/*
 * This program source code file is part of KiCad, a free EDA CAD application.
 *
 * Copyright (C) 2015 Mario Luzeiro <mrluzeiro@ua.pt>
 * Copyright (C) 1992-2015 KiCad Developers, see AUTHORS.txt for contributors.
 *
 * 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, you may find one here:
 * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
 * or you may search the http://www.gnu.org website for the version 2 license,
 * or you may write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
 */

/**
 * @file  clayer_triangles.h
 * @brief
 */

#ifndef CLAYER_TRIANGLES_H_
#define CLAYER_TRIANGLES_H_

#include "common_ogl/openGL_includes.h"
#include "3d_xv3d/xv3d_types.h"
#include <vector>


typedef std::vector< SFVEC3F > SFVEC3F_VECTOR;


/**
 * @brief The CLAYER_TRIANGLE_CONTAINER class stores an manage vector of triangles
 */
class CLAYER_TRIANGLE_CONTAINER
{

public:

    /**
     * @brief CLAYER_TRIANGLE_CONTAINER
     * @param aNrReservedTriangles: number of triangles expected to be used
     * @param aReserveNormals: if you will use normals, set it to bool to pre reserve space
     */
    CLAYER_TRIANGLE_CONTAINER( unsigned int aNrReservedTriangles, bool aReserveNormals );

    /**
     * @brief AddTriangle
     * @param aV1
     * @param aV2
     * @param aV3
     */
    void AddTriangle( const SFVEC3F &aV1, const SFVEC3F &aV2, const SFVEC3F &aV3 );

    /**
     * @brief AddQuad
     * @param aV1
     * @param aV2
     * @param aV3
     * @param aV4
     */
    void AddQuad( const SFVEC3F &aV1, const SFVEC3F &aV2, const SFVEC3F &aV3, const SFVEC3F &aV4 );

    /**
     * @brief AddNormal
     * @param aN1
     * @param aN2
     * @param aN3
     */
    void AddNormal( const SFVEC3F &aN1, const SFVEC3F &aN2, const SFVEC3F &aN3 );

    /**
     * @brief AddNormal
     * @param aN1
     * @param aN2
     * @param aN3
     */
    void AddNormal( const SFVEC3F &aN1, const SFVEC3F &aN2, const SFVEC3F &aN3, const SFVEC3F &aN4 );

    /**
     * @brief GetVertexPointer - Get the array of vertexes
     * @return The pointer to the start of array vertex
     */
    const float *GetVertexPointer() const { return (const float *)&m_vertexs[0].x; }

    /**
     * @brief GetNormalsPointer - Get the array of normals
     * @return The pointer to start of array of normals
     */
    const float *GetNormalsPointer() const { return (const float *)&m_normals[0].x; }

    /**
     * @brief GetVertexSize
     * @return
     */
    unsigned int GetVertexSize() const { return m_vertexs.size(); }

    /**
     * @brief GetNormalsSize
     * @return
     */
    unsigned int GetNormalsSize() const { return m_normals.size(); }

private:
    SFVEC3F_VECTOR m_vertexs;                                                   ///< vertex array
    SFVEC3F_VECTOR m_normals;                                                   ///< normals array
};


/**
 * @brief The CLAYER_TRIANGLES class stores arrays of triangles to be used to
 * create display lists
 */
class CLAYER_TRIANGLES
{
public:
    /**
     * @brief CLAYER_TRIANGLES - initialize arrays with reserved triangles
     * @param aNrReservedTriangles: number of pre alloc triangles to reserve
     */
    CLAYER_TRIANGLES( unsigned int aNrReservedTriangles );

    /**
     * @brief ~CLAYER_TRIANGLES - Free containers
     */
    ~CLAYER_TRIANGLES();

    /**
     * @brief IsLayersSizeValid - check if the vertex arrays of the layers are as expected
     * @return TRUE if layers are correctly setup
     */
    bool IsLayersSizeValid();

    CLAYER_TRIANGLE_CONTAINER *m_layer_top_segment_ends;
    CLAYER_TRIANGLE_CONTAINER *m_layer_top_triangles;
    CLAYER_TRIANGLE_CONTAINER *m_layer_middle_contourns_quads;
    CLAYER_TRIANGLE_CONTAINER *m_layer_bot_triangles;
    CLAYER_TRIANGLE_CONTAINER *m_layer_bot_segment_ends;
};


/**
 * @brief The CLAYERS_OGL_DISP_LISTS class stores the openGL display lists to
 * related with a layer
 */
class CLAYERS_OGL_DISP_LISTS
{
public:
    /**
     * @brief CLAYERS_OGL_DISP_LISTS - Creates the display lists for a layer
     * @param aLayerTriangles: contains the layers array of vertex to render to display lists
     * @param aTextureIndexForSegEnds: texture index to be used by segment ends. It is a black and white squared texture with a center circle diameter of the size of the texture.
     */
    CLAYERS_OGL_DISP_LISTS( const CLAYER_TRIANGLES &aLayerTriangles,
                            GLuint aTextureIndexForSegEnds,
                            const SFVEC3F& aLayerColor );

    /**
     * @brief ~CLAYERS_OGL_DISP_LISTS - Destroy this class while free the display lists from GPU mem
     */
    ~CLAYERS_OGL_DISP_LISTS();

    /**
     * @brief DrawTopAndMiddle - This function calls the display lists for the top elements and middle contourns
     */
    void DrawTopAndMiddle() const;

    /**
     * @brief DrawBotAndMiddle - This function calls the display lists for the botton elements and middle contourns
     */
    void DrawBotAndMiddle() const;

    /**
     * @brief DrawTop - This function calls the display lists for the top elements
     */
    void DrawTop() const;

    /**
     * @brief DrawBot - This function calls the display lists for the botton elements
     */
    void DrawBot() const;

    /**
     * @brief DrawMiddle - This function calls the display lists for the middle elements
     */
    void DrawMiddle() const;

    /**
     * @brief DrawAll - This function calls all the display lists
     */
    void DrawAll() const;

private:
    GLuint generate_top_or_bot_seg_ends(const CLAYER_TRIANGLE_CONTAINER * aTriangleContainer, const SFVEC3F& aLayerColor, bool aIsNormalUp , GLuint aTextureId ) const;
    GLuint generate_top_or_bot_triangles( const CLAYER_TRIANGLE_CONTAINER * aTriangleContainer, const SFVEC3F& aLayerColor, bool aIsNormalUp ) const;
    GLuint generate_middle_triangles( const CLAYER_TRIANGLE_CONTAINER * aTriangleContainer, const SFVEC3F& aLayerColor ) const;

private:
    GLuint m_layer_top_segment_ends;
    GLuint m_layer_top_triangles;
    GLuint m_layer_middle_contourns_quads;
    GLuint m_layer_bot_triangles;
    GLuint m_layer_bot_segment_ends;
};

#endif // CLAYER_TRIANGLES_H_