posixGraphicsStateGuardian.h

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/**
 * 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 posixGraphicsStateGuardian.h
 * @author drose
 * @date 2012-01-14
 */

#ifndef POSIXGRAPHICSSTATEGUARDIAN_H
#define POSIXGRAPHICSSTATEGUARDIAN_H

#include "pandabase.h"

#include "glgsg.h"

/**
 * This GSG is used only for CallbackGraphicsWindow (which might not be using
 * the glx interfaces), to add the ability to peek in libGL.so to find the
 * extension functions.
 */
class PosixGraphicsStateGuardian : public GLGraphicsStateGuardian {
public:
  PosixGraphicsStateGuardian(GraphicsEngine *engine, GraphicsPipe *pipe);
  ~PosixGraphicsStateGuardian();

protected:
  virtual void *do_get_extension_func(const char *name);
  void *get_system_func(const char *name);

private:
  void *_libgl_handle;

public:
  static TypeHandle get_class_type() {
    return _type_handle;
  }
  static void init_type() {
    GLGraphicsStateGuardian::init_type();
    register_type(_type_handle, "PosixGraphicsStateGuardian",
                  GLGraphicsStateGuardian::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 "posixGraphicsStateGuardian.I"

#endif