1 files changed, 10 insertions, 2 deletions

diff --git a/src/gba/gba.h b/src/gba/gba.h
index 2b28295..74b6942 100644
--- a/src/gba/gba.h
+++ b/src/gba/gba.h
@@ -510,10 +510,18 @@ typedef enum {
 } SoundChannel;
 
 inline u16
-sound_volume(SoundChannel channels, u8 volume) {
+sound_volume(SoundChannel channels, u8 volume, u8 pan) {
     volume = volume & 0x7;
     channels = channels & 0xF;
-    return volume | (volume << 0x4) | (channels << 0x8) | (channels << 0xC);
+    u16 right = volume | (channels << 0x8);
+    u16 left = (volume << 0x4) | (channels << 0xC);
+    if (pan == 1) {
+        return left;
+    }
+    if (pan == 2) {
+        return right;
+    }
+    return left | right;
 }
 
 // Sound Direct Sound master bits.