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Add utilities to convert between an ObjectRef, it's active object id and a 128bit uuid, move minecart data from entity staticdata to mod storage to eventually allow updating carts when out of range of players and also track what carts are alive, implement on-rail cart collisions

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This commit is contained in:
teknomunk 2024-04-06 13:40:40 +00:00
parent ce9e3481af
commit bacc8bdf64
3 changed files with 183 additions and 20 deletions
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46
mods/CORE/mcl_util/init.lua
View file

@ -1151,3 +1151,49 @@ function mcl_util.table_keys(t)
return keys
end
local uuid_to_aoid_cache = {}
local function scan_active_objects()
-- Update active object ids for all active objects
for active_object_id,o in pairs(minetest.luaentities) do
o._active_object_id = active_object_id
if o._uuid then
uuid_to_aoid_cache[o._uuid] = active_object_id
end
end
end
function mcl_util.get_active_object_id(obj)
local le = obj:get_luaentity()
-- If the active object id in the lua entity is correct, return that
if le._active_object_id and minetest.luaentities[le._active_object_id] == le then
return le._active_object_id
end
scan_active_objects()
return le._active_object_id
end
function mcl_util.get_active_object_id_from_uuid(uuid)
return uuid_to_aoid_cache[uuid] or scan_active_objects() or uuid_to_aoid_cache[uuid]
end
function mcl_util.get_uuid(obj)
local le = obj:get_luaentity()
if le._uuid then return le._uuid end
-- Generate a random 128-bit ID that can be assumed to be unique
-- To have a 1% chance of a collision, there would have to be 1.6x10^76 IDs generated
-- https://en.wikipedia.org/wiki/Birthday_problem#Probability_table
local u = {}
for i = 1,16 do
u[#u + 1] = string.format("%02X",math.random(1,255))
end
le._uuid = table.concat(u)
-- Update the cache with this new id
aoid = mcl_util.get_active_object_id(obj)
uuid_to_aoid_cache[le._uuid] = aoid
return le._uuid
end

143
mods/ENTITIES/mcl_minecarts/carts.lua
View file

@ -1,5 +1,6 @@
local modname = minetest.get_current_modname()
local mod = mcl_minecarts
local storage = minetest.get_mod_storage()
local S = minetest.get_translator(modname)
local LOGGING_ON = minetest.settings:get_bool("mcl_logging_minecarts", false)
@ -19,6 +20,32 @@ local friction = 0.4
local MINECART_MAX_HP = 4
local PASSENGER_ATTACH_POSITION = vector.new(0, -1.75, 0)
local cart_data = {}
local cart_data_fail_cache = {}
local function get_cart_data(uuid)
if cart_data[uuid] then return cart_data[uuid] end
if cart_data_fail_cache[uuid] then return nil end
local data = minetest.deserialize(storage:get_string("cart-"..uuid))
if not data then
cart_data_fail_cache[uuid] = true
return nil
end
cart_data[uuid] = data
return data
end
local function save_cart_data(uuid)
if not cart_data[uuid] then return end
storage:set_string("cart-"..uuid,minetest.serialize(cart_data[uuid]))
end
local function destroy_cart_data(uuid)
storage:set_string("cart-"..uuid,"")
cart_data[uuid] = nil
cart_data_fail_cache[uuid] = true
end
local function detach_minecart(self)
local staticdata = self._staticdata
@ -72,13 +99,68 @@ local function handle_cart_enter_exit(self, pos, next_dir, event)
local hook = self["_mcl_minecarts_"..event]
if hook then hook(self, pos) end
end
local function set_metadata_cart_status(pos, uuid, state)
local meta = minetest.get_meta(pos)
local carts = minetest.deserialize(meta:get_string("_mcl_minecarts_carts")) or {}
carts[uuid] = state
meta:set_string("_mcl_minecarts_carts", minetest.serialize(carts))
end
local function handle_cart_enter(self, pos, next_dir)
--print("entering "..tostring(pos))
set_metadata_cart_status(pos, self._staticdata.uuid, 1)
handle_cart_enter_exit(self, pos, next_dir, "on_enter" )
end
local function handle_cart_leave(self, pos, next_dir)
--print("leaving "..tostring(pos))
set_metadata_cart_status(pos, self._staticdata.uuid, nil)
handle_cart_enter_exit(self, pos, next_dir, "on_leave" )
end
local function handle_cart_collision(cart1, pos, next_dir)
local meta = minetest.get_meta(pos)
local carts = minetest.deserialize(meta:get_string("_mcl_minecarts_carts")) or {}
local cart_uuid = nil
local dirty = false
for uuid,v in pairs(carts) do
-- Clean up dead carts
if not get_cart_data(uuid) then
carts[uuid] = nil
dirty = true
uuid = nil
end
if uuid and uuid ~= cart1._staticdata.uuid then cart_uuid = uuid end
end
if dirty then
meta:set_string("_mcl_minecarts_carts",minetest.serialize(carts))
end
local meta = minetest.get_meta(vector.add(pos,next_dir))
if not cart_uuid then return end
minetest.log("action","cart #"..cart1._staticdata.uuid.." collided with cart #"..cart_uuid.." at "..tostring(pos))
local cart2_aoid = mcl_util.get_active_object_id_from_uuid(cart_uuid)
local cart2 = minetest.luaentities[cart2_aoid]
if not cart2 then return end
local cart1_staticdata = cart1._staticdata
local cart2_staticdata = cart2._staticdata
local u1 = cart1_staticdata.velocity
local u2 = cart2_staticdata.velocity
local m1 = cart1_staticdata.mass
local m2 = cart2_staticdata.mass
-- Calculate new velocities according to https://en.wikipedia.org/wiki/Elastic_collision#One-dimensional_Newtonian
local c1 = m1 + m2
local d = m1 - m2
local v1 = ( d * u1 + 2 * m2 * u2 ) / c1
local v2 = ( 2 * m1 * u1 + d * u2 ) / c1
cart1_staticdata.velocity = v1
cart2_staticdata.velocity = v2
end
local function handle_cart_node_watches(self, dtime)
local staticdata = self._staticdata
local watches = staticdata.node_watches or {}
@ -246,7 +328,7 @@ local function do_movement_step(self, dtime)
end
if DEBUG and ( v_0 > 0 or a ~= 0 ) then
print( " cart #"..tostring(staticdata.cart_id)..
print( " cart "..tostring(staticdata.uuid)..
": a="..tostring(a)..
",v_0="..tostring(v_0)..
",x_0="..tostring(x_0)..
@ -305,7 +387,7 @@ local function do_movement_step(self, dtime)
staticdata.distance = x_1
if DEBUG and (1==0) and ( v_0 > 0 or a ~= 0 ) then
print( "- cart #"..tostring(staticdata.cart_id)..
print( "- cart #"..tostring(staticdata.uuid)..
": a="..tostring(a)..
",v_0="..tostring(v_0)..
",v_1="..tostring(v_1)..
@ -337,6 +419,9 @@ local function do_movement_step(self, dtime)
print( "Changing direction from "..tostring(staticdata.dir).." to "..tostring(next_dir))
end
-- Handle cart collisions
handle_cart_collision(self, pos, next_dir)
-- Leave the old node
handle_cart_leave(self, old_pos, next_dir )
@ -376,7 +461,7 @@ local function do_movement_step(self, dtime)
-- Debug reporting
if DEBUG and ( v_0 > 0 or v_1 > 0 ) then
print( " cart #"..tostring(staticdata.cart_id)..
print( " cart #"..tostring(staticdata.uuid)..
": a="..tostring(a)..
",v_0="..tostring(v_0)..
",v_1="..tostring(v_1)..
@ -615,7 +700,7 @@ local function make_staticdata( railtype, connected_at, dir )
distance = 0,
velocity = 0,
dir = vector.new(dir),
cart_id = math.random(1,1000000000),
mass = 1,
}
end
@ -644,24 +729,40 @@ local DEFAULT_CART_DEF = {
_staticdata = nil,
}
function DEFAULT_CART_DEF:on_activate(staticdata, dtime_s)
-- Transfer older data
local data = minetest.deserialize(staticdata) or {}
if not data.uuid then
data.uuid = mcl_util.get_uuid(self.object)
end
local cd = get_cart_data(data.uuid)
if not cd then
cart_data[data.uuid] = data
cart_data_fail_cache[data.uuid] = nil
save_cart_data(data.uuid)
end
-- Initialize
local data = minetest.deserialize(staticdata)
if type(data) == "table" then
-- Migrate old data
if data._railtype then
data.railtype = data._railtype
data._railtype = nil
end
-- Fix up types
data.dir = vector.new(data.dir)
-- Fix mass
data.mass = data.mass or 1
-- Make sure all carts have an ID to isolate them
data.cart_id = staticdata.cart_id or math.random(1,1000000000)
self._uuid = data.uuid
data.uuid = mcl_util.get_uuid(self.object)
self._staticdata = data
end
-- Activate cart if on activator rail
-- Activate cart if on powered activator rail
if self.on_activate_by_rail then
local pos = self.object:get_pos()
local node = minetest.get_node(vector.floor(pos))
@ -670,6 +771,11 @@ function DEFAULT_CART_DEF:on_activate(staticdata, dtime_s)
end
end
end
function DEFAULT_CART_DEF:get_staticdata()
save_cart_data(self._staticdata.uuid)
return minetest.serialize({uuid = self._staticdata.uuid})
end
function DEFAULT_CART_DEF:add_node_watch(pos)
local staticdata = self._staticdata
local watches = staticdata.node_watches or {}
@ -693,9 +799,6 @@ function DEFAULT_CART_DEF:remove_node_watch(pos)
end
staticdata.node_watches = new_watches
end
function DEFAULT_CART_DEF:get_staticdata()
return minetest.serialize(self._staticdata or {})
end
function DEFAULT_CART_DEF:on_step(dtime)
local staticdata = self._staticdata
if not staticdata then
@ -765,11 +868,14 @@ function DEFAULT_CART_DEF:on_step(dtime)
local r = 0.6
for _, node_pos in pairs({{r, 0}, {0, r}, {-r, 0}, {0, -r}}) do
if minetest.get_node(vector.offset(pos, node_pos[1], 0, node_pos[2])).name == "mcl_core:cactus" then
self:on_death()
--[[
detach_driver(self)
local drop = self.drop
for d = 1, #drop do
minetest.add_item(pos, drop[d])
end
]]
self.object:remove()
return
end
@ -777,6 +883,8 @@ function DEFAULT_CART_DEF:on_step(dtime)
end
function DEFAULT_CART_DEF:on_death(killer)
local staticdata = self._staticdata
minetest.log("action", "cart #"..staticdata.uuid.." was killed")
detach_driver(self)
-- Detach passenger
@ -792,6 +900,9 @@ function DEFAULT_CART_DEF:on_death(killer)
mcl_log("TODO: handle detatched minecart death")
end
-- Remove data
destroy_cart_data(staticdata.uuid)
-- Drop items
local drop = self.drop
if not killer or not minetest.is_creative_enabled(killer:get_player_name()) then
@ -838,7 +949,12 @@ function mcl_minecarts.place_minecart(itemstack, pointed_thing, placer)
-- Update static data
local le = cart:get_luaentity()
if le then
le._staticdata = make_staticdata( railtype, railpos, cart_dir )
local uuid = mcl_util.get_uuid(cart)
data = make_staticdata( railtype, railpos, cart_dir )
data.uuid = uuid
cart_data[uuid] = data
le._staticdata = data
save_cart_data(le._staticdata.uuid)
end
-- Call placer
@ -1386,3 +1502,8 @@ if minetest.get_modpath("mcl_wip") then
mcl_wip.register_wip_item("mcl_minecarts:furnace_minecart")
mcl_wip.register_wip_item("mcl_minecarts:command_block_minecart")
end
minetest.register_globalstep(function(dtime)
-- TODO: handle periodically updating out-of-range carts
end)

14
mods/ENTITIES/mcl_minecarts/rails.lua
View file

@ -177,7 +177,7 @@ table_merge(SLOPED_RAIL_DEF,{
},
})
local function register_rail_v2(itemstring, ndef)
function mod.register_rail(itemstring, ndef)
assert(ndef.tiles)
-- Extract out the craft recipe
@ -188,15 +188,14 @@ local function register_rail_v2(itemstring, ndef)
if not ndef.inventory_image then ndef.inventory_image = ndef.tiles[1] end
if not ndef.wield_image then ndef.wield_image = ndef.tiles[1] end
--print("registering rail "..itemstring.." with definition: "..dump(ndef))
print("registering rail "..itemstring.." with definition: "..dump(ndef))
-- Make registrations
minetest.register_node(itemstring, ndef)
if craft then minetest.register_craft(craft) end
end
mod.register_rail = register_rail_v2
local function register_straight_rail(base_name, tiles, def)
function mod.register_straight_rail(base_name, tiles, def)
def = def or {}
local base_def = table.copy(BASE_DEF)
local sloped_def = table.copy(SLOPED_RAIL_DEF)
@ -235,9 +234,8 @@ local function register_straight_rail(base_name, tiles, def)
},
}))
end
mod.register_straight_rail = register_straight_rail
local function register_curves_rail(base_name, tiles, def)
function mod.register_curves_rail(base_name, tiles, def)
def = def or {}
local base_def = table.copy(BASE_DEF)
local sloped_def = table.copy(SLOPED_RAIL_DEF)
@ -333,9 +331,8 @@ local function register_curves_rail(base_name, tiles, def)
},
}))
end
mod.register_curves_rail = register_curves_rail
local function register_rail_sloped(itemstring, def)
function mod.register_rail_sloped(itemstring, def)
assert(def.tiles)
-- Build the node definition
@ -351,7 +348,6 @@ local function register_rail_sloped(itemstring, def)
-- Make registrations
minetest.register_node(itemstring, ndef)
end
mod.register_rail_sloped = register_rail_sloped
-- Redstone rules
local rail_rules_long =