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Math Lib: pow_i for int power-of

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Campbell Barton
2015-04-24 11:37:48 +10:00
parent f829f556b4
commit bdf6393c98
2 changed files with 16 additions and 0 deletions
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1
source/blender/blenlib/BLI_math_base.h
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@@ -214,6 +214,7 @@ MINLINE int iroundf(float a);
MINLINE int divide_round_i(int a, int b); MINLINE int divide_round_i(int a, int b);
MINLINE int mod_i(int i, int n); MINLINE int mod_i(int i, int n);
int pow_i(int base, int exp);
double double_round(double x, int ndigits); double double_round(double x, int ndigits);
#ifdef BLI_MATH_GCC_WARN_PRAGMA #ifdef BLI_MATH_GCC_WARN_PRAGMA

15
source/blender/blenlib/intern/math_base.c
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@@ -31,6 +31,21 @@
#include "BLI_strict_flags.h" #include "BLI_strict_flags.h"
int pow_i(int base, int exp)
{
int result = 1;
BLI_assert(exp >= 0);
while (exp) {
if (exp & 1) {
result *= base;
}
exp >>= 1;
base *= base;
}
return result;
}
/* from python 3.1 floatobject.c /* from python 3.1 floatobject.c
* ndigits must be between 0 and 21 */ * ndigits must be between 0 and 21 */
double double_round(double x, int ndigits) double double_round(double x, int ndigits)