1 files changed, 62 insertions, 0 deletions
diff --git a/libdimension/dimension/pattern/pattern.h b/libdimension/dimension/pattern/pattern.h
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+/*************************************************************************
+ * Copyright (C) 2009-2014 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
+ * 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. */
+};
+
+/**
+ * Allocate a dummy pattern.
+ * @param[in] pool  The memory pool to allocate from.
+ * @return A pattern with no callbacks set.
+ */
+dmnsn_pattern *dmnsn_new_pattern(dmnsn_pool *pool);
+
+/**
+ * Initialize a dmnsn_pattern field.
+ * @param[out] pattern  The pattern to initialize.
+ */
+void dmnsn_init_pattern(dmnsn_pattern *pattern);
+
+/**
+ * Invoke the pattern callback.
+ * @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);