summaryrefslogtreecommitdiff
path: root/item_transport.lua
blob: e1ee19216393c94d406862924d80afaadd21c60b (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
local luaentity = pipeworks.luaentity
local enable_max_limit = minetest.settings:get("pipeworks_enable_items_per_tube_limit")
local max_tube_limit = tonumber(minetest.settings:get("pipeworks_max_items_per_tube")) or 30
if enable_max_limit == nil then enable_max_limit = true end

function pipeworks.tube_item(pos, item)
	error("obsolete pipeworks.tube_item() called; change caller to use pipeworks.tube_inject_item() instead")
end

function pipeworks.tube_inject_item(pos, start_pos, velocity, item, owner)
	-- Take item in any format
	local stack = ItemStack(item)
	local obj = luaentity.add_entity(pos, "pipeworks:tubed_item")
	obj:set_item(stack:to_string())
	obj.start_pos = vector.new(start_pos)
	obj:set_velocity(velocity)
	obj.owner = owner
	--obj:set_color("red") -- todo: this is test-only code
	return obj
end

-- adding two tube functions
-- can_remove(pos,node,stack,dir) returns the maximum number of items of that stack that can be removed
-- remove_items(pos,node,stack,dir,count) removes count items and returns them
-- both optional w/ sensible defaults and fallback to normal allow_* function
-- XXX: possibly change insert_object to insert_item

local default_adjlist={{x=0,y=0,z=1},{x=0,y=0,z=-1},{x=0,y=1,z=0},{x=0,y=-1,z=0},{x=1,y=0,z=0},{x=-1,y=0,z=0}}

function pipeworks.notvel(tbl, vel)
	local tbl2={}
	for _,val in ipairs(tbl) do
		if val.x ~= -vel.x or val.y ~= -vel.y or val.z ~= -vel.z then table.insert(tbl2, val) end
	end
	return tbl2
end

local tube_item_count = {}

minetest.register_globalstep(function(dtime)
	if not luaentity.entities then
		return
	end
	tube_item_count = {}
	for _, entity in pairs(luaentity.entities) do
		if entity.name == "pipeworks:tubed_item" then
			local h = minetest.hash_node_position(vector.round(entity._pos))
			tube_item_count[h] = (tube_item_count[h] or 0) + 1
		end
	end
end)



-- tube overload mechanism:
-- when the tube's item count (tracked in the above tube_item_count table)
-- exceeds the limit configured per tube, replace it with a broken one.

function pipeworks.break_tube(pos)
	local node = minetest.get_node(pos)
	local meta = minetest.get_meta(pos)
	meta:set_string("the_tube_was", minetest.serialize(node))
	minetest.swap_node(pos, {name = "pipeworks:broken_tube_1"})
	pipeworks.scan_for_tube_objects(pos)
end

local crunch_tube = function(pos, cnode, cmeta)
	if enable_max_limit then
		local h = minetest.hash_node_position(pos)
		local itemcount = tube_item_count[h] or 0
		if itemcount > max_tube_limit then
			pipeworks.logger("Warning - a tube at "..minetest.pos_to_string(pos).." broke due to too many items ("..itemcount..")")
			pipeworks.break_tube(pos)
		end
	end
end



-- 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 can_go

	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
		local adjlist_string = minetest.get_meta(pos):get_string("adjlist")
		local adjlist = minetest.deserialize(adjlist_string) or default_adjlist -- backward compat: if not found, use old behavior: all directions

		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)
		local node = minetest.get_node(npos)
		local reg_node = minetest.registered_nodes[node.name]
		if reg_node then
			local tube_def = reg_node.tube
			local tubedevice = minetest.get_item_group(node.name, "tubedevice")
			local tube_priority = (tube_def and tube_def.priority) or 100
			if tubedevice > 0 and tube_priority >= max_priority then
				if not tube_def or not tube_def.can_insert or
						tube_def.can_insert(npos, node, stack, vect, owner) then
					if tube_priority > max_priority then
						max_priority = tube_priority
						next_positions = {}
					end
					next_positions[#next_positions + 1] = {pos = npos, vect = vect}
				end
			end
		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 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
	return found, new_velocity, multimode
end



minetest.register_entity("pipeworks:tubed_item", {
	initial_properties = {
		hp_max = 1,
		physical = false,
		collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
		visual = "wielditem",
		visual_size = {x = 0.15, y = 0.15},
		textures = {""},
		spritediv = {x = 1, y = 1},
		initial_sprite_basepos = {x = 0, y = 0},
		is_visible = false,
	},

	physical_state = false,

	from_data = function(self, itemstring)
		local stack = ItemStack(itemstring)
		--[[
		local itemtable = stack:to_table()
		local itemname = nil
		if itemtable then
			itemname = stack:to_table().name
		end
		local item_texture = nil
		local item_type = ""
		if minetest.registered_items[itemname] then
			item_texture = minetest.registered_items[itemname].inventory_image
			item_type = minetest.registered_items[itemname].type
		end
		--]]
		self.object:set_properties({
			is_visible = true,
			textures = {stack:get_name()}
		})
		local def = stack:get_definition()
		self.object:set_yaw((def and def.type == "node") and 0 or math.pi * 0.25)
	end,

	get_staticdata = luaentity.get_staticdata,
	on_activate = function(self, staticdata) -- Legacy code, should be replaced later by luaentity.on_activate
		if staticdata == "" or staticdata == nil then
			return
		end
		if staticdata == "toremove" then
			self.object:remove()
			return
		end
		local item = minetest.deserialize(staticdata)
		pipeworks.tube_inject_item(self.object:get_pos(), item.start_pos, item.velocity, item.itemstring)
		self.object:remove()
	end,
})

minetest.register_entity("pipeworks:color_entity", {
	initial_properties = {
		hp_max = 1,
		physical = false,
		collisionbox = {0.1, 0.1, 0.1, 0.1, 0.1, 0.1},
		visual = "cube",
		visual_size = {x = 3.5, y = 3.5, z = 3.5}, -- todo: find correct size
		textures = {""},
		is_visible = false,
	},

	physical_state = false,

	from_data = function(self, color)
		local t = "pipeworks_color_"..color..".png"
		local prop = {
			is_visible = true,
			visual = "cube",
			textures = {t, t, t, t, t, t} -- todo: textures
		}
		self.object:set_properties(prop)
	end,

	get_staticdata = luaentity.get_staticdata,
	on_activate = luaentity.on_activate,
})

-- see below for usage:
-- determine if go_next returned a multi-mode set.
local is_multimode = function(v)
	return (type(v) == "table") and (v.__multimode)
end

luaentity.register_entity("pipeworks:tubed_item", {
	itemstring = '',
	item_entity = nil,
	color_entity = nil,
	color = nil,
	start_pos = nil,

	set_item = function(self, item)
		local itemstring = ItemStack(item):to_string() -- Accept any input format
		if self.itemstring == itemstring then
			return
		end
		if self.item_entity then
			self:remove_attached_entity(self.item_entity)
		end
		self.itemstring = itemstring
		self.item_entity = self:add_attached_entity("pipeworks:tubed_item", itemstring)
	end,

	set_color = function(self, color)
		if self.color == color then
			return
		end
		self.color = color
		if self.color_entity then
			self:remove_attached_entity(self.color_entity)
		end
		if color then
			self.color_entity = self:add_attached_entity("pipeworks:color_entity", color)
		else
			self.color_entity = nil
		end
	end,

	on_step = function(self, dtime)
		local pos = self:get_pos()
		if self.start_pos == nil then
			self.start_pos = vector.round(pos)
			self:set_pos(pos)
		end

		local stack = ItemStack(self.itemstring)

		local velocity = self:get_velocity()

		local moved = false
		local speed = math.abs(velocity.x + velocity.y + velocity.z)
		if speed == 0 then
			speed = 1
			moved = true
		end
		local vel = {x = velocity.x / speed, y = velocity.y / speed, z = velocity.z / speed, speed = speed}
		local moved_by = vector.distance(pos, self.start_pos)

		if moved_by >= 1 then
			self.start_pos = vector.add(self.start_pos, vel)
			moved = true
		end

		pipeworks.load_position(self.start_pos)
		local node = minetest.get_node(self.start_pos)
		if moved and minetest.get_item_group(node.name, "tubedevice_receiver") == 1 then
			local leftover
			if minetest.registered_nodes[node.name].tube and minetest.registered_nodes[node.name].tube.insert_object then
				leftover = minetest.registered_nodes[node.name].tube.insert_object(self.start_pos, node, stack, vel, self.owner)
			else
				leftover = stack
			end
			if leftover:is_empty() then
				self:remove()
				return
			end
			velocity = vector.multiply(velocity, -1)
			self:set_pos(vector.subtract(self.start_pos, vector.multiply(vel, moved_by - 1)))
			self:set_velocity(velocity)
			self:set_item(leftover:to_string())
			return
		end

		if moved then
			local found_next, new_velocity, multimode = go_next(self.start_pos, velocity, stack, self.owner) -- todo: color
			local rev_vel = vector.multiply(velocity, -1)
			local rev_dir = vector.direction(self.start_pos,vector.add(self.start_pos,rev_vel))
			local rev_node = minetest.get_node(vector.round(vector.add(self.start_pos,rev_dir)))
			local tube_present = minetest.get_item_group(rev_node.name,"tubedevice") == 1
			if not found_next then
				if pipeworks.drop_on_routing_fail or not tube_present or
						minetest.get_item_group(rev_node.name,"tube") ~= 1 then
					-- Using add_item instead of item_drop since this makes pipeworks backward
					-- compatible with Minetest 0.4.13.
					-- Using item_drop here makes Minetest 0.4.13 crash.
					local dropped_item = minetest.add_item(self.start_pos, stack)
					if dropped_item then
						dropped_item:set_velocity(vector.multiply(velocity, 5))
						self:remove()
					end
					return
				else
					velocity = vector.multiply(velocity, -1)
					self:set_pos(vector.subtract(self.start_pos, vector.multiply(vel, moved_by - 1)))
					self:set_velocity(velocity)
				end
			elseif is_multimode(multimode) then
				-- create new stacks according to returned data.
				local s = self.start_pos
				for _, split in ipairs(multimode) do
					pipeworks.tube_inject_item(s, s, split.velocity, split.itemstack, self.owner)
				end
				-- remove ourself now the splits are sent
				self:remove()
				return
			end

			if new_velocity and not vector.equals(velocity, new_velocity) then
				local nvelr = math.abs(new_velocity.x + new_velocity.y + new_velocity.z)
				self:set_pos(vector.add(self.start_pos, vector.multiply(new_velocity, (moved_by - 1) / nvelr)))
				self:set_velocity(new_velocity)
			end
		end
	end
})

if minetest.get_modpath("mesecons_mvps") then
	mesecon.register_mvps_unmov("pipeworks:tubed_item")
	mesecon.register_mvps_unmov("pipeworks:color_entity")
	mesecon.register_on_mvps_move(function(moved_nodes)
		local moved = {}
		for _, n in ipairs(moved_nodes) do
			moved[minetest.hash_node_position(n.oldpos)] = vector.subtract(n.pos, n.oldpos)
		end
		for _, entity in pairs(luaentity.entities) do
			if entity.name == "pipeworks:tubed_item" then
				local pos = entity:get_pos()
				local rpos = vector.round(pos)
				local dir = moved[minetest.hash_node_position(rpos)]
				if dir then
					entity:set_pos(vector.add(pos, dir))
					entity.start_pos = vector.add(entity.start_pos, dir)
				end
			end
		end
	end)
end