sky_box.hpp

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#pragma once
#ifndef OGLPLUS_SHAPES_SKY_CUBE_1206011111_HPP
#define OGLPLUS_SHAPES_SKY_CUBE_1206011111_HPP

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

#include <oglplus/shapes/vert_attr_info.hpp>

namespace oglplus {
namespace shapes {

class SkyBox
 : public DrawingInstructionWriter
 , public DrawMode
{
private:
public:
    FaceOrientation FaceWinding(void) const
    {
        return FaceOrientation::CW;
    }

    typedef GLuint (SkyBox::*VertexAttribFunc)(std::vector<GLfloat>&) const;

    template <typename T>
    GLuint Positions(std::vector<T>& dest) const
    {
        const T _positions[8*3] = {
            T(-1), T(-1), T(-1),
            T(+1), T(-1), T(-1),
            T(-1), T(+1), T(-1),
            T(+1), T(+1), T(-1),
            T(-1), T(-1), T(+1),
            T(+1), T(-1), T(+1),
            T(-1), T(+1), T(+1),
            T(+1), T(+1), T(+1)
        };
        dest.assign(_positions, _positions+8*3);
        return 3;
    }

#if OGLPLUS_DOCUMENTATION_ONLY

    typedef VertexAttribsInfo<SkyBox> VertexAttribs;
#else
    typedef VertexAttribsInfo<
        SkyBox,
        std::tuple<
            VertexPositionsTag
        >
    > 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(1));
    }

    typedef std::vector<GLushort> IndexArray;

    IndexArray Indices(Default = Default()) const
    {
        const GLushort _indices[6*5] = {
            1, 3, 5, 7, 9,
            4, 6, 0, 2, 9,
            2, 6, 3, 7, 9,
            4, 0, 5, 1, 9,
            5, 7, 4, 6, 9,
            0, 2, 1, 3, 9
        };
        return IndexArray(_indices, _indices+6*5);
    }

    DrawingInstructions Instructions(Default = Default()) const
    {
        DrawOperation operation;
        operation.method = DrawOperation::Method::DrawElements;
        operation.mode = PrimitiveType::TriangleStrip;
        operation.first = 0;
        operation.count = 6*5;
        operation.restart_index = 9;
        operation.phase = 0;

        return this->MakeInstructions(operation);
    }
};

} // shapes
} // oglplus

#endif // include guard