Dynamic water

mods/pmb_nodes/pmb_nodes_surface/api.lua

@@ -0,0 +1,70 @@
+pmb_fluid_api = {}
+
+pmb_fluid_api.box = { -0.5, -0.5, -0.5, 0.5, 0.5, 0.5 }
+
+function pmb_fluid_api.register_fluid(name, nodedef)
+    nodedef.groups.dynamic_fluid = 1
+    nodedef.leveled = 64
+
+    nodedef.drawtype = "nodebox"
+    nodedef.node_box = {
+        type = "leveled",
+        fixed = pmb_fluid_api.box,
+    }
+
+    minetest.register_node(name, nodedef)
+end
+
+local flows = {
+    vector.new(1, 0, 0),
+    vector.new(-1, 0, 0),
+    vector.new(0, 0, 1),
+    vector.new(0, 0, -1),
+}
+
+function pmb_fluid_api.flow(pos, to_name)
+    local node = minetest.get_node(pos)
+
+    local flow = vector.new(0, -1, 0)
+    local flow_pos = vector.add(flow, pos)
+    local flow_node = minetest.get_node(flow_pos)
+    if flow_node.name == to_name or flow_node.name == "air" then
+        minetest.set_node(flow_pos, node)
+        minetest.set_node(pos, flow_node)
+        return
+    end
+    local offset = math.random(4)
+    for i = 1, 4 do
+        flow = flows[(offset + i) % 4 + 1]
+        flow_pos = vector.add(flow, pos)
+        flow_node = minetest.get_node(flow_pos)
+        if flow_node.name == to_name or flow_node.name == "air" then
+            minetest.set_node(flow_pos, node)
+            minetest.set_node(pos, flow_node)
+            return
+        end
+    end
+end
+
+function pmb_fluid_api.flow_maybe(chance)
+    return function(pos)
+        if math.random() < chance then
+            pmb_fluid_api.flow(pos)
+        end
+    end
+end
+
+function pmb_fluid_api.register_flow(from_name, to_name)
+    local nodedef = minetest.registered_nodes[from_name]
+
+    minetest.register_abm({
+        label = "Fluid flow "..from_name,
+        nodenames = { from_name },
+        neighbors = { to_name },
+        interval = (.5 + nodedef.liquid_viscosity),
+        chance = 1,
+        action = function(pos)
+            minetest.after(0, pmb_fluid_api.flow, pos, to_name)
+        end
+    })
+end

mods/pmb_nodes/pmb_nodes_surface/init.lua

@@ -1,8 +1,13 @@
+local mod_name = minetest.get_current_modname()
+local mod_path = minetest.get_modpath(mod_name)
+
+dofile(mod_path .. DIR_DELIM .. "api.lua")
+
 pmb_nodes_surface = {}
 
 minetest.register_node('pmb_nodes_surface:water_source', {
   description = 'Water Source',
-  groups = { water_source = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 0 },
+  groups = { water_source = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 0, dynamic_source=1 },
 
   tiles = { {
       name = 'pmb_surface_water.png^[opacity:190',
@@ -21,13 +26,16 @@ minetest.register_node('pmb_nodes_surface:water_source', {
   buildable_to = true,
   liquidtype = "source",
   liquid_viscosity = 0,
+  liquid_renewable = false,
   liquid_range = 8,
   liquid_alternative_source = "pmb_nodes_surface:water_source",
   liquid_alternative_flowing = "pmb_nodes_surface:water_flowing",
+  --_on_node_update = pmb_fluid_api.flow_maybe(0.5)
 })
+
 minetest.register_node('pmb_nodes_surface:water_flowing', {
-  description = 'Water Source',
-  groups = { water_flowing = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 1 },
+  description = 'Water Flowing',
+  groups = { water_flowing = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 1, dynamic_flow=1 },
 
   special_tiles = {
     {
@@ -55,17 +63,17 @@ minetest.register_node('pmb_nodes_surface:water_flowing', {
   buildable_to = true,
 	liquidtype = "flowing",
   liquid_viscosity = 0,
+  liquid_renewable = false,
   -- liquid_range = 8,
   liquid_alternative_source = "pmb_nodes_surface:water_source",
   liquid_alternative_flowing = "pmb_nodes_surface:water_flowing",
 })
 
-
-
+pmb_fluid_api.register_flow("pmb_nodes_surface:water_source", "pmb_nodes_surface:water_flowing")
 
 
 minetest.register_node('pmb_nodes_surface:river_water_source', {
-  description = 'Water Source',
+  description = 'River Water Source',
   groups = { water_source = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 0 },
 
   tiles = { {
@@ -88,7 +96,7 @@ minetest.register_node('pmb_nodes_surface:river_water_source', {
   liquid_range = 8,
 })
 minetest.register_node('pmb_nodes_surface:riverwater_flowing', {
-  description = 'Water Source',
+  description = 'River Water Flowing',
   groups = { water_flowing = 1, oddly_breakable_by_hand = 3, liquid = 1, water = 1, flowing = 1 },
 
   special_tiles = {
@@ -156,7 +164,7 @@ minetest.register_node('pmb_nodes_surface:lava_source', {
 })
 
 minetest.register_node('pmb_nodes_surface:lava_flowing', {
-  description = 'Water Source',
+  description = 'Lava Flowing',
   groups = { lava_flowing = 1, oddly_breakable_by_hand = 3, liquid = 1, lava = 1, flowing = 1 },
 
   special_tiles = {
@@ -191,3 +199,5 @@ minetest.register_node('pmb_nodes_surface:lava_flowing', {
   liquid_alternative_source = "pmb_nodes_surface:lava_source",
   liquid_alternative_flowing = "pmb_nodes_surface:lava_flowing",
 })
+
+pmb_fluid_api.register_flow("pmb_nodes_surface:lava_source", "pmb_nodes_surface:lava_flowing")

mods/pmb_nodes/pmb_nodes_surface/mod.conf

@@ -1,2 +1,3 @@
 name = pmb_nodes_surface
 author = PMB team
+depends = pmb_node_update