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