diff options
Diffstat (limited to 'src/utils/mathutils.h')
| -rw-r--r-- | src/utils/mathutils.h | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/src/utils/mathutils.h b/src/utils/mathutils.h index 69267186c..3fa7ad002 100644 --- a/src/utils/mathutils.h +++ b/src/utils/mathutils.h @@ -24,6 +24,7 @@ #define UTILS_MATHUTILS_H #include <string> +#include <cmath> #include "localconsts.h" @@ -63,6 +64,60 @@ static const uint16_t crc_table[256] = 0x6e17, 0x7e36, 0x4e55, 0x5e74, 0x2e93, 0x3eb2, 0x0ed1, 0x1ef0 }; +static const int square_roots[1000] = +{ + 0, 1, 1, 1, 2, 2, 2, 2, 2, 3, 3, 3, 3, 3, 3, 3, 4, 4, 4, 4, + 4, 4, 4, 4, 4, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 5, 6, 6, 6, 6, + 6, 6, 6, 6, 6, 6, 6, 6, 6, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, 7, + 7, 7, 7, 7, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, 8, + 8, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, 9, + 10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10,10, + 10,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11,11, + 11,11,11,11,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12,12, + 12,12,12,12,12,12,12,12,12,13,13,13,13,13,13,13,13,13,13,13, + 13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,13,14,14,14,14, + 14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14,14, + 14,14,14,14,14,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15, + 15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,15,16,16,16,16, + 16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16,16, + 16,16,16,16,16,16,16,16,16,17,17,17,17,17,17,17,17,17,17,17, + 17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17,17, + 17,17,17,17,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18, + 18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18,18, + 18,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19, + 19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19,19, + 20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20, + 20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20,20, + 20,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, + 21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21,21, + 21,21,21,21,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22, + 22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22,22, + 22,22,22,22,22,22,22,22,22,23,23,23,23,23,23,23,23,23,23,23, + 23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23, + 23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,23,24,24,24,24, + 24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24, + 24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24,24, + 24,24,24,24,24,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25, + 25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25, + 25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,25,26,26,26,26, + 26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26, + 26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26,26, + 26,26,26,26,26,26,26,26,26,27,27,27,27,27,27,27,27,27,27,27, + 27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27, + 27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27,27, + 27,27,27,27,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, + 28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, + 28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28,28, + 28,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29, + 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29, + 29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29,29, + 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30, + 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30, + 30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30,30, + 30,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31, + 31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31,31 +}; + inline uint16_t getCrc16(const std::string &str) A_WARN_UNUSED; inline float fastInvSqrt(float x) A_WARN_UNUSED; inline float fastSqrt(const float x) A_WARN_UNUSED; @@ -130,4 +185,11 @@ inline int powerOfTwo(const unsigned int input) return value; } +inline int fastSqrtInt(const unsigned int n) +{ + if (n < 1000) + return square_roots[n]; + return sqrt(n); +} + #endif // UTILS_MATHUTILS_H |