Revision: 55037
http://brlcad.svn.sourceforge.net/brlcad/?rev=55037&view=rev
Author: brlcad
Date: 2013-04-04 03:44:18 +0000 (Thu, 04 Apr 2013)
Log Message:
-----------
document the JOIN1 macros
Modified Paths:
--------------
brlcad/trunk/include/vmath.h
Modified: brlcad/trunk/include/vmath.h
===================================================================
--- brlcad/trunk/include/vmath.h 2013-04-04 03:32:12 UTC (rev 55036)
+++ brlcad/trunk/include/vmath.h 2013-04-04 03:44:18 UTC (rev 55037)
@@ -1149,17 +1149,38 @@
} while (0)
+/**
+ * Compose 3D vector at `a' of:
+ * vector at `b' plus
+ * scalar `c' times vector at `d'
+ *
+ * This is basically a shorthand for VSCALE();VADD2();.
+ */
#define VJOIN1(a, b, c, d) do { \
(a)[X] = (b)[X] + (c) * (d)[X]; \
(a)[Y] = (b)[Y] + (c) * (d)[Y]; \
(a)[Z] = (b)[Z] + (c) * (d)[Z]; \
} while (0)
+/**
+ * Compose 2D vector at `a' of:
+ * vector at `b' plus
+ * scalar `c' times vector at `d'
+ *
+ * This is basically a shorthand for V2SCALE();V2ADD2();.
+ */
#define V2JOIN1(a, b, c, d) do { \
(a)[X] = (b)[X] + (c) * (d)[X]; \
(a)[Y] = (b)[Y] + (c) * (d)[Y]; \
} while (0)
+/**
+ * Compose 4D vector at `a' of:
+ * vector at `b' plus
+ * scalar `c' times vector at `d'
+ *
+ * This is basically a shorthand for HSCALE();HADD2();.
+ */
#define HJOIN1(a, b, c, d) do { \
(a)[X] = (b)[X] + (c) * (d)[X]; \
(a)[Y] = (b)[Y] + (c) * (d)[Y]; \
@@ -1167,6 +1188,13 @@
(a)[W] = (b)[W] + (c) * (d)[W]; \
} while (0)
+/**
+ * Compose `n'-D vector at `a' of:
+ * vector at `b' plus
+ * scalar `c' times vector at `d'
+ *
+ * This is basically a shorthand for VSCALEN();VADD2N();.
+ */
#define VJOIN1N(a, b, c, d, n) do { \
register int _vjoin1; \
for (_vjoin1 = 0; \
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