animatch: fix to run on wayland w/o Xwayland, and enable bwrap sandbox

hosts/common/programs/animatch.nix

@@ -1,10 +1,41 @@
-{ ... }:
+# debug with:
+# - `animatch --debug`
+# - `gdb animatch`
+# try:
+# - `animatch --fullscreen`
+# - `animatch --windowed`
+# the other config options (e.g. verbose logging -- which doesn't seem to do anything) have to be configured via .ini file
+# ```ini
+# # ~/.config/Holy Pangolin/Animatch/SuperDerpy.ini
+# [SuperDerpy]
+# debug=1
+# disableTouch=1
+# [game]
+# verbose=1
+# ```
+{ pkgs, ... }:
 {
   sane.programs.animatch = {
+    packageUnwrapped = with pkgs; animatch.override {
+      # allegro has no native wayland support, and so by default crashes when run without Xwayland.
+      # enable the allegro SDL backend, and achieve Wayland support via SDL's Wayland support.
+      # TODO: see about upstreaming this to nixpkgs?
+      allegro5 = allegro5.overrideAttrs (upstream: {
+        buildInputs = upstream.buildInputs ++ [
+          SDL2
+        ];
+        cmakeFlags = upstream.cmakeFlags ++ [
+          "-DALLEGRO_SDL=on"
+        ];
+      });
+    };
+    sandbox.method = "bwrap";
     persist.byStore.plaintext = [
       # game progress
+      # i'm not sure which of these is correct. i think it might actually use both of these, in different places.
+      # but it's probably the ~/.config one?
       ".config/Holy Pangolin/Animatch"
-      ".local/share/Holy Pangolin/Animatch"  # i think this one might be wrong
+      ".local/share/Holy Pangolin/Animatch"
     ];
   };
 }