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/*************************************************************************
* Copyright (C) 2010 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 payload type. */
typedef struct dmnsn_point_light_payload {
dmnsn_vector origin;
dmnsn_color color;
} dmnsn_point_light_payload;
/** Point light direction callback. */
static dmnsn_line
dmnsn_point_light_direction_fn(const dmnsn_light *light, dmnsn_vector v)
{
dmnsn_point_light_payload *payload = light->ptr;
return dmnsn_new_line(v, dmnsn_vector_sub(payload->origin, v));
}
/** Point light illumination callback. */
static dmnsn_color
dmnsn_point_light_illumination_fn(const dmnsn_light *light, dmnsn_vector v)
{
dmnsn_point_light_payload *payload = light->ptr;
return payload->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_vector x0, dmnsn_color color)
{
dmnsn_light *light = dmnsn_new_light();
dmnsn_point_light_payload *payload
= dmnsn_malloc(sizeof(dmnsn_point_light_payload));
payload->origin = x0;
payload->color = color;
light->ptr = payload;
light->direction_fn = dmnsn_point_light_direction_fn;
light->illumination_fn = dmnsn_point_light_illumination_fn;
light->shadow_fn = dmnsn_point_light_shadow_fn;
light->free_fn = dmnsn_free;
return light;
}
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