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