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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
* Point lights.
*/
#include "dimension.h"
#include <stdlib.h>
/** Point light type. */
typedef struct dmnsn_point_light {
dmnsn_light light;
dmnsn_vector origin;
dmnsn_color color;
} dmnsn_point_light;
/** Point light direction callback. */
static dmnsn_vector
dmnsn_point_light_direction_fn(const dmnsn_light *light, dmnsn_vector v)
{
const dmnsn_point_light *point_light = (const dmnsn_point_light *)light;
return dmnsn_vector_sub(point_light->origin, v);
}
/** Point light illumination callback. */
static dmnsn_color
dmnsn_point_light_illumination_fn(const dmnsn_light *light, dmnsn_vector v)
{
const dmnsn_point_light *point_light = (const dmnsn_point_light *)light;
return point_light->color;
}
/** Point light illumination callback. */
static bool
dmnsn_point_light_shadow_fn(const dmnsn_light *light, double t)
{
return t < 1.0;
}
dmnsn_light *
dmnsn_new_point_light(dmnsn_pool *pool, dmnsn_vector x0, dmnsn_color color)
{
dmnsn_point_light *point_light = DMNSN_PALLOC(pool, dmnsn_point_light);
point_light->origin = x0;
point_light->color = color;
dmnsn_light *light = &point_light->light;
dmnsn_init_light(light);
light->direction_fn = dmnsn_point_light_direction_fn;
light->illumination_fn = dmnsn_point_light_illumination_fn;
light->shadow_fn = dmnsn_point_light_shadow_fn;
return light;
}
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