Category : Printer + Display Graphics
Archive   : RAYSH386.ZIP
Filename : COMMON.H

/*
* common.h
*
* Copyright (C) 1989, 1991, Craig E. Kolb
* All rights reserved.
*
* This software may be freely copied, modified, and redistributed
* provided that this copyright notice is preserved on all copies.
*
* You may not distribute this software, in whole or in part, as part of
* any commercial product without the express consent of the authors.
*
* There is no warranty or other guarantee of fitness of this software
* for any purpose. It is provided solely "as is".
*
* $Id: common.h,v 4.0.1.1 91/11/26 21:34:27 cek Exp Locker: cek $
*
* $Log: common.h,v $
* Revision 4.0.1.1 91/11/26 21:34:27 cek
* patch3: Added EPSILON definition, redefine equal() macro.
*
* Revision 4.0 91/07/17 14:30:18 kolb
* Initial version.
*
*/
#ifndef COMMON_H
#define COMMON_H

#include
#include
#ifdef I_STDLIB
#include
#endif

#if defined(__WATCOMC__) || defined(__BORLANDC__)
#ifndef HUGE
#define HUGE HUGE_VAL
#endif
#include
#endif

#include "config.h"

typedef double Float;

#if (VOIDFLAGS & 8) == 8
typedef void * voidstar;
#else
typedef char * voidstar;
#endif

#include "expr.h"
#include "vector.h"
#include "ray.h"
#include "color.h"
#include "transform.h"
#include "error.h"

#ifndef TRUE
#define TRUE 1
#endif

#ifndef FALSE
#define FALSE 0
#endif

/*
* Various useful constants and macros.
*/

/*
* Minimum vector length & fp value.
* Modify depending upon Float typedef.
*/
#define EPSILON (Float)0.00001

#ifndef PI
#define PI 3.14159265358979323846
#endif
#define TWOPI (2. * PI)
#define INV_TWOPI (1. / TWOPI)
#define deg2rad(x) (Float)(x * PI/180.)
#define LNHALF (-.69314718)

#ifndef NULL
# define NULL 0
#endif

#define UNSET -1

/*
* Some systems, such as the RS6000, have fast fabs already defined.
*/
#ifndef fabs
extern Float RSabstmp;
#define fabs(x) ((RSabstmp=x) < 0 ? -RSabstmp : RSabstmp)
#endif

#ifdef MULTIMAX
/*
* On the multimax, allocate large pieces of memory as shared memory.
*/
extern char *share_malloc(), *share_calloc();
#else
/*
* Otherwise, malloc is malloc, etc.
*/
#define share_malloc(x) RayMalloc(x)
#define share_calloc(x,y) Calloc(x,y)
#endif

/*
* Close enough for us.
*/
#define equal(a, b) (fabs((a) - (b)) < EPSILON)
/*
* Maximum/Minimum functions
*/

#if !defined(__WATCOMC__) && !defined(__BORLANDC__)
#define max(a, b) ((a) > (b) ? (a) : (b))
#define min(a, b) ((a) < (b) ? (a) : (b))
#endif

extern voidstar RayMalloc(), Calloc();
extern char *strsave();

#ifndef __WATCOMC__
extern double drand48(); /* just in case */
#endif

#endif /* COMMON_H */