Smoother link of processing cycles to ABM cycles

Make the generic processing machine code willing to complete more than
one processing cycle in one ABM cycle, and more generally to carry
over leftover processing effort after completing a processing cycle.
The src_time meta item now represents accumulated processing effort
(time multiplied by speed) in a scaled form (to retain fractions),
rather than just time in integral seconds.  This affects the MV furnace,
with speed 4 and most recipe times being 3 s, and will be essential for
faster furnaces.

technic/machines/register/machine_base.lua

@@ -15,6 +15,10 @@ local tube = {
 	connect_sides = {left = 1, right = 1, back = 1, top = 1, bottom = 1},
 }
 
+local function round(v)
+	return math.floor(v + 0.5)
+end
+
 function technic.register_base_machine(data)
 	local typename = data.typename
 	local input_size = technic.recipes[typename].input_size
@@ -70,51 +74,53 @@ function technic.register_base_machine(data)
 			technic.handle_machine_pipeworks(pos, tube_upgrade)
 		end
 
-		local result = technic.get_recipe(typename, inv:get_list("src"))
+		local powered = eu_input >= machine_demand[EU_upgrade+1]
-
+		if powered then
-		if not result then
+			meta:set_int("src_time", meta:get_int("src_time") + round(data.speed*10))
-			technic.swap_node(pos, machine_node)
-			meta:set_string("infotext", S("%s Idle"):format(machine_desc_tier))
-			meta:set_int(tier.."_EU_demand", 0)
-			return
 		end
-		
+		while true do
-		if eu_input < machine_demand[EU_upgrade+1] then
+			local result = technic.get_recipe(typename, inv:get_list("src"))
-			-- Unpowered - go idle
+			if not result then
-			technic.swap_node(pos, machine_node)
+				technic.swap_node(pos, machine_node)
-			meta:set_string("infotext", S("%s Unpowered"):format(machine_desc_tier))
+				meta:set_string("infotext", S("%s Idle"):format(machine_desc_tier))
-		elseif eu_input >= machine_demand[EU_upgrade+1] then
+				meta:set_int(tier.."_EU_demand", 0)
-			-- Powered	
+				meta:set_int("src_time", 0)
+				return
+			end
+			meta:set_int(tier.."_EU_demand", machine_demand[EU_upgrade+1])
 			technic.swap_node(pos, machine_node.."_active")
 			meta:set_string("infotext", S("%s Active"):format(machine_desc_tier))
-
+			if meta:get_int("src_time") < round(result.time*10) then
-			meta:set_int("src_time", meta:get_int("src_time") + 1)
+				if not powered then
-			if meta:get_int("src_time") >= result.time / data.speed then
+					technic.swap_node(pos, machine_node)
-				meta:set_int("src_time", 0)
+					meta:set_string("infotext", S("%s Unpowered"):format(machine_desc_tier))
-				local output = result.output
-				if type(output) ~= "table" then output = { output } end
-				local output_stacks = {}
-				for _, o in ipairs(output) do
-					table.insert(output_stacks, ItemStack(o))
-				end
-				local room_for_output = true
-				inv:set_size("dst_tmp", inv:get_size("dst"))
-				inv:set_list("dst_tmp", inv:get_list("dst"))
-				for _, o in ipairs(output_stacks) do
-					if not inv:room_for_item("dst_tmp", o) then
-						room_for_output = false
-						break
-					end
-					inv:add_item("dst_tmp", o)
-				end
-				if room_for_output then
-					inv:set_list("src", result.new_input)
-					inv:set_list("dst", inv:get_list("dst_tmp"))
-				else
 				end
+				return
 			end
+			local output = result.output
+			if type(output) ~= "table" then output = { output } end
+			local output_stacks = {}
+			for _, o in ipairs(output) do
+				table.insert(output_stacks, ItemStack(o))
+			end
+			local room_for_output = true
+			inv:set_size("dst_tmp", inv:get_size("dst"))
+			inv:set_list("dst_tmp", inv:get_list("dst"))
+			for _, o in ipairs(output_stacks) do
+				if not inv:room_for_item("dst_tmp", o) then
+					room_for_output = false
+					break
+				end
+				inv:add_item("dst_tmp", o)
+			end
+			if not room_for_output then
+				meta:set_int("src_time", round(result.time*10))
+				return
+			end
+			meta:set_int("src_time", meta:get_int("src_time") - round(result.time*10))
+			inv:set_list("src", result.new_input)
+			inv:set_list("dst", inv:get_list("dst_tmp"))
 		end
-		meta:set_int(tier.."_EU_demand", machine_demand[EU_upgrade+1])
 	end
 	
 	minetest.register_node("technic:"..ltier.."_"..machine_name, {