[cogl] Add cogl_primitive_copy()

[Neil Roberts <nroberts src gnome org>]

commit 146803c191058330675d493822a331824ab3478a
Author: Neil Roberts <neil linux intel com>
Date:   Mon Feb 6 12:52:18 2012 +0000

    Add cogl_primitive_copy()
    
    This adds a public function to make a copy of a primitive. The copy is
    shallow which means it will share the same attributes and attribute
    buffers. This could be useful for code that wants to have multiple
    similar primitives with slightly modified properties.
    
    Reviewed-by: Robert Bragg <robert linux intel com>

 cogl/cogl-primitive.c                              |   16 ++++++++++++++++
 cogl/cogl-primitive.h                              |   15 +++++++++++++++
 .../cogl-2.0-experimental-sections.txt             |    1 +
 3 files changed, 32 insertions(+), 0 deletions(-)
---
diff --git a/cogl/cogl-primitive.c b/cogl/cogl-primitive.c
index a88f189..10983cd 100644
--- a/cogl/cogl-primitive.c
+++ b/cogl/cogl-primitive.c
@@ -525,6 +525,22 @@ cogl_primitive_set_indices (CoglPrimitive *primitive,
 }
 
 CoglPrimitive *
+cogl_primitive_copy (CoglPrimitive *primitive)
+{
+  CoglPrimitive *copy;
+
+  copy = cogl_primitive_new_with_attributes (primitive->mode,
+                                             primitive->n_vertices,
+                                             primitive->attributes,
+                                             primitive->n_attributes);
+
+  cogl_primitive_set_indices (copy, primitive->indices, primitive->n_vertices);
+  cogl_primitive_set_first_vertex (copy, primitive->first_vertex);
+
+  return copy;
+}
+
+CoglPrimitive *
 _cogl_primitive_immutable_ref (CoglPrimitive *primitive)
 {
   int i;
diff --git a/cogl/cogl-primitive.h b/cogl/cogl-primitive.h
index c9529a0..62293ab 100644
--- a/cogl/cogl-primitive.h
+++ b/cogl/cogl-primitive.h
@@ -775,6 +775,21 @@ cogl_primitive_set_indices (CoglPrimitive *primitive,
                             int n_indices);
 
 /**
+ * cogl_primitive_copy:
+ * @primitive: A primitive copy
+ *
+ * Makes a copy of an existing #CoglPrimitive. Note that the primitive
+ * is a shallow copy which means it will use the same attributes and
+ * attribute buffers as the original primitive.
+ *
+ * Return value: the new primitive
+ * Since: 1.10
+ * Stability: unstable
+ */
+CoglPrimitive *
+cogl_primitive_copy (CoglPrimitive *primitive);
+
+/**
  * cogl_primitive_draw:
  * @primitive: A #CoglPrimitive object
  *
diff --git a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
index a81e201..c6f0c2b 100644
--- a/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
+++ b/doc/reference/cogl-2.0-experimental/cogl-2.0-experimental-sections.txt
@@ -237,6 +237,7 @@ cogl_primitive_set_mode
 cogl_primitive_set_attributes
 cogl_primitive_set_indices
 cogl_primitive_draw
+cogl_primitive_copy
 </SECTION>
 
 <SECTION>