/**
 * 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."
 *
 * @file glTextureContext_src.h
 * @author drose
 * @date 1999-10-07
 */

#include "pandabase.h"
#include "textureContext.h"
#include "deletedChain.h"
#include "samplerState.h"

class CLP(GraphicsStateGuardian);
class CLP(SamplerContext);

/**
 *
 */
class EXPCL_GL CLP(TextureContext) : public TextureContext {
public:
  INLINE CLP(TextureContext)(CLP(GraphicsStateGuardian) *glgsg,
                             PreparedGraphicsObjects *pgo,
                             Texture *tex, int view);
  ALLOC_DELETED_CHAIN(CLP(TextureContext));

  virtual ~CLP(TextureContext)();
  virtual void evict_lru();
  void reset_data();

  virtual uint64_t get_native_id() const;
  virtual uint64_t get_native_buffer_id() const;

#ifndef OPENGLES
  void make_handle_resident();
  GLuint64 get_handle();
#endif

#ifdef OPENGLES_1
  static constexpr bool needs_barrier(GLbitfield barrier) { return false; };
#else
  bool needs_barrier(GLbitfield barrier);
  void mark_incoherent(bool wrote);
#endif

  // This is the GL "name" of the texture object.
  GLuint _index;

  // This is only used for buffer textures.
  GLuint _buffer;

#ifndef OPENGLES
  // This is the bindless "handle" to the texture object.
  GLuint64 _handle;
  bool _handle_resident;
#endif

  // These are the parameters that we specified with the last glTexImage2D()
  // or glTexStorage2D() call.  If none of these have changed, we can reload
  // the texture image with a glTexSubImage2D().
  bool _has_storage;
  bool _immutable;
  bool _uses_mipmaps;
  bool _generate_mipmaps;
  GLint _internal_format;
  GLsizei _width;
  GLsizei _height;
  GLsizei _depth;
  GLenum _target;
  SamplerState _active_sampler;

  CLP(GraphicsStateGuardian) *_glgsg;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    TextureContext::init_type();
    register_type(_type_handle, CLASSPREFIX_QUOTED "TextureContext",
                  TextureContext::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 "glTextureContext_src.I"