Mesa (master): mesa st: Move logbase2 function to util/u_math.h

[Patrice Mandin]

Module: Mesa
Branch: master
Commit: c1785c19ca0716a7e85777242949a0c33e28988f
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=c1785c19ca0716a7e85777242949a0c33e28988f

Author: Patrice Mandin <patmandin at gmail.com>
Date:   Sat Aug  1 11:03:30 2009 +0200

mesa st: Move logbase2 function to util/u_math.h

---

 src/gallium/auxiliary/util/u_math.h    |   23 ++++++++++++++++++-----
 src/mesa/state_tracker/st_cb_texture.c |   17 ++++-------------
 2 files changed, 22 insertions(+), 18 deletions(-)

diff --git a/src/gallium/auxiliary/util/u_math.h b/src/gallium/auxiliary/util/u_math.h
index e5003af..30e6e2f 100644
--- a/src/gallium/auxiliary/util/u_math.h
+++ b/src/gallium/auxiliary/util/u_math.h
@@ -216,23 +216,23 @@ util_fast_exp2(float x)
    int32_t ipart;
    float fpart, mpart;
    union fi epart;
-   
+
    if(x > 129.00000f)
       return 3.402823466e+38f;
-   
+
    if(x < -126.99999f)
       return 0.0f;
 
    ipart = (int32_t) x;
    fpart = x - (float) ipart;
-   
+
    /* same as
     *   epart.f = (float) (1 << ipart)
     * but faster and without integer overflow for ipart > 31 */
    epart.i = (ipart + 127 ) << 23;
-   
+
    mpart = pow2_table[POW2_TABLE_OFFSET + (int)(fpart * POW2_TABLE_SCALE)];
-   
+
    return epart.f * mpart;
 }
 
@@ -409,6 +409,19 @@ float_to_ubyte(float f)
 }
 
 
+/**
+ * Calc log base 2
+ */
+static INLINE unsigned
+util_logbase2(unsigned n)
+{
+   unsigned log2 = 0;
+   while (n >>= 1)
+      ++log2;
+   return log2;
+}
+
+
 
 #define CLAMP( X, MIN, MAX )  ( (X)<(MIN) ? (MIN) : ((X)>(MAX) ? (MAX) : (X)) )
 
diff --git a/src/mesa/state_tracker/st_cb_texture.c b/src/mesa/state_tracker/st_cb_texture.c
index ee71c01..e8d7f70 100644
--- a/src/mesa/state_tracker/st_cb_texture.c
+++ b/src/mesa/state_tracker/st_cb_texture.c
@@ -59,6 +59,7 @@
 #include "util/u_tile.h"
 #include "util/u_blit.h"
 #include "util/u_surface.h"
+#include "util/u_math.h"
 
 
 #define DBG if (0) printf
@@ -237,16 +238,6 @@ do_memcpy(void *dest, const void *src, size_t n)
 }
 
 
-static INLINE unsigned
-logbase2(unsigned n)
-{
-   unsigned log2 = 0;
-   while (n >>= 1)
-      ++log2;
-   return log2;
-}
-
-
 /**
  * Return default texture usage bitmask for the given texture format.
  */
@@ -340,9 +331,9 @@ guess_and_alloc_texture(struct st_context *st,
       lastLevel = firstLevel;
    }
    else {
-      GLuint l2width = logbase2(width);
-      GLuint l2height = logbase2(height);
-      GLuint l2depth = logbase2(depth);
+      GLuint l2width = util_logbase2(width);
+      GLuint l2height = util_logbase2(height);
+      GLuint l2depth = util_logbase2(depth);
       lastLevel = firstLevel + MAX2(MAX2(l2width, l2height), l2depth);
    }