Add precompute callback to objects.

2 files changed, 12 insertions, 4 deletions

diff --git a/libdimension/dimension/object.h b/libdimension/dimension/object.h
index ce57807..3b8768f 100644
--- a/libdimension/dimension/object.h
+++ b/libdimension/dimension/object.h
@@ -48,6 +48,7 @@ typedef struct dmnsn_object dmnsn_object;
 
 /* Object callback types */
 
+typedef void dmnsn_object_precompute_fn(dmnsn_object *object);
 typedef bool dmnsn_object_intersection_fn(const dmnsn_object *object,
                                           dmnsn_line line,
                                           dmnsn_intersection *intersection);
@@ -69,6 +70,7 @@ struct dmnsn_object {
   dmnsn_bounding_box bounding_box;
 
   /* Callback functions */
+  dmnsn_object_precompute_fn   *precompute_fn;
   dmnsn_object_intersection_fn *intersection_fn;
   dmnsn_object_inside_fn       *inside_fn;
   dmnsn_free_fn                *free_fn;
diff --git a/libdimension/object.c b/libdimension/object.c
index 9074d60..acc0163 100644
--- a/libdimension/object.c
+++ b/libdimension/object.c
@@ -37,10 +37,11 @@ dmnsn_object *
 dmnsn_new_object()
 {
   dmnsn_object *object = dmnsn_malloc(sizeof(dmnsn_object));
-  object->texture  = NULL;
-  object->interior = NULL;
-  object->trans    = dmnsn_identity_matrix();
-  object->free_fn  = NULL;
+  object->texture       = NULL;
+  object->interior      = NULL;
+  object->trans         = dmnsn_identity_matrix();
+  object->precompute_fn = NULL;
+  object->free_fn       = NULL;
   return object;
 }
 
@@ -62,9 +63,14 @@ dmnsn_delete_object(dmnsn_object *object)
 void
 dmnsn_object_precompute(dmnsn_object *object)
 {
+  if (object->precompute_fn) {
+    (*object->precompute_fn)(object);
+  }
+
   object->bounding_box
     = dmnsn_transform_bounding_box(object->trans, object->bounding_box);
   object->trans_inv = dmnsn_matrix_inverse(object->trans);
+
   if (object->texture) {
     object->texture->trans
       = dmnsn_matrix_mul(object->trans, object->texture->trans);