0.5,
y = math.random() - 0.5,
z = math.random() - 0.5,
})
-- Limit to terminal velocity
dist = vector.length(vel)
if dist > 250 then
vel = vector.divide(vel, dist / 250)
end
return vel
end
local function entity_physics(pos, radius, drops)
local objs = minetest.get_objects_inside_radius(pos, radius)
for _, obj in pairs(objs) do
local obj_pos = obj:getpos()
local dist = math.max(1, vector.distance(pos, obj_pos))
local damage = (4 / dist) * radius
if obj:is_player() then
-- currently the engine has no method to set
-- player velocity. See #2960
-- instead, we knock the player back 1.0 node, and slightly upwards
local dir = vector.normalize(vector.subtract(obj_pos, pos))
local moveoff = vector.multiply(dir, dist + 1.0)
local newpos = vector.add(pos, moveoff)
newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
obj:setpos(newpos)
obj:set_hp(obj:get_hp() - damage)
else
local do_damage = true
local do_knockback = true
local entity_drops = {}
local luaobj = obj:get_luaentity()
local objdef = minetest.registered_entities[luaobj.name]
if objdef and objdef.on_blast then
do_damage, do_knockback, entity_drops = objdef.on_blast(luaobj, damage)
end
if do_knockback then
local obj_vel = obj:getvelocity()
obj:setvelocity(calc_velocity(pos, obj_pos,
obj_vel, radius * 10))
end
if do_damage then
if not obj:get_armor_groups().immortal then
obj:punch(obj, 1.0, {
full_punch_interval = 1.0,
damage_groups = {fleshy = damage},
}, nil)
end
end
for _, item in pairs(entity_drops) do
add_drop(drops, item)
end
end
end
end
local function add_effects(pos, radius, drops)
minetest.add_particle({
pos = pos,
velocity = vector.new(),
acceleration = vector.new(),
expirationtime = 0.4,
size = radius * 10,
collisiondetection = false,
vertical = false,
texture = "tnt_boom.png",
})
minetest.add_particlespawner({
amount = 64,
time = 0.5,
minpos = vector.subtract(pos, radius / 2),
maxpos = vector.add(pos, radius / 2),
minvel = {x = -10, y = -10, z = -10},
maxvel = {x = 10, y = 10, z = 10},
minacc = vector.new(),
maxacc = vector.new(),
minexptime = 1,
maxexptime = 2.5,
minsize = radius * 3,
maxsize = radius * 5,
texture = "tnt_smoke.png",
})
-- we just dropped some items. Look at the items entities and pick
-- one of them to use as texture
local texture = "tnt_blast.png" --fallback texture
local most = 0
for name, stack in pairs(drops) do
local count = stack:get_count()
if count > most then
most = count
local def = minetest.registered_nodes[name]
if def and def.tiles and def.tiles[1] then
texture = def.tiles[1]
end
end
end
minetest.add_particlespawner({
amount = 64,
time = 0.1,
minpos = vector.subtract(pos, radius / 2),
maxpos = vector.add(pos, radius / 2),
minvel = {x = -3, y = 0, z = -3},
maxvel = {x = 3, y = 5, z = 3},
minacc = {x = 0, y = -10, z = 0},
maxacc = {x = 0, y = -10, z = 0},
minexptime = 0.8,
maxexptime = 2.0,
minsize = radius * 0.66,
maxsize = radius * 2,
texture = texture,
collisiondetection = true,
})
end
function tnt.burn(pos, nodename)
local name = nodename or minetest.get_node(pos).name
local def = minetest.registered_nodes[name]
if not def then
return
elseif def.on_ignite then
def.on_ignite(pos)
elseif minetest.get_item_group(name, "tnt") > 0 then
minetest.swap_node(pos, {name = name .. "_burning"})
minetest.sound_play("tnt_ignite", {pos = pos})
minetest.get_node_timer(pos):start(1)
end
end
local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast, owner)
pos = vector.round(pos)
-- scan for adjacent TNT nodes first, and enlarge the explosion
local vm1 = VoxelManip()
local p1 = vector.subtract(pos, 2)
local p2 = vector.add(pos, 2)
local minp, maxp = vm1:read_from_map(p1, p2)
local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
local data = vm1:get_data()
local count = 0
local c_tnt = minetest.get_content_id("tnt:tnt")
local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
local c_tnt_boom = minetest.get_content_id("tnt:boom")
local c_air = minetest.get_content_id("air")
for z = pos.z - 2, pos.z + 2 do
for y = pos.y - 2, pos.y + 2 do
local vi = a:index(pos.x - 2, y, z)
for x = pos.x - 2, pos.x + 2 do
local cid = data[vi]
if cid == c_tnt or cid == c_tnt_boom or cid == c_tnt_burning then
count = count + 1
data[vi] = c_air
end
vi = vi + 1
end
end
end
vm1:set_data(data)
vm1:write_to_map()
-- recalculate new radius
radius = math.floor(radius * math.pow(count, 1/3))
-- perform the explosion
local vm = VoxelManip()
local pr = PseudoRandom(os.time())
p1 = vector.subtract(pos, radius)
p2 = vector.add(pos, radius)
minp, maxp = vm:read_from_map(p1, p2)
a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
data = vm:get_data()
local drops = {}
local on_blast_queue = {}
local on_construct_queue = {}
basic_flame_on_construct = minetest.registered_nodes["fire:basic_flame"].on_construct
local c_fire = minetest.get_content_id("fire:basic_flame")
for z = -radius, radius do
for y = -radius, radius do
local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
for x = -radius, radius do
local r = vector.length(vector.new(x, y, z))
if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
local cid = data[vi]
local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
if cid ~= c_air then
data[vi] = destroy(drops, p, cid, c_air, c_fire,
on_blast_queue, on_construct_queue,
ignore_protection, ignore_on_blast, owner)
end
end
vi = vi + 1
end
end
end
vm:set_data(data)
vm:write_to_map()
vm:update_map()
vm:update_liquids()
-- call check_single_for_falling for everything within 1.5x blast radius
for y = -radius * 1.5, radius * 1.5 do
for z = -radius * 1.5, radius * 1.5 do
for x = -radius * 1.5, radius * 1.5 do
local rad = {x = x, y = y, z = z}
local s = vector.add(pos, rad)
local r = vector.length(rad)
if r / radius < 1.4 then
minetest.check_single_for_falling(s)
end
end
end
end
for _, queued_data in pairs(on_blast_queue) do
local dist = math.max(1, vector.distance(queued_data.pos, pos))
local intensity = (radius * radius) / (dist * dist)
local node_drops = queued_data.on_blast(queued_data.pos, intensity)
if node_drops then
for _, item in pairs(node_drops) do
add_drop(drops, item)
end
end
end
for _, queued_data in pairs(on_construct_queue) do
queued_data.fn(queued_data.pos)
end
minetest.log("action", "TNT owned by " .. owner .. " detonated at " ..
minetest.pos_to_string(pos) .. " with radius " .. radius)
return drops, radius
end
function tnt.boom(pos, def)
local meta = minetest.get_meta(pos)
local owner = meta:get_string("owner")
minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
minetest.set_node(pos, {name = "tnt:boom"})
local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
def.ignore_on_blast, owner)
-- append entity drops
local damage_radius = (radius / def.radius) * def.damage_radius
entity_physics(pos, damage_radius, drops)
if not def.disable_drops then
eject_drops(drops, pos, radius)
end
add_effects(pos, radius, drops)
minetest.log("action", "A TNT explosion occurred at " .. minetest.pos_to_string(pos) ..
" with radius " .. radius)
end
minetest.register_node("tnt:boom", {
drawtype = "airlike",
light_source = default.LIGHT_MAX,
walkable = false,
drop = "",
groups = {dig_immediate = 3},
on_construct = function(pos)
minetest.get_node_timer(pos):start(0.4)
end,
on_timer = function(pos, elapsed)
minetest.remove_node(pos)
end,
-- unaffected by explosions
on_blast = function() end,
})
minetest.register_node("tnt:gunpowder", {
description = "Gun Powder",
drawtype = "raillike",
paramtype = "light",
is_ground_content = false,
sunlight_propagates = true,
walkable = false,
tiles = {
"tnt_gunpowder_straight.png",
"tnt_gunpowder_curved.png",
"tnt_gunpowder_t_junction.png",
"tnt_gunpowder_crossing.png"
},
inventory_image = "tnt_gunpowder_inventory.png",
wield_image = "tnt_gunpowder_inventory.png",
selection_box = {
type = "fixed",
fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
},
groups = {dig_immediate = 2, attached_node = 1, flammable = 5,
connect_to_raillike = minetest.raillike_group("gunpowder")},
sounds = default.node_sound_leaves_defaults(),
on_punch = function(pos, node, puncher)
if puncher:get_wielded_item():get_name() == "default:torch" then
minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
minetest.log("action", puncher:get_player_name() ..
" ignites tnt:gunpowder at " ..
minetest.pos_to_string(pos))
end
end,
on_blast = function(pos, intensity)
minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
end,
on_burn = function(pos)
minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
end,
on_ignite = function(pos, igniter)
minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
end,
})
minetest.register_node("tnt:gunpowder_burning", {
drawtype = "raillike",
paramtype = "light",
sunlight_propagates = true,
walkable = false,
light_source = 5,
tiles = {{
name = "tnt_gunpowder_burning_straight_animated.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
},
{
name = "tnt_gunpowder_burning_curved_animated.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
},
{
name = "tnt_gunpowder_burning_t_junction_animated.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
},
{
name = "tnt_gunpowder_burning_crossing_animated.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
}},
selection_box = {
type = "fixed",
fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
},
drop = "",
groups = {
dig_immediate = 2,
attached_node = 1,
connect_to_raillike = minetest.raillike_group("gunpowder")
},
sounds = default.node_sound_leaves_defaults(),
on_timer = function(pos, elapsed)
for dx = -1, 1 do
for dz = -1, 1 do
for dy = -1, 1 do
if not (dx == 0 and dz == 0) then
tnt.burn({
x = pos.x + dx,
y = pos.y + dy,
z = pos.z + dz,
})
end
end
end
end
minetest.remove_node(pos)
end,
-- unaffected by explosions
on_blast = function() end,
on_construct = function(pos)
minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
minetest.get_node_timer(pos):start(1)
end,
})
minetest.register_craft({
output = "tnt:gunpowder 5",
type = "shapeless",
recipe = {"default:coal_lump", "default:gravel"}
})
if enable_tnt then
minetest.register_craft({
output = "tnt:tnt",
recipe = {
{"group:wood", "tnt:gunpowder", "group:wood"},
{"tnt:gunpowder", "tnt:gunpowder", "tnt:gunpowder"},
{"group:wood", "tnt:gunpowder", "group:wood"}
}
})
minetest.register_abm({
label = "TNT ignition",
nodenames = {"group:tnt", "tnt:gunpowder"},
neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
interval = 4,
chance = 1,
action = function(pos, node)
tnt.burn(pos, node.name)
end,
})
end
function tnt.register_tnt(def)
local name
if not def.name:find(':') then
name = "tnt:" .. def.name
else
name = def.name
def.name = def.name:match(":([%w_]+)")
end
if not def.tiles then def.tiles = {} end
local tnt_top = def.tiles.top or def.name .. "_top.png"
local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
local tnt_side = def.tiles.side or def.name .. "_side.png"
local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
if not def.damage_radius then def.damage_radius = def.radius * 2 end
if enable_tnt then
minetest.register_node(":" .. name, {
description = def.description,
tiles = {tnt_top, tnt_bottom, tnt_side},
is_ground_content = false,
groups = {dig_immediate = 2, mesecon = 2, tnt = 1, flammable = 5},
sounds = default.node_sound_wood_defaults(),
after_place_node = function(pos, placer)
if placer:is_player() then
local meta = minetest.get_meta(pos)
meta:set_string("owner", placer:get_player_name())
end
end,
on_punch = function(pos, node, puncher)
if puncher:get_wielded_item():get_name() == "default:torch" then
minetest.swap_node(pos, {name = name .. "_burning"})
minetest.registered_nodes[name .. "_burning"].on_construct(pos)
minetest.log("action", puncher:get_player_name() ..
" ignites " .. node.name .. " at " ..
minetest.pos_to_string(pos))
end
end,
on_blast = function(pos, intensity)
minetest.after(0.1, function()
tnt.boom(pos, def)
end)
end,
mesecons = {effector =
{action_on =
function(pos)
tnt.boom(pos, def)
end
}
},
on_burn = function(pos)
minetest.swap_node(pos, {name = name .. "_burning"})
minetest.registered_nodes[name .. "_burning"].on_construct(pos)
end,
on_ignite = function(pos, igniter)
minetest.swap_node(pos, {name = name .. "_burning"})
minetest.registered_nodes[name .. "_burning"].on_construct(pos)
end,
})
end
minetest.register_node(":" .. name .. "_burning", {
tiles = {
{
name = tnt_burning,
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1,
}
},
tnt_bottom, tnt_side
},
light_source = 5,
drop = "",
sounds = default.node_sound_wood_defaults(),
groups = {falling_node = 1},
on_timer = function(pos, elapsed)
tnt.boom(pos, def)
end,
-- unaffected by explosions
on_blast = function() end,
on_construct = function(pos)
minetest.sound_play("tnt_ignite", {pos = pos})
minetest.get_node_timer(pos):start(4)
minetest.check_for_falling(pos)
end,
})
end
tnt.register_tnt({
name = "tnt:tnt",
description = "TNT",
radius = tnt_radius,
})