// Filename: savedFrameBuffer.h
// Created by:  drose (06Oct99)
//
////////////////////////////////////////////////////////////////////

#ifndef SAVEDFRAMEBUFFER_H
#define SAVEDFRAMEBUFFER_H

#include <pandabase.h>

#include "renderBuffer.h"
#include "displayRegion.h"

#include <typedReferenceCount.h>
#include <pointerTo.h>

////////////////////////////////////////////////////////////////////
// 	 Class : SavedFrameBuffer
// Description : Occasionally we need to save the contents of the
//               frame buffer for restoring later, particularly when
//               we are doing multipass effects.  The precise form in
//               which the frame buffer is optimally saved may vary
//               from one platform to another; hence, we have the
//               SavedFrameBuffer class, which is a placeholder
//               structure to store the frame buffer in whichever way
//               a particular GSG would prefer to do it.
//
//               Each specific GSG will also derive a new kind of
//               SavedFrameBuffer object that it will use to store its
//               frame buffer contents meaningfully.
//
//               This class is not meant to be used directly; it is
//               used within the FrameBufferStack class to support
//               GraphicsStateGuardian::push_frame_buffer() and
//               pop_frame_buffer().
////////////////////////////////////////////////////////////////////
class EXPCL_PANDA SavedFrameBuffer : public TypedReferenceCount {
public:
  INLINE SavedFrameBuffer(const RenderBuffer &buffer,
			  CPT(DisplayRegion) dr);

  RenderBuffer _buffer;
  CPT(DisplayRegion) _display_region;


public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    TypedReferenceCount::init_type();
    register_type(_type_handle, "SavedFrameBuffer",
 		  TypedReferenceCount::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 "savedFrameBuffer.I"

#endif