Add pattern framework, impelement checker pattern.

4 files changed, 101 insertions, 1 deletions

diff --git a/libdimension/dimension/pattern.h b/libdimension/dimension/pattern.h
new file mode 100644
index 0000000..6301372
--- /dev/null
+++ b/libdimension/dimension/pattern.h
@@ -0,0 +1,55 @@
+/*************************************************************************
+ * Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.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/>.                                       *
+ *************************************************************************/
+
+/*
+ * Patterns
+ */
+
+#ifndef DIMENSION_PATTERN_H
+#define DIMENSION_PATTERN_H
+
+/* Forward-declare dmnsn_pattern */
+typedef struct dmnsn_pattern dmnsn_pattern;
+
+/* Pattern callback */
+typedef double dmnsn_pattern_fn(const dmnsn_pattern *pattern, dmnsn_vector v);
+
+/* Generic pattern */
+struct dmnsn_pattern {
+  /* Callbacks */
+  dmnsn_pattern_fn *pattern_fn;
+  dmnsn_free_fn    *free_fn;
+
+  /* Transformation matrix */
+  dmnsn_matrix trans, trans_inv;
+
+  /* Generic pointer */
+  void *ptr;
+};
+
+dmnsn_pattern *dmnsn_new_pattern(void);
+void dmnsn_delete_pattern(dmnsn_pattern *pattern);
+
+void dmnsn_pattern_init(dmnsn_pattern *pattern);
+
+/* Invoke the pattern callback with the right transformation */
+double dmnsn_pattern_value(const dmnsn_pattern *pattern, dmnsn_vector v);
+
+#endif /* DIMENSION_PATTERN_H */
diff --git a/libdimension/dimension/patterns.h b/libdimension/dimension/patterns.h
new file mode 100644
index 0000000..c6dc08a
--- /dev/null
+++ b/libdimension/dimension/patterns.h
@@ -0,0 +1,30 @@
+/*************************************************************************
+ * Copyright (C) 2009-2010 Tavian Barnes <tavianator@gmail.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/>.                                       *
+ *************************************************************************/
+
+/*
+ * Custom patterns
+ */
+
+#ifndef DIMENSION_PATTERNS_H
+#define DIMENSION_PATTERNS_H
+
+dmnsn_pattern *dmnsn_new_checker_pattern();
+
+#endif /* DIMENSION_PATTERNS_H */
diff --git a/libdimension/dimension/pigments.h b/libdimension/dimension/pigments.h
index f985362..31c0598 100644
--- a/libdimension/dimension/pigments.h
+++ b/libdimension/dimension/pigments.h
@@ -30,4 +30,17 @@ dmnsn_pigment *dmnsn_new_solid_pigment(dmnsn_color color);
 /* An image map */
 dmnsn_pigment *dmnsn_new_canvas_pigment(dmnsn_canvas *canvas);
 
+/* Color maps */
+typedef dmnsn_array dmnsn_color_map;
+
+dmnsn_color_map *dmnsn_new_color_map();
+void dmnsn_delete_color_map(dmnsn_color_map *map);
+
+void dmnsn_add_color_map_entry(dmnsn_color_map *map, double n, dmnsn_color c);
+dmnsn_color dmnsn_color_map_value(const dmnsn_color_map *map, double n);
+
+/* Color-mapped pigments */
+dmnsn_pigment *dmnsn_new_color_map_pigment(dmnsn_pattern *pattern,
+                                           dmnsn_color_map *map);
+
 #endif /* DIMENSION_PIGMENTS_H */
diff --git a/libdimension/dimension/texture.h b/libdimension/dimension/texture.h
index 3d37aa1..98e33b8 100644
--- a/libdimension/dimension/texture.h
+++ b/libdimension/dimension/texture.h
@@ -32,14 +32,16 @@
 /* Forward-declare dmnsn_pigment */
 typedef struct dmnsn_pigment dmnsn_pigment;
 
-/* Pigment callback */
+/* Pigment callbacks */
 typedef dmnsn_color dmnsn_pigment_fn(const dmnsn_pigment *pigment,
                                      dmnsn_vector v);
+typedef void dmnsn_pigment_init_fn(dmnsn_pigment *pigment);
 
 /* dmnsn_pigment definition */
 struct dmnsn_pigment {
   /* Callbacks */
   dmnsn_pigment_fn *pigment_fn;
+  dmnsn_pigment_init_fn *init_fn;
   dmnsn_free_fn *free_fn;
 
   /* Transformation matrix */