/* Copyright (c) 2008-2021 the MRtrix3 contributors.
 *
 * This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/.
 *
 * Covered Software is provided under this License on an "as is"
 * basis, without warranty of any kind, either expressed, implied, or
 * statutory, including, without limitation, warranties that the
 * Covered Software is free of defects, merchantable, fit for a
 * particular purpose or non-infringing.
 * See the Mozilla Public License v. 2.0 for more details.
 *
 * For more details, see http://www.mrtrix.org/.
 */

#ifndef __gui_shapes_sphere_h__
#define __gui_shapes_sphere_h__

#include "types.h"

#include "gui/opengl/gl.h"
#include "gui/opengl/gl_core_3_3.h"

namespace MR
{
  namespace GUI
  {
    namespace Shapes
    {


    class Sphere
    { MEMALIGN(Sphere)
      public:
        // TODO Initialise sphere & buffers at construction;
        //   currently it doesn't seem to work as a GL context has not yet been
        //   created, so gl::GenBuffers() returns zero
        Sphere () : num_indices (0) { }

        void LOD (const size_t);

        size_t num_indices;
        GL::VertexBuffer vertex_buffer;
        GL::IndexBuffer index_buffer;


        class Vertex { NOMEMALIGN
          public:
            Vertex () { }
            Vertex (const float x[3]) { p[0] = x[0]; p[1] = x[1]; p[2] = x[2]; }
            template <class Container>
              Vertex (const Container& vertices, size_t i1, size_t i2) {
                p[0] = vertices[i1][0] + vertices[i2][0];
                p[1] = vertices[i1][1] + vertices[i2][1];
                p[2] = vertices[i1][2] + vertices[i2][2];
                Eigen::Map<Eigen::Vector3f> (p).normalize();
              }

            float& operator[] (const int n) { return p[n]; }
            float operator[] (const int n) const { return p[n]; }

          private:
            float p[3];

        };

        vector<Vertex> vertices;

    };


    }
  }
}

#endif

