Mesa (master): mesa: add signbit() macro

[Brian Paul]

Module: Mesa
Branch: master
Commit: 14ca76646ad2140aba44ae7070b04019ce2b3da0
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=14ca76646ad2140aba44ae7070b04019ce2b3da0

Author: Brian Paul <brianp at vmware.com>
Date:   Mon Sep 24 13:20:33 2012 -0600

mesa: add signbit() macro

Reviewed-by: Matt Turner <mattst88 at gmail.com>

---

 src/mesa/main/imports.h |    7 +++++++
 1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 81da510..a78d679 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -145,6 +145,13 @@ static inline int isblank(int ch) { return ch == ' ' || ch == '\t'; }
 /*@}*/
 
 
+/*
+ * signbit() is a macro on Linux.  Not available on Windows.
+ */
+#ifndef signbit
+#define signbit(x) ((x) < 0.0f)
+#endif
+
 
 /** single-precision inverse square root */
 static inline float