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45 lines
1.2 KiB
C
45 lines
1.2 KiB
C
/* trig.h - Trigonometric function support. */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2008 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_TRIG_HEADER
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#define GRUB_TRIG_HEADER 1
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#define GRUB_TRIG_ANGLE_MAX 256
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#define GRUB_TRIG_ANGLE_MASK 255
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#define GRUB_TRIG_FRACTION_SCALE 16384
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extern const short grub_trig_sintab[];
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extern const short grub_trig_costab[];
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static __inline int
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grub_sin (int x)
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{
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x &= GRUB_TRIG_ANGLE_MASK;
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return grub_trig_sintab[x];
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}
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static __inline int
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grub_cos (int x)
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{
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x &= GRUB_TRIG_ANGLE_MASK;
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return grub_trig_costab[x];
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}
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#endif /* ! GRUB_TRIG_HEADER */
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