30 lines
969 B
C++
30 lines
969 B
C++
/*
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Copyright (C) 2003-2008 Fons Adriaensen <fons@kokkinizita.net>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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float exp2ap (float x)
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{
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int i;
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i = (int)(floor (x));
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x -= i;
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// return ldexp (1 + x * (0.66 + 0.34 * x), i);
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return ldexp (1 + x * (0.6930 + x * (0.2416 + x * (0.0517 + x * 0.0137))), i);
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}
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