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/*
* checker.c
*
* 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".
*
* $Id$
*
* $Log$
*/
#include "texture.h"
#include "checker.h"
/*
* Create and return a reference to a "checker" texture.
*/
Checker *
CheckerCreate(surf)
Surface *surf;
{
Checker *checker;
checker = (Checker *)Malloc(sizeof(checker));
checker->surf = surf;
return checker;
}
/*
* Apply a "checker" texture.
*/
void
CheckerApply(checker, prim, ray, pos, norm, gnorm, surf)
Checker *checker;
Object *prim;
Ray *ray;
Vector *pos, *norm, *gnorm;
Surface *surf;
{
int xp, yp, zp;
xp = pos->x > 0. ? pos->x : 1. - pos->x;
yp = pos->y > 0. ? pos->y : 1. - pos->y;
zp = pos->z > 0. ? pos->z : 1. - pos->z;
if ((xp + yp + zp) % 2)
*surf = *checker->surf;
/* else surface stays the same. */
}
These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.