Simple deco: Allow setting param2 value on placement

Schematics can already be placed with a param2 value, but not
simple 1-node plant decorations of the simple type.

This adds a `param2` field to the simple deco type that is
checked to be between 0 and 255, and put to the placed node
at mapgen.

This can be used to put a degrotate value in, or e.g. a fill
value for leveltype nodes, or a place_param2 value at mapgen
placement, or vary the shape of meshoptions plantlike drawtype.

1 files changed, 7 insertions, 0 deletions

diff --git a/src/script/lua_api/l_mapgen.cpp b/src/script/lua_api/l_mapgen.cpp
index da8e71cdc..cefea3da9 100644
--- a/src/script/lua_api/l_mapgen.cpp
+++ b/src/script/lua_api/l_mapgen.cpp
@@ -975,6 +975,7 @@ bool read_deco_simple(lua_State *L, DecoSimple *deco)
 
 	deco->deco_height     = getintfield_default(L, index, "height", 1);
 	deco->deco_height_max = getintfield_default(L, index, "height_max", 0);
+	deco->deco_param2     = getintfield_default(L, index, "param2", 0);
 
 	if (deco->deco_height <= 0) {
 		errorstream << "register_decoration: simple decoration height"
@@ -990,6 +991,12 @@ bool read_deco_simple(lua_State *L, DecoSimple *deco)
 		return false;
 	}
 
+	if ((deco->deco_param2 < 0) || (deco->deco_param2 > 255)) {
+		errorstream << "register_decoration: param2 out of bounds (0-255)"
+			<< std::endl;
+		return false;
+	}
+
 	return true;
 }