forked from enlightenment/efl
126 lines
2.7 KiB
C
126 lines
2.7 KiB
C
/* EINA - EFL data type library
|
|
* Copyright (C) 2007-2008 Jorge Luis Zapata Muga
|
|
*
|
|
* This library is free software; you can redistribute it and/or
|
|
* modify it under the terms of the GNU Lesser General Public
|
|
* License as published by the Free Software Foundation; either
|
|
* version 2.1 of the License, or (at your option) any later version.
|
|
*
|
|
* This library is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
|
* Lesser General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU Lesser General Public
|
|
* License along with this library;
|
|
* if not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef EINA_F16P16_H_
|
|
#define EINA_F16P16_H_
|
|
|
|
#include <stdint.h>
|
|
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
typedef int32_t Eina_F16p16;
|
|
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_int_from(int32_t v)
|
|
{
|
|
return v << 16;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline int32_t eina_f16p16_int_to(Eina_F16p16 v)
|
|
{
|
|
return v >> 16;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_float_from(float v)
|
|
{
|
|
Eina_F16p16 r;
|
|
r = (Eina_F16p16)(v * 65536.0f + (v < 0 ? -0.5f : 0.5f));
|
|
return r;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline float eina_f16p16_float_to(Eina_F16p16 v)
|
|
{
|
|
float r;
|
|
r = v / 65536.0f;
|
|
return r;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_add(Eina_F16p16 a, Eina_F16p16 b)
|
|
{
|
|
return a + b;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_sub(Eina_F16p16 a, Eina_F16p16 b)
|
|
{
|
|
return a - b;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_mul(Eina_F16p16 a, Eina_F16p16 b)
|
|
{
|
|
return (a * b) >> 16;
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline Eina_F16p16 eina_f16p16_sqrt(Eina_F16p16 a)
|
|
{
|
|
unsigned int root, remHi, remLo, testDiv, count;
|
|
|
|
root = 0; /* Clear root */
|
|
remHi = 0; /* Clear high part of partial remainder */
|
|
remLo = a; /* Get argument into low part of partial remainder */
|
|
count = (15 + (16 >> 1)); /* Load loop counter */
|
|
do
|
|
{
|
|
remHi = (remHi << 2) | (remLo >> 30);
|
|
remLo <<= 2; /* get 2 bits of arg */
|
|
root <<= 1; /* Get ready for the next bit in the root */
|
|
testDiv = (root << 1) + 1; /* Test radical */
|
|
if (remHi >= testDiv)
|
|
{
|
|
remHi -= testDiv;
|
|
root++;
|
|
}
|
|
} while (count-- != 0);
|
|
return (root);
|
|
}
|
|
/**
|
|
* To be documented
|
|
* FIXME: To be fixed
|
|
*/
|
|
static inline unsigned int eina_f16p16_fracc_get(Eina_F16p16 v)
|
|
{
|
|
return (v & 0xffff);
|
|
}
|
|
|
|
#endif /*EINA_F16P16_H_*/
|