23e6278ed9
rounding) has better spread. Implement fp16_sin() to go along with fp16_cos(). In the rendering loop, switch from addition to subtraction so the center of the pattern will be a trough rather than a peak. This is completely arbitrary, of course, but looks better to me.
86 lines
2.2 KiB
C
86 lines
2.2 KiB
C
/*-
|
|
* Copyright (c) 2015 Dag-Erling Smørgrav
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*
|
|
* $FreeBSD$
|
|
*/
|
|
|
|
#ifndef FP16_H_INCLUDED
|
|
#define FP16_H_INCLUDED
|
|
|
|
typedef signed long long fp16_t;
|
|
|
|
#define ItoFP16(n) ((signed long long)(n) << 16)
|
|
#define FP16toI(n) ((signed long long)(n) >> 16)
|
|
|
|
#ifndef _KERNEL
|
|
#define FP16toF(n) ((n) / 65536.0)
|
|
#endif
|
|
|
|
/* add a and b */
|
|
static inline fp16_t
|
|
fp16_add(fp16_t a, fp16_t b)
|
|
{
|
|
|
|
return (a + b);
|
|
}
|
|
|
|
/* subtract b from a */
|
|
static inline fp16_t
|
|
fp16_sub(fp16_t a, fp16_t b)
|
|
{
|
|
|
|
return (a - b);
|
|
}
|
|
|
|
/* multiply a by b */
|
|
static inline fp16_t
|
|
fp16_mul(fp16_t a, fp16_t b)
|
|
{
|
|
|
|
return (a * b >> 16);
|
|
}
|
|
|
|
/* divide a by b */
|
|
static inline fp16_t
|
|
fp16_div(fp16_t a, fp16_t b)
|
|
{
|
|
|
|
return ((a << 16) / b);
|
|
}
|
|
|
|
/* square root */
|
|
fp16_t fp16_sqrt(fp16_t);
|
|
|
|
#define FP16_2PI 411774
|
|
#define FP16_PI 205887
|
|
#define FP16_PI_2 102943
|
|
#define FP16_PI_4 51471
|
|
|
|
/* sine and cosine */
|
|
fp16_t fp16_sin(fp16_t);
|
|
fp16_t fp16_cos(fp16_t);
|
|
|
|
#endif
|