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/* 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 */
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