backend.midi: Make programs choose the right instrument through registry

bottlesdevs · Jan 19, 2025 · c3d90a3 · c3d90a3
1 parent 2196756
commit c3d90a3
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Showing 2 changed files with 14 additions and 0 deletions.
diff --git a/bottles/backend/utils/midi.py b/bottles/backend/utils/midi.py
@@ -68,3 +68,16 @@ def __start(self):
         sfid = synth.sfload(self.soundfont_path)
         synth.program_select(0, sfid, 0, 0)
         self.synth = synth
+
+    def register_as_current(self, config: BottleConfig):
+        """
+        Update Wine registry with this instance's ID, instructing
+        MIDI mapping to load the correct instrument set on program startup.
+        """
+        reg = Reg(config)
+        reg.add(
+            key="HKEY_CURRENT_USER\\Software\\Microsoft\\Windows\\CurrentVersion\\Multimedia\\MIDIMap",
+            value="CurrentInstrument",
+            data=f"#{self.id}",
+            value_type="REG_SZ",
+        )
diff --git a/bottles/backend/wine/executor.py b/bottles/backend/wine/executor.py
@@ -74,6 +74,7 @@ def __init__(
         self.fluidsynth = None
         if (soundfont_path := midi_soundfont) not in (None, ""):
             self.fluidsynth = FluidSynth.find_or_create(soundfont_path)
+            self.fluidsynth.register_as_current(config)
 
         # None = use global DXVK value
         if program_dxvk is not None: