u_macro.h

//------------------------------------------------------------------------
//  Macros
//------------------------------------------------------------------------
//
//  Copyright (C) 2006-2008 Andrew Apted
//
//  This program is free software; you can redistribute it and/or
//  modify it under the terms of the GNU General Public License
//  as published by the Free Software Foundation; either version 2
//  of the License, or (at your option) any later version.
//
//  This program 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 General Public License for more details.
//
//------------------------------------------------------------------------

#ifndef __SYS_MACRO_H__
#define __SYS_MACRO_H__

// basic macros

#ifndef NULL
#define NULL    0  // C++
#endif

#ifndef M_PI
#define M_PI  3.14159265358979323846
#endif

#ifndef MAX
#define MAX(a,b)  ((a) > (b) ? (a) : (b))
#endif

#ifndef MIN
#define MIN(a,b)  ((a) < (b) ? (a) : (b))
#endif

#ifndef ABS
#define ABS(a)  ((a) < 0 ? -(a) : (a))
#endif

#ifndef SGN
#define SGN(a)  ((a) < 0 ? -1 : (a) > 0 ? +1 : 0)
#endif

#ifndef I_ROUND
#define I_ROUND(x)  ((int) (((x) < 0.0f) ? ((x) - 0.5f) : ((x) + 0.5f)))
#endif

#ifndef CLAMP
#define CLAMP(x,low,high)  \
    ((x) < (low) ? (low) : (x) > (high) ? (high) : (x))
#endif

#endif  /* __SYS_MACRO_H__ */

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