twisted_torus.hpp

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#pragma once
#ifndef OGLPLUS_SHAPES_TWISTED_TORUS_1201021336_HPP
#define OGLPLUS_SHAPES_TWISTED_TORUS_1201021336_HPP

#include <oglplus/shapes/draw.hpp>
#include <oglplus/face_mode.hpp>

#include <oglplus/shapes/vert_attr_info.hpp>

#include <oglplus/math/constants.hpp>
#include <oglplus/math/sphere.hpp>

namespace oglplus {
namespace shapes {

class TwistedTorus
 : public DrawingInstructionWriter
 , public DrawMode
{
private:
    const GLdouble _radius_out, _radius_in, _thickness;
    const GLdouble _r_slip_coef, _s_slip_coef;
    const unsigned _sections, _rings, _twist;
public:
    TwistedTorus(void)
     : _radius_out(1.0)
     , _radius_in(0.5)
     , _thickness(0.02)
     , _r_slip_coef(0.25)
     , _s_slip_coef(0.20)
     , _sections(12)
     , _rings(48)
     , _twist(12)
    { }

    TwistedTorus(
        GLdouble rad_out,
        GLdouble rad_in,
        GLdouble thickness,
        unsigned sects,
        unsigned rings,
        unsigned twist
    ): _radius_out(rad_out)
     , _radius_in(rad_in)
     , _thickness(thickness)
     , _r_slip_coef(0.25)
     , _s_slip_coef(0.20)
     , _sections(sects)
     , _rings(rings)
     , _twist(twist)
    {
        assert(_sections % 2 == 0);
        assert(_rings % 2 == 0);
        assert(_thickness > 0.0);
        assert(_thickness < _radius_in);
        assert(_radius_in < _radius_out);
    }

    FaceOrientation FaceWinding(void) const
    {
        return FaceOrientation::CW;
    }

    std::vector<GLfloat> _positions(void) const;

    GLuint Positions(std::vector<GLfloat>& dest) const
    {
        dest = _positions();
        return 3;
    }

    template <typename T>
    GLuint Positions(std::vector<T>& dest) const
    {
        auto v = _positions();
        dest.assign(v.begin(), v.end());
        return 3;
    }

    std::vector<GLfloat> _normals(void) const;

    GLuint Normals(std::vector<GLfloat>& dest) const
    {
        dest = _normals();
        return 3;
    }

    template <typename T>
    GLuint Normals(std::vector<T>& dest) const
    {
        auto v = _normals();
        dest.assign(v.begin(), v.end());
        return 3;
    }

    std::vector<GLfloat> _tangents(void) const;

    GLuint Tangents(std::vector<GLfloat>& dest) const
    {
        dest = _tangents();
        return 3;
    }

    template <typename T>
    GLuint Tangents(std::vector<T>& dest) const
    {
        auto v = _tangents();
        dest.assign(v.begin(), v.end());
        return 3;
    }

    std::vector<GLfloat> _bitangents(void) const;

    GLuint Bitangents(std::vector<GLfloat>& dest) const
    {
        dest = _bitangents();
        return 3;
    }

    template <typename T>
    GLuint Bitangents(std::vector<T>& dest) const
    {
        auto v = _bitangents();
        dest.assign(v.begin(), v.end());
        return 3;
    }

    std::vector<GLfloat> _tex_coords(void) const;

    GLuint TexCoordinates(std::vector<GLfloat>& dest) const
    {
        dest = _tex_coords();
        return 2;
    }

    template <typename T>
    GLuint TexCoordinates(std::vector<T>& dest) const
    {
        auto v = _tex_coords();
        dest.assign(v.begin(), v.end());
        return 2;
    }

#if OGLPLUS_DOCUMENTATION_ONLY

    typedef VertexAttribsInfo<TwistedTorus> VertexAttribs;
#else
    typedef VertexAttribsInfo<
        TwistedTorus,
        std::tuple<
            VertexPositionsTag,
            VertexNormalsTag,
            VertexTangentsTag,
            VertexBitangentsTag,
            VertexTexCoordinatesTag
        >
    > VertexAttribs;
#endif

    template <typename T>
    void BoundingSphere(oglplus::Sphere<T>& bounding_sphere) const
    {
        bounding_sphere = oglplus::Sphere<T>(
            T(0),
            T(0),
            T(0),
            T(_radius_out + _thickness)
        );
    }

    typedef std::vector<GLuint> IndexArray;

    IndexArray Indices(Default = Default()) const
    {
        return IndexArray();
    }

    DrawingInstructions Instructions(Default = Default()) const;
};

} // shapes
} // oglplus

#if !OGLPLUS_LINK_LIBRARY || defined(OGLPLUS_IMPLEMENTING_LIBRARY)
#include <oglplus/shapes/twisted_torus.ipp>
#endif // OGLPLUS_LINK_LIBRARY

#endif // include guard