ContentCAO: Fix segfault when minimap is disabled - minetest.git

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author	SmallJoker <mk939@ymail.com>	2020-11-08 11:30:16 +0100
committer	SmallJoker <mk939@ymail.com>	2020-11-08 11:30:16 +0100
commit	c940a57a384b1a75730776906451078d25c5aa52 (patch)
tree	0eb4843a765cd41fc156ce03da9ccc4723faac73 /build/android/app/src/main/java/net
parent	8c1871fa2c066a2086988684256da97bd0f4ab6f (diff)
download	minetest-c940a57a384b1a75730776906451078d25c5aa52.tar.gz minetest-c940a57a384b1a75730776906451078d25c5aa52.tar.bz2 minetest-c940a57a384b1a75730776906451078d25c5aa52.zip

ContentCAO: Fix segfault when minimap is disabled

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--couple.lua --Handles coupling and discoupling of trains, and defines the coupling entities --Rework June 2021 - some functions from trainlogic.lua have been moved here -- COUPLING -- -- During coupling rework, the behavior of coupling was changed to make automation easier. It is now as follows: -- Coupling is only ever initiated when a train is standing somewhere (not moving) and another train drives onto one of its ends -- with a speed greater than 0 -- "stationary" train is the one standing there - in old code called "train2" -- "initiating" train is the one that approached it and bumped into it - typically an engine - in old code called "train1" -- When the initiating train has autocouple set, trains are immediately coupled -- When not, a couple entity is spawned and coupling commences on click -- Coupling MUST preserve the train ID of the initiating train, so it is done like this: -- index of initiating train is set so that it matches the front pos of stationary train -- remove stationary train -- wagons of stationary train are inserted at the beginning of initiating train (considers direction of stat_train and inserts reverse if required) -- train.couple_* contain references to ObjectRefs of couple objects, which contain all relevant information -- These objectRefs will delete themselves once the couples no longer match (see below) advtrains.coupler_types = {} function advtrains.register_coupler_type(code, name) advtrains.coupler_types[code] = name end -- Register some default couplers advtrains.register_coupler_type("chain", attrans("Buffer and Chain Coupler")) advtrains.register_coupler_type("scharfenberg", attrans("Scharfenberg Coupler")) local function create_couple_entity(pos, train1, t1_is_front, train2, t2_is_front) local id1 = train1.id local id2 = train2.id -- delete previous couple entities if t1_is_front then if train1.cpl_front then train1.cpl_front:remove() end else if train1.cpl_back then train1.cpl_back:remove() end end if t2_is_front then if train2.cpl_front then train2.cpl_front:remove() end else if train2.cpl_back then train2.cpl_back:remove() end end local obj=minetest.add_entity(pos, "advtrains:couple") if not obj then error("Failed creating couple object!") return end local le=obj:get_luaentity() le.train_id_1=id1 le.t1_is_front=t1_is_front le.train_id_2=id2 le.t2_is_front=t2_is_front --atdebug("created couple between",train1.id,train2.id,t2_is_front) if t1_is_front then train1.cpl_front = obj else train2.cpl_back = obj end if t2_is_front then train2.cpl_front = obj else train2.cpl_back = obj end end -- Old static couple checking. Never used for autocouple, only used for standing trains if train did not approach local CPL_CHK_DST = -1 local CPL_ZONE = 2 function advtrains.train_check_couples(train) --atdebug("rechecking couples") if train.cpl_front then if not train.cpl_front:get_yaw() then -- objectref is no longer valid. reset. train.cpl_front = nil end end if not train.cpl_front then -- recheck front couple local pos = advtrains.path_get(train, atround(train.index) + CPL_CHK_DST) if advtrains.is_node_loaded(pos) then -- if the position is loaded... local front_trains = advtrains.occ.reverse_lookup_sel(pos, "in_train") for tid, idx in pairs(front_trains) do local other_train = advtrains.trains[tid] if not advtrains.train_ensure_init(tid, other_train) then atwarn("Train",tid,"is not initialized! Couldn't check couples!") return end --atdebug(train.id,"front: ",idx,"on",tid,atround(other_train.index),atround(other_train.end_index)) if other_train.velocity == 0 then if idx>=other_train.index and idx<=other_train.index + CPL_ZONE then create_couple_entity(pos, train, true, other_train, true) break end if idx<=other_train.end_index and idx>=other_train.end_index - CPL_ZONE then create_couple_entity(pos, train, true, other_train, false) break end end end end end if train.cpl_back then if not train.cpl_back:get_yaw() then -- objectref is no longer valid. reset. train.cpl_back = nil end end if not train.cpl_back then -- recheck back couple local pos = advtrains.path_get(train, atround(train.end_index) - CPL_CHK_DST) if advtrains.is_node_loaded(pos) then -- if the position is loaded... local back_trains = advtrains.occ.reverse_lookup_sel(pos, "in_train") for tid, idx in pairs(back_trains) do local other_train = advtrains.trains[tid] if not advtrains.train_ensure_init(tid, other_train) then atwarn("Train",tid,"is not initialized! Couldn't check couples!") return end --atdebug(train.id,"back: ",idx,"on",tid,atround(other_train.index),atround(other_train.end_index)) if other_train.velocity == 0 then if idx>=other_train.index and idx<=other_train.index + CPL_ZONE then create_couple_entity(pos, train, false, other_train, true) break end if idx<=other_train.end_index and idx>=other_train.end_index - CPL_ZONE then create_couple_entity(pos, train, false, other_train, false) break end end end end end end -- Deletes couple entities from the train function advtrains.couple_invalidate(train) if train.cpl_back then train.cpl_back:remove() train.cpl_back = nil end if train.cpl_front then train.cpl_front:remove() train.cpl_front = nil end train.couples_up_to_date = nil end -- Called from train_step_b() when the current train (init_train) just stopped at one of the end indices of another train (stat_train) -- Depending on autocouple, either couples immediately or spawns a couple entity function advtrains.couple_initiate_with(init_train, stat_train, stat_is_front) --atdebug("Couple init autocouple=",init_train.autocouple,"atc_w_acpl=",init_train.atc_wait_autocouple) if init_train.autocouple or init_train.atc_wait_autocouple then local cplmatch, msg = advtrains.check_matching_coupler_types(init_train, true, stat_train, stat_is_front) if cplmatch then advtrains.couple_trains(init_train, false, stat_train, stat_is_front) -- clear atc couple waiting blocker init_train.atc_wait_autocouple = nil return end end -- get here if either autocouple is not on or couples dont match local pos = advtrains.path_get_interpolated(init_train, init_train.index) create_couple_entity(pos, init_train, true, stat_train, stat_is_front) -- clear ATC command on collision advtrains.atc.train_reset_command(init_train) end -- check if the player has permission for the first/last wagon of the train local function check_twagon_owner(train, b_first, pname) local wtp = b_first and 1 or #train.trainparts local wid = train.trainparts[wtp] local wdata = advtrains.wagons[wid] if wdata then return advtrains.check_driving_couple_protection(pname, wdata.owner, wdata.whitelist) end return false end -- Perform coupling, but check if the player is authorized to couple function advtrains.safe_couple_trains(train1, t1_is_front, train2, t2_is_front, pname) if pname and not minetest.check_player_privs(pname, "train_operator") then minetest.chat_send_player(pname, S("You are not allowed to couple trains without the train_operator privilege.")) return false end local wck_t1, wck_t2 if pname then wck_t1 = check_twagon_owner(train1, t1_is_front, pname) wck_t2 = check_twagon_owner(train2, t2_is_front, pname) end if (wck_t1 or wck_t2) or not pname then local cplmatch, msg = advtrains.check_matching_coupler_types(train1, t1_is_front, train2, t2_is_front) if cplmatch then advtrains.couple_trains(train1, not t1_is_front, train2, t2_is_front) else minetest.chat_send_player(pname, msg) end end end -- Actually performs the train coupling. Always retains train ID of train1 function advtrains.couple_trains(init_train, invert_init_train, stat_train, stat_train_opposite) --atdebug("Couple trains init=",init_train.id,"initinv=",invert_init_train,"stat=",stat_train.id,"statreverse=",stat_train_opposite) if not advtrains.train_ensure_init(init_train.id, init_train) then


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