glpolygon.h

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/*! \file
  \brief  The disti::GLPolygon class.  Implements Polygons.

  \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 _GLPOLYGON_H
#define _GLPOLYGON_H

#include "gls_include.h"
#ifdef GLES
#    include "gls_vertex_array.h"
#endif
#include "display.h"
#include "gls_cpp_lang_support.h"

namespace disti
{
/**
  \brief  The Polygon class.  Implements Polygons
*/
class GLPolygon : public DisplayObject
{
private:
    /** Assignment operator not implemented. Use CloneObject() or the copy constructor instead. */
    GLPolygon& operator=( const GLPolygon& that ) DISTI_SPECIAL_MEM_FUN_DELETE;
    GLPolygon( const GLPolygon& that ) DISTI_SPECIAL_MEM_FUN_DELETE;

public:
    typedef DisplayObject _BaseClass;
    friend class GLPolygonEditor;

    static GLS_EXPORT DisplayObject* CreateInstance();

    /** Creates a polygon with the vertices specified
      * \param nPoints   The number of vertices in the new polygon
      * \param vertices  The array of vertices for the polygon
      */
    GLS_EXPORT GLPolygon( unsigned int nPoints, const Vertex* vertices );

    /** Creates a polygon with the vertices specified
      * \param nPoints   The number of vertices in the new polygon
      * \param vertices  The array of vertices for the polygon
      * \param location  The location point of the object
      */
    GLS_EXPORT GLPolygon( unsigned int nPoints, const Vertex* vertices, const Vertex& location );

    /** Allocate a (blank) polygon object */
    GLS_EXPORT GLPolygon( void );

    /** Copy construct a new GLPolygon object
      * \param polygon          The polygon to be cloned
      * \param generateNames    Whether or not to generate a new instance name
      */
    GLS_EXPORT GLPolygon( const GLPolygon& polygon, const bool generateNames );

    /** Destroy a polygon object */
    virtual GLS_EXPORT ~GLPolygon( void );

    /** Configures MetaData */
    GLS_EXPORT void ConfigureMetaData( void );

    /* Copy+Create operation in one method. In derived classes, this
      * method will create a new instance of the derived class and then
      * copy the object into the new instance. The cut,copy,paste and undo
      * operations use this method.
      * \param generateNames  Whether or not to generate new names for cloned objects
      * \return A new object, identical to the original, except for the instance name
      */
    virtual GLS_EXPORT DisplayObject* CloneObject( bool generateNames = false );

#ifdef GLES
    virtual GLS_EXPORT void PreDraw( const OpenGLMatrices& current, Culler& culler );
#endif

    /** Draws this object on the current display frame (_parent member). */
    virtual GLS_EXPORT void Draw( void );

    /** Recalculates the texture coordinates for the object based on the TexturePoints.
      */
    virtual GLS_EXPORT void CalculateTextureCoordinates( void );

    /** Calculates normals based on the vertices and the specified winding order */
    virtual GLS_EXPORT void CalcNormals( int windingOrder = 1 );

#ifdef GLES
    /** Sets the RGBA color for filling the object
      * \param r  The new Red fill color (0-255 range) for the object
      * \param g  The new Green fill color (0-255 range) for the object
      * \param b  The new Blue fill color (0-255 range) for the object
      * \param a  The new Alpha fill color (0-255 range) for the object
      */
    virtual GLS_EXPORT void SetFillColor( unsigned char r, unsigned char g, unsigned char b, unsigned char a );

    /** Sets the RGBA color for filling the object
      * \param color  The new RGBA fill color (0-255 range) for the object
      */
    virtual GLS_EXPORT void SetFillColor( const GlsColor& color );
#endif

    /* Unhides base class implementation. */

    using _BaseClass::DeleteVertex;

    /** DeleteVertex is overloaded in polygon to prevent having a poly with less than 2 verts. This
      * prevents incorrect GL calls when polygon is set to POLY_MODE_FILLED
      */
    virtual GLS_EXPORT void DeleteVertex( unsigned int index );

    virtual GLS_EXPORT DisplayObject* Pick3D( const Vector& winLoc,
        const Vector&                                       logicalCoords,
        float                                               scale,
        const Vector&                                       directionVector,
        Vector&                                             collisionWinLoc, /*Returned*/
        const OpenGLMatrices&                               parentDrawn );

#ifdef GLES
protected:
    void DrawSolidGeometry( bool textureObject, bool color, bool normal );
    void DrawOutlineGeometry();
    void DrawPoints();
    void BakeVBO( bool hasT, bool hasC, bool hasN );

    GlsVertexArray _vertArray;
    bool           _pendingFillColor;
#endif
};

} // namespace disti

#endif