1 /* Goom Project 2 * Copyright (C) <2003> Jean-Christophe Hoelt <jeko@free.fr> 3 * 4 * goom_core.c:Contains the core of goom's work. 5 * 6 * This library is free software; you can redistribute it and/or 7 * modify it under the terms of the GNU Library General Public 8 * License as published by the Free Software Foundation; either 9 * version 2 of the License, or (at your option) any later version. 10 * 11 * This library 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 GNU 14 * Library General Public License for more details. 15 * 16 * You should have received a copy of the GNU Library General Public 17 * License along with this library; if not, write to the 18 * Free Software Foundation, Inc., 51 Franklin St, Fifth Floor, 19 * Boston, MA 02110-1301, USA. 20 */ 21 22 #ifndef MATHTOOLS_H 23 #define MATHTOOLS_H 24 25 #include <glib.h> 26 27 #define _double2fixmagic (68719476736.0*1.5) 28 /* 2^36 * 1.5, (52-_shiftamt=36) uses limited precisicion to floor */ 29 #define _shiftamt 16 30 /* 16.16 fixed point representation */ 31 32 #if G_BYTE_ORDER == G_BIG_ENDIAN 33 #define iexp_ 0 34 #define iman_ 1 35 #else 36 #define iexp_ 1 37 #define iman_ 0 38 #endif /* BigEndian_ */ 39 40 /* TODO: this optimization is very efficient: put it again when all works 41 #ifdef HAVE_MMX 42 #define F2I(dbl,i) {double d = dbl + _double2fixmagic; i = ((int*)&d)[iman_] >> _shiftamt;} 43 #else*/ 44 #define F2I(dbl,i) i=(int)dbl; 45 /*#endif*/ 46 47 #if 0 48 #define SINCOS(f,s,c) \ 49 __asm__ __volatile__ ("fsincos" : "=t" (c), "=u" (s) : "0" (f)) 50 #else 51 #define SINCOS(f,s,c) {s=sin(f);c=cos(f);} 52 #endif 53 54 extern float sin256[256]; 55 extern float cos256[256]; 56 57 #endif 58 59