Add MIDI controller pass-through support (#429)

* Add MIDI controller pass-through support and update nix devshell

Author: SilverLuke

flake.nix

@@ -68,6 +68,12 @@
       # `nix run github:PolyMeilex/Neothesia`
       default = inputs.self.outputs.packages.${system}.neothesia;
       neothesia = naersk.buildPackage {
+        nativeBuildInputs = [
+          pkgs.pkg-config
+        ];
+        buildInputs = [
+          pkgs.alsa-lib
+        ];
         meta.mainProgram = "neothesia";
         src = workspace;
       };
@@ -85,11 +91,38 @@
       };
     });
 
-    devShells = forAllSystems (system: pkgs: {
+    devShells = forAllSystems (system: pkgs: let
+      rustToolchain =
+        pkgs.rust-bin.nightly.latest.default.override
+        {extensions = ["rust-src" "rust-analyzer"];};
+
+      runtimeLibs = with pkgs; [
+        wayland
+        libxkbcommon
+        libGL
+        vulkan-loader
+        alsa-lib
+        libx11
+        libxcursor
+        libxrandr
+        libxi
+        ffmpeg_8.lib
+      ];
+    in {
       # `nix develop github:PolyMeilex/Neothesia`
       default = pkgs.mkShell {
-        # grab all build dependencies of all exposed packages
-        inputsFrom = pkgs.lib.attrValues inputs.self.packages.${system};
+        nativeBuildInputs = with pkgs; [
+          rustToolchain
+          pkg-config
+          ffmpeg_8.dev
+        ];
+        buildInputs = with pkgs; [
+          alsa-lib
+        ] ++ runtimeLibs;
+        shellHook = ''
+          export PKG_CONFIG_PATH="${pkgs.alsa-lib.dev}/lib/pkgconfig:${pkgs.ffmpeg_8.dev}/lib/pkgconfig:$PKG_CONFIG_PATH"
+          export LD_LIBRARY_PATH="${pkgs.lib.makeLibraryPath runtimeLibs}:$LD_LIBRARY_PATH"
+        '';
       };
     });
   };

neothesia/src/scene/freeplay/mod.rs

@@ -261,7 +261,7 @@ impl Scene for FreeplayScene {
         self.keyboard.user_midi_event(message);
         ctx.output_manager
             .connection()
-            .midi_event(0.into(), *message);
+            .midi_event(channel.into(), *message);
 
         if let MidiMessage::NoteOn { .. } = message {
             let start = self.keyboard.layout().range.start();

neothesia/src/scene/menu_scene/mod.rs

@@ -424,17 +424,14 @@ impl Scene for MenuScene {
         match message {
             MidiMessage::NoteOn { key, .. } => {
                 self.midi_input_state.note_on(key.as_int());
-                ctx.output_manager
-                    .connection()
-                    .midi_event(channel.into(), *message);
             }
             MidiMessage::NoteOff { key, .. } => {
                 self.midi_input_state.note_off(key.as_int());
-                ctx.output_manager
-                    .connection()
-                    .midi_event(channel.into(), *message);
             }
             _ => {}
         }
+        ctx.output_manager
+            .connection()
+            .midi_event(channel.into(), *message);
     }
 }