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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
* Sky spheres.
*/
/** A sky sphere. */
typedef struct dmnsn_sky_sphere {
/** An array of pigments in inside-to-outside order. */
dmnsn_array *pigments;
dmnsn_matrix trans; /**< Transformation matrix. */
dmnsn_refcount refcount; /**< @internal Reference count. */
} dmnsn_sky_sphere;
/**
* Create a sky sphere.
* @return A new blank sky sphere.
*/
dmnsn_sky_sphere *dmnsn_new_sky_sphere(void);
/**
* Delete a sky sphere.
* @param[in,out] sky_sphere The sky sphere to delete.
*/
void dmnsn_delete_sky_sphere(dmnsn_sky_sphere *sky_sphere);
/**
* Initialize a sky sphere.
* @param[in,out] sky_sphere The sky sphere to initialize.
*/
void dmnsn_initialize_sky_sphere(dmnsn_sky_sphere *sky_sphere);
/**
* Evaluate the color of the sky sphere.
* @param[in] sky_sphere The sky sphere to evaluate.
* @param[in] d The direction to look.
* @return The color of the sky in the direction of \p d.
*/
dmnsn_color dmnsn_sky_sphere_color(const dmnsn_sky_sphere *sky_sphere,
dmnsn_vector d);
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