add WRAP macro

2003-08-31 22:37:32 +00:00
parent be62c37d30
commit 0d3d590766
1 changed files with 4 additions and 1 deletions
@@ -52,11 +52,14 @@ inline unsigned long max(unsigned long a, unsigned int b) { return a > b? a:b; }
 #define PI		((float)3.1415926535897932384626433832795)
 #define DegreeToRadian( degree ) ((degree) * (PI / 180.0f))
 #define RadianToDegree( radian ) ((radian) * (180.0f / PI))
+
 // Scales x so that l1 corresponds to l2 and h1 corresponds to h2.  Does not modify x, MUST assign the result to something!
 #define SCALE(x, l1, h1, l2, h2)	(((x) - (l1)) / ((h1) - (l1)) * ((h2) - (l2)) + (l2))
-// Clamps x
+
 #define CLAMP(x, l, h)	{if (x > h) x = h; else if (x < l) x = l;}

+#define WRAP(x, n)	{if (x<0) x += ((-x/n)+1)*n; x = x%n;}
+

 //-----------------------------------------------------------------------------
 // Misc helper functions