Promote PrimitiveSetIndirect's VBO to a target explicited DIBO (in order to benefit from BOSet queue management)

include/osg/BufferObject

@@ -635,6 +635,28 @@ class OSG_EXPORT ElementBufferObject : public BufferObject
         virtual ~ElementBufferObject();
 };
 
+class OSG_EXPORT DrawIndirectBufferObject : public BufferObject
+{
+    public:
+
+        DrawIndirectBufferObject();
+
+        /** Copy constructor using CopyOp to manage deep vs shallow copy.*/
+        DrawIndirectBufferObject(const DrawIndirectBufferObject& vbo,const CopyOp& copyop=CopyOp::SHALLOW_COPY);
+
+        META_Object(osg,DrawIndirectBufferObject);
+
+        unsigned int addArray(osg::Array* array);
+        void removeArray(osg::Array* array);
+
+        void setArray(unsigned int i, Array* array);
+        Array* getArray(unsigned int i);
+        const Array* getArray(unsigned int i) const;
+
+    protected:
+        virtual ~DrawIndirectBufferObject();
+};
+
 class Image;
 class OSG_EXPORT PixelBufferObject : public BufferObject
 {