Add leopard pigment.

4 files changed, 56 insertions, 1 deletions

diff --git a/libdimension/Makefile.am b/libdimension/Makefile.am
index 31db52a..fbefa40 100644
--- a/libdimension/Makefile.am
+++ b/libdimension/Makefile.am
@@ -81,6 +81,7 @@ libdimension_la_SOURCES = $(nobase_include_HEADERS)                            \
                           inline.c                                             \
                           interior.c                                           \
                           lambertian.c                                         \
+                          leopard.c                                            \
                           light.c                                              \
                           malloc.c                                             \
                           map.c                                                \
diff --git a/libdimension/dimension/patterns.h b/libdimension/dimension/patterns.h
index 5506941..a9beba9 100644
--- a/libdimension/dimension/patterns.h
+++ b/libdimension/dimension/patterns.h
@@ -37,3 +37,9 @@ dmnsn_pattern *dmnsn_new_checker_pattern(void);
  * @return A gradient pattern.
  */
 dmnsn_pattern *dmnsn_new_gradient_pattern(dmnsn_vector orientation);
+
+/**
+ * A leopard pattern.
+ * @return A leopard pattern.
+ */
+dmnsn_pattern *dmnsn_new_leopard_pattern(void);
diff --git a/libdimension/leopard.c b/libdimension/leopard.c
new file mode 100644
index 0000000..48986b4
--- /dev/null
+++ b/libdimension/leopard.c
@@ -0,0 +1,48 @@
+/*************************************************************************
+ * Copyright (C) 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
+ * Leopard pattern.
+ */
+
+#include "dimension.h"
+#include <math.h>
+
+/** Leopard pattern callback. */
+static double
+dmnsn_leopard_pattern_fn(const dmnsn_pattern *leopard, dmnsn_vector v)
+{
+  double val = (sin(v.x) + sin(v.y) + sin(v.z))/3.0;
+  return val*val;
+}
+
+/** The singleton instance. */
+static dmnsn_pattern dmnsn_leopard_instance = {
+  .pattern_fn = dmnsn_leopard_pattern_fn,
+  .refcount = 1,
+};
+
+dmnsn_pattern *
+dmnsn_new_leopard_pattern(void)
+{
+  DMNSN_INCREF(&dmnsn_leopard_instance);
+  return &dmnsn_leopard_instance;
+}
diff --git a/libdimension/prtree.c b/libdimension/prtree.c
index 06cecf9..4c7a2e5 100644
--- a/libdimension/prtree.c
+++ b/libdimension/prtree.c
@@ -59,7 +59,7 @@ typedef struct dmnsn_prnode {
 
 /** Construct an empty PR-node. */
 static inline dmnsn_prnode *
-dmnsn_new_prnode()
+dmnsn_new_prnode(void)
 {
   dmnsn_prnode *node = dmnsn_malloc(sizeof(dmnsn_prnode));
   node->bounding_box = dmnsn_zero_bounding_box();