gls_lod_group.h

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

  \par Copyright Information

  Copyright (c) 2017 by The DiSTI Corporation.<br>
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*/

#ifndef _GlsLodGroup_H
#define _GlsLodGroup_H

#include <vector>

#include "gls_cpp_lang_support.h"
#include "group.h"

//////////////////// Provides support for creating DLLs ////////////////////////
#if( defined( GLSGEN_EXPORT_GlsLodGroup ) || defined( GLSGEN_IMPORT_GlsLodGroup ) || defined( GLS_EXPORT_GENERATED ) || defined( GLS_IMPORT_GENERATED ) ) \
    && defined( _MSC_VER )
#    if defined( GLSGEN_EXPORT_GlsLodGroup ) || defined( GLS_EXPORT_GENERATED )
#        define GLSGEN_GlsLodGroup_EXPORT __declspec( dllexport )
#    else
#        define GLSGEN_GlsLodGroup_EXPORT __declspec( dllimport )
#    endif
#else
#    define GLSGEN_GlsLodGroup_EXPORT
#endif
///////////////////////////////////////////////////////////////////////////////

#define LIB_BASE_NAME "gls_lod_group"
#include "gls_auto_lib.h"
#undef LIB_BASE_NAME

namespace disti
{
// Forward Declaration
class GlsGloFileAttribute;

typedef enum
{
    GLS_LOD_GROUP_DISTANCE_RANGE = GLS_LAST_INITIALIZER + 1,
    GLS_LOD_GROUP_LOD_POSITIONS
} GLS_LodGroup_Initializers;

/** 
    The GlsLodGroup allows users to set different levels of detail (LOD) for its contents based on how far the group is from the camera.  
    The GlsLodGroup renders a single child, and chooses which child to render based on the distance from the current camera and the values 
    set on each LOD position in the editor.  LODs are only used with perspective cameras.
*/
class GlsLodGroup : public Group
{
public:
    typedef Group _BaseClass;

    friend class GlsLodGroupEditor;

    /** Create a new GlsLodGroup.
      * \param generateInstance  Whether or not to generate an instance name
      * for this inputdevice 
      */
    GLSGEN_GlsLodGroup_EXPORT GlsLodGroup( bool generateInstance = false );

    GLSGEN_GlsLodGroup_EXPORT GlsLodGroup( const GlsLodGroup& that, const bool generateNames );

    /** Destructs a GlsLodGroup object */
    virtual GLSGEN_GlsLodGroup_EXPORT ~GlsLodGroup();

    static GLSGEN_GlsLodGroup_EXPORT DisplayObject* CreateInstance();

    static GLSGEN_GlsLodGroup_EXPORT void GroupDebugCommand( const char* cmd, const char* arg );

    virtual GLSGEN_GlsLodGroup_EXPORT void SetAvailableAttributes( unsigned int value );

    //////////////////////////////////////////////////
    // Overridden base class methods
    // The base class methods are overridden so that the Group Class methods
    // are not called, generally DisplayObject methods are called, there
    // are a few exceptions.
    //////////////////////////////////////////////////

    virtual GLSGEN_GlsLodGroup_EXPORT void Draw( void );
    virtual GLSGEN_GlsLodGroup_EXPORT void PreDraw( const OpenGLMatrices& parentMatrices, Culler& culler );

    virtual GLSGEN_GlsLodGroup_EXPORT int NumLods();

    /** Adds the specified object into the group, at the end of the list
      * \param obj  A pointer to the object to add
      * \param reparent  Whether or not the object parent should be set to this group
      * \param recalculateBoundingbox  Whether or not to recalculate the bounding box
      * \param loc  Where to insert it (defaults to -1 which means at the end of the list)
      */
    virtual GLSGEN_GlsLodGroup_EXPORT void InsertObject( DisplayObject* obj, bool reparent = true, bool recalculateBoundingbox = true, int loc = -1 );

    virtual GLSGEN_GlsLodGroup_EXPORT float GetLodPosition( int index );

protected:
    /* See base class */
    virtual GLSGEN_GlsLodGroup_EXPORT void SetValue( int spec, va_list& args );

#ifdef GLES
    /** Set a single attribute from the GLO file.
     * \param data The attribute to set and its associated data.
     */
    virtual GLSGEN_GlsLodGroup_EXPORT void SetFromGloData( GlsGloFileAttribute& data );
#endif
    //////////////////////////////////////////////////
    // GlsLodGroup specific operations
    //////////////////////////////////////////////////

private:
    // Disable implicit generated Members
    GlsLodGroup& operator=( const GlsLodGroup& rhs );
    GlsLodGroup( const GlsLodGroup& src );

    DynamicArray<float> _lodPositions;
    float               _distanceRange;
    int                 _currentState;
    int                 _previewState;
    float               _previewValue;
};

} // namespace disti

#endif