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+//  FGPanel.hxx - generic support classes for a 2D panel.
+//
+//  Written by David Megginson, started January 2000.
+//  Adopted for standalone fgpanel application by Torsten Dreyer, August 2009
+//
+//  This program is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU General Public License as
+//  published by the Free Software Foundation; either version 2 of the
+//  License, or (at your option) any later version.
+//
+//  This program is distributed in the hope that it will be useful, but
+//  WITHOUT ANY WARRANTY; without even the implied warranty of
+//  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+//  General Public License for more details.
+//
+//  You should have received a copy of the GNU General Public License
+//  along with this program; if not, write to the Free Software
+//  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+//
+//  $Id: FGPanel.hxx,v 1.1 2016/07/20 22:01:30 allaert Exp $
+
+#pragma once
+
+#ifndef __cplusplus
+# error This library requires C++
+#endif
+
+
+#include <simgear/props/propsfwd.hxx>
+#include <simgear/structure/subsystem_mgr.hxx>
+
+#include "FGCroppedTexture.hxx"
+#include "FGPanelInstrument.hxx"
+
+
+////////////////////////////////////////////////////////////////////////
+// Top-level panel.
+////////////////////////////////////////////////////////////////////////
+
+/**
+ * Instrument panel class.
+ *
+ * The panel is a container that has a background texture and holds
+ * zero or more instruments.  The panel will order the instruments to
+ * redraw themselves when necessary, and will pass mouse clicks on to
+ * the appropriate instruments for processing.
+ */
+class FGPanel : public SGSubsystem {
+public:
+    FGPanel (const SGPropertyNode_ptr root);
+    virtual ~FGPanel ();
+
+    // Subsystem API.
+    void init() override;
+    void bind() override;
+    void unbind() override;
+    void update(double dt) override;
+
+    // Subsystem identification.
+    static const char* staticSubsystemClassId() { return "panel"; }
+
+    // transfer pointer ownership!!!
+    virtual void addInstrument (FGPanelInstrument * const instrument);
+
+    // Background texture.
+    virtual void setBackground (const FGCroppedTexture_ptr texture);
+    void setBackgroundWidth (const double d);
+    void setBackgroundHeight (const double d);
+
+    // Background multiple textures.
+    virtual void setMultiBackground (const FGCroppedTexture_ptr texture , const int idx);
+
+    // Full width of panel.
+    virtual void setWidth (const int width);
+    virtual int getWidth () const;
+
+    // Full height of panel.
+    virtual void setHeight (const int height);
+    virtual int getHeight () const;
+
+private:
+    typedef std::vector <FGPanelInstrument *> instrument_list_type;
+    int m_width;
+    int m_height;
+
+    SGPropertyNode_ptr m_flipx;
+
+    FGCroppedTexture_ptr m_bg;
+    double m_bg_width;
+    double m_bg_height;
+    FGCroppedTexture_ptr m_mbg[8];
+    // List of instruments in panel.
+    instrument_list_type m_instruments;
+
+    void getInitDisplayList ();
+
+    static GLuint Textured_Layer_Program_Object;
+    static GLint Textured_Layer_Position_Loc;
+    static GLint Textured_Layer_Tex_Coord_Loc;
+    static GLint Textured_Layer_MVP_Loc;
+    static GLint Textured_Layer_Sampler_Loc;
+};