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MARBLE.C
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C/C++ Source or Header
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1992-04-28
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2KB
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65 lines
/*
* marble.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: marble.c,v 4.0 91/07/17 14:43:06 kolb Exp Locker: kolb $
*
* $Log: marble.c,v $
* Revision 4.0 91/07/17 14:43:06 kolb
* Initial version.
*
*/
#include "texture.h"
#include "marble.h"
MarbleText *
MarbleCreate(mapname)
char *mapname;
{
MarbleText *marble;
marble = (MarbleText *)RayMalloc(sizeof(MarbleText));
if (mapname)
marble->colormap = ColormapRead(mapname);
else
marble->colormap = (Color *)NULL;
return marble;
}
void
MarbleApply(marble, prim, ray, pos, norm, gnorm, surf)
MarbleText *marble;
Geom *prim;
Ray *ray;
Vector *pos, *norm, *gnorm;
Surface *surf;
{
Float val;
int index;
val = Marble(pos);
if (marble->colormap) {
index = (int)(255. * val);
surf->diff.r *= marble->colormap[index].r;
surf->diff.g *= marble->colormap[index].g;
surf->diff.b *= marble->colormap[index].b;
surf->amb.r *= marble->colormap[index].r;
surf->amb.g *= marble->colormap[index].g;
surf->amb.b *= marble->colormap[index].b;
} else {
ColorScale(val, surf->amb, &surf->amb);
ColorScale(val, surf->diff, &surf->diff);
}
}