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84 lines
2.2 KiB
C
84 lines
2.2 KiB
C
/*-
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* Copyright (c) 2015 Dag-Erling Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifndef FP16_H_INCLUDED
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#define FP16_H_INCLUDED
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typedef signed long long fp16_t;
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#define ItoFP16(n) ((signed long long)(n) << 16)
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#define FP16toI(n) ((signed long long)(n) >> 16)
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#ifndef _KERNEL
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#define FP16toF(n) ((n) / 65536.0)
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#endif
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/* add a and b */
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static inline fp16_t
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fp16_add(fp16_t a, fp16_t b)
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{
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return (a + b);
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}
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/* subtract b from a */
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static inline fp16_t
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fp16_sub(fp16_t a, fp16_t b)
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{
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return (a - b);
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}
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/* multiply a by b */
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static inline fp16_t
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fp16_mul(fp16_t a, fp16_t b)
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{
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return (a * b >> 16);
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}
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/* divide a by b */
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static inline fp16_t
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fp16_div(fp16_t a, fp16_t b)
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{
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return ((a << 16) / b);
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}
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/* square root */
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fp16_t fp16_sqrt(fp16_t);
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#define FP16_2PI 411774
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#define FP16_PI 205887
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#define FP16_PI_2 102943
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#define FP16_PI_4 51471
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/* sine and cosine */
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fp16_t fp16_sin(fp16_t);
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fp16_t fp16_cos(fp16_t);
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#endif
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