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/*************************************************************************
* Copyright (C) 2010-2014 Tavian Barnes <tavianator@tavianator.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/>. *
*************************************************************************/
/**
* @file
* Diffuse finish.
*/
#include "dimension.h"
#include <math.h>
#include <stdlib.h>
/** Lambertian diffuse type. */
typedef struct dmnsn_lambertian {
dmnsn_diffuse diffuse;
double coeff;
} dmnsn_lambertian;
/** Diffuse finish callback. */
static dmnsn_color
dmnsn_lambertian_diffuse_fn(const dmnsn_diffuse *diffuse,
dmnsn_color light, dmnsn_color color,
dmnsn_vector ray, dmnsn_vector normal)
{
const dmnsn_lambertian *lambertian = (const dmnsn_lambertian *)diffuse;
double diffuse_factor = fabs((lambertian->coeff)*dmnsn_vector_dot(ray, normal));
return dmnsn_color_mul(diffuse_factor, dmnsn_color_illuminate(light, color));
}
dmnsn_diffuse *
dmnsn_new_lambertian(dmnsn_pool *pool, double coeff)
{
dmnsn_lambertian *lambertian = DMNSN_PALLOC(pool, dmnsn_lambertian);
lambertian->coeff = coeff;
dmnsn_diffuse *diffuse = &lambertian->diffuse;
dmnsn_init_diffuse(diffuse);
diffuse->diffuse_fn = dmnsn_lambertian_diffuse_fn;
return diffuse;
}
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