panda3d/panda/src/gobj/dataContext.h

// Filename: dataContext.h
// Created by:  drose (17Mar05)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) 2001 - 2004, Disney Enterprises, Inc.  All rights reserved
//
// All use of this software is subject to the terms of the Panda 3d
// Software license.  You should have received a copy of this license
// along with this source code; you will also find a current copy of
// the license at http://etc.cmu.edu/panda3d/docs/license/ .
//
// To contact the maintainers of this program write to
// [email protected] .
//
////////////////////////////////////////////////////////////////////

#ifndef DATACONTEXT_H
#define DATACONTEXT_H

#include "pandabase.h"

#include "savedContext.h"
#include "updateSeq.h"

class qpGeomVertexArrayData;

////////////////////////////////////////////////////////////////////
//       Class : DataContext
// Description : This is a special class object that holds all the
//               information returned by a particular GSG to indicate
//               the vertex data array's internal context identifier.
//
//               This allows the GSG to cache the vertex data array in
//               whatever way makes sense.  For instance, DirectX can
//               allocate a vertex buffer for the array.  OpenGL can
//               create a buffer object.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA DataContext : public SavedContext {
public:
  INLINE DataContext(qpGeomVertexArrayData *data);

  // This cannot be a PT(qpGeomVertexArrayData), because the data and
  // the GSG both own their DataContexts!  That would create a
  // circular reference count.
  qpGeomVertexArrayData *_data;
  UpdateSeq _modified;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    SavedContext::init_type();
    register_type(_type_handle, "DataContext",
                  SavedContext::get_class_type());
  }
  virtual TypeHandle get_type() const {
    return get_class_type();
  }
  virtual TypeHandle force_init_type() {init_type(); return get_class_type();}

private:
  static TypeHandle _type_handle;
};

#include "dataContext.I"

#endif