1 files changed, 41 insertions, 2 deletions
diff --git a/src/doom/m_menu.c b/src/doom/m_menu.c
index e54ac7ff..b0eeee06 100644
--- a/src/doom/m_menu.c
+++ b/src/doom/m_menu.c
@@ -132,6 +132,7 @@ char			savegamestrings[10][SAVESTRINGSIZE];
 
 char	endstring[160];
 
+static boolean opldev;
 
 //
 // MENU TYPEDEFS
@@ -1887,6 +1888,39 @@ void M_StartControlPanel (void)
     itemOn = currentMenu->lastOn;   // JDC
 }
 
+// Display OPL debug messages - hack for GENMIDI development.
+
+static void M_DrawOPLDev(void)
+{
+    extern void I_OPL_DevMessages(char *);
+    char debug[1024];
+    char *curr, *p;
+    int line;
+
+    I_OPL_DevMessages(debug);
+    curr = debug;
+    line = 0;
+
+    for (;;)
+    {
+        p = strchr(curr, '\n');
+
+        if (p != NULL)
+        {
+            *p = '\0';
+        }
+
+        M_WriteText(0, line * 8, curr);
+        ++line;
+
+        if (p == NULL)
+        {
+            break;
+        }
+
+        curr = p + 1;
+    }
+}
 
 //
 // M_Drawer
@@ -1938,6 +1972,11 @@ void M_Drawer (void)
 	return;
     }
 
+    if (opldev)
+    {
+        M_DrawOPLDev();
+    }
+
     if (!menuactive)
 	return;
 
@@ -1965,7 +2004,6 @@ void M_Drawer (void)
     V_DrawPatchDirect(x + SKULLXOFF, currentMenu->y - 5 + itemOn*LINEHEIGHT,
 		      W_CacheLumpName(DEH_String(skullName[whichSkull]),
 				      PU_CACHE));
-
 }
 
 
@@ -2046,6 +2084,7 @@ void M_Init (void)
       default:
 	break;
     }
-    
+
+    opldev = M_CheckParm("-opldev") > 0;
 }