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                                         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         -- Avoid errors caused by a vector of zero length
 114         if vector.equals(pos1, pos2) then
 115                 return old_vel
 116         end
 117
 118         local vel = vector.direction(pos1, pos2)
 119         vel = vector.normalize(vel)
 120         vel = vector.multiply(vel, power)
 121
 122         -- Divide by distance
 123         local dist = vector.distance(pos1, pos2)
 124         dist = math.max(dist, 1)
 125         vel = vector.divide(vel, dist)
 126
 127         -- Add old velocity
 128         vel = vector.add(vel, old_vel)
 129
 130         -- randomize it a bit
 131         vel = vector.add(vel, {
 132                 x = math.random() - 0.5,
 133                 y = math.random() - 0.5,
 134                 z = math.random() - 0.5,
 135         })
 136
 137         -- Limit to terminal velocity
 138         dist = vector.length(vel)
 139         if dist > 250 then
 140                 vel = vector.divide(vel, dist / 250)
 141         end
 142         return vel
 143 end
 144
 145 local function entity_physics(pos, radius, drops)
 146         local objs = minetest.get_objects_inside_radius(pos, radius)
 147         for _, obj in pairs(objs) do
 148                 local obj_pos = obj:getpos()
 149                 local dist = math.max(1, vector.distance(pos, obj_pos))
 150
 151                 local damage = (4 / dist) * radius
 152                 if obj:is_player() then
 153                         -- currently the engine has no method to set
 154                         -- player velocity. See #2960
 155                         -- instead, we knock the player back 1.0 node, and slightly upwards
 156                         local dir = vector.normalize(vector.subtract(obj_pos, pos))
 157                         local moveoff = vector.multiply(dir, dist + 1.0)
 158                         local newpos = vector.add(pos, moveoff)
 159                         local newpos = vector.add(newpos, {x = 0, y = 0.2, z = 0})
 160                         obj:setpos(newpos)
 161
 162                         obj:set_hp(obj:get_hp() - damage)
 163                 else
 164                         local do_damage = true
 165                         local do_knockback = true
 166                         local entity_drops = {}
 167                         local luaobj = obj:get_luaentity()
 168                         local objdef = minetest.registered_entities[luaobj.name]
 169
 170                         if objdef and objdef.on_blast then
 171                                 do_damage, do_knockback, entity_drops = objdef.on_blast(luaobj, damage)
 172                         end
 173
 174                         if do_knockback then
 175                                 local obj_vel = obj:getvelocity()
 176                                 obj:setvelocity(calc_velocity(pos, obj_pos,
 177                                                 obj_vel, radius * 10))
 178                         end
 179                         if do_damage then
 180                                 if not obj:get_armor_groups().immortal then
 181                                         obj:punch(obj, 1.0, {
 182                                                 full_punch_interval = 1.0,
 183                                                 damage_groups = {fleshy = damage},
 184                                         }, nil)
 185                                 end
 186                         end
 187                         for _, item in ipairs(entity_drops) do
 188                                 add_drop(drops, item)
 189                         end
 190                 end
 191         end
 192 end
 193
 194 local function add_effects(pos, radius, drops)
 195         minetest.add_particle({
 196                 pos = pos,
 197                 velocity = vector.new(),
 198                 acceleration = vector.new(),
 199                 expirationtime = 0.4,
 200                 size = radius * 10,
 201                 collisiondetection = false,
 202                 vertical = false,
 203                 texture = "tnt_boom.png",
 204         })
 205         minetest.add_particlespawner({
 206                 amount = 64,
 207                 time = 0.5,
 208                 minpos = vector.subtract(pos, radius / 2),
 209                 maxpos = vector.add(pos, radius / 2),
 210                 minvel = {x = -10, y = -10, z = -10},
 211                 maxvel = {x = 10, y = 10, z = 10},
 212                 minacc = vector.new(),
 213                 maxacc = vector.new(),
 214                 minexptime = 1,
 215                 maxexptime = 2.5,
 216                 minsize = radius * 3,
 217                 maxsize = radius * 5,
 218                 texture = "tnt_smoke.png",
 219         })
 220
 221         -- we just dropped some items. Look at the items entities and pick
 222         -- one of them to use as texture
 223         local texture = "tnt_blast.png" --fallback texture
 224         local most = 0
 225         for name, stack in pairs(drops) do
 226                 local count = stack:get_count()
 227                 if count > most then
 228                         most = count
 229                         local def = minetest.registered_nodes[name]
 230                         if def and def.tiles and def.tiles[1] then
 231                                 texture = def.tiles[1]
 232                         end
 233                 end
 234         end
 235
 236         minetest.add_particlespawner({
 237                 amount = 64,
 238                 time = 0.1,
 239                 minpos = vector.subtract(pos, radius / 2),
 240                 maxpos = vector.add(pos, radius / 2),
 241                 minvel = {x = -3, y = 0, z = -3},
 242                 maxvel = {x = 3, y = 5,  z = 3},
 243                 minacc = {x = 0, y = -10, z = 0},
 244                 maxacc = {x = 0, y = -10, z = 0},
 245                 minexptime = 0.8,
 246                 maxexptime = 2.0,
 247                 minsize = radius * 0.66,
 248                 maxsize = radius * 2,
 249                 texture = texture,
 250                 collisiondetection = true,
 251         })
 252 end
 253
 254 function tnt.burn(pos)
 255         local name = minetest.get_node(pos).name
 256         local group = minetest.get_item_group(name, "tnt")
 257         if group > 0 then
 258                 minetest.sound_play("tnt_ignite", {pos = pos})
 259                 minetest.set_node(pos, {name = name .. "_burning"})
 260                 minetest.get_node_timer(pos):start(1)
 261         elseif name == "tnt:gunpowder" then
 262                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 263         end
 264 end
 265
 266 local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 267         local pos = vector.round(pos)
 268         -- scan for adjacent TNT nodes first, and enlarge the explosion
 269         local vm1 = VoxelManip()
 270         local p1 = vector.subtract(pos, 2)
 271         local p2 = vector.add(pos, 2)
 272         local minp, maxp = vm1:read_from_map(p1, p2)
 273         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 274         local data = vm1:get_data()
 275         local count = 0
 276         local c_tnt = minetest.get_content_id("tnt:tnt")
 277         local c_tnt_burning = minetest.get_content_id("tnt:tnt_burning")
 278         local c_tnt_boom = minetest.get_content_id("tnt:boom")
 279         local c_air = minetest.get_content_id("air")
 280
 281         for z = pos.z - 2, pos.z + 2 do
 282         for y = pos.y - 2, pos.y + 2 do
 283                 local vi = a:index(pos.x - 2, y, z)
 284                 for x = pos.x - 2, pos.x + 2 do
 285                         local cid = data[vi]
 286                         if cid == c_tnt or cid == c_tnt_boom or cid == c_tnt_burning then
 287                                 count = count + 1
 288                                 data[vi] = c_air
 289                         end
 290                         vi = vi + 1
 291                 end
 292         end
 293         end
 294
 295         vm1:set_data(data)
 296         vm1:write_to_map()
 297
 298         -- recalculate new radius
 299         radius = math.floor(radius * math.pow(count, 1/3))
 300
 301         -- perform the explosion
 302         local vm = VoxelManip()
 303         local pr = PseudoRandom(os.time())
 304         local p1 = vector.subtract(pos, radius)
 305         local p2 = vector.add(pos, radius)
 306         local minp, maxp = vm:read_from_map(p1, p2)
 307         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 308         local data = vm:get_data()
 309
 310         local drops = {}
 311         local on_blast_queue = {}
 312
 313         local c_fire = minetest.get_content_id("fire:basic_flame")
 314         for z = -radius, radius do
 315         for y = -radius, radius do
 316         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 317         for x = -radius, radius do
 318                 local r = vector.length(vector.new(x, y, z))
 319                 if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
 320                         local cid = data[vi]
 321                         local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
 322                         if cid ~= c_air then
 323                                 data[vi] = destroy(drops, p, cid, c_air, c_fire,
 324                                         on_blast_queue, ignore_protection,
 325                                         ignore_on_blast)
 326                         end
 327                 end
 328                 vi = vi + 1
 329         end
 330         end
 331         end
 332
 333         vm:set_data(data)
 334         vm:write_to_map()
 335         vm:update_map()
 336         vm:update_liquids()
 337
 338         -- call nodeupdate for everything within 1.5x blast radius
 339         for z = -radius * 1.5, radius * 1.5 do
 340         for x = -radius * 1.5, radius * 1.5 do
 341         for y = -radius * 1.5, radius * 1.5 do
 342                 local s = vector.add(pos, {x = x, y = y, z = z})
 343                 local r = vector.distance(pos, s)
 344                 if r / radius < 1.4 then
 345                         nodeupdate(s)
 346                 end
 347         end
 348         end
 349         end
 350
 351         for _, data in ipairs(on_blast_queue) do
 352                 local dist = math.max(1, vector.distance(data.pos, pos))
 353                 local intensity = (radius * radius) / (dist * dist)
 354                 local node_drops = data.on_blast(data.pos, intensity)
 355                 if node_drops then
 356                         for _, item in ipairs(node_drops) do
 357                                 add_drop(drops, item)
 358                         end
 359                 end
 360         end
 361
 362         return drops, radius
 363 end
 364
 365 function tnt.boom(pos, def)
 366         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 367         minetest.set_node(pos, {name = "tnt:boom"})
 368         local drops, radius = tnt_explode(pos, def.radius, def.ignore_protection,
 369                         def.ignore_on_blast)
 370         -- append entity drops
 371         local damage_radius = (radius / def.radius) * def.damage_radius
 372         entity_physics(pos, damage_radius, drops)
 373         if not def.disable_drops then
 374                 eject_drops(drops, pos, radius)
 375         end
 376         add_effects(pos, radius, drops)
 377 end
 378
 379 minetest.register_node("tnt:boom", {
 380         drawtype = "airlike",
 381         light_source = default.LIGHT_MAX,
 382         walkable = false,
 383         drop = "",
 384         groups = {dig_immediate = 3},
 385         on_construct = function(pos)
 386                 minetest.get_node_timer(pos):start(0.4)
 387         end,
 388         on_timer = function(pos, elapsed)
 389                 minetest.remove_node(pos)
 390         end,
 391         -- unaffected by explosions
 392         on_blast = function() end,
 393 })
 394
 395 minetest.register_node("tnt:gunpowder", {
 396         description = "Gun Powder",
 397         drawtype = "raillike",
 398         paramtype = "light",
 399         is_ground_content = false,
 400         sunlight_propagates = true,
 401         walkable = false,
 402         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 403         inventory_image = "tnt_gunpowder_inventory.png",
 404         wield_image = "tnt_gunpowder_inventory.png",
 405         selection_box = {
 406                 type = "fixed",
 407                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 408         },
 409         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 410         sounds = default.node_sound_leaves_defaults(),
 411
 412         on_punch = function(pos, node, puncher)
 413                 if puncher:get_wielded_item():get_name() == "default:torch" then
 414                         tnt.burn(pos)
 415                 end
 416         end,
 417         on_blast = function(pos, intensity)
 418                 tnt.burn(pos)
 419         end,
 420 })
 421
 422 minetest.register_node("tnt:gunpowder_burning", {
 423         drawtype = "raillike",
 424         paramtype = "light",
 425         sunlight_propagates = true,
 426         walkable = false,
 427         light_source = 5,
 428         tiles = {{
 429                 name = "tnt_gunpowder_burning_straight_animated.png",
 430                 animation = {
 431                         type = "vertical_frames",
 432                         aspect_w = 16,
 433                         aspect_h = 16,
 434                         length = 1,
 435                 }
 436         },
 437         {
 438                 name = "tnt_gunpowder_burning_curved_animated.png",
 439                 animation = {
 440                         type = "vertical_frames",
 441                         aspect_w = 16,
 442                         aspect_h = 16,
 443                         length = 1,
 444                 }
 445         },
 446         {
 447                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 448                 animation = {
 449                         type = "vertical_frames",
 450                         aspect_w = 16,
 451                         aspect_h = 16,
 452                         length = 1,
 453                 }
 454         },
 455         {
 456                 name = "tnt_gunpowder_burning_crossing_animated.png",
 457                 animation = {
 458                         type = "vertical_frames",
 459                         aspect_w = 16,
 460                         aspect_h = 16,
 461                         length = 1,
 462                 }
 463         }},
 464         selection_box = {
 465                 type = "fixed",
 466                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 467         },
 468         drop = "",
 469         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 470         sounds = default.node_sound_leaves_defaults(),
 471         on_timer = function(pos, elapsed)
 472                 for dx = -1, 1 do
 473                 for dz = -1, 1 do
 474                 for dy = -1, 1 do
 475                         if not (dx == 0 and dz == 0) then
 476                                 tnt.burn({
 477                                         x = pos.x + dx,
 478                                         y = pos.y + dy,
 479                                         z = pos.z + dz,
 480                                 })
 481                         end
 482                 end
 483                 end
 484                 end
 485                 minetest.remove_node(pos)
 486         end,
 487         -- unaffected by explosions
 488         on_blast = function() end,
 489         on_construct = function(pos)
 490                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 491                 minetest.get_node_timer(pos):start(1)
 492         end,
 493 })
 494
 495 minetest.register_abm({
 496         nodenames = {"group:tnt", "tnt:gunpowder"},
 497         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 498         interval = 4,
 499         chance = 1,
 500         action = tnt.burn,
 501 })
 502
 503 minetest.register_craft({
 504         output = "tnt:gunpowder",
 505         type = "shapeless",
 506         recipe = {"default:coal_lump", "default:gravel"}
 507 })
 508
 509 minetest.register_craft({
 510         output = "tnt:tnt",
 511         recipe = {
 512                 {"",           "group:wood",    ""},
 513                 {"group:wood", "tnt:gunpowder", "group:wood"},
 514                 {"",           "group:wood",    ""}
 515         }
 516 })
 517
 518 function tnt.register_tnt(def)
 519         local name = ""
 520         if not def.name:find(':') then
 521                 name = "tnt:" .. def.name
 522         else
 523                 name = def.name
 524                 def.name = def.name:match(":([%w_]+)")
 525         end
 526         if not def.tiles then def.tiles = {} end
 527         local tnt_top = def.tiles.top or def.name .. "_top.png"
 528         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 529         local tnt_side = def.tiles.side or def.name .. "_side.png"
 530         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 531         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 532
 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
 558         minetest.register_node(":" .. name .. "_burning", {
 559                 tiles = {
 560                         {
 561                                 name = tnt_burning,
 562                                 animation = {
 563                                         type = "vertical_frames",
 564                                         aspect_w = 16,
 565                                         aspect_h = 16,
 566                                         length = 1,
 567                                 }
 568                         },
 569                         tnt_bottom, tnt_side
 570                         },
 571                 light_source = 5,
 572                 drop = "",
 573                 sounds = default.node_sound_wood_defaults(),
 574                 groups = {falling_node = 1},
 575                 on_timer = function(pos, elapsed)
 576                         tnt.boom(pos, def)
 577                 end,
 578                 -- unaffected by explosions
 579                 on_blast = function() end,
 580                 on_construct = function(pos)
 581                         minetest.sound_play("tnt_ignite", {pos = pos})
 582                         minetest.get_node_timer(pos):start(4)
 583                         nodeupdate(pos)
 584                 end,
 585         })
 586 end
 587
 588 tnt.register_tnt({
 589         name = "tnt:tnt",
 590         description = "TNT",
 591         radius = radius,
 592 })
 593