Ores: Add stratum ore (#6352)

Creates a single undulating ore stratum that is continuous across mapchunk
borders and horizontally spans the world.
Due to being continuous is ideal for creating bands of alternative stone
type running through cliffs and mountains, or underground layers.

Add missing documentation of 'ore_param2' parameter.

1 files changed, 10 insertions, 0 deletions

diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index 0875e2c95..c2b256228 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -73,6 +73,7 @@ struct EnumString ModApiMapgen::es_OreType[] =
 	{ORE_PUFF,    "puff"},
 	{ORE_BLOB,    "blob"},
 	{ORE_VEIN,    "vein"},
+	{ORE_STRATUM, "stratum"},
 	{0, NULL},
 };
 
@@ -1149,6 +1150,15 @@ int ModApiMapgen::l_register_ore(lua_State *L)
 
 			break;
 		}
+		case ORE_STRATUM: {
+			OreStratum *orestratum = (OreStratum *)ore;
+
+			lua_getfield(L, index, "np_stratum_thickness");
+			read_noiseparams(L, -1, &orestratum->np_stratum_thickness);
+			lua_pop(L, 1);
+
+			break;
+		}
 		default:
 			break;
 	}