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/*************************************************************************
* Copyright (C) 2009-2011 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
* Patterns. Patterns are functions which map vectors to scalars, which are
* used for pigments and normals.
*/
/* Forward-declare dmnsn_pattern */
typedef struct dmnsn_pattern dmnsn_pattern;
/**
* Pattern callback.
* @param[in] pattern The pattern itself.
* @param[in] v The point at which to evaluate the pattern.
* @return The value of the pattern at \p v.
*/
typedef double dmnsn_pattern_fn(const dmnsn_pattern *pattern, dmnsn_vector v);
/** A pattern. */
struct dmnsn_pattern {
dmnsn_pattern_fn *pattern_fn; /**< The pattern callback. */
dmnsn_free_fn *free_fn; /**< The destructor callback. */
void *ptr; /**< Generic pointer. */
dmnsn_refcount refcount; /**< @internal Reference count. */
};
/**
* Allocate an dummy pattern.
* @return A pattern with no callbacks set.
*/
dmnsn_pattern *dmnsn_new_pattern(void);
/**
* Delete a pattern.
* @param[in,out] pattern The pattern to destroy.
*/
void dmnsn_delete_pattern(dmnsn_pattern *pattern);
/**
* Invoke the pattern callback with the right transformation.
* @param[in] pattern The pattern to evaluate.
* @param[in] v The point to get the pattern value for.
* @return The value of the pattern at \p v.
*/
double dmnsn_pattern_value(const dmnsn_pattern *pattern, dmnsn_vector v);
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