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