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Comparing ray/src/common/rtmath.h (file contents):
Revision 3.7 by greg, Sat Jun 29 15:46:02 2013 UTC vs.
Revision 3.11 by schorsch, Thu Mar 10 18:24:49 2016 UTC

# Line 14 | Line 14
14   #ifdef __cplusplus
15   extern "C" {
16   #endif
17 –
17                                  /* regular transformation */
18   typedef struct {
19          MAT4  xfm;                              /* transform matrix */
# Line 45 | Line 44 | extern double  atan2a(double y, double x);
44                                          /* table-based cosine approximation */
45   #define  tsin(x)                tcos((x)-(PI/2.))
46   #define  ttan(x)                (tsin(x)/tcos(x))
47 + #endif
48 +
49 + /* VC 2015 has those defined (XXX possibly earlier?) */
50 + #if ((defined(_WIN32) || defined(_WIN64)) \
51 +                && (!defined(_MS_VER) || _MS_VER < 1900))
52 + extern double   erf(double x);
53 + extern double   erfc(double x);
54   #endif
55                                          /* defined in xf.c */
56   extern int      xf(XF *ret, int ac, char *av[]);

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