mesa: Fix logbase2.

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

1 files changed, 5 insertions, 7 deletions

diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index 22685bd5d9..15f84b6638 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;
 }