mods/tnt/init.lua

   1 tnt = {}
   2
   3 -- Default to enabled when in singleplayer
   4 local enable_tnt = minetest.setting_getbool("enable_tnt")
   5 if enable_tnt == nil then
   6         enable_tnt = minetest.is_singleplayer()
   7 end
   8
   9 -- loss probabilities array (one in X will be lost)
  10 local loss_prob = {}
  11
  12 loss_prob["default:cobble"] = 3
  13 loss_prob["default:dirt"] = 4
  14
  15 local tnt_radius = tonumber(minetest.setting_get("tnt_radius") or 3)
  16
  17 -- Fill a list with data for content IDs, after all nodes are registered
  18 local cid_data = {}
  19 minetest.after(0, function()
  20         for name, def in pairs(minetest.registered_nodes) do
  21                 cid_data[minetest.get_content_id(name)] = {
  22                         name = name,
  23                         drops = def.drops,
  24                         flammable = def.groups.flammable,
  25                         on_blast = def.on_blast,
  26                 }
  27         end
  28 end)
  29
  30 local function rand_pos(center, pos, radius)
  31         local def
  32         local reg_nodes = minetest.registered_nodes
  33         local i = 0
  34         repeat
  35                 -- Give up and use the center if this takes too long
  36                 if i > 4 then
  37                         pos.x, pos.z = center.x, center.z
  38                         break
  39                 end
  40                 pos.x = center.x + math.random(-radius, radius)
  41                 pos.z = center.z + math.random(-radius, radius)
  42                 def = reg_nodes[minetest.get_node(pos).name]
  43                 i = i + 1
  44         until def and not def.walkable
  45 end
  46
  47 local function eject_drops(drops, pos, radius)
  48         local drop_pos = vector.new(pos)
  49         for _, item in pairs(drops) do
  50                 local count = math.min(item:get_count(), item:get_stack_max())
  51                 while count > 0 do
  52                         local take = math.max(1,math.min(radius * radius,
  53                                         count,
  54                                         item:get_stack_max()))
  55                         rand_pos(pos, drop_pos, radius)
  56                         local dropitem = ItemStack(item)
  57                         dropitem:set_count(take)
  58                         local obj = minetest.add_item(drop_pos, dropitem)
  59                         if obj then
  60                                 obj:get_luaentity().collect = true
  61                                 obj:setacceleration({x = 0, y = -10, z = 0})
  62                                 obj:setvelocity({x = math.random(-3, 3),
  63                                                 y = math.random(0, 10),
  64                                                 z = math.random(-3, 3)})
  65                         end
  66                         count = count - take
  67                 end
  68         end
  69 end
  70
  71 local function add_drop(drops, item)
  72         item = ItemStack(item)
  73         local name = item:get_name()
  74         if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
  75                 return
  76         end
  77
  78         local drop = drops[name]
  79         if drop == nil then
  80                 drops[name] = item
  81         else
  82                 drop:set_count(drop:get_count() + item:get_count())
  83         end
  84 end
  85
  86 local function destroy(drops, npos, cid, c_air, c_fire, on_blast_queue, ignore_protection, ignore_on_blast)
  87         if not ignore_protection and minetest.is_protected(npos, "") then
  88                 return cid
  89         end
  90
  91         local def = cid_data[cid]
  92
  93         if not def then
  94                 return c_air
  95         elseif not ignore_on_blast and def.on_blast then
  96                 on_blast_queue[#on_blast_queue + 1] = {pos = vector.new(npos), on_blast = def.on_blast}
  97                 return cid
  98         elseif def.flammable then
  99                 return c_fire
 100         else
 101                 local node_drops = minetest.get_node_drops(def.name, "")
 102                 for _, item in pairs(node_drops) do
 103                         add_drop(drops, item)
 104                 end
 105                 return c_air
 106         end
 107 end
 108
 109 local function calc_velocity(pos1, pos2, old_vel, power)
 110         -- Avoid errors caused by a vector of zero length
 111         if vector.equals(pos1, pos2) then
 112                 return old_vel
 113         end
 114
 115         local vel = vector.direction(pos1, pos2)
 116         vel = vector.normalize(vel)
 117         vel = vector.multiply(vel, power)
 118
 119         -- Divide by distance
 120         local dist = vector.distance(pos1, pos2)
 121         dist = math.max(dist, 1)
 122         vel = vector.divide(vel, dist)
 123
 124         -- Add old velocity
 125         vel = vector.add(vel, old_vel)
 126
 127         -- randomize it a bit
 128         vel = vector.add(vel, {
 129                 x = math.random() - 0.5,
 130                 y = math.random() - 0.5,
 131                 z = math.random() - 0.5,
 132         })
 133
 134         -- Limit to terminal velocity
 135         dist = vector.length(vel)
 136         if dist > 250 then
 137                 vel = vector.divide(vel, dist / 250)
 138         end
 139         return vel
 140 end
 141
 142 local function entity_physics(pos, radius, drops)
 143         local objs = minetest.get_objects_inside_radius(pos, radius)
 144         for _, obj in pairs(objs) do
 145                 local obj_pos = obj:getpos()
 146                 local dist = math.max(1, vector.distance(pos, obj_pos))
 147
 148                 local damage = (4 / dist) * radius
 149                 if obj:is_player() then
 150                         -- currently the engine has no method to set
 151                         -- player velocity. See #2960
 152                         -- instead, we knock the player back 1.0 node, and slightly upwards
 153                         local dir = vector.normalize(vector.subtract(obj_pos, pos))
 154                         local moveoff = vector.multiply(dir, dist + 1.0)
 155                         local newpos = vector.add(pos, moveoff)
 156                         newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
 157                         obj:setpos(newpos)
 158
 159                         obj:set_hp(obj:get_hp() - damage)
 160                 else
 161                         local do_damage = true
 162                         local do_knockback = true
 163                         local entity_drops = {}
 164                         local luaobj = obj:get_luaentity()
 165                         local objdef = minetest.registered_entities[luaobj.name]
 166
 167                         if objdef and objdef.on_blast then
 168                                 do_damage, do_knockback, entity_drops = objdef.on_blast(luaobj, damage)
 169                         end
 170
 171                         if do_knockback then
 172                                 local obj_vel = obj:getvelocity()
 173                                 obj:setvelocity(calc_velocity(pos, obj_pos,
 174                                                 obj_vel, radius * 10))
 175                         end
 176                         if do_damage then
 177                                 if not obj:get_armor_groups().immortal then
 178                                         obj:punch(obj, 1.0, {
 179                                                 full_punch_interval = 1.0,
 180                                                 damage_groups = {fleshy = damage},
 181                                         }, nil)
 182                                 end
 183                         end
 184                         for _, item in pairs(entity_drops) do
 185                                 add_drop(drops, item)
 186                         end
 187                 end
 188         end
 189 end
 190
 191 local function add_effects(pos, radius, drops)
 192         minetest.add_particle({
 193                 pos = pos,
 194                 velocity = vector.new(),
 195                 acceleration = vector.new(),
 196                 expirationtime = 0.4,
 197                 size = radius * 10,
 198                 collisiondetection = false,
 199                 vertical = false,
 200                 texture = "tnt_boom.png",
 201         })
 202         minetest.add_particlespawner({
 203                 amount = 64,
 204                 time = 0.5,
 205                 minpos = vector.subtract(pos, radius / 2),
 206                 maxpos = vector.add(pos, radius / 2),
 207                 minvel = {x = -10, y = -10, z = -10},
 208                 maxvel = {x = 10, y = 10, z = 10},
 209                 minacc = vector.new(),
 210                 maxacc = vector.new(),
 211                 minexptime = 1,
 212                 maxexptime = 2.5,
 213                 minsize = radius * 3,
 214                 maxsize = radius * 5,
 215                 texture = "tnt_smoke.png",
 216         })
 217
 218         -- we just dropped some items. Look at the items entities and pick
 219         -- one of them to use as texture
 220         local texture = "tnt_blast.png" --fallback texture
 221         local most = 0
 222         for name, stack in pairs(drops) do
 223                 local count = stack:get_count()
 224                 if count > most then
 225                         most = count
 226                         local def = minetest.registered_nodes[name]
 227                         if def and def.tiles and def.tiles[1] then
 228                                 texture = def.tiles[1]
 229                         end
 230                 end
 231         end
 232
 233         minetest.add_particlespawner({
 234                 amount = 64,
 235                 time = 0.1,
 236                 minpos = vector.subtract(pos, radius / 2),
 237                 maxpos = vector.add(pos, radius / 2),
 238                 minvel = {x = -3, y = 0, z = -3},
 239                 maxvel = {x = 3, y = 5,  z = 3},
 240                 minacc = {x = 0, y = -10, z = 0},
 241                 maxacc = {x = 0, y = -10, z = 0},
 242                 minexptime = 0.8,
 243                 maxexptime = 2.0,
 244                 minsize = radius * 0.66,
 245                 maxsize = radius * 2,
 246                 texture = texture,
 247                 collisiondetection = true,
 248         })
 249 end
 250
 251 function tnt.burn(pos, nodename)
 252         local name = nodename or minetest.get_node(pos).name
 253         local group = minetest.get_item_group(name, "tnt")
 254         if group > 0 then
 255                 minetest.sound_play("tnt_ignite", {pos = pos})
 256                 minetest.set_node(pos, {name = name .. "_burning"})
 257                 minetest.get_node_timer(pos):start(1)
 258         elseif name == "tnt:gunpowder" then
 259                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 260         end
 261 end
 262
 263 local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 264         pos = vector.round(pos)
 265         -- scan for adjacent TNT nodes first, and enlarge the explosion
 266         local vm1 = VoxelManip()
 267         local p1 = vector.subtract(pos, 2)
 268         local p2 = vector.add(pos, 2)
 269         local minp, maxp = vm1:read_from_map(p1, p2)
 270         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 271         local data = vm1:get_data()
 272         local count = 0
 273         local c_tnt = minetest.get_content_id("tnt:tnt")
 274         local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
 275         local c_tnt_boom = minetest.get_content_id("tnt:boom")
 276         local c_air = minetest.get_content_id("air")
 277
 278         for z = pos.z - 2, pos.z + 2 do
 279         for y = pos.y - 2, pos.y + 2 do
 280                 local vi = a:index(pos.x - 2, y, z)
 281                 for x = pos.x - 2, pos.x + 2 do
 282                         local cid = data[vi]
 283                         if cid == c_tnt or cid == c_tnt_boom or cid == c_tnt_burning then
 284                                 count = count + 1
 285                                 data[vi] = c_air
 286                         end
 287                         vi = vi + 1
 288                 end
 289         end
 290         end
 291
 292         vm1:set_data(data)
 293         vm1:write_to_map()
 294
 295         -- recalculate new radius
 296         radius = math.floor(radius * math.pow(count, 1/3))
 297
 298         -- perform the explosion
 299         local vm = VoxelManip()
 300         local pr = PseudoRandom(os.time())
 301         p1 = vector.subtract(pos, radius)
 302         p2 = vector.add(pos, radius)
 303         minp, maxp = vm:read_from_map(p1, p2)
 304         a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 305         data = vm:get_data()
 306
 307         local drops = {}
 308         local on_blast_queue = {}
 309
 310         local c_fire = minetest.get_content_id("fire:basic_flame")
 311         for z = -radius, radius do
 312         for y = -radius, radius do
 313         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 314         for x = -radius, radius do
 315                 local r = vector.length(vector.new(x, y, z))
 316                 if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
 317                         local cid = data[vi]
 318                         local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
 319                         if cid ~= c_air then
 320                                 data[vi] = destroy(drops, p, cid, c_air, c_fire,
 321                                         on_blast_queue, ignore_protection,
 322                                         ignore_on_blast)
 323                         end
 324                 end
 325                 vi = vi + 1
 326         end
 327         end
 328         end
 329
 330         vm:set_data(data)
 331         vm:write_to_map()
 332         vm:update_map()
 333         vm:update_liquids()
 334
 335         -- call nodeupdate for everything within 1.5x blast radius
 336         for y = -radius * 1.5, radius * 1.5 do
 337         for z = -radius * 1.5, radius * 1.5 do
 338         for x = -radius * 1.5, radius * 1.5 do
 339                 local rad = {x = x, y = y, z = z}
 340                 local s = vector.add(pos, rad)
 341                 local r = vector.length(rad)
 342                 if r / radius < 1.4 then
 343                         nodeupdate_single(s)
 344                 end
 345         end
 346         end
 347         end
 348
 349         for _, queued_data in pairs(on_blast_queue) do
 350                 local dist = math.max(1, vector.distance(queued_data.pos, pos))
 351                 local intensity = (radius * radius) / (dist * dist)
 352                 local node_drops = queued_data.on_blast(queued_data.pos, intensity)
 353                 if node_drops then
 354                         for _, item in pairs(node_drops) do
 355                                 add_drop(drops, item)
 356                         end
 357                 end
 358         end
 359
 360         return drops, radius
 361 end
 362
 363 function tnt.boom(pos, def)
 364         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 365         minetest.set_node(pos, {name = "tnt:boom"})
 366         local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
 367                         def.ignore_on_blast)
 368         -- append entity drops
 369         local damage_radius = (radius / def.radius) * def.damage_radius
 370         entity_physics(pos, damage_radius, drops)
 371         if not def.disable_drops then
 372                 eject_drops(drops, pos, radius)
 373         end
 374         add_effects(pos, radius, drops)
 375 end
 376
 377 minetest.register_node("tnt:boom", {
 378         drawtype = "airlike",
 379         light_source = default.LIGHT_MAX,
 380         walkable = false,
 381         drop = "",
 382         groups = {dig_immediate = 3},
 383         on_construct = function(pos)
 384                 minetest.get_node_timer(pos):start(0.4)
 385         end,
 386         on_timer = function(pos, elapsed)
 387                 minetest.remove_node(pos)
 388         end,
 389         -- unaffected by explosions
 390         on_blast = function() end,
 391 })
 392
 393 minetest.register_node("tnt:gunpowder", {
 394         description = "Gun Powder",
 395         drawtype = "raillike",
 396         paramtype = "light",
 397         is_ground_content = false,
 398         sunlight_propagates = true,
 399         walkable = false,
 400         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 401         inventory_image = "tnt_gunpowder_inventory.png",
 402         wield_image = "tnt_gunpowder_inventory.png",
 403         selection_box = {
 404                 type = "fixed",
 405                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 406         },
 407         groups = {dig_immediate = 2, attached_node = 1, flammable = 5,
 408                 connect_to_raillike = minetest.raillike_group("gunpowder")},
 409         sounds = default.node_sound_leaves_defaults(),
 410
 411         on_punch = function(pos, node, puncher)
 412                 if puncher:get_wielded_item():get_name() == "default:torch" then
 413                         minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 414                 end
 415         end,
 416         on_blast = function(pos, intensity)
 417                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 418         end,
 419         on_burn = function(pos)
 420                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 421         end
 422 })
 423
 424 minetest.register_node("tnt:gunpowder_burning", {
 425         drawtype = "raillike",
 426         paramtype = "light",
 427         sunlight_propagates = true,
 428         walkable = false,
 429         light_source = 5,
 430         tiles = {{
 431                 name = "tnt_gunpowder_burning_straight_animated.png",
 432                 animation = {
 433                         type = "vertical_frames",
 434                         aspect_w = 16,
 435                         aspect_h = 16,
 436                         length = 1,
 437                 }
 438         },
 439         {
 440                 name = "tnt_gunpowder_burning_curved_animated.png",
 441                 animation = {
 442                         type = "vertical_frames",
 443                         aspect_w = 16,
 444                         aspect_h = 16,
 445                         length = 1,
 446                 }
 447         },
 448         {
 449                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 450                 animation = {
 451                         type = "vertical_frames",
 452                         aspect_w = 16,
 453                         aspect_h = 16,
 454                         length = 1,
 455                 }
 456         },
 457         {
 458                 name = "tnt_gunpowder_burning_crossing_animated.png",
 459                 animation = {
 460                         type = "vertical_frames",
 461                         aspect_w = 16,
 462                         aspect_h = 16,
 463                         length = 1,
 464                 }
 465         }},
 466         selection_box = {
 467                 type = "fixed",
 468                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 469         },
 470         drop = "",
 471         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 472         sounds = default.node_sound_leaves_defaults(),
 473         on_timer = function(pos, elapsed)
 474                 for dx = -1, 1 do
 475                 for dz = -1, 1 do
 476                 for dy = -1, 1 do
 477                         if not (dx == 0 and dz == 0) then
 478                                 tnt.burn({
 479                                         x = pos.x + dx,
 480                                         y = pos.y + dy,
 481                                         z = pos.z + dz,
 482                                 })
 483                         end
 484                 end
 485                 end
 486                 end
 487                 minetest.remove_node(pos)
 488         end,
 489         -- unaffected by explosions
 490         on_blast = function() end,
 491         on_construct = function(pos)
 492                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 493                 minetest.get_node_timer(pos):start(1)
 494         end,
 495 })
 496
 497 minetest.register_craft({
 498         output = "tnt:gunpowder",
 499         type = "shapeless",
 500         recipe = {"default:coal_lump", "default:gravel"}
 501 })
 502
 503 if enable_tnt then
 504         minetest.register_craft({
 505                 output = "tnt:tnt",
 506                 recipe = {
 507                         {"",           "group:wood",    ""},
 508                         {"group:wood", "tnt:gunpowder", "group:wood"},
 509                         {"",           "group:wood",    ""}
 510                 }
 511         })
 512
 513         minetest.register_abm({
 514                 label = "TNT ignition",
 515                 nodenames = {"group:tnt", "tnt:gunpowder"},
 516                 neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 517                 interval = 4,
 518                 chance = 1,
 519                 action = function(pos, node)
 520                         tnt.burn(pos, node.name)
 521                 end,
 522         })
 523 end
 524
 525 function tnt.register_tnt(def)
 526         local name
 527         if not def.name:find(':') then
 528                 name = "tnt:" .. def.name
 529         else
 530                 name = def.name
 531                 def.name = def.name:match(":([%w_]+)")
 532         end
 533         if not def.tiles then def.tiles = {} end
 534         local tnt_top = def.tiles.top or def.name .. "_top.png"
 535         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 536         local tnt_side = def.tiles.side or def.name .. "_side.png"
 537         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 538         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 539
 540         if enable_tnt then
 541                 minetest.register_node(":" .. name, {
 542                         description = def.description,
 543                         tiles = {tnt_top, tnt_bottom, tnt_side},
 544                         is_ground_content = false,
 545                         groups = {dig_immediate = 2, mesecon = 2, tnt = 1, flammable = 5},
 546                         sounds = default.node_sound_wood_defaults(),
 547                         on_punch = function(pos, node, puncher)
 548                                 if puncher:get_wielded_item():get_name() == "default:torch" then
 549                                         minetest.set_node(pos, {name = name .. "_burning"})
 550                                 end
 551                         end,
 552                         on_blast = function(pos, intensity)
 553                                 minetest.after(0.1, function()
 554                                         tnt.boom(pos, def)
 555                                 end)
 556                         end,
 557                         mesecons = {effector =
 558                                 {action_on =
 559                                         function(pos)
 560                                                 tnt.boom(pos, def)
 561                                         end
 562                                 }
 563                         },
 564                         on_burn = function(pos)
 565                                 minetest.set_node(pos, {name = name .. "_burning"})
 566                         end
 567                 })
 568         end
 569
 570         minetest.register_node(":" .. name .. "_burning", {
 571                 tiles = {
 572                         {
 573                                 name = tnt_burning,
 574                                 animation = {
 575                                         type = "vertical_frames",
 576                                         aspect_w = 16,
 577                                         aspect_h = 16,
 578                                         length = 1,
 579                                 }
 580                         },
 581                         tnt_bottom, tnt_side
 582                         },
 583                 light_source = 5,
 584                 drop = "",
 585                 sounds = default.node_sound_wood_defaults(),
 586                 groups = {falling_node = 1},
 587                 on_timer = function(pos, elapsed)
 588                         tnt.boom(pos, def)
 589                 end,
 590                 -- unaffected by explosions
 591                 on_blast = function() end,
 592                 on_construct = function(pos)
 593                         minetest.sound_play("tnt_ignite", {pos = pos})
 594                         minetest.get_node_timer(pos):start(4)
 595                         nodeupdate(pos)
 596                 end,
 597         })
 598 end
 599
 600 tnt.register_tnt({
 601         name = "tnt:tnt",
 602         description = "TNT",
 603         radius = tnt_radius,
 604 })