90 lines
1.8 KiB
C
90 lines
1.8 KiB
C
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/*****************************************************************************
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*
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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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*
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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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*
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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* $Id: sincos.c 591 2006-01-17 12:28:08Z picard $
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*
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* The Core Pocket Media Player
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* Copyright (c) 2004-2005 Gabor Kovacs
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*
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****************************************************************************/
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#include "../common.h"
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#define PI 3.14159265358979324
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NOINLINE double floor(double i);
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NOINLINE double ceil(double i)
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{
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if (i<0)
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return -floor(-i);
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else
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{
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double d = floor(i);
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if (d!=i)
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d+=1.0;
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return d;
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}
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}
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NOINLINE double floor(double i)
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{
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if (i<0)
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return -ceil(-i);
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else
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return (double)(int)i;
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}
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NOINLINE double sin(double i)
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{
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int n,k;
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double j,sum;
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int sign = 0;
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if (i<0)
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{
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sign = 1;
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i = -i;
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}
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i *= 1.0/(2*PI);
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i -= floor(i);
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if (i>=0.5)
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{
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i -= 0.5;
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sign ^= 1;
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}
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i *= 2*PI;
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k = 1;
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j = sum = i;
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for (n=3;n<14;n+=2)
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{
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k *= (n-1)*n;
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j *= i*i;
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if (n & 2)
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sum -= j/k;
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else
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sum += j/k;
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}
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return sign ? -sum:sum;
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}
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NOINLINE double cos(double i)
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{
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return sin(i+PI/2);
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}
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