forked from VoxeLibre/VoxeLibre
458 lines
13 KiB
Lua
458 lines
13 KiB
Lua
-- Parameters
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local TCAVE = 0.6
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local nobj_cave = nil
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-- Portal frame sizes
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local FRAME_SIZE_X_MIN = 4
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local FRAME_SIZE_Y_MIN = 5
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local FRAME_SIZE_X_MAX = 23
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local FRAME_SIZE_Y_MAX = 23
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-- 3D noise
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local np_cave = {
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offset = 0,
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scale = 1,
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spread = {x = 384, y = 128, z = 384},
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seed = 59033,
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octaves = 5,
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persist = 0.7
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}
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-- Table of objects (including players) which recently teleported by a
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-- Nether portal. Those objects have a brief cooloff period before they
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-- can teleport again. This prevents annoying back-and-forth teleportation.
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local portal_cooloff = {}
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-- Destroy portal if pos (portal frame or portal node) got destroyed
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local destroy_portal = function(pos)
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-- Deactivate Nether portal
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local meta = minetest.get_meta(pos)
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local p1 = minetest.string_to_pos(meta:get_string("portal_frame1"))
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local p2 = minetest.string_to_pos(meta:get_string("portal_frame2"))
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if not p1 or not p2 then
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return
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end
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local counter = 1
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local mp1
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for x = p1.x, p2.x do
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for y = p1.y, p2.y do
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for z = p1.z, p2.z do
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local p = vector.new(x, y, z)
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local m = minetest.get_meta(p)
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if counter == 2 then
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--[[ Only proceed if the second node still has metadata.
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(first node is a corner and not needed for the portal)
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If it doesn't have metadata, another node propably triggred the delection
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routine earlier, so we bail out earlier to avoid an infinite cascade
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of on_destroy events. ]]
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mp1 = minetest.string_to_pos(m:get_string("portal_frame1"))
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if not mp1 then
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return
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end
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end
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local nn = minetest.get_node(p).name
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if nn == "mcl_core:obsidian" or nn == "mcl_portals:portal" then
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-- Remove portal nodes, but not myself
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if nn == "mcl_portals:portal" and not vector.equals(p, pos) then
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minetest.remove_node(p)
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end
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-- Clear metadata of portal nodes and the frame
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m:set_string("portal_frame1", "")
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m:set_string("portal_frame2", "")
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m:set_string("portal_target", "")
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end
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counter = counter + 1
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end
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end
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end
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end
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minetest.register_node("mcl_portals:portal", {
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description = "Nether Portal",
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_doc_items_longdesc = "A Nether portal teleports creatures and objects to the hot and dangerous Nether dimension (and back!). Enter at your own risk!",
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_doc_items_usagehelp = "Stand in the portal for a moment to activate the teleportation. Entering a Nether portal for the first time will also create a new portal in the other dimension. If a Nether portal has been built in the Nether, it will lead to the Overworld. A Nether portal is destroyed if the any of the obsidian which surrounds it is destroyed, or if it was caught in an explosion.",
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tiles = {
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"blank.png",
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"blank.png",
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"blank.png",
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"blank.png",
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{
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name = "mcl_portals_portal.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 0.5,
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},
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},
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{
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name = "mcl_portals_portal.png",
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animation = {
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type = "vertical_frames",
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aspect_w = 16,
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aspect_h = 16,
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length = 0.5,
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},
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},
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},
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drawtype = "nodebox",
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paramtype = "light",
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paramtype2 = "facedir",
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sunlight_propagates = true,
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use_texture_alpha = true,
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walkable = false,
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diggable = false,
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pointable = false,
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buildable_to = false,
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is_ground_content = false,
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drop = "",
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light_source = 11,
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post_effect_color = {a = 180, r = 51, g = 7, b = 89},
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alpha = 192,
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node_box = {
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type = "fixed",
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fixed = {
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{-0.5, -0.5, -0.1, 0.5, 0.5, 0.1},
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},
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},
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groups = {not_in_creative_inventory = 1},
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on_destruct = destroy_portal,
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_mcl_hardness = -1,
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_mcl_blast_resistance = 0,
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})
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-- Functions
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--Build arrival portal
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local function build_portal(pos, target, is_rebuilding)
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local p = {x = pos.x - 1, y = pos.y - 1, z = pos.z}
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local p1 = {x = pos.x - 1, y = pos.y - 1, z = pos.z}
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local p2 = {x = p1.x + 3, y = p1.y + 4, z = p1.z}
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for i = 1, FRAME_SIZE_Y_MIN - 1 do
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minetest.set_node(p, {name = "mcl_core:obsidian"})
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p.y = p.y + 1
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end
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for i = 1, FRAME_SIZE_X_MIN - 1 do
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minetest.set_node(p, {name = "mcl_core:obsidian"})
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p.x = p.x + 1
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end
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for i = 1, FRAME_SIZE_Y_MIN - 1 do
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minetest.set_node(p, {name = "mcl_core:obsidian"})
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p.y = p.y - 1
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end
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for i = 1, FRAME_SIZE_X_MIN - 1 do
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minetest.set_node(p, {name = "mcl_core:obsidian"})
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p.x = p.x - 1
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end
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for x = p1.x, p2.x do
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for y = p1.y, p2.y do
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p = {x = x, y = y, z = p1.z}
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if not ((x == p1.x or x == p2.x) and (y == p1.y or y == p2.y)) then
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if not (x == p1.x or x == p2.x or y == p1.y or y == p2.y) then
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minetest.set_node(p, {name = "mcl_portals:portal", param2 = 0})
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end
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local meta = minetest.get_meta(p)
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meta:set_string("portal_frame1", minetest.pos_to_string(p1))
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meta:set_string("portal_frame2", minetest.pos_to_string(p2))
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meta:set_string("portal_target", minetest.pos_to_string(target))
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end
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if y ~= p1.y and not is_rebuilding then
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for z = -2, 2 do
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if z ~= 0 then
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p.z = p.z + z
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if minetest.registered_nodes[
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minetest.get_node(p).name].is_ground_content then
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minetest.remove_node(p)
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end
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p.z = p.z - z
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end
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end
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end
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end
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end
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end
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local function find_nether_target_y(target_x, target_z)
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local start_y = mcl_vars.mg_nether_min + math.random(38, 117) -- Search start
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if not nobj_cave then
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nobj_cave = minetest.get_perlin(np_cave)
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end
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local air = 4
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for y = start_y, start_y -117, -1 do
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local nval_cave = nobj_cave:get3d({x = target_x, y = y, z = target_z})
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if nval_cave > TCAVE then -- Cavern
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air = air + 1
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else -- Not cavern, check if 4 nodes of space above
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if air >= 4 then
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return y + 2
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else -- Not enough space, reset air to zero
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air = 0
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end
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end
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end
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return start_y -- Fallback
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end
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local function move_check(p1, max, dir)
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local p = {x = p1.x, y = p1.y, z = p1.z}
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local d = math.sign(max - p1[dir])
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local min = p[dir]
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for k = min, max, d do
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p[dir] = k
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local node = minetest.get_node(p)
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-- Check for obsidian (except at corners)
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if k ~= min and k ~= max and node.name ~= "mcl_core:obsidian" then
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return false
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end
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-- Abort if any of the portal frame blocks already has metadata.
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-- This mod does not yet portals which neighbor each other directly.
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-- TODO: Reorganize the way how portal frame coordinates are stored.
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if node.name == "mcl_core:obsidian" then
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local meta = minetest.get_meta(p)
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local pframe1 = meta:get_string("portal_frame1")
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if minetest.string_to_pos(pframe1) ~= nil then
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return false
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end
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end
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end
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return true
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end
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local function check_portal(p1, p2)
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if p1.x ~= p2.x then
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if not move_check(p1, p2.x, "x") then
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return false
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end
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if not move_check(p2, p1.x, "x") then
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return false
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end
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elseif p1.z ~= p2.z then
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if not move_check(p1, p2.z, "z") then
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return false
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end
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if not move_check(p2, p1.z, "z") then
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return false
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end
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else
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return false
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end
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if not move_check(p1, p2.y, "y") then
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return false
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end
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if not move_check(p2, p1.y, "y") then
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return false
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end
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return true
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end
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local function is_portal(pos)
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local xsize, ysize = FRAME_SIZE_X_MIN-1, FRAME_SIZE_Y_MIN-1
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for d = -xsize, xsize do
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for y = -ysize, ysize do
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local px = {x = pos.x + d, y = pos.y + y, z = pos.z}
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local pz = {x = pos.x, y = pos.y + y, z = pos.z + d}
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if check_portal(px, {x = px.x + xsize, y = px.y + ysize, z = px.z}) then
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return px, {x = px.x + xsize, y = px.y + ysize, z = px.z}
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end
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if check_portal(pz, {x = pz.x, y = pz.y + ysize, z = pz.z + xsize}) then
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return pz, {x = pz.x, y = pz.y + ysize, z = pz.z + xsize}
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end
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end
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end
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end
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local function make_portal(pos)
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local p1, p2 = is_portal(pos)
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if not p1 or not p2 then
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return false
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end
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for d = 1, 2 do
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for y = p1.y + 1, p2.y - 1 do
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local p
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if p1.z == p2.z then
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p = {x = p1.x + d, y = y, z = p1.z}
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else
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p = {x = p1.x, y = y, z = p1.z + d}
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end
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if minetest.get_node(p).name ~= "air" then
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return false
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end
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end
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end
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local param2
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if p1.z == p2.z then
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param2 = 0
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else
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param2 = 1
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end
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local target = {x = p1.x, y = p1.y, z = p1.z}
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target.x = target.x + 1
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if target.y < mcl_vars.mg_nether_max and target.y > mcl_vars.mg_nether_min then
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target.y = math.random(mcl_vars.mg_overworld_min + 40, mcl_vars.mg_overworld_min + 96)
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else
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target.y = find_nether_target_y(target.x, target.z)
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end
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local dmin, dmax, ymin, ymax = 0, FRAME_SIZE_X_MIN - 1, p1.y, p2.y
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for d = dmin, dmax do
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for y = ymin, ymax do
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if not ((d == dmin or d == dmax) and (y == ymin or y == ymax)) then
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local p
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if param2 == 0 then
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p = {x = p1.x + d, y = y, z = p1.z}
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else
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p = {x = p1.x, y = y, z = p1.z + d}
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end
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if minetest.get_node(p).name == "air" then
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minetest.set_node(p, {name = "mcl_portals:portal", param2 = param2})
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end
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local meta = minetest.get_meta(p)
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-- Portal frame corners
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meta:set_string("portal_frame1", minetest.pos_to_string(p1))
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meta:set_string("portal_frame2", minetest.pos_to_string(p2))
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-- Portal target coordinates
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meta:set_string("portal_target", minetest.pos_to_string(target))
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end
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end
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end
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return true
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end
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minetest.register_abm({
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label = "Nether portal teleportation and particles",
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nodenames = {"mcl_portals:portal"},
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interval = 1,
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chance = 2,
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action = function(pos, node)
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minetest.add_particlespawner(
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32, --amount
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4, --time
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{x = pos.x - 0.25, y = pos.y - 0.25, z = pos.z - 0.25}, --minpos
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{x = pos.x + 0.25, y = pos.y + 0.25, z = pos.z + 0.25}, --maxpos
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{x = -0.8, y = -0.8, z = -0.8}, --minvel
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{x = 0.8, y = 0.8, z = 0.8}, --maxvel
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{x = 0, y = 0, z = 0}, --minacc
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{x = 0, y = 0, z = 0}, --maxacc
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0.5, --minexptime
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1, --maxexptime
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1, --minsize
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2, --maxsize
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false, --collisiondetection
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"mcl_portals_particle.png" --texture
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)
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for _,obj in ipairs(minetest.get_objects_inside_radius(pos,1)) do --maikerumine added for objects to travel
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local lua_entity = obj:get_luaentity() --maikerumine added for objects to travel
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if obj:is_player() or lua_entity then
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-- Prevent quick back-and-forth teleportation
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if portal_cooloff[obj] then
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return
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end
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local meta = minetest.get_meta(pos)
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local target = minetest.string_to_pos(meta:get_string("portal_target"))
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if target then
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-- force emerge of target area
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minetest.get_voxel_manip():read_from_map(target, target)
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if not minetest.get_node_or_nil(target) then
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minetest.emerge_area(
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vector.subtract(target, 4), vector.add(target, 4))
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end
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-- teleport the object
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minetest.after(3, function(obj, pos, target)
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-- Prevent quick back-and-forth teleportation
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if portal_cooloff[obj] then
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return
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end
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local objpos = obj:getpos()
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if objpos == nil then
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return
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end
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-- If player stands, player is at ca. something+0.5
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-- which might cause precision problems, so we used ceil.
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objpos.y = math.ceil(objpos.y)
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if minetest.get_node(objpos).name ~= "mcl_portals:portal" then
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return
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end
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-- Build target portal
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local function check_and_build_portal(pos, target, is_rebuilding)
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-- FIXME: This is a horrible hack and a desparate attempt to make sure
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-- the portal has *really* been placed. Replace this hack!
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local n = minetest.get_node_or_nil(target)
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if n and n.name ~= "mcl_portals:portal" then
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build_portal(target, pos, is_rebuilding)
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is_rebuilding = true
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minetest.after(2, check_and_build_portal, pos, target, is_rebuilding)
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elseif not n then
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is_rebuilding = true
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minetest.after(1, check_and_build_portal, pos, target, is_rebuilding)
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end
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end
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check_and_build_portal(pos, target, false)
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-- Teleport
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obj:setpos(target)
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minetest.sound_play("mcl_portals_teleport", {pos=target, gain=0.5, max_hear_distance = 16})
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-- Enable teleportation cooloff for 4 seconds, to prevent back-and-forth teleportation
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portal_cooloff[obj] = true
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minetest.after(4, function(o)
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portal_cooloff[o] = false
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end, obj)
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end, obj, pos, target)
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end
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end
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end
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end,
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})
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--[[ ITEM OVERRIDES ]]
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local longdesc = minetest.registered_nodes["mcl_core:obsidian"]._doc_items_longdesc
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longdesc = longdesc .. "\n" .. "Obsidian is also used as the frame of Nether portals."
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local usagehelp = "To open a Nether portal, place an upright frame of obsidian with a width of 4 blocks and a height of 5 blocks, leaving only air in the center. After placing this frame, ignite the obsidian with an appropriate tool, such as flint of steel."
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minetest.override_item("mcl_core:obsidian", {
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_doc_items_longdesc = longdesc,
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_doc_items_usagehelp = usagehelp,
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on_destruct = destroy_portal,
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_on_ignite = function(user, pointed_thing)
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local pos = pointed_thing.under
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local portal_placed = make_portal(pos)
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if portal_placed and minetest.get_modpath("doc") then
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doc.mark_entry_as_revealed(user:get_player_name(), "nodes", "mcl_portals:portal")
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else
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local node = minetest.get_node(pointed_thing.above)
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if node.name ~= "mcl_portals:portal" then
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mcl_fire.set_fire(pointed_thing)
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end
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end
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end,
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})
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