sphere.h

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/* Copyright (c) 2008-2022 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