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Wayzata's Best of Shareware PC/Windows 1
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Wayzata's Best of Shareware for PC-Windows - Release 1 - Wayzata Technology (1993).iso
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RAYSH386
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POINT.C
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C/C++ Source or Header
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1991-07-18
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2KB
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82 lines
/*
* point.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: point.c,v 4.0 91/07/17 14:35:20 kolb Exp Locker: kolb $
*
* $Log: point.c,v $
* Revision 4.0 91/07/17 14:35:20 kolb
* Initial version.
*
*/
#include "light.h"
#include "point.h"
static LightMethods *iPointMethods = NULL;
Pointlight *
PointCreate(pos)
Vector *pos;
{
Pointlight *p;
p = (Pointlight *)share_malloc(sizeof(Pointlight));
p->pos = *pos;
return p;
}
LightMethods *
PointMethods()
{
if (iPointMethods == (LightMethods *)NULL) {
iPointMethods = LightMethodsCreate();
iPointMethods->intens = PointIntens;
iPointMethods->dir = PointDirection;
}
return iPointMethods;
}
int
PointIntens(lp, lcolor, cache, ray, dist, noshadow, color)
Pointlight *lp;
Color *lcolor, *color;
ShadowCache *cache;
Ray *ray;
Float dist;
int noshadow;
{
return !Shadowed(color, lcolor, cache, ray, dist, noshadow);
}
void
PointDirection(lp, pos, dir, dist)
Pointlight *lp;
Vector *pos, *dir;
Float *dist;
{
/*
* Calculate dir from position to center of
* light source.
*/
VecSub(lp->pos, *pos, dir);
*dist = VecNormalize(dir);
}
PointMethodRegister(meth)
UserMethodType meth;
{
if (iPointMethods)
iPointMethods->user = meth;
}