gls_display_list.h

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/*! \file
  \brief  The disti::GlsDisplayList class.

  \par Copyright Information

  Copyright (c) 2015 by The DiSTI Corporation.<br>
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  NO WARRANTY. THE SOFTWARE IS PROVIDED "AS-IS," WITHOUT WARRANTY OF ANY KIND,
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*/
#ifndef _GLS_DISPLAY_LIST_H
#define _GLS_DISPLAY_LIST_H
#include "display.h"

namespace disti
{

/**
  The GlsDisplayList class.  Manages an OpenGL display list.
*/

class GlsDisplayList
{
protected:
    bool         _valid;    /**< True if this list is valid */
    bool         _useList;  /**< True if this list is enabled */
    unsigned int _handle;   /**< The OpenGL list handle for this list */

public:
    GlsDisplayList(void) :
        _valid(false),
        _useList(true),
        _handle(0)
    {
    }

    GlsDisplayList& operator = (const GlsDisplayList &oldClass)
    {
        _useList = oldClass._useList;
        _valid = false;
        _handle = 0;

        return *this;
    }

    ~GlsDisplayList(void)
    {
        Invalidate();
    }

    /** Invalidate the display list.  An object with an invalid display list should
      * reinvoke its draw code to rebuild the display list.  Also deallocates the OpenGL list.
      */
    void Invalidate(void)
    {
        if (_valid)
        {
            glDeleteLists(_handle,1);
            _valid = false;
            _handle = 0;
        }
    }

    /** Allocate an OpenGL display list, deallocating any existing list  */
    void Allocate(void)
    {
        Invalidate();
        _handle = glGenLists(1);
        _valid = true;
    }
    
    /** Start writing into the display list */
    void Start(void) { glNewList(_handle,GL_COMPILE); }

    /** Stop writing into the display list and save it */
    void End(void) { glEndList(); }

    /** Draw what's in the display list */
    void Invoke(void) { glCallList(_handle); }

    /** Returns true if the list is valid */
    bool Valid(void) { return _valid; }
    
    /** Set wether or not the list is valid.  Be careful when 
      * setting this to true.  Make sure the list really is valid
      */
    void Valid(const bool &val) { _valid = val; }

    /** Returns true if this display list is enabled */
    bool UseList(void) { return _useList; }

    /** Set whether or not this display list is enabled */
    void UseList(const bool &val) { _useList = val; }

};

} // namespace disti

#endif