💿🐜 Antkeeper source code
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164 lines
5.3 KiB
164 lines
5.3 KiB
/*
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* Copyright (C) 2023 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_GAME_ASTRONOMY_SYSTEM_HPP
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#define ANTKEEPER_GAME_ASTRONOMY_SYSTEM_HPP
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#include "game/systems/updatable-system.hpp"
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#include <engine/entity/id.hpp>
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#include <engine/scene/directional-light.hpp>
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#include <engine/utility/fundamental-types.hpp>
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#include <engine/math/se3.hpp>
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#include <engine/render/passes/sky-pass.hpp>
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#include "game/components/observer-component.hpp"
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#include "game/components/atmosphere-component.hpp"
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#include "game/components/celestial-body-component.hpp"
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#include "game/components/orbit-component.hpp"
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#include <engine/geom/primitives/ray.hpp>
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/**
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* Calculates apparent properties of celestial bodies as seen by an observer.
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*/
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class astronomy_system:
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public updatable_system
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{
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public:
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explicit astronomy_system(entity::registry& registry);
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~astronomy_system();
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/**
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* Adds the timestep `dt`, scaled by set time scale, to the current time, then calculates apparent properties of celestial bodies as seen by an observer.
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*
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* @param t Time, in seconds.
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* @param dt Delta time, in seconds.
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*/
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virtual void update(float t, float dt);
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/**
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* Sets the current time.
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*
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* @param t Time since epoch, in days.
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*/
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void set_time(double t);
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/**
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* Sets the factor by which the timestep `dt` will be scaled before being added to the current time.
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*
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* @param scale Factor by which to scale the timestep.
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*/
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void set_time_scale(double scale);
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/**
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* Sets the observer entity.
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*
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* @param eid Entity ID of the observer.
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*/
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void set_observer(entity::id eid);
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/**
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* Sets the number of samples to take when integrating atmospheric transmittance.
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*
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* @param samples Number of integration samples.
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*/
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void set_transmittance_samples(std::size_t samples);
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void set_sun_light(scene::directional_light* light);
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void set_moon_light(scene::directional_light* light);
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void set_starlight_illuminance(const double3& illuminance);
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void set_sky_pass(::render::sky_pass* pass);
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[[nodiscard]] inline double get_time() const noexcept
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{
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return time_days;
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}
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private:
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void on_observer_modified(entity::registry& registry, entity::id entity_id);
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void on_observer_destroyed(entity::registry& registry, entity::id entity_id);
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void on_celestial_body_modified(entity::registry& registry, entity::id entity_id);
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void on_celestial_body_destroyed(entity::registry& registry, entity::id entity_id);
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void on_orbit_modified(entity::registry& registry, entity::id entity_id);
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void on_orbit_destroyed(entity::registry& registry, entity::id entity_id);
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void on_atmosphere_modified(entity::registry& registry, entity::id entity_id);
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void on_atmosphere_destroyed(entity::registry& registry, entity::id entity_id);
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/// Called each time the observer is modified.
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void observer_modified();
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/// Called each time the celestial body of the reference body is modified.
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void reference_body_modified();
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/// Called each time the orbit of the reference body is modified.
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void reference_orbit_modified();
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/// Called each time the atmosphere of the reference body is modified.
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void reference_atmosphere_modified();
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/// Updates the BCBF to EUS transformation.
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void update_bcbf_to_eus(const ::observer_component& observer, const ::celestial_body_component& body);
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/// Updates the ICRF to EUS transformation.
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void update_icrf_to_eus(const ::celestial_body_component& body, const ::orbit_component& orbit);
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/**
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* Integrates a transmittance factor due to atmospheric extinction along a ray.
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*
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* @param ray Ray to cast, in the EUS frame.
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* @param samples Number of samples to integrate.
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*
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* @return Spectral transmittance factor.
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*/
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double3 integrate_transmittance(const ::observer_component& observer, const ::celestial_body_component& body, const ::atmosphere_component& atmosphere, geom::ray<double, 3> ray) const;
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/// Time since epoch, in days.
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double time_days;
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/// Time since epoch, in centuries.
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double time_centuries;
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/// Time scale.
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double time_scale;
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/// Number of transmittance integration samples.
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std::size_t transmittance_samples;
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/// Entity ID of the observer.
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entity::id observer_eid;
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/// Entity ID of the reference body.
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entity::id reference_body_eid;
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/// ENU to EUS transformation.
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math::transformation::se3<double> enu_to_eus;
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/// BCBF to EUS transformation.
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math::transformation::se3<double> bcbf_to_eus;
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/// ICRF to EUS tranformation.
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math::transformation::se3<double> icrf_to_eus;
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scene::directional_light* sun_light;
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scene::directional_light* moon_light;
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::render::sky_pass* sky_pass;
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double3 starlight_illuminance;
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};
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#endif // ANTKEEPER_GAME_ASTRONOMY_SYSTEM_HPP
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