From f0e6133c246b5a4fe5f4c69b9d7b755581f41dcb Mon Sep 17 00:00:00 2001
From: Tavian Barnes <tavianator@gmail.com>
Date: Thu, 3 Jun 2010 23:27:54 -0600
Subject: Add refcounts to textures and interiors.

---
 libdimension/dimension/interior.h |  3 +++
 libdimension/dimension/texture.h  |  3 +++
 libdimension/interior.c           | 17 ++++++++++++-----
 libdimension/texture.c            | 19 +++++++++++++------
 4 files changed, 31 insertions(+), 11 deletions(-)

diff --git a/libdimension/dimension/interior.h b/libdimension/dimension/interior.h
index 0ab4a30..69a0fcb 100644
--- a/libdimension/dimension/interior.h
+++ b/libdimension/dimension/interior.h
@@ -34,6 +34,9 @@ typedef struct dmnsn_interior {
 
   /* Generic pointer */
   void *ptr;
+
+  /* Reference count */
+  unsigned int *refcount;
 } dmnsn_interior;
 
 dmnsn_interior *dmnsn_new_interior();
diff --git a/libdimension/dimension/texture.h b/libdimension/dimension/texture.h
index ce15742..9c5fae1 100644
--- a/libdimension/dimension/texture.h
+++ b/libdimension/dimension/texture.h
@@ -102,6 +102,9 @@ typedef struct {
 
   /* Transformation matrix */
   dmnsn_matrix trans, trans_inv;
+
+  /* Reference count */
+  unsigned int *refcount;
 } dmnsn_texture;
 
 dmnsn_texture *dmnsn_new_texture();
diff --git a/libdimension/interior.c b/libdimension/interior.c
index 9f9201d..0accb79 100644
--- a/libdimension/interior.c
+++ b/libdimension/interior.c
@@ -26,8 +26,10 @@ dmnsn_interior *
 dmnsn_new_interior()
 {
   dmnsn_interior *interior = dmnsn_malloc(sizeof(dmnsn_interior));
-  interior->ior     = 1.0;
-  interior->free_fn = NULL;
+  interior->ior       = 1.0;
+  interior->free_fn   = NULL;
+  interior->refcount  = dmnsn_malloc(sizeof(unsigned int));
+  *interior->refcount = 1;
   return interior;
 }
 
@@ -36,9 +38,14 @@ void
 dmnsn_delete_interior(dmnsn_interior *interior)
 {
   if (interior) {
-    if (interior->free_fn) {
-      (*interior->free_fn)(interior->ptr);
+    if (*interior->refcount <= 1) {
+      if (interior->free_fn) {
+        (*interior->free_fn)(interior->ptr);
+      }
+      free(interior->refcount);
+      free(interior);
+    } else {
+      --*interior->refcount;
     }
-    free(interior);
   }
 }
diff --git a/libdimension/texture.c b/libdimension/texture.c
index 218b7f6..93279bb 100644
--- a/libdimension/texture.c
+++ b/libdimension/texture.c
@@ -80,9 +80,11 @@ dmnsn_texture *
 dmnsn_new_texture()
 {
   dmnsn_texture *texture = dmnsn_malloc(sizeof(dmnsn_texture));
-  texture->pigment = NULL;
-  texture->finish  = NULL;
-  texture->trans   = dmnsn_identity_matrix();
+  texture->pigment   = NULL;
+  texture->finish    = NULL;
+  texture->trans     = dmnsn_identity_matrix();
+  texture->refcount  = dmnsn_malloc(sizeof(unsigned int));
+  *texture->refcount = 1;
   return texture;
 }
 
@@ -91,9 +93,14 @@ void
 dmnsn_delete_texture(dmnsn_texture *texture)
 {
   if (texture) {
-    dmnsn_delete_finish(texture->finish);
-    dmnsn_delete_pigment(texture->pigment);
-    free(texture);
+    if (*texture->refcount <= 1) {
+      dmnsn_delete_finish(texture->finish);
+      dmnsn_delete_pigment(texture->pigment);
+      free(texture->refcount);
+      free(texture);
+    } else {
+      --*texture->refcount;
+    }
   }
 }
 
-- 
cgit v1.2.3