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/*************************************************************************
* Copyright (C) 2009 Tavian Barnes <tavianator@gmail.com> *
* *
* This file is part of The Dimension Library. *
* *
* The Dimension Library is free software; you can redistribute it and/ *
* or modify it under the terms of the GNU Lesser General Public License *
* as published by the Free Software Foundation; either version 3 of the *
* License, or (at your option) any later version. *
* *
* The Dimension Library is distributed in the hope that it will be *
* useful, but WITHOUT ANY WARRANTY; without even the implied warranty *
* of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU *
* Lesser General Public License for more details. *
* *
* You should have received a copy of the GNU Lesser General Public *
* License along with this program. If not, see *
* <http://www.gnu.org/licenses/>. *
*************************************************************************/
#include "dimension.h"
#include <stdlib.h> /* For malloc */
dmnsn_color
dmnsn_diffuse_finish_fn(const dmnsn_finish *finish,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal,
dmnsn_vector viewer)
{
double diffuse = dmnsn_vector_dot(ray, normal);
dmnsn_color illum = dmnsn_color_illuminate(light, color);
return dmnsn_color_mul(diffuse, illum);
}
/* A diffuse finish */
dmnsn_finish *
dmnsn_new_diffuse_finish()
{
dmnsn_finish *finish = dmnsn_new_finish();
if (finish) {
finish->finish_fn = &dmnsn_diffuse_finish_fn;
}
return finish;
}
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