cstool/noise/interp.h Source File (Crystal Space 2.0 Public API Reference)

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cstool/noise/interp.h

    00001 // interp.h
    00002 //
    00003 // Copyright (C) 2003, 2004 Jason Bevins
    00004 //
    00005 // This library is free software; you can redistribute it and/or modify it
    00006 // under the terms of the GNU Lesser General Public License as published by
    00007 // the Free Software Foundation; either version 2.1 of the License, or (at
    00008 // your option) any later version.
    00009 //
    00010 // This library is distributed in the hope that it will be useful, but WITHOUT
    00011 // ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
    00012 // FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
    00013 // License (COPYING.txt) for more details.
    00014 //
    00015 // You should have received a copy of the GNU Lesser General Public License
    00016 // along with this library; if not, write to the Free Software Foundation,
    00017 // Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
    00018 //
    00019 // The developer's email is jlbezigvins@gmzigail.com (for great email, take
    00020 // off every 'zig'.)
    00021 //
    00022
    00023 #ifndef NOISE_INTERP_H
    00024 #define NOISE_INTERP_H
    00025
    00026 namespace CS {
    00027 namespace Math {
    00028 namespace Noise {
    00029
    00032
    00047   inline double CubicInterp (double n0, double n1, double n2, double n3,
    00048     double a)
    00049   {
    00050           double p = (n3 - n2) - (n0 - n1);
    00051           double q = (n0 - n1) - p;
    00052           double r = n2 - n0;
    00053           double s = n1;
    00054           return p * a * a * a + q * a * a + r * a + s;
    00055   }
    00056
    00068   inline double LinearInterp (double n0, double n1, double a)
    00069   {
    00070     return ((1.0 - a) * n0) + (a * n1);
    00071   }
    00072
    00083   inline double SCurve3 (double a)
    00084   {
    00085     return (a * a * (3.0 - 2.0 * a));
    00086   }
    00087
    00101   inline double SCurve5 (double a)
    00102   {
    00103     double a3 = a * a * a;
    00104     double a4 = a3 * a;
    00105     double a5 = a4 * a;
    00106     return (6.0 * a5) - (15.0 * a4) + (10.0 * a3);
    00107   }
    00108
    00109   // @}
    00110
    00111 } // namespace Noise
    00112 } // namespace Math
    00113 } // namespace CS
    00114
    00115 #endif