From 708954192219feead526f84c0c8bdb29088aeae0 Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@tavianator.com>
Date: Fri, 6 Jun 2014 14:14:00 -0400
Subject: objects: Use a vtable to shrink object structs.

---
 libdimension/csg.c | 47 ++++++++++++++++++++++++++++++++---------------
 1 file changed, 32 insertions(+), 15 deletions(-)

(limited to 'libdimension/csg.c')

diff --git a/libdimension/csg.c b/libdimension/csg.c
index a8d0acc..e4ee672 100644
--- a/libdimension/csg.c
+++ b/libdimension/csg.c
@@ -65,6 +65,13 @@ dmnsn_csg_union_initialize_fn(dmnsn_object *object)
   csg->object.bounding_box = dmnsn_bvh_bounding_box(bvh);
 }
 
+/** CSG union vtable. */
+static const dmnsn_object_vtable dmnsn_csg_union_vtable = {
+  .intersection_fn = dmnsn_csg_union_intersection_fn,
+  .inside_fn = dmnsn_csg_union_inside_fn,
+  .initialize_fn = dmnsn_csg_union_initialize_fn,
+};
+
 /** CSG union destruction callback. */
 static void
 dmnsn_csg_union_cleanup(void *ptr)
@@ -83,11 +90,9 @@ dmnsn_new_csg_union(dmnsn_pool *pool, dmnsn_array *objects)
   dmnsn_object *object = &csg->object;
   dmnsn_init_object(object);
 
+  object->vtable = &dmnsn_csg_union_vtable;
   object->children = objects;
   object->split_children = true;
-  object->intersection_fn = dmnsn_csg_union_intersection_fn;
-  object->inside_fn = dmnsn_csg_union_inside_fn;
-  object->initialize_fn = dmnsn_csg_union_initialize_fn;
 
   return object;
 }
@@ -202,19 +207,23 @@ dmnsn_csg_intersection_initialize_fn(dmnsn_object *csg)
     = dmnsn_vector_min(A->bounding_box.max, B->bounding_box.max);
 }
 
+/** CSG intersection vtable. */
+static const dmnsn_object_vtable dmnsn_csg_intersection_vtable = {
+  .intersection_fn = dmnsn_csg_intersection_intersection_fn,
+  .inside_fn = dmnsn_csg_intersection_inside_fn,
+  .initialize_fn = dmnsn_csg_intersection_initialize_fn,
+};
+
 dmnsn_object *
 dmnsn_new_csg_intersection(dmnsn_pool *pool, dmnsn_object *A, dmnsn_object *B)
 {
   dmnsn_object *csg = dmnsn_new_object(pool);
+  csg->vtable = &dmnsn_csg_intersection_vtable;
 
   csg->children = DMNSN_PALLOC_ARRAY(pool, dmnsn_object *);
   dmnsn_array_push(csg->children, &A);
   dmnsn_array_push(csg->children, &B);
 
-  csg->intersection_fn = dmnsn_csg_intersection_intersection_fn;
-  csg->inside_fn = dmnsn_csg_intersection_inside_fn;
-  csg->initialize_fn = dmnsn_csg_intersection_initialize_fn;
-
   return csg;
 }
 
@@ -250,19 +259,23 @@ dmnsn_csg_difference_initialize_fn(dmnsn_object *csg)
   csg->bounding_box = A->bounding_box;
 }
 
+/** CSG difference vtable. */
+static const dmnsn_object_vtable dmnsn_csg_difference_vtable = {
+  .intersection_fn = dmnsn_csg_difference_intersection_fn,
+  .inside_fn = dmnsn_csg_difference_inside_fn,
+  .initialize_fn = dmnsn_csg_difference_initialize_fn,
+};
+
 dmnsn_object *
 dmnsn_new_csg_difference(dmnsn_pool *pool, dmnsn_object *A, dmnsn_object *B)
 {
   dmnsn_object *csg = dmnsn_new_object(pool);
+  csg->vtable = &dmnsn_csg_difference_vtable;
 
   csg->children = DMNSN_PALLOC_ARRAY(pool, dmnsn_object *);
   dmnsn_array_push(csg->children, &A);
   dmnsn_array_push(csg->children, &B);
 
-  csg->intersection_fn = dmnsn_csg_difference_intersection_fn;
-  csg->inside_fn       = dmnsn_csg_difference_inside_fn;
-  csg->initialize_fn   = dmnsn_csg_difference_initialize_fn;
-
   return csg;
 }
 
@@ -302,18 +315,22 @@ dmnsn_csg_merge_initialize_fn(dmnsn_object *csg)
     = dmnsn_vector_max(A->bounding_box.max, B->bounding_box.max);
 }
 
+/** CSG merge vtable. */
+static const dmnsn_object_vtable dmnsn_csg_merge_vtable = {
+  .intersection_fn = dmnsn_csg_merge_intersection_fn,
+  .inside_fn = dmnsn_csg_merge_inside_fn,
+  .initialize_fn = dmnsn_csg_merge_initialize_fn,
+};
+
 dmnsn_object *
 dmnsn_new_csg_merge(dmnsn_pool *pool, dmnsn_object *A, dmnsn_object *B)
 {
   dmnsn_object *csg = dmnsn_new_object(pool);
+  csg->vtable = &dmnsn_csg_merge_vtable;
 
   csg->children = DMNSN_PALLOC_ARRAY(pool, dmnsn_object *);
   dmnsn_array_push(csg->children, &A);
   dmnsn_array_push(csg->children, &B);
 
-  csg->intersection_fn = dmnsn_csg_merge_intersection_fn;
-  csg->inside_fn       = dmnsn_csg_merge_inside_fn;
-  csg->initialize_fn   = dmnsn_csg_merge_initialize_fn;
-
   return csg;
 }
-- 
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