d3dx9: Check for missing log2 function.

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

d3dx9: Check for missing log2 function.
d321cdcd · Alexandre Julliard · 2e9ca462 · d321cdcd
Commit d321cdcd authored May 17, 2017 by Alexandre Julliard
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preshader.c dlls/d3dx9_36/preshader.c +4 -0

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--- 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