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 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 = item:get_count()
  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 ipairs(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 ipairs(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)
 252         local name = 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 z = -radius * 1.5, radius * 1.5 do
 337         for x = -radius * 1.5, radius * 1.5 do
 338         for y = -radius * 1.5, radius * 1.5 do
 339                 local s = vector.add(pos, {x = x, y = y, z = z})
 340                 local r = vector.distance(pos, s)
 341                 if r / radius < 1.4 then
 342                         nodeupdate(s)
 343                 end
 344         end
 345         end
 346         end
 347
 348         for _, data in ipairs(on_blast_queue) do
 349                 local dist = math.max(1, vector.distance(data.pos, pos))
 350                 local intensity = (radius * radius) / (dist * dist)
 351                 local node_drops = data.on_blast(data.pos, intensity)
 352                 if node_drops then
 353                         for _, item in ipairs(node_drops) do
 354                                 add_drop(drops, item)
 355                         end
 356                 end
 357         end
 358
 359         return drops, radius
 360 end
 361
 362 function tnt.boom(pos, def)
 363         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 364         minetest.set_node(pos, {name = "tnt:boom"})
 365         local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
 366                         def.ignore_on_blast)
 367         -- append entity drops
 368         local damage_radius = (radius / def.radius) * def.damage_radius
 369         entity_physics(pos, damage_radius, drops)
 370         if not def.disable_drops then
 371                 eject_drops(drops, pos, radius)
 372         end
 373         add_effects(pos, radius, drops)
 374 end
 375
 376 minetest.register_node("tnt:boom", {
 377         drawtype = "airlike",
 378         light_source = default.LIGHT_MAX,
 379         walkable = false,
 380         drop = "",
 381         groups = {dig_immediate = 3},
 382         on_construct = function(pos)
 383                 minetest.get_node_timer(pos):start(0.4)
 384         end,
 385         on_timer = function(pos, elapsed)
 386                 minetest.remove_node(pos)
 387         end,
 388         -- unaffected by explosions
 389         on_blast = function() end,
 390 })
 391
 392 minetest.register_node("tnt:gunpowder", {
 393         description = "Gun Powder",
 394         drawtype = "raillike",
 395         paramtype = "light",
 396         is_ground_content = false,
 397         sunlight_propagates = true,
 398         walkable = false,
 399         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 400         inventory_image = "tnt_gunpowder_inventory.png",
 401         wield_image = "tnt_gunpowder_inventory.png",
 402         selection_box = {
 403                 type = "fixed",
 404                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 405         },
 406         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 407         sounds = default.node_sound_leaves_defaults(),
 408
 409         on_punch = function(pos, node, puncher)
 410                 if puncher:get_wielded_item():get_name() == "default:torch" then
 411                         tnt.burn(pos)
 412                 end
 413         end,
 414         on_blast = function(pos, intensity)
 415                 tnt.burn(pos)
 416         end,
 417 })
 418
 419 minetest.register_node("tnt:gunpowder_burning", {
 420         drawtype = "raillike",
 421         paramtype = "light",
 422         sunlight_propagates = true,
 423         walkable = false,
 424         light_source = 5,
 425         tiles = {{
 426                 name = "tnt_gunpowder_burning_straight_animated.png",
 427                 animation = {
 428                         type = "vertical_frames",
 429                         aspect_w = 16,
 430                         aspect_h = 16,
 431                         length = 1,
 432                 }
 433         },
 434         {
 435                 name = "tnt_gunpowder_burning_curved_animated.png",
 436                 animation = {
 437                         type = "vertical_frames",
 438                         aspect_w = 16,
 439                         aspect_h = 16,
 440                         length = 1,
 441                 }
 442         },
 443         {
 444                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 445                 animation = {
 446                         type = "vertical_frames",
 447                         aspect_w = 16,
 448                         aspect_h = 16,
 449                         length = 1,
 450                 }
 451         },
 452         {
 453                 name = "tnt_gunpowder_burning_crossing_animated.png",
 454                 animation = {
 455                         type = "vertical_frames",
 456                         aspect_w = 16,
 457                         aspect_h = 16,
 458                         length = 1,
 459                 }
 460         }},
 461         selection_box = {
 462                 type = "fixed",
 463                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 464         },
 465         drop = "",
 466         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 467         sounds = default.node_sound_leaves_defaults(),
 468         on_timer = function(pos, elapsed)
 469                 for dx = -1, 1 do
 470                 for dz = -1, 1 do
 471                 for dy = -1, 1 do
 472                         if not (dx == 0 and dz == 0) then
 473                                 tnt.burn({
 474                                         x = pos.x + dx,
 475                                         y = pos.y + dy,
 476                                         z = pos.z + dz,
 477                                 })
 478                         end
 479                 end
 480                 end
 481                 end
 482                 minetest.remove_node(pos)
 483         end,
 484         -- unaffected by explosions
 485         on_blast = function() end,
 486         on_construct = function(pos)
 487                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 488                 minetest.get_node_timer(pos):start(1)
 489         end,
 490 })
 491
 492 minetest.register_craft({
 493         output = "tnt:gunpowder",
 494         type = "shapeless",
 495         recipe = {"default:coal_lump", "default:gravel"}
 496 })
 497
 498 if enable_tnt then
 499         minetest.register_craft({
 500                 output = "tnt:tnt",
 501                 recipe = {
 502                         {"",           "group:wood",    ""},
 503                         {"group:wood", "tnt:gunpowder", "group:wood"},
 504                         {"",           "group:wood",    ""}
 505                 }
 506         })
 507
 508         minetest.register_abm({
 509                 nodenames = {"group:tnt", "tnt:gunpowder"},
 510                 neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 511                 interval = 4,
 512                 chance = 1,
 513                 action = tnt.burn,
 514         })
 515 end
 516
 517 function tnt.register_tnt(def)
 518         local name
 519         if not def.name:find(':') then
 520                 name = "tnt:" .. def.name
 521         else
 522                 name = def.name
 523                 def.name = def.name:match(":([%w_]+)")
 524         end
 525         if not def.tiles then def.tiles = {} end
 526         local tnt_top = def.tiles.top or def.name .. "_top.png"
 527         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 528         local tnt_side = def.tiles.side or def.name .. "_side.png"
 529         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 530         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 531
 532         if enable_tnt then
 533                 minetest.register_node(":" .. name, {
 534                         description = def.description,
 535                         tiles = {tnt_top, tnt_bottom, tnt_side},
 536                         is_ground_content = false,
 537                         groups = {dig_immediate = 2, mesecon = 2, tnt = 1},
 538                         sounds = default.node_sound_wood_defaults(),
 539                         on_punch = function(pos, node, puncher)
 540                                 if puncher:get_wielded_item():get_name() == "default:torch" then
 541                                         minetest.set_node(pos, {name = name .. "_burning"})
 542                                 end
 543                         end,
 544                         on_blast = function(pos, intensity)
 545                                 minetest.after(0.1, function()
 546                                         tnt.boom(pos, def)
 547                                 end)
 548                         end,
 549                         mesecons = {effector =
 550                                 {action_on =
 551                                         function(pos)
 552                                                 tnt.boom(pos, def)
 553                                         end
 554                                 }
 555                         },
 556                 })
 557         end
 558
 559         minetest.register_node(":" .. name .. "_burning", {
 560                 tiles = {
 561                         {
 562                                 name = tnt_burning,
 563                                 animation = {
 564                                         type = "vertical_frames",
 565                                         aspect_w = 16,
 566                                         aspect_h = 16,
 567                                         length = 1,
 568                                 }
 569                         },
 570                         tnt_bottom, tnt_side
 571                         },
 572                 light_source = 5,
 573                 drop = "",
 574                 sounds = default.node_sound_wood_defaults(),
 575                 groups = {falling_node = 1},
 576                 on_timer = function(pos, elapsed)
 577                         tnt.boom(pos, def)
 578                 end,
 579                 -- unaffected by explosions
 580                 on_blast = function() end,
 581                 on_construct = function(pos)
 582                         minetest.sound_play("tnt_ignite", {pos = pos})
 583                         minetest.get_node_timer(pos):start(4)
 584                         nodeupdate(pos)
 585                 end,
 586         })
 587 end
 588
 589 tnt.register_tnt({
 590         name = "tnt:tnt",
 591         description = "TNT",
 592         radius = radius,
 593 })