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-rw-r--r--src/mesa/tnl/t_vb_arbprogram.c4
1 files changed, 4 insertions, 0 deletions
diff --git a/src/mesa/tnl/t_vb_arbprogram.c b/src/mesa/tnl/t_vb_arbprogram.c
index 96311ff17b..508233cf31 100644
--- a/src/mesa/tnl/t_vb_arbprogram.c
+++ b/src/mesa/tnl/t_vb_arbprogram.c
@@ -345,7 +345,11 @@ static void do_LOG( struct arb_vp_machine *m, union instruction op )
const GLfloat *arg0 = m->File[op.alu.file0][op.alu.idx0];
GLfloat tmp = FABSF(arg0[0]);
int exponent;
+#ifdef _WIN32
+ GLfloat mantissa = (GLfloat) frexp((double)tmp, &exponent);
+#else
GLfloat mantissa = frexpf(tmp, &exponent);
+#endif
result[0] = (GLfloat) (exponent - 1);
result[1] = 2.0 * mantissa; /* map [.5, 1) -> [1, 2) */