remove loose variants.

rewrite some node registration code, removing the so far unused loose
nodes, and putting in place some data that outlines how they might be
implemented in the future.

mods/bg_terrain/node.lua

@@ -11,9 +11,17 @@ blockgame.register_node(modname .. ":stone", {
 	},
 	drop = modname .. ":cobblestone",
 })
-blockgame.reg_simple_node("cobblestone", "Cobblestone", {
+
-	cracky = 3,
+blockgame.register_node(modname .. ":cobblestone", {
-	stoney = 1,
+	description = "Cobblestone",
+	tiles = {
+		modname .. "_cobblestone.png",
+	},
+	groups = {
+		cracky = 3,
+		stoney = 1,
+	},
+	loose_variant = modname .. ":cobblestone_loose",
 })
 
 minetest.register_alias("mapgen_stone", modname .. ":stone")
@@ -25,18 +33,19 @@ blockgame.register_node(modname .. ":grass", {
 		modname .. "_grass.png",
 	},
 	groups = {
-		cracky = 3,
 		dirty = 1,
 	},
 	drop = modname .. ":dirt",
 })
 
-blockgame.reg_simple_node("dirt", "Dirt", {
+blockgame.register_node(modname .. ":dirt", {
-	cracky = 3,
+	description = "Dirt",
-	dirty = 1,
+	tiles = {
-	grassable = 1,
+		modname .. "_dirt.png",
+	},
+	groups = {
+		dirty = 1,
+		grassable = 1,
+	},
+	loose_variant = modname .. ":dirt_loose",
 })
-
-blockgame.register_loose_version(modname .. ":dirt")
-blockgame.register_loose_version(modname .. ":grass")
-blockgame.register_loose_version(modname .. ":cobblestone")