1 files changed, 44 insertions, 28 deletions

diff --git a/lib/mesa/include/c99_math.h b/lib/mesa/include/c99_math.h
index e906c26aa..8a67fb133 100644
--- a/lib/mesa/include/c99_math.h
+++ b/lib/mesa/include/c99_math.h
@@ -38,16 +38,55 @@
 #include "c99_compat.h"
 
 
+#if defined(_MSC_VER)
+
 /* This is to ensure that we get M_PI, etc. definitions */
-#if defined(_MSC_VER) && !defined(_USE_MATH_DEFINES)
+#if !defined(_USE_MATH_DEFINES)
 #error _USE_MATH_DEFINES define required when building with MSVC
 #endif 
 
+#if _MSC_VER < 1800
+#define isfinite(x) _finite((double)(x))
+#define isnan(x) _isnan((double)(x))
+#endif /* _MSC_VER < 1800 */
+
+#if _MSC_VER < 1800
+static inline double log2( double x )
+{
+   const double invln2 = 1.442695041;
+   return log( x ) * invln2;
+}
+
+static inline double
+round(double x)
+{
+   return x >= 0.0 ? floor(x + 0.5) : ceil(x - 0.5);
+}
 
-#if !defined(_MSC_VER) && \
-    __STDC_VERSION__ < 199901L && \
-    (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
-    !defined(__cplusplus)
+static inline float
+roundf(float x)
+{
+   return x >= 0.0f ? floorf(x + 0.5f) : ceilf(x - 0.5f);
+}
+#endif
+
+#ifndef INFINITY
+#include <float.h> // DBL_MAX
+#define INFINITY (DBL_MAX + DBL_MAX)
+#endif
+
+#ifndef NAN
+#define NAN (INFINITY - INFINITY)
+#endif
+
+#endif /* _MSC_VER */
+
+
+#if (defined(_MSC_VER) && _MSC_VER < 1800) || \
+    (!defined(_MSC_VER) && \
+     __STDC_VERSION__ < 199901L && \
+     (!defined(_XOPEN_SOURCE) || _XOPEN_SOURCE < 600) && \
+     !defined(__cplusplus))
 
 static inline long int
 lrint(double d)
@@ -185,27 +224,4 @@ fpclassify(double x)
 #endif
 
 
-/* Since C++11, the following functions are part of the std namespace. Their C
- * counteparts should still exist in the global namespace, however cmath
- * undefines those functions, which in glibc 2.23, are defined as macros rather
- * than functions as in glibc 2.22.
- */
-#if __cplusplus >= 201103L && (__GLIBC__ > 2 || (__GLIBC__ == 2 && __GLIBC_MINOR__ >= 23))
-#include <cmath>
-
-using std::fpclassify;
-using std::isfinite;
-using std::isinf;
-using std::isnan;
-using std::isnormal;
-using std::signbit;
-using std::isgreater;
-using std::isgreaterequal;
-using std::isless;
-using std::islessequal;
-using std::islessgreater;
-using std::isunordered;
-#endif
-
-
 #endif /* #define _C99_MATH_H_ */