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