Modularize the libdimension codebase.

5 files changed, 336 insertions, 0 deletions

diff --git a/libdimension/pattern/checker.c b/libdimension/pattern/checker.c
new file mode 100644
index 0000000..cce9623
--- /dev/null
+++ b/libdimension/pattern/checker.c
@@ -0,0 +1,63 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 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
+ * Checker pattern.
+ */
+
+#include "dimension/pattern.h"
+
+/// Checker pattern callback.
+static double
+dmnsn_checker_pattern_fn(const dmnsn_pattern *checker, dmnsn_vector v)
+{
+  double xmod = fmod(v.x, 2.0);
+  double ymod = fmod(v.y, 2.0);
+  double zmod = fmod(v.z, 2.0);
+
+  if (xmod < -dmnsn_epsilon)
+    xmod += 2.0;
+  if (ymod < -dmnsn_epsilon)
+    ymod += 2.0;
+  if (zmod < -dmnsn_epsilon)
+    zmod += 2.0;
+
+  // Return 0 when an even number of coordinates are in [0, 1), 1 otherwise
+  unsigned int n = 0;
+  if (xmod >= 1.0)
+    ++n;
+  if (ymod >= 1.0)
+    ++n;
+  if (zmod >= 1.0)
+    ++n;
+  return (n%2 == 0) ? 0.0 : 1.0;
+}
+
+/// The singleton instance.
+static dmnsn_pattern dmnsn_checker_instance = {
+  .pattern_fn = dmnsn_checker_pattern_fn,
+};
+
+dmnsn_pattern *
+dmnsn_new_checker_pattern(dmnsn_pool *pool)
+{
+  return &dmnsn_checker_instance;
+}
diff --git a/libdimension/pattern/gradient.c b/libdimension/pattern/gradient.c
new file mode 100644
index 0000000..f7a2b97
--- /dev/null
+++ b/libdimension/pattern/gradient.c
@@ -0,0 +1,56 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 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
+ * Gradient pattern.
+ */
+
+#include "dimension/pattern.h"
+
+/// Gradient pattern type.
+typedef struct dmnns_gradient {
+  dmnsn_pattern pattern;
+  dmnsn_vector orientation;
+} dmnsn_gradient;
+
+/// Gradient pattern callback.
+static double
+dmnsn_gradient_pattern_fn(const dmnsn_pattern *pattern, dmnsn_vector v)
+{
+  const dmnsn_gradient *gradient = (const dmnsn_gradient *)pattern;
+  double n = fmod(dmnsn_vector_dot(gradient->orientation, v), 1.0);
+  if (n < -dmnsn_epsilon) {
+    n += 1.0;
+  }
+  return n;
+}
+
+dmnsn_pattern *
+dmnsn_new_gradient_pattern(dmnsn_pool *pool, dmnsn_vector orientation)
+{
+  dmnsn_gradient *gradient = DMNSN_PALLOC(pool, dmnsn_gradient);
+  gradient->orientation = dmnsn_vector_normalized(orientation);
+
+  dmnsn_pattern *pattern = &gradient->pattern;
+  dmnsn_init_pattern(pattern);
+  pattern->pattern_fn = dmnsn_gradient_pattern_fn;
+  return pattern;
+}
diff --git a/libdimension/pattern/leopard.c b/libdimension/pattern/leopard.c
new file mode 100644
index 0000000..1a7bce0
--- /dev/null
+++ b/libdimension/pattern/leopard.c
@@ -0,0 +1,46 @@
+/*************************************************************************
+ * Copyright (C) 2011-2014 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
+ * Leopard pattern.
+ */
+
+#include "dimension/pattern.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,
+};
+
+dmnsn_pattern *
+dmnsn_new_leopard_pattern(dmnsn_pool *pool)
+{
+  return &dmnsn_leopard_instance;
+}
diff --git a/libdimension/pattern/map.c b/libdimension/pattern/map.c
new file mode 100644
index 0000000..ac07960
--- /dev/null
+++ b/libdimension/pattern/map.c
@@ -0,0 +1,126 @@
+/*************************************************************************
+ * Copyright (C) 2010-2014 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
+ * Generic maps.
+ */
+
+#include "internal.h"
+#include "dimension/pattern.h"
+
+/// dmnsn_map definition.
+struct dmnsn_map {
+  size_t obj_size; ///< @internal The size of the mapped objects.
+  dmnsn_array *array; ///< @internal The map entries.
+};
+
+/// An [index, object] pair.
+typedef struct dmnsn_map_entry {
+  double n;
+  char object[];
+} dmnsn_map_entry;
+
+dmnsn_map *
+dmnsn_new_map(dmnsn_pool *pool, size_t size)
+{
+  dmnsn_map *map = DMNSN_PALLOC(pool, dmnsn_map);
+  map->obj_size = size;
+  map->array = dmnsn_palloc_array(pool, sizeof(dmnsn_map_entry) + size);
+  return map;
+}
+
+void
+dmnsn_map_add_entry(dmnsn_map *map, double n, const void *obj)
+{
+  dmnsn_map_entry *entry;
+  DMNSN_ALLOCA(entry, sizeof(dmnsn_map_entry) + map->obj_size);
+
+  entry->n = n;
+  memcpy(entry->object, obj, map->obj_size);
+
+  // Sorted insertion
+  size_t i;
+  for (i = dmnsn_array_size(map->array); i-- > 0;) {
+    dmnsn_map_entry *other = dmnsn_array_at(map->array, i);
+    if (other->n <= n) {
+      break;
+    }
+  }
+
+  dmnsn_array_insert(map->array, i + 1, entry);
+}
+
+size_t
+dmnsn_map_size(const dmnsn_map *map)
+{
+  return dmnsn_array_size(map->array);
+}
+
+void
+dmnsn_map_evaluate(const dmnsn_map *map, double n,
+                   double *val, void *obj1, void *obj2)
+{
+  dmnsn_assert(dmnsn_array_size(map->array) > 0,
+               "Attempt to evaluate empty map.");
+
+  const dmnsn_map_entry *entry = dmnsn_array_first(map->array);
+
+  double n1, n2 = 0.0;
+  const void *o1, *o2 = entry->object;
+
+  if (n < n2) {
+    *val = 0.0;
+    memcpy(obj1, o2, map->obj_size);
+    memcpy(obj2, o2, map->obj_size);
+    return;
+  }
+
+  ptrdiff_t skip = sizeof(dmnsn_map_entry) + map->obj_size;
+  for (const dmnsn_map_entry *last = dmnsn_array_last(map->array);
+       entry <= last;
+       entry = (const dmnsn_map_entry *)((const char *)entry + skip)) {
+    n1 = n2;
+    o1 = o2;
+
+    n2 = entry->n;
+    o2 = entry->object;
+
+    if (n < n2) {
+      *val = (n - n1)/(n2 - n1);
+      memcpy(obj1, o1, map->obj_size);
+      memcpy(obj2, o2, map->obj_size);
+      return;
+    }
+  }
+
+  *val = 1.0;
+  memcpy(obj1, o2, map->obj_size);
+  memcpy(obj2, o2, map->obj_size);
+}
+
+void
+dmnsn_map_apply(dmnsn_map *map, dmnsn_callback_fn *callback)
+{
+  for (size_t i = 0; i < dmnsn_array_size(map->array); ++i) {
+    dmnsn_map_entry *entry = dmnsn_array_at(map->array, i);
+    callback(entry->object);
+  }
+}
diff --git a/libdimension/pattern/pattern.c b/libdimension/pattern/pattern.c
new file mode 100644
index 0000000..60e1ae7
--- /dev/null
+++ b/libdimension/pattern/pattern.c
@@ -0,0 +1,45 @@
+/*************************************************************************
+ * 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.
+ */
+
+#include "dimension/pattern.h"
+
+dmnsn_pattern *
+dmnsn_new_pattern(dmnsn_pool *pool)
+{
+  dmnsn_pattern *pattern = DMNSN_PALLOC(pool, dmnsn_pattern);
+  dmnsn_init_pattern(pattern);
+  return pattern;
+}
+
+void
+dmnsn_init_pattern(dmnsn_pattern *pattern)
+{
+}
+
+double
+dmnsn_pattern_value(const dmnsn_pattern *pattern, dmnsn_vector v)
+{
+  return pattern->pattern_fn(pattern, v);
+}