// Filename: textureContext.h
// Created by:  drose (07Oct99)
//
////////////////////////////////////////////////////////////////////
//
// PANDA 3D SOFTWARE
// Copyright (c) Carnegie Mellon University.  All rights reserved.
//
// All use of this software is subject to the terms of the revised BSD
// license.  You should have received a copy of this license along
// with this source code in a file named "LICENSE."
//
////////////////////////////////////////////////////////////////////

#ifndef TEXTURECONTEXT_H
#define TEXTURECONTEXT_H

#include "pandabase.h"

#include "bufferContext.h"
#include "texture.h"
#include "preparedGraphicsObjects.h"
#include "adaptiveLru.h"

////////////////////////////////////////////////////////////////////
//       Class : TextureContext
// Description : This is a special class object that holds all the
//               information returned by a particular GSG to indicate
//               the texture's internal context identifier.
//
//               Textures typically have an immediate-mode and a
//               retained-mode operation.  When using textures in
//               retained-mode (in response to Texture::prepare()),
//               the GSG will create some internal handle for the
//               texture and store it here.  The texture stores all of
//               these handles internally.
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA_GOBJ TextureContext : public BufferContext, public AdaptiveLruPage {
public:
  INLINE TextureContext(PreparedGraphicsObjects *pgo, Texture *tex);

PUBLISHED:
  INLINE Texture *get_texture() const;

  INLINE bool was_modified() const;
  INLINE bool was_properties_modified() const;
  INLINE bool was_image_modified() const;
  INLINE bool was_simple_image_modified() const;

public:
  INLINE void update_data_size_bytes(size_t new_data_size_bytes);
  INLINE void mark_loaded();
  INLINE void mark_simple_loaded();
  INLINE void mark_unloaded();

  virtual void output(ostream &out) const;
  virtual void write(ostream &out, int indent_level) const;

private:
  // This cannot be a PT(Texture), because the texture and the GSG
  // both own their TextureContexts!  That would create a circular
  // reference count.
  Texture *_texture;
  UpdateSeq _properties_modified;
  UpdateSeq _image_modified;
  UpdateSeq _simple_image_modified;
  
public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    BufferContext::init_type();
    register_type(_type_handle, "TextureContext",
                  BufferContext::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;

  friend class PreparedGraphicsObjects;
};

inline ostream &operator << (ostream &out, const TextureContext &context) {
  context.output(out);
  return out;
}

#include "textureContext.I"

#endif

