I found out what the actual issue was with saves — it wasn’t that
xScripts needed to be recompiled (although it helped load previous
saves from the Windows build on Steam), it was that Ruby 2.1 doesn’t
seem to work with the saves, @mathewv might have determined this when
selecting 2.2 as the minimum. I have Ruby 2.3 on my system, installed
through Homebrew, so that is what I selected for my particular build.
Using the kitchen sink plane shader for viewport effects, even
if only a small part of them are active, incurs great performance
loss on mobile, so split the rendering into multiple optional
passes which additionally use the blending hardware for faster
mixing (lerping).
Also, don't mirror the PingPong textures if the viewport effect
covers the entire screen area anyway.
Don't globally set float precision to mediump, only fragment
shaders need that and defining it for vertex shaders causes
tilemap cracks.
Also manually define low precision for variables that hold
color / alpha values.
This removes the static dependency on fluidsynth being present
at buildtime (even headers aren't needed anymore).
Even though midi is a default format for the RPG XP/VX series,
it has fallen more and more out of use, with VX Ace completely
abandoning it from the RTP and making ogg vorbis the de facto
standard. Midi support is kept for legacy reasons, but isn't
encouraged. On top of all this, fluidsynth together with glib
is a heavy dependency that often times won't even be used.
Making it optional at build time is an attempt to unify and
keep build config fragmentation low.
In RGSS3, fluidsynth / midi is not initialized at all by
default, but rather on demand when either a midi track is
played back or Audio.setup_midi is called.
