apps/plugins/lib/fixedpoint.h

   1 /***************************************************************************
   2  *             __________               __   ___.
   3  *   Open      \______   \ ____   ____ |  | _\_ |__   _______  ___
   4  *   Source     |       _//  _ \_/ ___\|  |/ /| __ \ /  _ \  \/  /
   5  *   Jukebox    |    |   (  <_> )  \___|    < | \_\ (  <_> > <  <
   6  *   Firmware   |____|_  /\____/ \___  >__|_ \|___  /\____/__/\_ \
   7  *                     \/            \/     \/    \/            \/
   8  * $Id$
   9  *
  10  * Copyright (C) 2006 Jens Arnold
  11  *
  12  * Fixed point library for plugins
  13  *
  14  * This program is free software; you can redistribute it and/or
  15  * modify it under the terms of the GNU General Public License
  16  * as published by the Free Software Foundation; either version 2
  17  * of the License, or (at your option) any later version.
  18  *
  19  * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
  20  * KIND, either express or implied.
  21  *
  22  ****************************************************************************/
  23
  24 long fsincos(unsigned long phase, long *cos);
  25 long fsqrt(long a, unsigned int fracbits);
  26 long cos_int(int val);
  27 long sin_int(int val);
  28 long flog(int x);
  29
  30 /* fast unsigned multiplication (16x16bit->32bit or 32x32bit->32bit,
  31  * whichever is faster for the architecture) */
  32 #ifdef CPU_ARM
  33 #define FMULU(a, b) ((uint32_t) (((uint32_t) (a)) * ((uint32_t) (b))))
  34 #else /* SH1, coldfire */
  35 #define FMULU(a, b) ((uint32_t) (((uint16_t) (a)) * ((uint16_t) (b))))
  36 #endif