Add animation for water

mods/default/README.txt

@@ -68,3 +68,6 @@ VanessaE's animated torches (WTFPL):
   default_torch_on_floor_animated.png
   default_torch_on_floor.png
 
+RealBadAngel's animated water (WTFPL):
+  default_water_source_animated.png
+  default_water_flowing_animated.png

mods/default/init.lua

@@ -997,8 +997,16 @@ minetest.register_node("default:water_flowing", {
 	drawtype = "flowingliquid",
 	tiles = {"default_water.png"},
 	special_tiles = {
-		{name="default_water.png", backface_culling=false},
-		{name="default_water.png", backface_culling=true},
+		{
+			image="default_water_flowing_animated.png",
+			backface_culling=false,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
+		{
+			image="default_water_flowing_animated.png",
+			backface_culling=true,
+			animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=0.8}
+		},
 	},
 	alpha = WATER_ALPHA,
 	paramtype = "light",
@@ -1018,7 +1026,9 @@ minetest.register_node("default:water_source", {
 	description = "Water Source",
 	inventory_image = minetest.inventorycube("default_water.png"),
 	drawtype = "liquid",
-	tiles = {"default_water.png"},
+	tiles = {
+		{name="default_water_source_animated.png", animation={type="vertical_frames", aspect_w=16, aspect_h=16, length=2.0}}
+	},
 	special_tiles = {
 		-- New-style water source material (mostly unused)
 		{name="default_water.png", backface_culling=false},