1 files changed, 35 insertions, 0 deletions
diff --git a/src/hexen/h2_main.c b/src/hexen/h2_main.c
index 66dc535e..23131e9b 100644
--- a/src/hexen/h2_main.c
+++ b/src/hexen/h2_main.c
@@ -186,6 +186,40 @@ static void D_SetDefaultSavePath(void)
     }
 }
 
+// The Mac version of the Hexen IWAD is different to the "normal" DOS
+// version - it doesn't include lumps used by the DOS DMX library.
+// This means that we can't do GUS or OPL emulation and need to apply
+// a workaround.
+static void AdjustForMacIWAD(void)
+{
+    boolean adjust_music = false;
+
+    switch (snd_musicdevice)
+    {
+        case SNDDEVICE_ADLIB:
+        case SNDDEVICE_SB:
+            adjust_music = W_CheckNumForName("GENMIDI") < 0;
+            break;
+
+        case SNDDEVICE_GUS:
+            adjust_music = W_CheckNumForName("DMXGUS") < 0;
+            break;
+
+        default:
+            break;
+    }
+
+    if (adjust_music)
+    {
+        printf("** Note: You appear to be using the Mac version of the Hexen\n"
+               "** IWAD file. This is missing the lumps required for OPL or\n"
+               "** GUS emulation. Your music configuration is being adjusted\n"
+               "** to a different setting that won't cause the game to "
+               "crash.\n");
+        snd_musicdevice = SNDDEVICE_GENMIDI;
+    }
+}
+
 //
 // D_GrabMouseCallback
 //
@@ -297,6 +331,7 @@ void D_DoomMain(void)
 
     D_AddFile(iwadfile);
     W_CheckCorrectIWAD(hexen);
+    AdjustForMacIWAD();
 
     HandleArgs();