From be1b8e5d6c6692010a3ec117035d9b218929e2b3 Mon Sep 17 00:00:00 2001
From: Brian <brian.paul@tungstengraphics.com>
Date: Mon, 10 Nov 2008 20:15:28 -0700
Subject: mesa: new _mesa_is_pow_two() function

---
 src/mesa/main/imports.h | 10 ++++++++++
 1 file changed, 10 insertions(+)

(limited to 'src/mesa/main/imports.h')

diff --git a/src/mesa/main/imports.h b/src/mesa/main/imports.h
index 89d0662f79..453151ce0b 100644
--- a/src/mesa/main/imports.h
+++ b/src/mesa/main/imports.h
@@ -462,6 +462,16 @@ static INLINE int iceil(float f)
 #endif
 
 
+/**
+ * Is x a power of two?
+ */
+static INLINE int
+_mesa_is_pow_two(int x)
+{
+   return !(x & (x - 1));
+}
+
+
 /***
  *** UNCLAMPED_FLOAT_TO_UBYTE: clamp float to [0,1] and map to ubyte in [0,255]
  *** CLAMPED_FLOAT_TO_UBYTE: map float known to be in [0,1] to ubyte in [0,255]
-- 
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