Fire: Move flame extinguishing to separate faster ABM

Add extinguish sounds (from default mod lavacooling)
'disable fire' setting extinguishes fire quickly using a dedicated ABM
'disable fire' also disables all other ABMs
Simplify flammable node removal ABM
Speed up node ignition, it was too slow
Add 'sunlight propagates = true' and 'paramtype = "light" to flame
Balance fire sounds' gain

mods/fire/init.lua

@@ -16,11 +16,13 @@ minetest.register_node("fire:basic_flame", {
 			aspect_w = 16, aspect_h = 16, length = 1},
 	}},
 	inventory_image = "fire_basic_flame.png",
+	paramtype = "light",
 	light_source = 14,
 	groups = {igniter = 2, dig_immediate = 3},
 	drop = '',
 	walkable = false,
 	buildable_to = true,
+	sunlight_propagates = true,
 	damage_per_second = 4,
 
 	on_construct = function(pos)
@@ -31,21 +33,13 @@ minetest.register_node("fire:basic_flame", {
 		minetest.after(0, fire.on_flame_remove_at, pos)
 	end,
 
-	-- unaffected by explosions
-	on_blast = function() end,
+	on_blast = function() end, -- unaffected by explosions
 })
 
 
--- Fire sounds table
--- key: position hash of low corner of area
--- value: {handle=sound handle, name=sound name}
-fire.sounds = {}
-
-
 -- Get sound area of position
 
--- size of sound areas
-fire.D = 6
+fire.D = 6 -- size of sound areas
 
 function fire.get_area_p0p1(pos)
 	local p0 = {
@@ -62,6 +56,12 @@ function fire.get_area_p0p1(pos)
 end
 
 
+-- Fire sounds table
+-- key: position hash of low corner of area
+-- value: {handle=sound handle, name=sound name}
+fire.sounds = {}
+
+
 -- Update fire sounds in sound area of position
 
 function fire.update_sounds_around(pos)
@@ -73,9 +73,9 @@ function fire.update_sounds_around(pos)
 	local should_have_sound = (#flames_p > 0)
 	local wanted_sound = nil
 	if #flames_p >= 9 then
-		wanted_sound = {name = "fire_large", gain = 1.5}
+		wanted_sound = {name = "fire_large", gain = 0.7}
 	elseif #flames_p > 0 then
-		wanted_sound = {name = "fire_small", gain = 1.5}
+		wanted_sound = {name = "fire_small", gain = 0.9}
 	end
 	local p0_hash = minetest.hash_node_position(p0)
 	local sound = fire.sounds[p0_hash]
@@ -125,33 +125,84 @@ end
 -- Detect nearby extinguishing nodes
 
 function fire.flame_should_extinguish(pos)
-	if minetest.setting_getbool("disable_fire") then return true end
-	--return minetest.find_node_near(pos, 1, {"group:puts_out_fire"})
-	local p0 = {x = pos.x - 1, y = pos.y, z = pos.z - 1}
-	local p1 = {x = pos.x + 1, y = pos.y + 1, z = pos.z + 1}
-	local ps = minetest.find_nodes_in_area(p0, p1, {"group:puts_out_fire"})
-	return (#ps ~= 0)
+	return minetest.find_node_near(pos, 1, {"group:puts_out_fire"})
 end
 
 
--- Ignite neighboring nodes
+-- Enable ABMs according to 'disable fire' setting
 
-minetest.register_abm({
-	nodenames = {"group:flammable"},
-	neighbors = {"group:igniter"},
-	interval = 7,
-	chance = 32,
-	action = function(p0, node, _, _)
-		-- If there is water or stuff like that around flame, don't ignite
-		if fire.flame_should_extinguish(p0) then
-			return
-		end
-		local p = fire.find_pos_for_flame_around(p0)
-		if p then
-			minetest.set_node(p, {name = "fire:basic_flame"})
-		end
-	end,
-})
+if minetest.setting_getbool("disable_fire") then
+
+	-- Extinguish flames quickly with dedicated ABM
+
+	minetest.register_abm({
+		nodenames = {"fire:basic_flame"},
+		interval = 3,
+		chance = 2,
+		action = function(p0, node, _, _)
+			minetest.remove_node(p0)
+		end,
+	})
+
+else
+
+	-- Extinguish flames quickly with water, snow, ice
+
+	minetest.register_abm({
+		nodenames = {"fire:basic_flame"},
+		neighbors = {"group:puts_out_fire"},
+		interval = 3,
+		chance = 2,
+		action = function(p0, node, _, _)
+			minetest.remove_node(p0)
+			minetest.sound_play("fire_extinguish_flame",
+				{pos = p0, max_hear_distance = 16, gain = 0.25})
+		end,
+	})
+
+	-- Ignite neighboring nodes
+
+	minetest.register_abm({
+		nodenames = {"group:flammable"},
+		neighbors = {"group:igniter"},
+		interval = 7,
+		chance = 16,
+		action = function(p0, node, _, _)
+			-- If there is water or stuff like that around node, don't ignite
+			if fire.flame_should_extinguish(p0) then
+				return
+			end
+			local p = fire.find_pos_for_flame_around(p0)
+			if p then
+				minetest.set_node(p, {name = "fire:basic_flame"})
+			end
+		end,
+	})
+
+	-- Remove flames and flammable nodes
+
+	minetest.register_abm({
+		nodenames = {"fire:basic_flame"},
+		interval = 5,
+		chance = 16,
+		action = function(p0, node, _, _)
+			-- If there are no flammable nodes around flame, remove flame
+			if not minetest.find_node_near(p0, 1, {"group:flammable"}) then
+				minetest.remove_node(p0)
+				return
+			end
+			if math.random(1, 4) == 1 then
+				-- remove flammable nodes around flame
+				local p = minetest.find_node_near(p0, 1, {"group:flammable"})
+				if p then
+					minetest.remove_node(p)
+					nodeupdate(p)
+				end
+			end
+		end,
+	})
+
+end
 
 
 -- Rarely ignite things from far
@@ -184,44 +235,3 @@ minetest.register_abm({
 	end,
 })
 --]]
-
-
--- Remove flammable nodes and flame
-
-minetest.register_abm({
-	nodenames = {"fire:basic_flame"},
-	interval = 5,
-	chance = 16,
-	action = function(p0, node, _, _)
-		-- If there is water or stuff like that around flame, remove flame
-		if fire.flame_should_extinguish(p0) then
-			minetest.remove_node(p0)
-			return
-		end
-		-- Make the following things rarer
-		if math.random(1, 3) == 1 then
-			return
-		end
-		-- If there are no flammable nodes around flame, remove flame
-		if not minetest.find_node_near(p0, 1, {"group:flammable"}) then
-			minetest.remove_node(p0)
-			return
-		end
-		if math.random(1, 4) == 1 then
-			-- remove a flammable node around flame
-			local p = minetest.find_node_near(p0, 1, {"group:flammable"})
-			if p then
-				-- If there is water or stuff like that around flame, don't remove
-				if fire.flame_should_extinguish(p0) then
-					return
-				end
-				minetest.remove_node(p)
-				nodeupdate(p)
-			end
-		else
-			-- remove flame
-			minetest.remove_node(p0)
-		end
-	end,
-})
-