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/*************************************************************************
* Copyright (C) 2009-2010 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
* Sky spheres.
*/
#include "dimension.h"
dmnsn_sky_sphere *
dmnsn_new_sky_sphere(void)
{
dmnsn_sky_sphere *sky_sphere = dmnsn_malloc(sizeof(dmnsn_sky_sphere));
sky_sphere->pigments = dmnsn_new_array(sizeof(dmnsn_pigment *));
sky_sphere->trans = dmnsn_identity_matrix();
return sky_sphere;
}
void
dmnsn_delete_sky_sphere(dmnsn_sky_sphere *sky_sphere)
{
if (sky_sphere) {
DMNSN_ARRAY_FOREACH (dmnsn_pigment **, pigment, sky_sphere->pigments) {
dmnsn_delete_pigment(*pigment);
}
dmnsn_delete_array(sky_sphere->pigments);
dmnsn_free(sky_sphere);
}
}
void
dmnsn_initialize_sky_sphere(dmnsn_sky_sphere *sky_sphere)
{
DMNSN_ARRAY_FOREACH (dmnsn_pigment **, pigment, sky_sphere->pigments) {
(*pigment)->trans = dmnsn_matrix_mul(sky_sphere->trans, (*pigment)->trans);
dmnsn_initialize_pigment(*pigment);
}
}
dmnsn_color
dmnsn_sky_sphere_color(const dmnsn_sky_sphere *sky_sphere, dmnsn_vector d)
{
dmnsn_color color = dmnsn_black;
color.trans = 1.0;
DMNSN_ARRAY_FOREACH (const dmnsn_pigment **, pigment, sky_sphere->pigments) {
dmnsn_pigment_fn *pigment_fn = (*pigment)->pigment_fn;
if (pigment_fn) {
dmnsn_color sky = (*pigment_fn)(*pigment, d);
color = dmnsn_color_add(dmnsn_color_filter(color, sky), sky);
}
}
return color;
}
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