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70 lines
1.6 KiB
C++
70 lines
1.6 KiB
C++
/*
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* \brief Cube 3D object
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* \author Norman Feske
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* \date 2015-06-19
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*/
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/*
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* Copyright (C) 2015-2017 Genode Labs GmbH
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*
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* This file is part of the Genode OS framework, which is distributed
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* under the terms of the GNU Affero General Public License version 3.
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*/
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#ifndef _INCLUDE__NANO3D__CUBE_SHAPE_H_
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#define _INCLUDE__NANO3D__CUBE_SHAPE_H_
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#include <nano3d/vertex_array.h>
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namespace Nano3d { class Cube_shape; }
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class Nano3d::Cube_shape
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{
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private:
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enum { NUM_VERTICES = 8, NUM_FACES = 6 };
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using Vertex_array = Nano3d::Vertex_array<NUM_VERTICES>;
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Vertex_array _vertices { };
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enum { VERTICES_PER_FACE = 4 };
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using Face = unsigned[VERTICES_PER_FACE];
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Face _faces[NUM_FACES] { { 0, 1, 3, 2 },
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{ 6, 7, 5, 4 },
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{ 1, 0, 4, 5 },
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{ 3, 1, 5, 7 },
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{ 2, 3, 7, 6 },
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{ 0, 2, 6, 4 } };
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public:
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Cube_shape(int size)
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{
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for (unsigned i = 0; i < NUM_VERTICES; i++)
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_vertices[i] = Nano3d::Vertex((i&1) ? size : -size,
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(i&2) ? size : -size,
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(i&4) ? size : -size);
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}
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Vertex_array const &vertex_array() const { return _vertices; }
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/**
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* Call functor 'fn' for each face of the object
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*
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* The functor is called with an array of 'unsigned' vertex indices
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* and the number of indices as arguments.
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*/
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template <typename FN>
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void for_each_face(FN const &fn) const
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{
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for (unsigned i = 0; i < NUM_FACES; i++)
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fn(_faces[i], VERTICES_PER_FACE);
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}
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};
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#endif /* _INCLUDE__NANO3D__CUBE_SHAPE_H_ */
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