From 8ddb66ffbe37b9fabd2cb30f36b7435deb3e9965 Mon Sep 17 00:00:00 2001 From: havoc Date: Sat, 13 Sep 2003 20:41:35 +0000 Subject: [PATCH] added bit2i and log2i (these return the base 2 exponent of an integer, perhaps bit2i should be replaced by log2i() - 1 though) git-svn-id: svn://svn.icculus.org/twilight/trunk/darkplaces@3456 d7cf8633-e32d-0410-b094-e92efae38249 --- mathlib.h | 2 ++ 1 file changed, 2 insertions(+) diff --git a/mathlib.h b/mathlib.h index c5a67abd..cece49c0 100644 --- a/mathlib.h +++ b/mathlib.h @@ -52,6 +52,8 @@ extern vec3_t vec3_origin; #define lhrandom(MIN,MAX) ((rand() & 32767) * (((MAX)-(MIN)) * (1.0f / 32767.0f)) + (MIN)) #define invpow(base,number) (log(number) / log(base)) +#define bit2i(n) (((n & 0x55555555) != 0 ? 1 : 0) | ((n & 0x66666666) !=0 ? 2 : 0) | ((n & 0x78787878) != 0 ? 4 : 0) | ((n & 0x7F807F80) != 0 ? 8 : 0) | ((n & 0x7FFF8000) != 0 ? 16 : 0)) +#define log2i(n) (((n & 0xAAAAAAAA) != 0 ? 1 : 0) | ((n & 0xCCCCCCCC) != 0 ? 2 : 0) | ((n & 0xF0F0F0F0) != 0 ? 4 : 0) | ((n & 0xFF00FF00) != 0 ? 8 : 0) | ((n & 0xFFFF0000) != 0 ? 16 : 0)) #define DEG2RAD(a) ((a) * ((float) M_PI / 180.0f)) #define RAD2DEG(a) ((a) * (180.0f / (float) M_PI)) -- 2.39.2