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/* $Id: mmath.h,v 1.2 1997/05/03 00:54:31 brianp Exp $ */
/*
* Mesa 3-D graphics library
* Version: 2.3
* Copyright (C) 1995-1997 Brian Paul
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Library General Public
* License as published by the Free Software Foundation; either
* version 2 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Library General Public License for more details.
*
* You should have received a copy of the GNU Library General Public
* License along with this library; if not, write to the Free
* Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
/*
* $Log: mmath.h,v $
* Revision 1.2 1997/05/03 00:54:31 brianp
* fixed a comment
*
* Revision 1.1 1997/05/01 01:42:38 brianp
* Initial revision
*
*/
/*
* Faster arithmetic functions. If the FAST_MATH preprocessor symbol is
* defined on the command line (-DFAST_MATH) then we'll use some (hopefully)
* faster functions for sqrt(), etc.
*/
#ifndef MMATH_H
#define MMATH_H
#include <math.h>
extern float gl_sqrt(float x);
#ifdef FAST_MATH
# define GL_SQRT(X) gl_sqrt(X)
#else
# define GL_SQRT(X) sqrt(X)
#endif
/* Normalize a 3-element vector to unit length */
#define NORMALIZE_3FV( V ) \
{ \
GLfloat len; \
len = GL_SQRT(V[0]*V[0]+V[1]*V[1]+V[2]*V[2]); \
if (len>0.0001F) { \
len = 1.0F / len; \
V[0] *= len; \
V[1] *= len; \
V[2] *= len; \
} \
}
extern void gl_init_math(void);
#endif
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