Revision: 53791
http://brlcad.svn.sourceforge.net/brlcad/?rev=53791&view=rev
Author: brlcad
Date: 2012-11-21 04:55:40 +0000 (Wed, 21 Nov 2012)
Log Message:
-----------
rearrange the ancient INFINITY constants to use available platform-defined
limits that usually represent infinity. fall back to what we were doing if all
else fails, but it should increase our modeling range to the extent available
for fastf_t.
Modified Paths:
--------------
brlcad/trunk/include/bu.h
Modified: brlcad/trunk/include/bu.h
===================================================================
--- brlcad/trunk/include/bu.h 2012-11-21 04:42:06 UTC (rev 53790)
+++ brlcad/trunk/include/bu.h 2012-11-21 04:55:40 UTC (rev 53791)
@@ -1231,23 +1231,31 @@
/** DEPRECATED, do not use */
#define SMALL SQRT_SMALL_FASTF
+
/**
- * It is necessary to have a representation of 1.0/0.0, or "infinity"
- * that fits within the dynamic range of the machine being used. This
- * constant places an upper bound on the size object which can be
- * represented in the model.
+ * It is necessary to have a representation of 1.0/0.0 or log(0),
+ * i.e., "infinity" that fits within the dynamic range of the machine
+ * being used. This constant places an upper bound on the size object
+ * which can be represented in the model. With IEEE 754 floating
+ * point, this may print as 'inf' and is represented with all 1 bits
+ * in the biased-exponent field and all 0 bits in the fraction with
+ * the sign indicating positive (0) or negative (1) infinity.
*/
-#ifdef INFINITY
-# undef INFINITY
+#ifndef INFINITY
+# if defined(HUGE_VALF)
+# define INFINITY ((fastf_t)HUGE_VALF)
+# elif defined(HUGE_VAL)
+# define INFINITY ((fastf_t)HUGE_VAL)
+# elif defined(HUGE)
+# define INFINITY ((fastf_t)HUGE)
+# elif defined(MAXFLOAT)
+# define INFINITY ((fastf_t)MAXFLOAT)
+# else
+# define INFINITY ((fastf_t)1.0e40)
+# endif
#endif
-#if defined(vax)
-# define INFINITY (1.0e20) /* VAX limit is 10**37 */
-#else
-# define INFINITY (1.0e40) /* IBM limit is 10**75 */
-#endif
-
/*----------------------------------------------------------------------*/
/** @addtogroup bitv */
/** @ingroup container */
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