44 lines
1.2 KiB
C
44 lines
1.2 KiB
C
/* trig.h - Trigonometric function support. */
|
|
/*
|
|
* GRUB -- GRand Unified Bootloader
|
|
* Copyright (C) 2008 Free Software Foundation, Inc.
|
|
*
|
|
* GRUB is free software: you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation, either version 3 of the License, or
|
|
* (at your option) any later version.
|
|
*
|
|
* GRUB 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 General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
|
|
*/
|
|
|
|
#ifndef GRUB_TRIG_HEADER
|
|
#define GRUB_TRIG_HEADER 1
|
|
|
|
#define GRUB_TRIG_ANGLE_MAX 256
|
|
#define GRUB_TRIG_ANGLE_MASK 255
|
|
#define GRUB_TRIG_FRACTION_SCALE 16384
|
|
|
|
extern const short grub_trig_sintab[];
|
|
extern const short grub_trig_costab[];
|
|
|
|
static __inline int
|
|
grub_sin (int x)
|
|
{
|
|
x &= GRUB_TRIG_ANGLE_MASK;
|
|
return grub_trig_sintab[x];
|
|
}
|
|
|
|
static __inline int
|
|
grub_cos (int x)
|
|
{
|
|
x &= GRUB_TRIG_ANGLE_MASK;
|
|
return grub_trig_costab[x];
|
|
}
|
|
|
|
#endif /* ! GRUB_TRIG_HEADER */
|