💿🐜 Antkeeper source code
https://antkeeper.com
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129 lines
3.5 KiB
129 lines
3.5 KiB
/*
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* Copyright (C) 2021 Christopher J. Howard
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*
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* This file is part of Antkeeper source code.
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*
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* Antkeeper source code is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Antkeeper source code is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef ANTKEEPER_SUBTERRAIN_SYSTEM_HPP
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#define ANTKEEPER_SUBTERRAIN_SYSTEM_HPP
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#include "entity-system.hpp"
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#include "geometry/mesh.hpp"
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#include "geometry/aabb.hpp"
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#include "utility/fundamental-types.hpp"
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#include <unordered_map>
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class resource_manager;
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class model;
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class model_group;
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class material;
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struct cube_tree;
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class scene;
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class model_instance;
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template <std::int64_t Mantissa, std::int64_t Exponent>
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struct epsilon
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{
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static const double value;
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};
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template <std::int64_t Mantissa, std::int64_t Exponent>
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const double epsilon<Mantissa, Exponent>::value = static_cast<double>(Mantissa) * std::pow(10.0, Exponent);
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typedef epsilon<1, -5> epsilon_1en5;
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template <class Epsilon, class T, std::size_t N>
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struct vector_hasher
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{
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typedef math::vector<T, N> vector_type;
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std::size_t operator()(const vector_type& v) const noexcept
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{
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static const T inverse_epsilon = T(1) / Epsilon::value;
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std::size_t hash = 0;
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for (std::size_t i = 0; i < N; ++i)
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{
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std::int64_t j = static_cast<std::int64_t>(v[i] * inverse_epsilon);
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hash ^= std::hash<std::int64_t>()(j) + 0x9e3779b9 + (hash << 6) + (hash >> 2);
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}
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return hash;
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}
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};
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template <class Epsilon, class T, std::size_t N>
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struct vector_equals
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{
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typedef math::vector<T, N> vector_type;
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bool operator()(const vector_type& a, const vector_type& b) const noexcept
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{
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for (std::size_t i = 0; i < N; ++i)
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{
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if (std::fabs(b[i] - a[i]) >= Epsilon::value)
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return false;
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}
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return true;
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}
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};
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class subterrain_system: public entity_system
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{
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public:
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subterrain_system(entt::registry& registry, ::resource_manager* resource_manager);
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~subterrain_system();
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virtual void update(double t, double dt);
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void set_scene(::scene* scene);
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private:
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void regenerate_subterrain_mesh();
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void march(::cube_tree* node);
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void regenerate_subterrain_model();
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void dig(const float3&position, float radius);
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float distance(const ::cube_tree& node, const float3& sample) const;
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resource_manager* resource_manager;
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mesh* subterrain_mesh;
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model* subterrain_model;
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material* subterrain_inside_material;
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material* subterrain_outside_material;
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model_group* subterrain_inside_group;
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model_group* subterrain_outside_group;
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int subterrain_model_vertex_size;
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int subterrain_model_vertex_stride;
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aabb<float> subterrain_bounds;
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::cube_tree* cube_tree;
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std::vector<float3> subterrain_vertices;
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std::vector<std::array<std::uint_fast32_t, 3>> subterrain_triangles;
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float isosurface_resolution;
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bool first_run;
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int merged;
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std::unordered_map<
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float3,
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std::uint_fast32_t,
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vector_hasher<epsilon_1en5, float, 3>,
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vector_equals<epsilon_1en5, float, 3>> subterrain_vertex_map;
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::scene* scene;
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model_instance* subterrain_model_instance;
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};
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#endif // ANTKEEPER_SUBTERRAIN_SYSTEM_HPP
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