From: José Fonseca <jfonseca@vmware.com>
Date: Thu, 16 Jul 2009 18:20:25 +0000 (+0100)
Subject: mesa: Fix logbase2.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=d4e6df9ab6e7b707278e3739abee776418c6f527;p=mesa.git

mesa: Fix logbase2.

It was providing 1 too many for non power two values.
---

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 22685bd5d95..15f84b66382 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -237,14 +237,12 @@ do_memcpy(void *dest, const void *src, size_t n)
 }
 
 
-static int
-logbase2(int n)
+static INLINE unsigned
+logbase2(unsigned n)
 {
-   GLint i = 1, log2 = 0;
-   while (n > i) {
-      i *= 2;
-      log2++;
-   }
+   unsigned log2 = 0;
+   while (n >>= 1)
+      ++log2;
    return log2;
 }