demo/blocky: fix flat markers for vanilla

Author: jmtd

demo/blocky.py

@@ -31,13 +31,16 @@
     out.patches[name] = gr
 
     # generate a texture entry
-    editor.simple(name, out.patches[name])
+    editor.simple(name, ot.patches[name])
 
     # generate a flat
     name = "FOLOR{:03d}".format(i)
     flat = Flat()
     flat.load_raw(bytes([i])*4096)
     out.flats[name] = flat
 
+# fix flats in vanilla
+out.flats.prefix='FF*_START'
+
 out.txdefs = editor.to_lumps()
 out.to_file('out.wad')