Adding The Custom Song

At the end of Creating A Chart we learned that .fnfc files were just .zip archives, so we can simply rename it and unzip it. Once we have thse files, we just need to put them in the correct spots in our mod folder!

• The manifest.json file can be discarded, our mod won't need it.
• The metadata.json and chart.json files need to go into the data/songs/<songid> folder, replacing <songid> with the internal name for our song.
• The OGG files need to go into songs/<songid>, again replacing <songid> with the internal name of our song.

We'll end up with something like this.

-mods
 |-myMod
   |-data
     |-songs
       |-mychart
         |-mychart-metadata.json
         |-mychart-chart.json
   |-songs
     |-mychart
       |-Inst.ogg
       |-Voices-bf.ogg
       |-Voices-pico.ogg
   |-_polymod_metadata.json

When the game starts, it queries the list of available songs by looking in the data/songs folder for <songid>/<songid>-metadata.json files, which it then uses to find the chart file and the requisite song files. Neat! But right now, if you boot up the game, this doesn't do anything. You'll see it mentioned in the logs with no complaints, but it's not playable in Story Mode or Freeplay, what gives?

source/funkin/play/song/Song.hx:579: Fetching song metadata for mychart
source/funkin/data/song/SongRegistry.hx:103:   Loaded entry data: Song(mychart)

The fix is simple; every song must be part of a Story Mode level to appear in Freeplay.