From 7b09710392d35fb55b52031d447a542d99fc6b4b Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Tue, 19 Aug 2014 17:10:03 -0400
Subject: Modularize the libdimension codebase.

---
 libdimension/model/object.c | 110 ++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 110 insertions(+)
 create mode 100644 libdimension/model/object.c

(limited to 'libdimension/model/object.c')

diff --git a/libdimension/model/object.c b/libdimension/model/object.c
new file mode 100644
index 0000000..0473f54
--- /dev/null
+++ b/libdimension/model/object.c
@@ -0,0 +1,110 @@
+/*************************************************************************
+ * 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
+ * Objects.
+ */
+
+#include "internal.h"
+#include "dimension/model.h"
+#include <stdlib.h>
+
+// Allocate a dummy object
+dmnsn_object *
+dmnsn_new_object(dmnsn_pool *pool)
+{
+  dmnsn_object *object = DMNSN_PALLOC(pool, dmnsn_object);
+  dmnsn_init_object(object);
+  return object;
+}
+
+// Initialize a dmnsn_object field
+void
+dmnsn_init_object(dmnsn_object *object)
+{
+  object->vtable = NULL;
+  object->texture = NULL;
+  object->interior = NULL;
+  object->trans = dmnsn_identity_matrix();
+  object->intrinsic_trans = dmnsn_identity_matrix();
+  object->children = NULL;
+  object->split_children = false;
+  object->precomputed = false;
+}
+
+/// Recursively precompute objects.
+static void
+dmnsn_object_precompute_recursive(dmnsn_object *object, dmnsn_matrix pigment_trans)
+{
+  dmnsn_assert(!object->precomputed, "Object double-precomputed.");
+  object->precomputed = true;
+
+  const dmnsn_object_vtable *vtable = object->vtable;
+  dmnsn_assert(vtable->intersection_fn, "Missing intersection function.");
+  dmnsn_assert(vtable->inside_fn, "Missing inside function.");
+  dmnsn_assert(vtable->bounding_fn || vtable->precompute_fn, "Missing bounding and precompute function.");
+
+  // Initialize the texture
+  if (!object->texture->initialized) {
+    dmnsn_texture_initialize(object->texture);
+  }
+
+  dmnsn_matrix total_trans = dmnsn_matrix_mul(object->trans, object->intrinsic_trans);
+
+  // Precompute the object's children
+  if (object->children) {
+    DMNSN_ARRAY_FOREACH (dmnsn_object **, child, object->children) {
+      dmnsn_matrix saved_trans = (*child)->trans;
+      (*child)->trans = dmnsn_matrix_mul(total_trans, saved_trans);
+
+      dmnsn_matrix child_pigment_trans;
+      if ((*child)->texture == NULL || (*child)->texture->pigment == NULL) {
+        // Don't transform cascaded pigments with the child object
+        child_pigment_trans = pigment_trans;
+      } else {
+        child_pigment_trans = dmnsn_matrix_inverse((*child)->trans);
+      }
+
+      dmnsn_texture_cascade(object->texture, &(*child)->texture);
+      dmnsn_interior_cascade(object->interior, &(*child)->interior);
+      dmnsn_object_precompute_recursive(*child, child_pigment_trans);
+      (*child)->trans = saved_trans;
+    }
+  }
+
+  // Precalculate object values
+  object->pigment_trans = pigment_trans;
+  object->trans_inv = dmnsn_matrix_inverse(total_trans);
+  if (vtable->bounding_fn) {
+    object->aabb = vtable->bounding_fn(object, total_trans);
+  }
+  if (vtable->precompute_fn) {
+    vtable->precompute_fn(object);
+  }
+}
+
+// Precompute object properties
+void
+dmnsn_object_precompute(dmnsn_object *object)
+{
+  dmnsn_matrix pigment_trans = dmnsn_matrix_inverse(object->trans);
+  dmnsn_object_precompute_recursive(object, pigment_trans);
+}
-- 
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