include/plugin_interface/SC_Constants.h

   1 /*
   2         SuperCollider real time audio synthesis system
   3     Copyright (c) 2002 James McCartney. All rights reserved.
   4         http://www.audiosynth.com
   5
   6     This program is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     This program is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with this program; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301  USA
  19 */
  20
  21 #ifndef _SC_Constants_
  22 #define _SC_Constants_
  23
  24 #include <cmath>
  25
  26 #ifndef __FP__
  27 const double pi     = std::acos(-1.);
  28 #endif
  29 const double pi2    = pi * .5;
  30 const double pi32   = pi * 1.5;
  31 const double twopi  = pi * 2.;
  32 const double rtwopi = 1. / twopi;
  33 const double log001 = std::log(0.001);
  34 const double log01  = std::log(0.01);
  35 const double log1   = std::log(0.1);
  36 const double rlog2  = 1./std::log(2.);
  37 const double sqrt2  = std::sqrt(2.);
  38 const double rsqrt2 = 1. / sqrt2;
  39
  40 const float pi_f    = std::acos(-1.f);
  41 const float pi2_f   = pi_f * 0.5f;
  42 const float pi32_f  = pi_f * 1.5f;
  43 const float twopi_f = pi_f * 2.f;
  44 const float sqrt2_f = std::sqrt(2.f);
  45 const float rsqrt2_f= 1.f/std::sqrt(2.f);
  46
  47 // used to truncate precision
  48 const float truncFloat = (float)(3. * std::pow(2.0,22));
  49 const double truncDouble = 3. * std::pow(2.0,51);
  50
  51 const float kBadValue = 1e20f; // used in the secant table for values very close to 1/0
  52
  53 #endif