FreeBSD/Linux Kernel Cross Reference
sys/dev/syscons/plasma/fp16.h

     /*-
      * 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

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