From a2e183c6f3d76e809bbc2d6b596e7e000f06ee66 Mon Sep 17 00:00:00 2001 From: thetaepsilon-gamedev Date: Tue, 19 Dec 2017 23:15:44 +0000 Subject: item_transport.lua: split out determination of next position in go_next() into separate function --- item_transport.lua | 95 ++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 60 insertions(+), 35 deletions(-) diff --git a/item_transport.lua b/item_transport.lua index 72f6d7d..7219f7e 100644 --- a/item_transport.lua +++ b/item_transport.lua @@ -70,47 +70,24 @@ end --- function called by the on_step callback of the pipeworks tube luaentity. --- the routine is passed the current node position, velocity, itemstack, --- and owner name. --- returns three values: --- * a boolean "found destination" status; --- * a new velocity vector that the tubed item should use, or nil if not found; --- * a "multi-mode" data table (or nil if N/A) where a stack was split apart. --- if this is not nil, the luaentity spawns new tubed items for each new fragment stack, --- then deletes itself (i.e. the original item stack). -local function go_next(pos, velocity, stack, owner) +-- compatibility behaviour for the existing can_go() callbacks, +-- which can only specify a list of possible positions. +local function go_next_compat(pos, cnode, cmeta, cycledir, vel, stack, owner) local next_positions = {} local max_priority = 0 - local cnode = minetest.get_node(pos) - local cmeta = minetest.get_meta(pos) local can_go - local speed = math.abs(velocity.x + velocity.y + velocity.z) - if speed == 0 then - speed = 1 - end - local vel = {x = velocity.x/speed, y = velocity.y/speed, z = velocity.z/speed,speed=speed} - if speed >= 4.1 then - speed = 4 - elseif speed >= 1.1 then - speed = speed - 0.1 - else - speed = 1 - end - vel.speed = speed - - crunch_tube(pos, cnode, cmeta) - -- cycling of outputs: - -- an integer counter is kept in each pipe's metadata, - -- which allows tracking which output was previously chosen. - -- note reliance on get_int returning 0 for uninitialised. - local cycledir = cmeta:get_int("tubedir") if minetest.registered_nodes[cnode.name] and minetest.registered_nodes[cnode.name].tube and minetest.registered_nodes[cnode.name].tube.can_go then can_go = minetest.registered_nodes[cnode.name].tube.can_go(pos, cnode, vel, stack) else can_go = pipeworks.notvel(adjlist, vel) end + -- can_go() is expected to return an array-like table of candidate offsets. + -- for each one, look at the node at that offset and determine if it can accept the item. + -- also note the prioritisation: + -- if any tube is found with a greater priority than previously discovered, + -- then the valid positions are reset and and subsequent positions under this are skipped. + -- this has the effect of allowing only equal priorities to co-exist. for _, vect in ipairs(can_go) do local npos = vector.add(pos, vect) pipeworks.load_position(npos) @@ -133,18 +110,66 @@ local function go_next(pos, velocity, stack, owner) end end + -- indicate not found if no valid rules were picked up, + -- and don't change the counter. if not next_positions[1] then - return false, nil, nil + return cycledir, false, nil, nil end + -- otherwise rotate to the next output direction and return that local n = (cycledir % (#next_positions)) + 1 + local new_velocity = vector.multiply(next_positions[n].vect, vel.speed) + return n, true, new_velocity, nil +end + + + + +-- function called by the on_step callback of the pipeworks tube luaentity. +-- the routine is passed the current node position, velocity, itemstack, +-- and owner name. +-- returns three values: +-- * a boolean "found destination" status; +-- * a new velocity vector that the tubed item should use, or nil if not found; +-- * a "multi-mode" data table (or nil if N/A) where a stack was split apart. +-- if this is not nil, the luaentity spawns new tubed items for each new fragment stack, +-- then deletes itself (i.e. the original item stack). +local function go_next(pos, velocity, stack, owner) + local cnode = minetest.get_node(pos) + local cmeta = minetest.get_meta(pos) + local speed = math.abs(velocity.x + velocity.y + velocity.z) + if speed == 0 then + speed = 1 + end + local vel = {x = velocity.x/speed, y = velocity.y/speed, z = velocity.z/speed,speed=speed} + if speed >= 4.1 then + speed = 4 + elseif speed >= 1.1 then + speed = speed - 0.1 + else + speed = 1 + end + vel.speed = speed + + crunch_tube(pos, cnode, cmeta) + -- cycling of outputs: + -- an integer counter is kept in each pipe's metadata, + -- which allows tracking which output was previously chosen. + -- note reliance on get_int returning 0 for uninitialised. + local cycledir = cmeta:get_int("tubedir") + + -- pulled out and factored out into go_next_compat() above. + -- n is the new value of the cycle counter. + -- XXX: this probably needs cleaning up after being split out, + -- seven args is a bit too many + local n, found, new_velocity, multimode = go_next_compat(pos, cnode, cmeta, cycledir, vel, stack, owner) + -- if not using output cycling, -- don't update the field so it stays the same for the next item. if pipeworks.enable_cyclic_mode then cmeta:set_int("tubedir", n) end - local new_velocity = vector.multiply(next_positions[n].vect, vel.speed) - return true, new_velocity, nil + return found, new_velocity, multimode end -- cgit v1.2.3