From d321cdcd28ad63aec9c7ce04adbf4a25a24ae003 Mon Sep 17 00:00:00 2001
From: Alexandre Julliard <julliard@winehq.org>
Date: Wed, 17 May 2017 20:20:09 +0200
Subject: [PATCH] d3dx9: Check for missing log2 function.

Signed-off-by: Matteo Bruni <mbruni@codeweavers.com>
Signed-off-by: Alexandre Julliard <julliard@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 fbd99ac58f9..bd934af4b5a 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