From 1a46dcc8a927dfb38ca1381e7b3dafb789f8257c Mon Sep 17 00:00:00 2001
From: Brian Paul <brian.paul@tungstengraphics.com>
Date: Fri, 22 Aug 2008 15:25:21 -0600
Subject: gallium: replace LOG2() macro with util_fast_log2() inline func

---
 src/gallium/auxiliary/tgsi/tgsi_sse2.c       |  8 ++++----
 src/gallium/drivers/softpipe/sp_context.c    |  3 +++
 src/gallium/drivers/softpipe/sp_tex_sample.c |  3 ++-
 src/gallium/include/pipe/p_util.h            | 15 ---------------
 4 files changed, 9 insertions(+), 20 deletions(-)

(limited to 'src')

diff --git a/src/gallium/auxiliary/tgsi/tgsi_sse2.c b/src/gallium/auxiliary/tgsi/tgsi_sse2.c
index e390607023..00ed4da450 100644
--- a/src/gallium/auxiliary/tgsi/tgsi_sse2.c
+++ b/src/gallium/auxiliary/tgsi/tgsi_sse2.c
@@ -713,10 +713,10 @@ lg24f(
 {
    const unsigned X = 0;
 
-   store[X + 0] = LOG2( store[X + 0] );
-   store[X + 1] = LOG2( store[X + 1] );
-   store[X + 2] = LOG2( store[X + 2] );
-   store[X + 3] = LOG2( store[X + 3] );
+   store[X + 0] = util_fast_log2( store[X + 0] );
+   store[X + 1] = util_fast_log2( store[X + 1] );
+   store[X + 2] = util_fast_log2( store[X + 2] );
+   store[X + 3] = util_fast_log2( store[X + 3] );
 }
 
 static void
diff --git a/src/gallium/drivers/softpipe/sp_context.c b/src/gallium/drivers/softpipe/sp_context.c
index 626c3a9d4e..9b1313bc83 100644
--- a/src/gallium/drivers/softpipe/sp_context.c
+++ b/src/gallium/drivers/softpipe/sp_context.c
@@ -33,6 +33,7 @@
 #include "pipe/p_defines.h"
 #include "pipe/p_inlines.h"
 #include "pipe/p_util.h"
+#include "util/u_math.h"
 #include "sp_clear.h"
 #include "sp_context.h"
 #include "sp_flush.h"
@@ -128,6 +129,8 @@ softpipe_create( struct pipe_screen *screen,
    struct softpipe_context *softpipe = CALLOC_STRUCT(softpipe_context);
    uint i;
 
+   util_init_math();
+
 #ifdef PIPE_ARCH_X86
    softpipe->use_sse = !debug_get_bool_option( "GALLIUM_NOSSE", FALSE );
 #else
diff --git a/src/gallium/drivers/softpipe/sp_tex_sample.c b/src/gallium/drivers/softpipe/sp_tex_sample.c
index 01f4d0ca81..d7680ffa81 100644
--- a/src/gallium/drivers/softpipe/sp_tex_sample.c
+++ b/src/gallium/drivers/softpipe/sp_tex_sample.c
@@ -41,6 +41,7 @@
 #include "pipe/p_defines.h"
 #include "pipe/p_util.h"
 #include "tgsi/tgsi_exec.h"
+#include "util/u_math.h"
 
 
 /*
@@ -499,7 +500,7 @@ compute_lambda(struct tgsi_sampler *sampler,
       rho = MAX2(rho, max);
    }
 
-   lambda = LOG2(rho);
+   lambda = util_fast_log2(rho);
    lambda += lodbias + sampler->state->lod_bias;
    lambda = CLAMP(lambda, sampler->state->min_lod, sampler->state->max_lod);
 
diff --git a/src/gallium/include/pipe/p_util.h b/src/gallium/include/pipe/p_util.h
index 473a8d94ab..660192b28e 100644
--- a/src/gallium/include/pipe/p_util.h
+++ b/src/gallium/include/pipe/p_util.h
@@ -443,21 +443,6 @@ static INLINE int iround(float f)
 #define FABSF(x)   ((float) fabs(x))
 #endif
 
-/* Pretty fast, and accurate.
- * Based on code from http://www.flipcode.com/totd/
- */
-static INLINE float LOG2(float val)
-{
-   union fi num;
-   int log_2;
-
-   num.f = val;
-   log_2 = ((num.i >> 23) & 255) - 128;
-   num.i &= ~(255 << 23);
-   num.i += 127 << 23;
-   num.f = ((-1.0f/3) * num.f + 2) * num.f - 2.0f/3;
-   return num.f + log_2;
-}
 
 #if defined(__GNUC__)
 #define CEILF(x)   ceilf(x)
-- 
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