mods/tnt/init.lua

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