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58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* Goom Project
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* Copyright (C) <2003> Jean-Christophe Hoelt <jeko@free.fr>
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*
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* goom_core.c:Contains the core of goom's work.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Library General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library 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 GNU
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* Library General Public License for more details.
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*
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* You should have received a copy of the GNU Library General Public
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* License along with this library; if not, write to the
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* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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* Boston, MA 02111-1307, USA.
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*/
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#ifndef MATHTOOLS_H
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#define MATHTOOLS_H
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#include <glib.h>
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#define _double2fixmagic (68719476736.0*1.5)
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/* 2^36 * 1.5, (52-_shiftamt=36) uses limited precisicion to floor */
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#define _shiftamt 16
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/* 16.16 fixed point representation */
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#if G_BYTE_ORDER == G_BIG_ENDIAN
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#define iexp_ 0
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#define iman_ 1
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#else
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#define iexp_ 1
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#define iman_ 0
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#endif /* BigEndian_ */
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/* TODO: this optimization is very efficient: put it again when all works
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#ifdef HAVE_MMX
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#define F2I(dbl,i) {double d = dbl + _double2fixmagic; i = ((int*)&d)[iman_] >> _shiftamt;}
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#else*/
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#define F2I(dbl,i) i=(int)dbl;
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/*#endif*/
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#if 0
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#define SINCOS(f,s,c) \
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__asm__ __volatile__ ("fsincos" : "=t" (c), "=u" (s) : "0" (f))
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#else
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#define SINCOS(f,s,c) {s=sin(f);c=cos(f);}
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#endif
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extern float sin256[256];
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extern float cos256[256];
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#endif
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