From 94bf2d48e19b86a4cfa4ff3bf3da97967f8a2793 Mon Sep 17 00:00:00 2001
From: Brian Paul <brianp@vmware.com>
Date: Sat, 7 Jan 2012 14:16:27 -0700
Subject: [PATCH] util: add debug_warn_once() macro

Emits a warning message, but only once to avoid tons of repeated warnings.
---
 src/gallium/auxiliary/util/u_debug.h | 19 +++++++++++++++++++
 1 file changed, 19 insertions(+)

diff --git a/src/gallium/auxiliary/util/u_debug.h b/src/gallium/auxiliary/util/u_debug.h
index cbea3583037..ed19cda05a2 100644
--- a/src/gallium/auxiliary/util/u_debug.h
+++ b/src/gallium/auxiliary/util/u_debug.h
@@ -214,6 +214,25 @@ void _debug_assert_fail(const char *expr,
 #endif
 
 
+/**
+ * Emit a warning message, but only once.
+ */
+#ifdef DEBUG
+#define debug_warn_once(__msg) \
+   do { \
+      static bool warned = FALSE; \
+      if (!warned) { \
+         _debug_printf("%s:%u:%s: one time warning: %s\n", \
+                       __FILE__, __LINE__, __FUNCTION__, __msg); \
+         warned = TRUE; \
+      } \
+   } while (0)
+#else
+#define debug_warn_once(__msg) \
+   ((void)0) 
+#endif
+
+
 /**
  * Output an error message. Not muted on release version.
  */