Updates gas filter

code/ATMOSPHERICS/atmospherics_helpers.dm

@@ -28,7 +28,7 @@
 	if (available_power && specific_power > 0)
 		transfer_moles = min(transfer_moles, available_power / specific_power)
 	
-	if (transfer_moles < MINUMUM_MOLES_TO_PUMP) //we check this repeatedly so that we do as little processing as possible
+	if (transfer_moles < MINUMUM_MOLES_TO_PUMP) //if we cant transfer enough gas just stop to avoid further processing
 		return -1
 	
 	last_flow_rate = (transfer_moles/source.total_moles)*source.volume //group_multiplier gets divided out here
@@ -95,7 +95,7 @@
 		//filter gas in proportion to the mole ratio
 		transfer_moles = min(transfer_moles, total_transfer_moles*(source.gas[g]/total_filterable_moles))
 		
-		//use update=0. All the filtered gasses get added simultaneously, so we update after the for loop.
+		//use update=0. All the filtered gasses are supposed to be added simultaneously, so we update after the for loop.
 		source.adjust_gas(g, -transfer_moles, update=0)
 		sink.adjust_gas_temp(g, transfer_moles, source.temperature, update=0)
 		
@@ -121,7 +121,6 @@
 		return -1
 
 	filtering &= source.gas		//only filter gasses that are actually there.
-	var/list/not_filtering = source.gas - filtering
 	
 	var/total_filterable_moles = 0
 	var/total_unfilterable_moles = 0
@@ -166,18 +165,15 @@
 	for (var/g in removed.gas)
 		var/power_used = specific_power_gas[g]*removed.gas[g]
 		
-		//use update=0. All the filtered gasses get added simultaneously, so we update after the for loop.
 		if (g in filtering)
+			//use update=0. All the filtered gasses are supposed to be added simultaneously, so we update after the for loop.
 			sink_filtered.adjust_gas_temp(g, removed.gas[g], removed.temperature, update=0)
 			filtered_power_used += power_used
 		else
-			sink_clean.adjust_gas_temp(g, removed.gas[g], removed.temperature, update=0)
 			unfiltered_power_used += power_used
 	
 	sink_filtered.update_values()
-	sink_clean.update_values()
-	
-	del(removed) //removed should have nothing in it now, so we can just get rid of it.
+	sink_clean.merge(removed)
 	
 	if (filtered_power_used > 0)
 		sink_filtered.add_thermal_energy(filtered_power_used) //1st law - energy is conserved
@@ -217,7 +213,7 @@
 	return specific_power
 
 //This proc handles power usages so that we only have to call use_power() when the pump is loaded but not at full load. 
-/obj/machinery/atmospherics/proc/handle_pump_power_draw(var/usage_amount)
+/obj/machinery/atmospherics/proc/handle_power_draw(var/usage_amount)
 	if (usage_amount > active_power_usage - 5)
 		update_use_power(2)
 	else

code/ATMOSPHERICS/components/binary_devices/pump.dm

@@ -94,10 +94,10 @@ Thus, the two variables affect pump operation are set in New():
 		last_power_draw = 0
 		last_flow_rate = 0
 	else if (power_draw > 0)
-		handle_pump_power_draw(power_draw)
+		handle_power_draw(power_draw)
 		last_power_draw = power_draw
 	else
-		handle_pump_power_draw(idle_power_usage)
+		handle_power_draw(idle_power_usage)
 		last_power_draw = idle_power_usage
 
 	return 1

code/ATMOSPHERICS/components/trinary_devices/filter.dm

@@ -6,9 +6,14 @@
 
 	name = "Gas filter"
 	
+	use_power = 1
+	idle_power_usage = 150		//internal circuitry, friction losses and stuff
+	active_power_usage = 7500	//This also doubles as a measure of how powerful the filter is, in Watts. 7500 W ~ 10 HP
+
 	var/temp = null // -- TLE
 
-	var/target_pressure = ONE_ATMOSPHERE
+	var/max_flow_rate = 200	//L/s
+	var/set_flow_rate = 200
 
 	var/filter_type = 0
 /*
@@ -30,12 +35,11 @@ Filter types:
 	if(frequency)
 		radio_connection = radio_controller.add_object(src, frequency, RADIO_ATMOSIA)
 
-/* I don't know why this is here, but it's ugly, so I'm disabling it
 /obj/machinery/atmospherics/trinary/filter/New()
 	..()
 	if(radio_controller)
 		initialize()
-*/
+
 /obj/machinery/atmospherics/trinary/filter/update_icon()
 	if(istype(src, /obj/machinery/atmospherics/trinary/filter/m_filter))
 		icon_state = "m"
@@ -77,71 +81,51 @@ Filter types:
 
 /obj/machinery/atmospherics/trinary/filter/process()
 	..()
-	if(!on)
-		return 0
+	if((stat & (NOPOWER|BROKEN)) || !on)
+		update_use_power(0)	//usually we get here because a player turned a pump off - definitely want to update.
+		last_flow_rate = 0
+		return
 	
-	var/output_starting_pressure = air3.return_pressure()
+	//Figure out the amount of moles to transfer
+	var/transfer_moles = (set_flow_rate/air1.volume)*air1.total_moles
 	
-	if(output_starting_pressure >= target_pressure || air2.return_pressure() >= target_pressure )
-		//No need to mix if target is already full!
-		return 1
-
-	//Calculate necessary moles to transfer using PV=nRT
-
-	var/pressure_delta = target_pressure - output_starting_pressure
-	var/transfer_moles
-
-	if(air1.temperature > 0)
-		transfer_moles = pressure_delta*air3.volume/(air1.temperature * R_IDEAL_GAS_EQUATION)
-
-	//Actually transfer the gas
-
-	if(transfer_moles > 0)
-		var/datum/gas_mixture/removed = air1.remove(transfer_moles)
-
-		if(!removed)
-			return
-		var/datum/gas_mixture/filtered_out = new
-		filtered_out.temperature = removed.temperature
+	var/power_draw = -1
+	if (transfer_moles > 0)
 		
+		var/list/filtered_out
 		switch(filter_type)
 			if(0) //removing hydrocarbons
-				filtered_out.gas["phoron"] = removed.gas["phoron"]
-				removed.gas["phoron"] = 0
-
-				filtered_out.gas["oxygen_agent_b"] = removed.gas["oxygen_agent_b"]
-				removed.gas["oxygen_agent_b"] = 0
-
+				filtered_out = list("phoron", "oxygen_agent_b")
 			if(1) //removing O2
-				filtered_out.gas["oxygen"] = removed.gas["oxygen"]
-				removed.gas["oxygen"] = 0
-
+				filtered_out = list("oxygen")
 			if(2) //removing N2
-				filtered_out.gas["nitrogen"] = removed.gas["nitrogen"]
-				removed.gas["nitrogen"] = 0
-
+				filtered_out = list("nitrogen")
 			if(3) //removing CO2
-				filtered_out.gas["carbon_dioxide"] = removed.gas["carbon_dioxide"]
-				removed.gas["carbon_dioxide"] = 0
-
+				filtered_out = list("carbon_dioxide")
 			if(4)//removing N2O
-				filtered_out.gas["sleeping_agent"] = removed.gas["sleeping_agent"]
-				removed.gas["sleeping_agent"] = 0
-
+				filtered_out = list("sleeping_agent")
 			else
 				filtered_out = null
 		
-		air2.merge(filtered_out)
-		air3.merge(removed)
+		power_draw = filter_gas(filtered_out, air1, air2, air3, transfer_moles, active_power_usage)
 		
-	if(network2)
-		network2.update = 1
+		if(network2)
+			network2.update = 1
 
-	if(network3)
-		network3.update = 1
+		if(network3)
+			network3.update = 1
 
-	if(network1)
-		network1.update = 1
+		if(network1)
+			network1.update = 1
+
+	if (power_draw < 0)
+		//update_use_power(0)
+		use_power = 0	//don't force update - easier on CPU
+		last_flow_rate = 0
+	else if (power_draw > 0)
+		handle_power_draw(power_draw)
+	else
+		handle_power_draw(idle_power_usage)
 	
 	return 1
 
@@ -205,8 +189,10 @@ Filter types:
 			<A href='?src=\ref[src];filterset=3'>Carbon Dioxide</A><BR>
 			<A href='?src=\ref[src];filterset=4'>Nitrous Oxide</A><BR>
 			<A href='?src=\ref[src];filterset=-1'>Nothing</A><BR>
-			<HR><B>Desirable output pressure:</B>
-			[src.target_pressure]kPa | <a href='?src=\ref[src];set_press=1'>Change</a>
+			<HR>
+			<B>Desirable input flow rate:</B>
+			[src.set_flow_rate]L/s | <a href='?src=\ref[src];set_flow_rate=1'>Change</a><BR>
+			<B>Flow rate:</B>[last_flow_rate]L/s
 			"}
 /*
 		user << browse("<HEAD><TITLE>[src.name] control</TITLE></HEAD>[dat]","window=atmo_filter")
@@ -231,9 +217,9 @@ Filter types:
 		src.filter_type = text2num(href_list["filterset"])
 	if (href_list["temp"])
 		src.temp = null
-	if(href_list["set_press"])
-		var/new_pressure = input(usr,"Enter new output pressure (0-4500kPa)","Pressure control",src.target_pressure) as num
-		src.target_pressure = max(0, min(4500, new_pressure))
+	if(href_list["set_flow_rate"])
+		var/new_pressure = input(usr,"Enter new flow rate (0-[max_flow_rate]L/s)","Flow Rate Control",src.set_flow_rate) as num
+		src.set_flow_rate = max(0, min(max_flow_rate, new_pressure))
 	if(href_list["power"])
 		on=!on
 	src.update_icon()

code/ATMOSPHERICS/components/unary/vent_pump.dm

@@ -177,13 +177,12 @@
 		//update_use_power(0)
 		use_power = 0	//don't force update - easier on CPU
 	if (power_draw > 0)
-		handle_pump_power_draw(power_draw)
+		handle_power_draw(power_draw)
 		last_power_draw = power_draw
 	else
-		handle_pump_power_draw(idle_power_usage)
+		handle_power_draw(idle_power_usage)
 		last_power_draw = idle_power_usage
 
-	
 	return 1
 
 /obj/machinery/atmospherics/unary/vent_pump/proc/get_pressure_delta(datum/gas_mixture/environment)

code/ATMOSPHERICS/components/unary/vent_scrubber.dm

@@ -140,10 +140,10 @@
 		use_power = 0	//don't force update. Sure, we will continue to use power even though we're not pumping anything, but it is easier on the CPU
 	else if (power_draw > 0)
 		//last_power_draw = power_draw
-		handle_pump_power_draw(power_draw)
+		handle_power_draw(power_draw)
 	else
 		//last_power_draw = idle_power_usage
-		handle_pump_power_draw(idle_power_usage)
+		handle_power_draw(idle_power_usage)
 	
 	if(network)
 		network.update = 1