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                 local take_est = math.log(count * count) + math.random(0,4) - 2
  53                 while count > 0 do
  54                         local take = math.max(1,math.min(take_est,
  55                                         item:get_count(),
  56                                         item:get_stack_max()))
  57                         rand_pos(pos, drop_pos, radius)
  58                         local dropitem = ItemStack(item)
  59                         dropitem:set_count(take)
  60                         local obj = minetest.add_item(drop_pos, dropitem)
  61                         if obj then
  62                                 obj:get_luaentity().collect = true
  63                                 obj:setacceleration({x = 0, y = -10, z = 0})
  64                                 obj:setvelocity({x = math.random(-3, 3),
  65                                                 y = math.random(0, 10),
  66                                                 z = math.random(-3, 3)})
  67                         end
  68                         count = count - take
  69                 end
  70         end
  71 end
  72
  73 local function add_drop(drops, item)
  74         item = ItemStack(item)
  75         local name = item:get_name()
  76         if loss_prob[name] ~= nil and math.random(1, loss_prob[name]) == 1 then
  77                 return
  78         end
  79
  80         local drop = drops[name]
  81         if drop == nil then
  82                 drops[name] = item
  83         else
  84                 drop:set_count(drop:get_count() + item:get_count())
  85         end
  86 end
  87
  88
  89 local function destroy(drops, npos, cid, c_air, c_fire, on_blast_queue, ignore_protection, ignore_on_blast)
  90         if not ignore_protection and minetest.is_protected(npos, "") then
  91                 return cid
  92         end
  93
  94         local def = cid_data[cid]
  95
  96         if not def then
  97                 return c_air
  98         elseif not ignore_on_blast and def.on_blast then
  99                 on_blast_queue[#on_blast_queue + 1] = {pos = vector.new(npos), on_blast = def.on_blast}
 100                 return cid
 101         elseif def.flammable then
 102                 return c_fire
 103         else
 104                 local node_drops = minetest.get_node_drops(def.name, "")
 105                 for _, item in ipairs(node_drops) do
 106                         add_drop(drops, item)
 107                 end
 108                 return c_air
 109         end
 110 end
 111
 112
 113 local function calc_velocity(pos1, pos2, old_vel, power)
 114         local vel = vector.direction(pos1, pos2)
 115         vel = vector.normalize(vel)
 116         vel = vector.multiply(vel, power)
 117
 118         -- Divide by distance
 119         local dist = vector.distance(pos1, pos2)
 120         dist = math.max(dist, 1)
 121         vel = vector.divide(vel, dist)
 122
 123         -- Add old velocity
 124         vel = vector.add(vel, old_vel)
 125
 126         -- Limit to terminal velocity
 127         dist = vector.length(vel)
 128         if dist > 250 then
 129                 vel = vector.divide(vel, dist / 250)
 130         end
 131         return vel
 132 end
 133
 134 local function entity_physics(pos, radius)
 135         local objs = minetest.get_objects_inside_radius(pos, radius)
 136         for _, obj in pairs(objs) do
 137                 local obj_pos = obj:getpos()
 138                 local obj_vel = obj:getvelocity()
 139                 local dist = math.max(1, vector.distance(pos, obj_pos))
 140
 141                 if obj_vel ~= nil then
 142                         obj:setvelocity(calc_velocity(pos, obj_pos,
 143                                         obj_vel, radius * 10))
 144                 end
 145
 146                 local damage = (4 / dist) * radius
 147                 obj:set_hp(obj:get_hp() - damage)
 148         end
 149 end
 150
 151 local function add_effects(pos, radius, drops)
 152         minetest.add_particlespawner({
 153                 amount = 128,
 154                 time = 1,
 155                 minpos = vector.subtract(pos, radius / 2),
 156                 maxpos = vector.add(pos, radius / 2),
 157                 minvel = {x = -20, y = -20, z = -20},
 158                 maxvel = {x = 20, y = 20, z = 20},
 159                 minacc = vector.new(),
 160                 maxacc = vector.new(),
 161                 minexptime = 1,
 162                 maxexptime = 3,
 163                 minsize = 8,
 164                 maxsize = 16,
 165                 texture = "tnt_smoke.png",
 166         })
 167
 168         -- we just dropped some items. Look at the items entities and pick
 169         -- one of them to use as texture
 170         local texture = "tnt_blast.png" --fallback texture
 171         local most = 0
 172         for name, stack in pairs(drops) do
 173                 local count = stack:get_count()
 174                 if count > most then
 175                         most = count
 176                         local def = minetest.registered_nodes[name]
 177                         if def and def.tiles and def.tiles[1] then
 178                                 texture = def.tiles[1]
 179                         end
 180                 end
 181         end
 182
 183         minetest.add_particlespawner({
 184                 amount = 64,
 185                 time = 0.1,
 186                 minpos = vector.subtract(pos, radius / 2),
 187                 maxpos = vector.add(pos, radius / 2),
 188                 minvel = {x = -3, y = 0, z = -3},
 189                 maxvel = {x = 3, y = 5,  z = 3},
 190                 minacc = {x = 0, y = -10, z = 0},
 191                 maxacc = {x = 0, y = -10, z = 0},
 192                 minexptime = 0.8,
 193                 maxexptime = 2.0,
 194                 minsize = 2,
 195                 maxsize = 6,
 196                 texture = texture,
 197                 collisiondetection = true,
 198         })
 199 end
 200
 201 function tnt.burn(pos)
 202         local name = minetest.get_node(pos).name
 203         local group = minetest.get_item_group(name, "tnt")
 204         if group > 0 then
 205                 minetest.sound_play("tnt_ignite", {pos = pos})
 206                 minetest.set_node(pos, {name = name .. "_burning"})
 207                 minetest.get_node_timer(pos):start(1)
 208         elseif name == "tnt:gunpowder" then
 209                 minetest.set_node(pos, {name = "tnt:gunpowder_burning"})
 210         end
 211 end
 212
 213 local function tnt_explode(pos, radius, ignore_protection, ignore_on_blast)
 214         local pos = vector.round(pos)
 215         local vm = VoxelManip()
 216         local pr = PseudoRandom(os.time())
 217         local p1 = vector.subtract(pos, radius)
 218         local p2 = vector.add(pos, radius)
 219         local minp, maxp = vm:read_from_map(p1, p2)
 220         local a = VoxelArea:new({MinEdge = minp, MaxEdge = maxp})
 221         local data = vm:get_data()
 222
 223         local drops = {}
 224         local on_blast_queue = {}
 225
 226         local c_air = minetest.get_content_id("air")
 227         local c_fire = minetest.get_content_id("fire:basic_flame")
 228         for z = -radius, radius do
 229         for y = -radius, radius do
 230         local vi = a:index(pos.x + (-radius), pos.y + y, pos.z + z)
 231         for x = -radius, radius do
 232                 local r = vector.length(vector.new(x, y, z))
 233                 if (radius * radius) / (r * r) >= (pr:next(80, 125) / 100) then
 234                         local cid = data[vi]
 235                         local p = {x = pos.x + x, y = pos.y + y, z = pos.z + z}
 236                         if cid ~= c_air then
 237                                 data[vi] = destroy(drops, p, cid, c_air, c_fire,
 238                                         on_blast_queue, ignore_protection,
 239                                         ignore_on_blast)
 240                         end
 241                 end
 242                 vi = vi + 1
 243         end
 244         end
 245         end
 246
 247         vm:set_data(data)
 248         vm:write_to_map()
 249         vm:update_map()
 250         vm:update_liquids()
 251
 252         -- call nodeupdate for everything within 1.5x blast radius
 253         for z = -radius * 1.5, radius * 1.5 do
 254         for x = -radius * 1.5, radius * 1.5 do
 255         for y = -radius * 1.5, radius * 1.5 do
 256                 local s = vector.add(pos, {x = x, y = y, z = z})
 257                 local r = vector.distance(pos, s)
 258                 if r / radius < 1.4 then
 259                         nodeupdate(s)
 260                 end
 261         end
 262         end
 263         end
 264
 265         for _, data in ipairs(on_blast_queue) do
 266                 local dist = math.max(1, vector.distance(data.pos, pos))
 267                 local intensity = (radius * radius) / (dist * dist)
 268                 local node_drops = data.on_blast(data.pos, intensity)
 269                 if node_drops then
 270                         for _, item in ipairs(node_drops) do
 271                                 add_drop(drops, item)
 272                         end
 273                 end
 274         end
 275
 276         return drops
 277 end
 278
 279 function tnt.boom(pos, def)
 280         minetest.sound_play("tnt_explode", {pos = pos, gain = 1.5, max_hear_distance = 2*64})
 281         minetest.set_node(pos, {name = "tnt:boom"})
 282         minetest.get_node_timer(pos):start(0.5)
 283         local drops = tnt_explode(pos, def.radius, def.ignore_protection,
 284                         def.ignore_on_blast)
 285         entity_physics(pos, def.damage_radius)
 286         if not def.disable_drops then
 287                 eject_drops(drops, pos, def.radius)
 288         end
 289         add_effects(pos, def.radius, drops)
 290 end
 291
 292 minetest.register_node("tnt:boom", {
 293         drawtype = "plantlike",
 294         tiles = {"tnt_boom.png"},
 295         light_source = default.LIGHT_MAX,
 296         walkable = false,
 297         drop = "",
 298         groups = {dig_immediate = 3},
 299         on_timer = function(pos, elapsed)
 300                 minetest.remove_node(pos)
 301         end,
 302         -- unaffected by explosions
 303         on_blast = function() end,
 304 })
 305
 306 minetest.register_node("tnt:gunpowder", {
 307         description = "Gun Powder",
 308         drawtype = "raillike",
 309         paramtype = "light",
 310         is_ground_content = false,
 311         sunlight_propagates = true,
 312         walkable = false,
 313         tiles = {"tnt_gunpowder_straight.png", "tnt_gunpowder_curved.png", "tnt_gunpowder_t_junction.png", "tnt_gunpowder_crossing.png"},
 314         inventory_image = "tnt_gunpowder_inventory.png",
 315         wield_image = "tnt_gunpowder_inventory.png",
 316         selection_box = {
 317                 type = "fixed",
 318                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 319         },
 320         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 321         sounds = default.node_sound_leaves_defaults(),
 322
 323         on_punch = function(pos, node, puncher)
 324                 if puncher:get_wielded_item():get_name() == "default:torch" then
 325                         tnt.burn(pos)
 326                 end
 327         end,
 328         on_blast = function(pos, intensity)
 329                 tnt.burn(pos)
 330         end,
 331 })
 332
 333 minetest.register_node("tnt:gunpowder_burning", {
 334         drawtype = "raillike",
 335         paramtype = "light",
 336         sunlight_propagates = true,
 337         walkable = false,
 338         light_source = 5,
 339         tiles = {{
 340                 name = "tnt_gunpowder_burning_straight_animated.png",
 341                 animation = {
 342                         type = "vertical_frames",
 343                         aspect_w = 16,
 344                         aspect_h = 16,
 345                         length = 1,
 346                 }
 347         },
 348         {
 349                 name = "tnt_gunpowder_burning_curved_animated.png",
 350                 animation = {
 351                         type = "vertical_frames",
 352                         aspect_w = 16,
 353                         aspect_h = 16,
 354                         length = 1,
 355                 }
 356         },
 357         {
 358                 name = "tnt_gunpowder_burning_t_junction_animated.png",
 359                 animation = {
 360                         type = "vertical_frames",
 361                         aspect_w = 16,
 362                         aspect_h = 16,
 363                         length = 1,
 364                 }
 365         },
 366         {
 367                 name = "tnt_gunpowder_burning_crossing_animated.png",
 368                 animation = {
 369                         type = "vertical_frames",
 370                         aspect_w = 16,
 371                         aspect_h = 16,
 372                         length = 1,
 373                 }
 374         }},
 375         selection_box = {
 376                 type = "fixed",
 377                 fixed = {-1/2, -1/2, -1/2, 1/2, -1/2+1/16, 1/2},
 378         },
 379         drop = "",
 380         groups = {dig_immediate = 2, attached_node = 1, connect_to_raillike = minetest.raillike_group("gunpowder")},
 381         sounds = default.node_sound_leaves_defaults(),
 382         on_timer = function(pos, elapsed)
 383                 for dx = -1, 1 do
 384                 for dz = -1, 1 do
 385                 for dy = -1, 1 do
 386                         if not (dx == 0 and dz == 0) then
 387                                 tnt.burn({
 388                                         x = pos.x + dx,
 389                                         y = pos.y + dy,
 390                                         z = pos.z + dz,
 391                                 })
 392                         end
 393                 end
 394                 end
 395                 end
 396                 minetest.remove_node(pos)
 397         end,
 398         -- unaffected by explosions
 399         on_blast = function() end,
 400         on_construct = function(pos)
 401                 minetest.sound_play("tnt_gunpowder_burning", {pos = pos, gain = 2})
 402                 minetest.get_node_timer(pos):start(1)
 403         end,
 404 })
 405
 406 minetest.register_abm({
 407         nodenames = {"group:tnt", "tnt:gunpowder"},
 408         neighbors = {"fire:basic_flame", "default:lava_source", "default:lava_flowing"},
 409         interval = 4,
 410         chance = 1,
 411         action = tnt.burn,
 412 })
 413
 414 minetest.register_craft({
 415         output = "tnt:gunpowder",
 416         type = "shapeless",
 417         recipe = {"default:coal_lump", "default:gravel"}
 418 })
 419
 420 minetest.register_craft({
 421         output = "tnt:tnt",
 422         recipe = {
 423                 {"",           "group:wood",    ""},
 424                 {"group:wood", "tnt:gunpowder", "group:wood"},
 425                 {"",           "group:wood",    ""}
 426         }
 427 })
 428
 429 function tnt.register_tnt(def)
 430         local name = ""
 431         if not def.name:find(':') then
 432                 name = "tnt:" .. def.name
 433         else
 434                 name = def.name
 435                 def.name = def.name:match(":([%w_]+)")
 436         end
 437         if not def.tiles then def.tiles = {} end
 438         local tnt_top = def.tiles.top or def.name .. "_top.png"
 439         local tnt_bottom = def.tiles.bottom or def.name .. "_bottom.png"
 440         local tnt_side = def.tiles.side or def.name .. "_side.png"
 441         local tnt_burning = def.tiles.burning or def.name .. "_top_burning_animated.png"
 442         if not def.damage_radius then def.damage_radius = def.radius * 2 end
 443
 444         minetest.register_node(":" .. name, {
 445                 description = def.description,
 446                 tiles = {tnt_top, tnt_bottom, tnt_side},
 447                 is_ground_content = false,
 448                 groups = {dig_immediate = 2, mesecon = 2, tnt = 1},
 449                 sounds = default.node_sound_wood_defaults(),
 450                 on_punch = function(pos, node, puncher)
 451                         if puncher:get_wielded_item():get_name() == "default:torch" then
 452                                 minetest.set_node(pos, {name = name .. "_burning"})
 453                         end
 454                 end,
 455                 on_blast = function(pos, intensity)
 456                         minetest.after(0.1, function()
 457                                 tnt.boom(pos, def)
 458                         end)
 459                 end,
 460                 mesecons = {effector =
 461                         {action_on =
 462                                 function(pos)
 463                                         tnt.boom(pos, def)
 464                                 end
 465                         }
 466                 },
 467         })
 468
 469         minetest.register_node(":" .. name .. "_burning", {
 470                 tiles = {
 471                         {
 472                                 name = tnt_burning,
 473                                 animation = {
 474                                         type = "vertical_frames",
 475                                         aspect_w = 16,
 476                                         aspect_h = 16,
 477                                         length = 1,
 478                                 }
 479                         },
 480                         tnt_bottom, tnt_side
 481                         },
 482                 light_source = 5,
 483                 drop = "",
 484                 sounds = default.node_sound_wood_defaults(),
 485                 on_timer = function(pos, elapsed)
 486                         tnt.boom(pos, def)
 487                 end,
 488                 -- unaffected by explosions
 489                 on_blast = function() end,
 490                 on_construct = function(pos)
 491                         minetest.sound_play("tnt_ignite", {pos = pos})
 492                         minetest.get_node_timer(pos):start(4)
 493                 end,
 494         })
 495 end
 496
 497 tnt.register_tnt({
 498         name = "tnt:tnt",
 499         description = "TNT",
 500         radius = radius,
 501 })
 502