61 lines
1.8 KiB
C++
61 lines
1.8 KiB
C++
/*
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* Copyright (C) 2018 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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#ifndef TNT_FILAMENT_SAMPLE_ICOSPHERE_H
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#define TNT_FILAMENT_SAMPLE_ICOSPHERE_H
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#include <utils/Entity.h>
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#include <math/vec3.h>
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#include <algorithm>
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#include <map>
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#include <utility>
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#include <vector>
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class IcoSphere {
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public:
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using Index = uint16_t;
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struct Triangle {
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Index vertex[3];
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};
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using TriangleList = std::vector<Triangle>;
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using VertexList = std::vector<filament::math::float3>;
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using IndexedMesh = std::pair<VertexList, TriangleList>;
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explicit IcoSphere(size_t subdivisions);
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IndexedMesh const& getMesh() const { return mMesh; }
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VertexList const& getVertices() const { return mMesh.first; }
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TriangleList const& getIndices() const { return mMesh.second; }
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private:
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static const IcoSphere::VertexList sVertices;
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static const IcoSphere::TriangleList sTriangles;
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using Lookup = std::map<std::pair<Index, Index>, Index>;
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Index vertex_for_edge(Lookup& lookup, VertexList& vertices, Index first, Index second);
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TriangleList subdivide(VertexList& vertices, TriangleList const& triangles);
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IndexedMesh make_icosphere(int subdivisions);
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IndexedMesh mMesh;
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};
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#endif //TNT_FILAMENT_SAMPLE_ICOSPHERE_H
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