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VoxeLibre/mods/ITEMS/mcl_portals/portal_nether.lua
Elias Fleckenstein 82e113f0fc Update usages of alpha to the 5.4 convention
2021-02-18 10:58:50 +01:00

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local S = minetest.get_translator("mcl_portals")
-- Parameters
local OVERWORLD_TO_NETHER_SCALE = 8
local LIMIT = math.min(math.abs(mcl_vars.mapgen_edge_min), math.abs(mcl_vars.mapgen_edge_max))
-- Portal frame sizes
local FRAME_SIZE_X_MIN = 4
local FRAME_SIZE_Y_MIN = 5
local FRAME_SIZE_X_MAX = 23
local FRAME_SIZE_Y_MAX = 23
local PORTAL_NODES_MIN = 5
local PORTAL_NODES_MAX = (FRAME_SIZE_X_MAX - 2) * (FRAME_SIZE_Y_MAX - 2)
local TELEPORT_COOLOFF = 3 -- after player was teleported, for this many seconds they won't teleported again
local MOB_TELEPORT_COOLOFF = 14 -- after mob was teleported, for this many seconds they won't teleported again
local TOUCH_CHATTER_TIME = 1 -- prevent multiple teleportation attempts caused by multiple portal touches, for this number of seconds
local TOUCH_CHATTER_TIME_US = TOUCH_CHATTER_TIME * 1000000
local TELEPORT_DELAY = 3 -- seconds before teleporting in Nether portal (4 minus ABM interval time)
local DESTINATION_EXPIRES = 60 * 1000000 -- cached destination expires after this number of microseconds have passed without using the same origin portal
local PORTAL_SEARCH_HALF_CHUNK = 40 -- greater values may slow down the teleportation
local PORTAL_SEARCH_ALTITUDE = 128
local PORTAL_ALPHA = 192
if minetest.features.use_texture_alpha_string_modes then
PORTAL_ALPHA = nil
end
-- Table of objects (including players) which recently teleported by a
-- Nether portal. Those objects have a brief cooloff period before they
-- can teleport again. This prevents annoying back-and-forth teleportation.
mcl_portals.nether_portal_cooloff = {}
local touch_chatter_prevention = {}
local overworld_ymin = math.max(mcl_vars.mg_overworld_min, -31)
local overworld_ymax = math.min(mcl_vars.mg_overworld_max_official, 63)
local nether_ymin = mcl_vars.mg_bedrock_nether_bottom_min
local nether_ymax = mcl_vars.mg_bedrock_nether_top_max
local overworld_dy = overworld_ymax - overworld_ymin + 1
local nether_dy = nether_ymax - nether_ymin + 1
local node_particles_allowed = minetest.settings:get("mcl_node_particles") or "none"
local node_particles_levels = {
high = 3,
medium = 2,
low = 1,
none = 0,
}
local node_particles_allowed_level = node_particles_levels[node_particles_allowed]
-- Functions
-- Ping-Pong fast travel, https://git.minetest.land/Wuzzy/MineClone2/issues/795#issuecomment-11058
local function nether_to_overworld(x)
return LIMIT - math.abs(((x * OVERWORLD_TO_NETHER_SCALE + LIMIT) % (LIMIT*4)) - (LIMIT*2))
end
-- Destroy portal if pos (portal frame or portal node) got destroyed
local function destroy_nether_portal(pos)
local meta = minetest.get_meta(pos)
local node = minetest.get_node(pos)
local nn, orientation = node.name, node.param2
local obsidian = nn == "mcl_core:obsidian"
local has_meta = minetest.string_to_pos(meta:get_string("portal_frame1"))
if has_meta then
meta:set_string("portal_frame1", "")
meta:set_string("portal_frame2", "")
meta:set_string("portal_target", "")
meta:set_string("portal_time", "")
end
local check_remove = function(pos, orientation)
local node = minetest.get_node(pos)
if node and (node.name == "mcl_portals:portal" and (orientation == nil or (node.param2 == orientation))) then
minetest.log("action", "[mcl_portal] Destroying Nether portal at " .. minetest.pos_to_string(pos))
return minetest.remove_node(pos)
end
end
if obsidian then -- check each of 6 sides of it and destroy every portal:
check_remove({x = pos.x - 1, y = pos.y, z = pos.z}, 0)
check_remove({x = pos.x + 1, y = pos.y, z = pos.z}, 0)
check_remove({x = pos.x, y = pos.y, z = pos.z - 1}, 1)
check_remove({x = pos.x, y = pos.y, z = pos.z + 1}, 1)
check_remove({x = pos.x, y = pos.y - 1, z = pos.z})
check_remove({x = pos.x, y = pos.y + 1, z = pos.z})
return
end
if not has_meta then -- no meta means repeated call: function calls on every node destruction
return
end
if orientation == 0 then
check_remove({x = pos.x - 1, y = pos.y, z = pos.z}, 0)
check_remove({x = pos.x + 1, y = pos.y, z = pos.z}, 0)
else
check_remove({x = pos.x, y = pos.y, z = pos.z - 1}, 1)
check_remove({x = pos.x, y = pos.y, z = pos.z + 1}, 1)
end
check_remove({x = pos.x, y = pos.y - 1, z = pos.z})
check_remove({x = pos.x, y = pos.y + 1, z = pos.z})
end
minetest.register_node("mcl_portals:portal", {
description = S("Nether Portal"),
_doc_items_longdesc = S("A Nether portal teleports creatures and objects to the hot and dangerous Nether dimension (and back!). Enter at your own risk!"),
_doc_items_usagehelp = S("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."),
tiles = {
"blank.png",
"blank.png",
"blank.png",
"blank.png",
{
name = "mcl_portals_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1.25,
},
},
{
name = "mcl_portals_portal.png",
animation = {
type = "vertical_frames",
aspect_w = 16,
aspect_h = 16,
length = 1.25,
},
},
},
drawtype = "nodebox",
paramtype = "light",
paramtype2 = "facedir",
sunlight_propagates = true,
use_texture_alpha = minetest.features.use_texture_alpha_string_modes and "blend" or true,
walkable = false,
diggable = false,
pointable = false,
buildable_to = false,
is_ground_content = false,
drop = "",
light_source = 11,
post_effect_color = {a = 180, r = 51, g = 7, b = 89},
alpha = PORTAL_ALPHA,
node_box = {
type = "fixed",
fixed = {
{-0.5, -0.5, -0.1, 0.5, 0.5, 0.1},
},
},
groups = {portal=1, not_in_creative_inventory = 1},
on_destruct = destroy_nether_portal,
_mcl_hardness = -1,
_mcl_blast_resistance = 0,
})
local function find_target_y(x, y, z, y_min, y_max)
local y_org = math.max(math.min(y, y_max), y_min)
local node = minetest.get_node_or_nil({x = x, y = y, z = z})
if node == nil then
return y_org
end
while node.name ~= "air" and y < y_max do
y = y + 1
node = minetest.get_node_or_nil({x = x, y = y, z = z})
if node == nil then
break
end
end
if node then
if node.name ~= "air" then
y = y_org
end
end
while node == nil and y > y_min do
y = y - 1
node = minetest.get_node_or_nil({x = x, y = y, z = z})
end
if y == y_max and node ~= nil then -- try reverse direction who knows what they built there...
while node.name ~= "air" and y > y_min do
y = y - 1
node = minetest.get_node_or_nil({x = x, y = y, z = z})
if node == nil then
break
end
end
end
if node == nil then
return y_org
end
while node.name == "air" and y > y_min do
y = y - 1
node = minetest.get_node_or_nil({x = x, y = y, z = z})
while node == nil and y > y_min do
y = y - 1
node = minetest.get_node_or_nil({x = x, y = y, z = z})
end
if node == nil then
return y_org
end
end
if y == y_min then
return y_org
end
return math.max(math.min(y, y_max), y_min)
end
local function find_nether_target_y(x, y, z)
local target_y = find_target_y(x, y, z, nether_ymin + 4, nether_ymax - 25) + 1
minetest.log("verbose", "[mcl_portal] Found Nether target altitude: " .. tostring(target_y) .. " for pos. " .. minetest.pos_to_string({x = x, y = y, z = z}))
return target_y
end
local function find_overworld_target_y(x, y, z)
local target_y = find_target_y(x, y, z, overworld_ymin + 4, overworld_ymax - 25) + 1
local node = minetest.get_node({x = x, y = target_y - 1, z = z})
if not node then
return target_y
end
local nn = node.name
if nn ~= "air" and minetest.get_item_group(nn, "water") == 0 then
target_y = target_y + 1
end
minetest.log("verbose", "[mcl_portal] Found Overworld target altitude: " .. tostring(target_y) .. " for pos. " .. minetest.pos_to_string({x = x, y = y, z = z}))
return target_y
end
local function update_target(pos, target, time_str)
local stack = {{x = pos.x, y = pos.y, z = pos.z}}
while #stack > 0 do
local i = #stack
local meta = minetest.get_meta(stack[i])
if meta:get_string("portal_time") == time_str then
stack[i] = nil -- Already updated, skip it
else
local node = minetest.get_node(stack[i])
local portal = node.name == "mcl_portals:portal"
if not portal then
stack[i] = nil
else
local x, y, z = stack[i].x, stack[i].y, stack[i].z
meta:set_string("portal_time", time_str)
meta:set_string("portal_target", target)
stack[i].y = y - 1
stack[i + 1] = {x = x, y = y + 1, z = z}
if node.param2 == 0 then
stack[i + 2] = {x = x - 1, y = y, z = z}
stack[i + 3] = {x = x + 1, y = y, z = z}
else
stack[i + 2] = {x = x, y = y, z = z - 1}
stack[i + 3] = {x = x, y = y, z = z + 1}
end
end
end
end
end
local function ecb_setup_target_portal(blockpos, action, calls_remaining, param)
-- param.: srcx, srcy, srcz, dstx, dsty, dstz, srcdim, ax1, ay1, az1, ax2, ay2, az2
local portal_search = function(target, p1, p2)
local portal_nodes = minetest.find_nodes_in_area(p1, p2, "mcl_portals:portal")
local portal_pos = false
if portal_nodes and #portal_nodes > 0 then
-- Found some portal(s), use nearest:
portal_pos = {x = portal_nodes[1].x, y = portal_nodes[1].y, z = portal_nodes[1].z}
local nearest_distance = vector.distance(target, portal_pos)
for n = 2, #portal_nodes do
local distance = vector.distance(target, portal_nodes[n])
if distance < nearest_distance then
portal_pos = {x = portal_nodes[n].x, y = portal_nodes[n].y, z = portal_nodes[n].z}
nearest_distance = distance
end
end
end -- here we have the best portal_pos
return portal_pos
end
if calls_remaining <= 0 then
minetest.log("action", "[mcl_portal] Area for destination Nether portal emerged!")
local src_pos = {x = param.srcx, y = param.srcy, z = param.srcz}
local dst_pos = {x = param.dstx, y = param.dsty, z = param.dstz}
local meta = minetest.get_meta(src_pos)
local portal_pos = portal_search(dst_pos, {x = param.ax1, y = param.ay1, z = param.az1}, {x = param.ax2, y = param.ay2, z = param.az2})
if portal_pos == false then
minetest.log("verbose", "[mcl_portal] No portal in area " .. minetest.pos_to_string({x = param.ax1, y = param.ay1, z = param.az1}) .. "-" .. minetest.pos_to_string({x = param.ax2, y = param.ay2, z = param.az2}))
-- Need to build arrival portal:
local org_dst_y = dst_pos.y
if param.srcdim == "overworld" then
dst_pos.y = find_nether_target_y(dst_pos.x, dst_pos.y, dst_pos.z)
else
dst_pos.y = find_overworld_target_y(dst_pos.x, dst_pos.y, dst_pos.z)
end
if math.abs(org_dst_y - dst_pos.y) >= PORTAL_SEARCH_ALTITUDE / 2 then
portal_pos = portal_search(dst_pos,
{x = dst_pos.x - PORTAL_SEARCH_HALF_CHUNK, y = math.floor(dst_pos.y - PORTAL_SEARCH_ALTITUDE / 2), z = dst_pos.z - PORTAL_SEARCH_HALF_CHUNK},
{x = dst_pos.x + PORTAL_SEARCH_HALF_CHUNK, y = math.ceil(dst_pos.y + PORTAL_SEARCH_ALTITUDE / 2), z = dst_pos.z + PORTAL_SEARCH_HALF_CHUNK}
)
end
if portal_pos == false then
minetest.log("verbose", "[mcl_portal] 2nd attempt: No portal in area " .. minetest.pos_to_string({x = dst_pos.x - PORTAL_SEARCH_HALF_CHUNK, y = math.floor(dst_pos.y - PORTAL_SEARCH_ALTITUDE / 2), z = dst_pos.z - PORTAL_SEARCH_HALF_CHUNK}) .. "-" .. minetest.pos_to_string({x = dst_pos.x + PORTAL_SEARCH_HALF_CHUNK, y = math.ceil(dst_pos.y + PORTAL_SEARCH_ALTITUDE / 2), z = dst_pos.z + PORTAL_SEARCH_HALF_CHUNK}))
local width, height = 2, 3
portal_pos = mcl_portals.build_nether_portal(dst_pos, width, height)
end
end
local target_meta = minetest.get_meta(portal_pos)
local p3 = minetest.string_to_pos(target_meta:get_string("portal_frame1"))
local p4 = minetest.string_to_pos(target_meta:get_string("portal_frame2"))
if p3 and p4 then
portal_pos = vector.divide(vector.add(p3, p4), 2.0)
portal_pos.y = math.min(p3.y, p4.y)
portal_pos = vector.round(portal_pos)
local node = minetest.get_node(portal_pos)
if node and node.name ~= "mcl_portals:portal" then
portal_pos = {x = p3.x, y = p3.y, z = p3.z}
if minetest.get_node(portal_pos).name == "mcl_core:obsidian" then
-- Old-version portal:
if p4.z == p3.z then
portal_pos = {x = p3.x + 1, y = p3.y + 1, z = p3.z}
else
portal_pos = {x = p3.x, y = p3.y + 1, z = p3.z + 1}
end
end
end
end
local time_str = tostring(minetest.get_us_time())
local target = minetest.pos_to_string(portal_pos)
update_target(src_pos, target, time_str)
end
end
local function nether_portal_get_target_position(src_pos)
local _, current_dimension = mcl_worlds.y_to_layer(src_pos.y)
local x, y, z, y_min, y_max = 0, 0, 0, 0, 0
if current_dimension == "nether" then
x = math.floor(nether_to_overworld(src_pos.x) + 0.5)
z = math.floor(nether_to_overworld(src_pos.z) + 0.5)
y = math.floor((math.min(math.max(src_pos.y, nether_ymin), nether_ymax) - nether_ymin) / nether_dy * overworld_dy + overworld_ymin + 0.5)
y_min = overworld_ymin
y_max = overworld_ymax
else -- overworld:
x = math.floor(src_pos.x / OVERWORLD_TO_NETHER_SCALE + 0.5)
z = math.floor(src_pos.z / OVERWORLD_TO_NETHER_SCALE + 0.5)
y = math.floor((math.min(math.max(src_pos.y, overworld_ymin), overworld_ymax) - overworld_ymin) / overworld_dy * nether_dy + nether_ymin + 0.5)
y_min = nether_ymin
y_max = nether_ymax
end
return x, y, z, current_dimension, y_min, y_max
end
local function find_or_create_portal(src_pos)
local x, y, z, cdim, y_min, y_max = nether_portal_get_target_position(src_pos)
local pos1 = {x = x - PORTAL_SEARCH_HALF_CHUNK, y = math.max(y_min, math.floor(y - PORTAL_SEARCH_ALTITUDE / 2)), z = z - PORTAL_SEARCH_HALF_CHUNK}
local pos2 = {x = x + PORTAL_SEARCH_HALF_CHUNK, y = math.min(y_max, math.ceil(y + PORTAL_SEARCH_ALTITUDE / 2)), z = z + PORTAL_SEARCH_HALF_CHUNK}
if pos1.y == y_min then
pos2.y = math.min(y_max, pos1.y + PORTAL_SEARCH_ALTITUDE)
else
if pos2.y == y_max then
pos1.y = math.max(y_min, pos2.y - PORTAL_SEARCH_ALTITUDE)
end
end
minetest.emerge_area(pos1, pos2, ecb_setup_target_portal, {srcx=src_pos.x, srcy=src_pos.y, srcz=src_pos.z, dstx=x, dsty=y, dstz=z, srcdim=cdim, ax1=pos1.x, ay1=pos1.y, az1=pos1.z, ax2=pos2.x, ay2=pos2.y, az2=pos2.z})
end
local function emerge_target_area(src_pos)
local x, y, z, cdim, y_min, y_max = nether_portal_get_target_position(src_pos)
local pos1 = {x = x - PORTAL_SEARCH_HALF_CHUNK, y = math.max(y_min + 2, math.floor(y - PORTAL_SEARCH_ALTITUDE / 2)), z = z - PORTAL_SEARCH_HALF_CHUNK}
local pos2 = {x = x + PORTAL_SEARCH_HALF_CHUNK, y = math.min(y_max - 2, math.ceil(y + PORTAL_SEARCH_ALTITUDE / 2)), z = z + PORTAL_SEARCH_HALF_CHUNK}
minetest.emerge_area(pos1, pos2)
pos1 = {x = x - 1, y = y_min, z = z - 1}
pos2 = {x = x + 1, y = y_max, z = z + 1}
minetest.emerge_area(pos1, pos2)
end
local function available_for_nether_portal(p)
local nn = minetest.get_node(p).name
local obsidian = nn == "mcl_core:obsidian"
if nn ~= "air" and minetest.get_item_group(nn, "fire") ~= 1 then
return false, obsidian
end
return true, obsidian
end
local function light_frame(x1, y1, z1, x2, y2, z2, build_frame)
local build_frame = build_frame or false
local orientation = 0
if x1 == x2 then
orientation = 1
end
local disperse = 50
local pass = 1
while true do
local protection = false
for x = x1 - 1 + orientation, x2 + 1 - orientation do
for z = z1 - orientation, z2 + orientation do
for y = y1 - 1, y2 + 1 do
local frame = (x < x1) or (x > x2) or (y < y1) or (y > y2) or (z < z1) or (z > z2)
if frame then
if build_frame then
if pass == 1 then
if minetest.is_protected({x = x, y = y, z = z}, "") then
protection = true
local offset_x = math.random(-disperse, disperse)
local offset_z = math.random(-disperse, disperse)
disperse = disperse + math.random(25, 177)
if disperse > 5000 then
return nil
end
x1, z1 = x1 + offset_x, z1 + offset_z
x2, z2 = x2 + offset_x, z2 + offset_z
local _, dimension = mcl_worlds.y_to_layer(y1)
local height = math.abs(y2 - y1)
y1 = (y1 + y2) / 2
if dimension == "nether" then
y1 = find_nether_target_y(math.min(x1, x2), y1, math.min(z1, z2))
else
y1 = find_overworld_target_y(math.min(x1, x2), y1, math.min(z1, z2))
end
y2 = y1 + height
break
end
else
minetest.set_node({x = x, y = y, z = z}, {name = "mcl_core:obsidian"})
end
end
else
if not build_frame or pass == 2 then
local node = minetest.get_node({x = x, y = y, z = z})
minetest.set_node({x = x, y = y, z = z}, {name = "mcl_portals:portal", param2 = orientation})
end
end
if not frame and pass == 2 then
local meta = minetest.get_meta({x = x, y = y, z = z})
-- Portal frame corners
meta:set_string("portal_frame1", minetest.pos_to_string({x = x1, y = y1, z = z1}))
meta:set_string("portal_frame2", minetest.pos_to_string({x = x2, y = y2, z = z2}))
-- Portal target coordinates
meta:set_string("portal_target", "")
-- Portal last teleportation time
meta:set_string("portal_time", tostring(0))
end
end
if protection then
break
end
end
if protection then
break
end
end
if build_frame == false or pass == 2 then
break
end
if build_frame and not protection and pass == 1 then
pass = 2
end
end
emerge_target_area({x = x1, y = y1, z = z1})
return {x = x1, y = y1, z = z1}
end
--Build arrival portal
function mcl_portals.build_nether_portal(pos, width, height, orientation)
local height = height or FRAME_SIZE_Y_MIN - 2
local width = width or FRAME_SIZE_X_MIN - 2
local orientation = orientation or math.random(0, 1)
if orientation == 0 then
minetest.load_area({x = pos.x - 3, y = pos.y - 1, z = pos.z - width * 2}, {x = pos.x + width + 2, y = pos.y + height + 2, z = pos.z + width * 2})
else
minetest.load_area({x = pos.x - width * 2, y = pos.y - 1, z = pos.z - 3}, {x = pos.x + width * 2, y = pos.y + height + 2, z = pos.z + width + 2})
end
pos = light_frame(pos.x, pos.y, pos.z, pos.x + (1 - orientation) * (width - 1), pos.y + height - 1, pos.z + orientation * (width - 1), true)
-- Clear some space around:
for x = pos.x - math.random(2 + (width-2)*( orientation), 5 + (2*width-5)*( orientation)), pos.x + width*(1-orientation) + math.random(2+(width-2)*( orientation), 4 + (2*width-4)*( orientation)) do
for z = pos.z - math.random(2 + (width-2)*(1-orientation), 5 + (2*width-5)*(1-orientation)), pos.z + width*( orientation) + math.random(2+(width-2)*(1-orientation), 4 + (2*width-4)*(1-orientation)) do
for y = pos.y - 1, pos.y + height + math.random(1,6) do
local nn = minetest.get_node({x = x, y = y, z = z}).name
if nn ~= "mcl_core:obsidian" and nn ~= "mcl_portals:portal" and minetest.registered_nodes[nn].is_ground_content and not minetest.is_protected({x = x, y = y, z = z}, "") then
minetest.remove_node({x = x, y = y, z = z})
end
end
end
end
-- Build obsidian platform:
for x = pos.x - orientation, pos.x + orientation + (width - 1) * (1 - orientation), 1 + orientation do
for z = pos.z - 1 + orientation, pos.z + 1 - orientation + (width - 1) * orientation, 2 - orientation do
local pp = {x = x, y = pos.y - 1, z = z}
local nn = minetest.get_node(pp).name
if not minetest.registered_nodes[nn].is_ground_content and not minetest.is_protected(pp, "") then
minetest.set_node(pp, {name = "mcl_core:obsidian"})
end
end
end
minetest.log("action", "[mcl_portal] Destination Nether portal generated at "..minetest.pos_to_string(pos).."!")
return pos
end
local function check_and_light_shape(pos, orientation)
local stack = {{x = pos.x, y = pos.y, z = pos.z}}
local node_list = {}
local node_counter = 0
-- Search most low node from the left (pos1) and most right node from the top (pos2)
local pos1 = {x = pos.x, y = pos.y, z = pos.z}
local pos2 = {x = pos.x, y = pos.y, z = pos.z}
local wrong_portal_nodes_clean_up = function(node_list)
for i = 1, #node_list do
local meta = minetest.get_meta(node_list[i])
meta:set_string("portal_time", "")
end
return false
end
while #stack > 0 do
local i = #stack
local meta = minetest.get_meta(stack[i])
local target = meta:get_string("portal_time")
if target and target == "-2" then
stack[i] = nil -- Already checked, skip it
else
local good, obsidian = available_for_nether_portal(stack[i])
if obsidian then
stack[i] = nil
else
if (not good) or (node_counter >= PORTAL_NODES_MAX) then
return wrong_portal_nodes_clean_up(node_list)
end
local x, y, z = stack[i].x, stack[i].y, stack[i].z
meta:set_string("portal_time", "-2")
node_counter = node_counter + 1
node_list[node_counter] = {x = x, y = y, z = z}
stack[i].y = y - 1
stack[i + 1] = {x = x, y = y + 1, z = z}
if orientation == 0 then
stack[i + 2] = {x = x - 1, y = y, z = z}
stack[i + 3] = {x = x + 1, y = y, z = z}
else
stack[i + 2] = {x = x, y = y, z = z - 1}
stack[i + 3] = {x = x, y = y, z = z + 1}
end
if (y < pos1.y) or (y == pos1.y and (x < pos1.x or z < pos1.z)) then
pos1 = {x = x, y = y, z = z}
end
if (x > pos2.x or z > pos2.z) or (x == pos2.x and z == pos2.z and y > pos2.y) then
pos2 = {x = x, y = y, z = z}
end
end
end
end
if node_counter < PORTAL_NODES_MIN then
return wrong_portal_nodes_clean_up(node_list)
end
-- Limit rectangles width and height
if math.abs(pos2.x - pos1.x + pos2.z - pos1.z) + 3 > FRAME_SIZE_X_MAX or math.abs(pos2.y - pos1.y) + 3 > FRAME_SIZE_Y_MAX then
return wrong_portal_nodes_clean_up(node_list)
end
for i = 1, node_counter do
local node_pos = node_list[i]
local node = minetest.get_node(node_pos)
minetest.set_node(node_pos, {name = "mcl_portals:portal", param2 = orientation})
local meta = minetest.get_meta(node_pos)
meta:set_string("portal_frame1", minetest.pos_to_string(pos1))
meta:set_string("portal_frame2", minetest.pos_to_string(pos2))
meta:set_string("portal_time", tostring(0))
meta:set_string("portal_target", "")
end
return true
end
-- Attempts to light a Nether portal at pos
-- Pos can be any of the inner part.
-- The frame MUST be filled only with air or any fire, which will be replaced with Nether portal blocks.
-- If no Nether portal can be lit, nothing happens.
-- Returns number of portals created (0, 1 or 2)
function mcl_portals.light_nether_portal(pos)
-- Only allow to make portals in Overworld and Nether
local dim = mcl_worlds.pos_to_dimension(pos)
if dim ~= "overworld" and dim ~= "nether" then
return 0
end
local orientation = math.random(0, 1)
for orientation_iteration = 1, 2 do
if check_and_light_shape(pos, orientation) then
return true
end
orientation = 1 - orientation
end
return false
end
local function update_portal_time(pos, time_str)
local stack = {{x = pos.x, y = pos.y, z = pos.z}}
while #stack > 0 do
local i = #stack
local meta = minetest.get_meta(stack[i])
if meta:get_string("portal_time") == time_str then
stack[i] = nil -- Already updated, skip it
else
local node = minetest.get_node(stack[i])
local portal = node.name == "mcl_portals:portal"
if not portal then
stack[i] = nil
else
local x, y, z = stack[i].x, stack[i].y, stack[i].z
meta:set_string("portal_time", time_str)
stack[i].y = y - 1
stack[i + 1] = {x = x, y = y + 1, z = z}
if node.param2 == 0 then
stack[i + 2] = {x = x - 1, y = y, z = z}
stack[i + 3] = {x = x + 1, y = y, z = z}
else
stack[i + 2] = {x = x, y = y, z = z - 1}
stack[i + 3] = {x = x, y = y, z = z + 1}
end
end
end
end
end
local function prepare_target(pos)
local meta, us_time = minetest.get_meta(pos), minetest.get_us_time()
local portal_time = tonumber(meta:get_string("portal_time")) or 0
local delta_time_us = us_time - portal_time
local pos1, pos2 = minetest.string_to_pos(meta:get_string("portal_frame1")), minetest.string_to_pos(meta:get_string("portal_frame2"))
if delta_time_us <= DESTINATION_EXPIRES then
-- Destination point must be still cached according to https://minecraft.gamepedia.com/Nether_portal
return update_portal_time(pos, tostring(us_time))
end
-- No cached destination point
find_or_create_portal(pos)
end
-- Teleportation cooloff for some seconds, to prevent back-and-forth teleportation
local function stop_teleport_cooloff(o)
mcl_portals.nether_portal_cooloff[o] = false
touch_chatter_prevention[o] = nil
end
local function teleport_cooloff(obj)
if obj:is_player() then
minetest.after(TELEPORT_COOLOFF, stop_teleport_cooloff, obj)
else
minetest.after(MOB_TELEPORT_COOLOFF, stop_teleport_cooloff, obj)
end
end
-- Teleport function
local function teleport_no_delay(obj, pos)
local is_player = obj:is_player()
if (not obj:get_luaentity()) and (not is_player) then
return
end
local objpos = obj:get_pos()
if objpos == nil then
return
end
if mcl_portals.nether_portal_cooloff[obj] then
return
end
-- If player stands, player is at ca. something+0.5
-- which might cause precision problems, so we used ceil.
objpos.y = math.ceil(objpos.y)
if minetest.get_node(objpos).name ~= "mcl_portals:portal" then
return
end
local meta = minetest.get_meta(pos)
local delta_time = minetest.get_us_time() - (tonumber(meta:get_string("portal_time")) or 0)
local target = minetest.string_to_pos(meta:get_string("portal_target"))
if delta_time > DESTINATION_EXPIRES or target == nil then
-- Area not ready yet - retry after a second
return minetest.after(1, teleport_no_delay, obj, pos)
end
-- Enable teleportation cooloff for some seconds, to prevent back-and-forth teleportation
teleport_cooloff(obj)
mcl_portals.nether_portal_cooloff[obj] = true
-- Teleport
obj:set_pos(target)
if is_player then
mcl_worlds.dimension_change(obj, mcl_worlds.pos_to_dimension(target))
minetest.sound_play("mcl_portals_teleport", {pos=target, gain=0.5, max_hear_distance = 16}, true)
local name = obj:get_player_name()
minetest.log("action", "[mcl_portal] "..name.." teleported to Nether portal at "..minetest.pos_to_string(target)..".")
end
end
local function prevent_portal_chatter(obj)
local time_us = minetest.get_us_time()
local chatter = touch_chatter_prevention[obj] or 0
touch_chatter_prevention[obj] = time_us
minetest.after(TOUCH_CHATTER_TIME, function(o)
if not o or not touch_chatter_prevention[o] then
return
end
if minetest.get_us_time() - touch_chatter_prevention[o] >= TOUCH_CHATTER_TIME_US then
touch_chatter_prevention[o] = nil
end
end, obj)
return time_us - chatter > TOUCH_CHATTER_TIME_US
end
local function animation(player, playername)
local chatter = touch_chatter_prevention[player] or 0
if mcl_portals.nether_portal_cooloff[player] or minetest.get_us_time() - chatter < TOUCH_CHATTER_TIME_US then
local pos = player:get_pos()
if not pos then
return
end
minetest.add_particlespawner({
amount = 1,
minpos = {x = pos.x - 0.1, y = pos.y + 1.4, z = pos.z - 0.1},
maxpos = {x = pos.x + 0.1, y = pos.y + 1.6, z = pos.z + 0.1},
minvel = 0,
maxvel = 0,
minacc = 0,
maxacc = 0,
minexptime = 0.1,
maxexptime = 0.2,
minsize = 5,
maxsize = 15,
collisiondetection = false,
texture = "mcl_particles_nether_portal_t.png",
playername = playername,
})
minetest.after(0.3, animation, player, playername)
end
end
local function teleport(obj, portal_pos)
local name = ""
if obj:is_player() then
name = obj:get_player_name()
animation(obj, name)
end
-- Call prepare_target() first because it might take a long
prepare_target(portal_pos)
-- Prevent quick back-and-forth teleportation
if not mcl_portals.nether_portal_cooloff[obj] then
local creative_enabled = minetest.is_creative_enabled(name)
if creative_enabled then
return teleport_no_delay(obj, portal_pos)
end
minetest.after(TELEPORT_DELAY, teleport_no_delay, obj, portal_pos)
end
end
minetest.register_abm({
label = "Nether portal teleportation and particles",
nodenames = {"mcl_portals:portal"},
interval = 1,
chance = 1,
action = function(pos, node)
local o = node.param2 -- orientation
local d = math.random(0, 1) -- direction
local time = math.random() * 1.9 + 0.5
local velocity, acceleration
if o == 1 then
velocity = {x = math.random() * 0.7 + 0.3, y = math.random() - 0.5, z = math.random() - 0.5}
acceleration = {x = math.random() * 1.1 + 0.3, y = math.random() - 0.5, z = math.random() - 0.5}
else
velocity = {x = math.random() - 0.5, y = math.random() - 0.5, z = math.random() * 0.7 + 0.3}
acceleration = {x = math.random() - 0.5, y = math.random() - 0.5, z = math.random() * 1.1 + 0.3}
end
local distance = vector.add(vector.multiply(velocity, time), vector.multiply(acceleration, time * time / 2))
if d == 1 then
if o == 1 then
distance.x = -distance.x
velocity.x = -velocity.x
acceleration.x = -acceleration.x
else
distance.z = -distance.z
velocity.z = -velocity.z
acceleration.z = -acceleration.z
end
end
distance = vector.subtract(pos, distance)
for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 15)) do
if obj:is_player() then
minetest.add_particlespawner({
amount = node_particles_allowed_level + 1,
minpos = distance,
maxpos = distance,
minvel = velocity,
maxvel = velocity,
minacc = acceleration,
maxacc = acceleration,
minexptime = time,
maxexptime = time,
minsize = 0.3,
maxsize = 1.8,
collisiondetection = false,
texture = "mcl_particles_nether_portal.png",
playername = obj:get_player_name(),
})
end
end
for _, obj in ipairs(minetest.get_objects_inside_radius(pos, 1)) do --maikerumine added for objects to travel
local lua_entity = obj:get_luaentity() --maikerumine added for objects to travel
if (obj:is_player() or lua_entity) and prevent_portal_chatter(obj) then
teleport(obj, pos)
end
end
end,
})
--[[ ITEM OVERRIDES ]]
local longdesc = minetest.registered_nodes["mcl_core:obsidian"]._doc_items_longdesc
longdesc = longdesc .. "\n" .. S("Obsidian is also used as the frame of Nether portals.")
local usagehelp = S("To open a Nether portal, place an upright frame of obsidian with a width of at least 4 blocks and a height of 5 blocks, leaving only air in the center. After placing this frame, light a fire in the obsidian frame. Nether portals only work in the Overworld and the Nether.")
minetest.override_item("mcl_core:obsidian", {
_doc_items_longdesc = longdesc,
_doc_items_usagehelp = usagehelp,
on_destruct = destroy_nether_portal,
_on_ignite = function(user, pointed_thing)
local x, y, z = pointed_thing.under.x, pointed_thing.under.y, pointed_thing.under.z
-- Check empty spaces around obsidian and light all frames found:
local portals_placed =
mcl_portals.light_nether_portal({x = x - 1, y = y, z = z}) or mcl_portals.light_nether_portal({x = x + 1, y = y, z = z}) or
mcl_portals.light_nether_portal({x = x, y = y - 1, z = z}) or mcl_portals.light_nether_portal({x = x, y = y + 1, z = z}) or
mcl_portals.light_nether_portal({x = x, y = y, z = z - 1}) or mcl_portals.light_nether_portal({x = x, y = y, z = z + 1})
if portals_placed then
minetest.log("action", "[mcl_portal] Nether portal activated at "..minetest.pos_to_string({x=x,y=y,z=z})..".")
if minetest.get_modpath("doc") then
doc.mark_entry_as_revealed(user:get_player_name(), "nodes", "mcl_portals:portal")
-- Achievement for finishing a Nether portal TO the Nether
local dim = mcl_worlds.pos_to_dimension({x=x, y=y, z=z})
if minetest.get_modpath("awards") and dim ~= "nether" and user:is_player() then
awards.unlock(user:get_player_name(), "mcl:buildNetherPortal")
end
end
return true
else
return false
end
end,
})
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