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17 Bit Software 6: Level 6
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17 Bit - Level 6 (1998)(Epic Marketing)[!].iso
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quartz
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q0429.dms
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libray
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libtext
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checker.c
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C/C++ Source or Header
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1991-08-08
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1KB
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60 lines
/*
* 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: checker.c,v 4.0 91/07/17 14:41:48 kolb Exp Locker: kolb $
*
* $Log: checker.c,v $
* Revision 4.0 91/07/17 14:41:48 kolb
* Initial version.
*
*/
#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;
Geom *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. */
}