More explicit argument list for INVOKE_WCB callbacks

[freeglut] / src / fg_internal.h

diff --git a/src/fg_internal.h b/src/fg_internal.h
index 7afb400..93ea3bc 100644 (file)
--- a/src/fg_internal.h
+++ b/src/fg_internal.h
@@ -713,7 +713,13 @@ do                                                             \
  * typedef void (* FGCBEntryUC)( int, FGCBUserData );
  * #define EXPAND_WCB_SUB_Entry(args, userData) EXPAND_WCB_ONE_OR_MORE(args, userData)
  */
+#define FG_COMPILER_SUPPORTS_VA_ARGS
+#ifdef FG_COMPILER_SUPPORTS_VA_ARGS
 #define EXPAND_WCB_UNPARAN(...) __VA_ARGS__
+#else
+#error "Compiler does not support varadic argument macros"
+#endif
+
 #define EXPAND_WCB_ZERO(args, userData) ( userData )
 #define EXPAND_WCB_ONE_OR_MORE(args, userData) ( EXPAND_WCB_UNPARAN args, userData )
 
@@ -731,9 +737,10 @@ do                                                             \
  *
  * The callback is invoked as:
  *
- *    callback( arg_list );
+ *    callback( arg_list, userData );
  *
- * ...so the parentheses are REQUIRED in the {arg_list}.
+ * ...where userData is added to the arg_list, but the parentheses 
+ * are REQUIRED in the {arg_list}.
  *
  * NOTE that it does a sanity-check and also sets the
  * current window.
@@ -748,7 +755,7 @@ do                                            \
         FGCB ## cbname ## UC func = (FGCB ## cbname ## UC)(FETCH_WCB( window, cbname )); \
         FGCBUserData userData = FETCH_USER_DATA_WCB( window, cbname ); \
         fgSetWindow( &window );               \
-        func EXPAND_WCB( cbname )( arg_list, userData ); \
+               func EXPAND_WCB( cbname )( arg_list, userData ); \
     }                                         \
 } while( 0 )
 #else
@@ -759,7 +766,7 @@ do                                            \
     {                                         \
         fgSetWindow( &window );               \
         FGCBUserData userData = FETCH_USER_DATA_WCB( window, cbname ); \
-        ((FGCB ## cbname ## UC)FETCH_WCB( window, cbname )) EXPAND_WCB( cbname )( arg_list, userData ); \
+               ((FGCB ## cbname ## UC)FETCH_WCB( window, cbname )) EXPAND_WCB( cbname )( arg_list, userData ); \
     }                                         \
 } while( 0 )
 #endif