Alexandre Julliard : d3dx9: Check for missing log2 function.

[Alexandre Julliard]

Module: wine
Branch: master
Commit: d321cdcd28ad63aec9c7ce04adbf4a25a24ae003
URL:    http://source.winehq.org/git/wine.git/?a=commit;h=d321cdcd28ad63aec9c7ce04adbf4a25a24ae003

Author: Alexandre Julliard <julliard at winehq.org>
Date:   Wed May 17 20:20:09 2017 +0200

d3dx9: Check for missing log2 function.

Signed-off-by: Matteo Bruni <mbruni at codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard at winehq.org>

---

 dlls/d3dx9_36/preshader.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/dlls/d3dx9_36/preshader.c b/dlls/d3dx9_36/preshader.c
index fbd99ac..bd934af 100644
--- a/dlls/d3dx9_36/preshader.c
+++ b/dlls/d3dx9_36/preshader.c
@@ -104,7 +104,11 @@ static double pres_log(double *args, int n)
     if (v == 0.0)
         return 0.0;
     else
+#ifdef HAVE_LOG2
         return log2(v);
+#else
+        return log(v) / log(2);
+#endif
 }
 
 #define PRES_OPCODE_MASK 0x7ff00000