gls_display_list.h

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/*! \file
  \brief  The disti::GlsDisplayList class.
 
  \par Copyright Information
 
  Copyright (c) 2017 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()
        : _valid( false )
        , _useList( true )
        , _handle( 0 )
    {
    }
 
    /// Assignment operator
    /// \param oldClass The list to copy from.
    /// \return The resulting list (this).
    GlsDisplayList& operator=( const GlsDisplayList& oldClass )
    {
        _useList = oldClass._useList;
        _valid   = false;
        _handle  = 0;
 
        return *this;
    }
 
    ~GlsDisplayList()
    {
        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()
    {
        if( _valid )
        {
            glDeleteLists( _handle, 1 );
            _valid  = false;
            _handle = 0;
        }
    }
 
    /** Allocate an OpenGL display list, deallocating any existing list  */
    void Allocate()
    {
        Invalidate();
        _handle = glGenLists( 1 );
        _valid  = true;
    }
 
    /** Start writing into the display list */
    void Start() { glNewList( _handle, GL_COMPILE ); }
 
    /** Stop writing into the display list and save it */
    void End() { glEndList(); }
 
    /** Draw what's in the display list */
    void Invoke() { glCallList( _handle ); }
 
    /// \returns true if the list is valid
    bool Valid() { return _valid; }
 
    /// Set whether or not the list is valid.
    /// \note Be careful when setting this to true. Make sure the list really is valid.
    /// \param val The new validity of the list.
    void Valid( const bool& val ) { _valid = val; }
 
    /// \return True if this display list is enabled.
    bool UseList() { return _useList; }
 
    /// Set whether or not this display list is enabled.
    /// \param val The new enabled state of the list.
    void UseList( const bool& val ) { _useList = val; }
};
 
} // namespace disti
 
#endif