--- ray/src/common/rtmath.h	2008/05/31 19:38:36	3.4
+++ ray/src/common/rtmath.h	2021/12/13 21:05:00	3.15
@@ -1,4 +1,4 @@
-/* RCSid $Id: rtmath.h,v 3.4 2008/05/31 19:38:36 greg Exp $ */
+/* RCSid $Id: rtmath.h,v 3.15 2021/12/13 21:05:00 greg Exp $ */
 /*
  * Header for Radiance vector and math routines
  */
@@ -14,7 +14,6 @@
 #ifdef __cplusplus
 extern "C" {
 #endif
-
 				/* regular transformation */
 typedef struct {
 	MAT4  xfm;				/* transform matrix */
@@ -33,18 +32,19 @@ typedef struct {
 #define	 PI		3.14159265358979323846
 #endif
 #endif
+					/* defined in tcos.c */
+extern double	tcos(double x);
+extern double	atan2a(double y, double x);
 
-#ifdef  FASTMATH
+#ifdef  __FAST_MATH__
 #define  tcos			cos
 #define  tsin			sin
 #define  ttan			tan
 #else
-					/* table-based cosine approximation */
+					/* table-based approx in tcos.c */
 #define  tsin(x)		tcos((x)-(PI/2.))
 #define  ttan(x)		(tsin(x)/tcos(x))
 #endif
-					/* defined in tcos.c */
-extern double	tcos(double x);
 					/* defined in xf.c */
 extern int	xf(XF *ret, int ac, char *av[]);
 extern int	invxf(XF *ret, int ac, char *av[]);
@@ -61,4 +61,3 @@ extern double	fdir2diff(int32 dc1, FVECT v2);
 }
 #endif
 #endif /* _RAD_RTMATH_H_ */
-