💿🐜 Antkeeper source code
https://antkeeper.com
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133 lines
5.1 KiB
133 lines
5.1 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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#include "entity/systems/atmosphere.hpp"
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#include "physics/gas/atmosphere.hpp"
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#include "physics/gas/ozone.hpp"
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#include "physics/number-density.hpp"
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namespace entity {
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namespace system {
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atmosphere::atmosphere(entity::registry& registry):
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updatable(registry),
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rgb_wavelengths{0, 0, 0},
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rgb_ozone_cross_sections{0, 0, 0},
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atmosphere_component(nullptr),
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sky_pass(nullptr)
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{
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registry.on_construct<entity::component::atmosphere>().connect<&atmosphere::on_atmosphere_construct>(this);
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registry.on_replace<entity::component::atmosphere>().connect<&atmosphere::on_atmosphere_replace>(this);
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registry.on_destroy<entity::component::atmosphere>().connect<&atmosphere::on_atmosphere_destroy>(this);
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}
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void atmosphere::update(double t, double dt)
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{}
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void atmosphere::set_rgb_wavelengths(const double3& wavelengths)
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{
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rgb_wavelengths = wavelengths;
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// Update ozone cross sections
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rgb_ozone_cross_sections =
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{
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physics::gas::ozone::cross_section_293k<double>(wavelengths.x * 1e9),
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physics::gas::ozone::cross_section_293k<double>(wavelengths.y * 1e9),
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physics::gas::ozone::cross_section_293k<double>(wavelengths.z * 1e9)
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};
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atmosphere_modified();
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}
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void atmosphere::set_sky_pass(::render::sky_pass* pass)
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{
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sky_pass = pass;
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update_sky_pass();
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}
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void atmosphere::atmosphere_modified()
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{
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if (!atmosphere_component)
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return;
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// Get atmosphere component of the entity
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entity::component::atmosphere& component = *atmosphere_component;
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// Calculate Rayleigh scattering coefficients
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const double rayleigh_density = physics::number_density(component.rayleigh_concentration);
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const double rayleigh_polarization = physics::gas::atmosphere::polarization(component.index_of_refraction, rayleigh_density);
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component.rayleigh_scattering =
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{
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physics::gas::atmosphere::scattering(rayleigh_density, rayleigh_polarization, rgb_wavelengths.x),
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physics::gas::atmosphere::scattering(rayleigh_density, rayleigh_polarization, rgb_wavelengths.y),
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physics::gas::atmosphere::scattering(rayleigh_density, rayleigh_polarization, rgb_wavelengths.z)
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};
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// Calculate Mie scattering and extinction coefficients
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const double mie_density = physics::number_density(component.mie_concentration);
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const double mie_polarization = physics::gas::atmosphere::polarization(component.index_of_refraction, mie_density);
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component.mie_scattering = physics::gas::atmosphere::scattering(mie_density, mie_polarization);
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component.mie_extinction = physics::gas::atmosphere::extinction(component.mie_scattering, component.mie_albedo);
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// Calculate ozone absorption coefficients
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const double ozone_density = physics::number_density(component.ozone_concentration);
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component.ozone_absorption =
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{
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physics::gas::ozone::absorption(rgb_ozone_cross_sections.x, ozone_density),
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physics::gas::ozone::absorption(rgb_ozone_cross_sections.y, ozone_density),
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physics::gas::ozone::absorption(rgb_ozone_cross_sections.z, ozone_density)
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};
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// Pass atmosphere parameters to sky pass
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update_sky_pass();
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}
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void atmosphere::update_sky_pass()
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{
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if (!sky_pass || !atmosphere_component)
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return;
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const entity::component::atmosphere& component = *atmosphere_component;
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sky_pass->set_atmosphere_upper_limit(static_cast<float>(component.upper_limit));
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sky_pass->set_rayleigh_parameters(static_cast<float>(component.rayleigh_scale_height), math::type_cast<float>(component.rayleigh_scattering));
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sky_pass->set_mie_parameters(static_cast<float>(component.mie_scale_height), static_cast<float>(component.mie_scattering), static_cast<float>(component.mie_extinction), static_cast<float>(component.mie_anisotropy));
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sky_pass->set_ozone_parameters(static_cast<float>(component.ozone_lower_limit), static_cast<float>(component.ozone_upper_limit), static_cast<float>(component.ozone_mode), math::type_cast<float>(component.ozone_absorption));
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sky_pass->set_airglow_illuminance(math::type_cast<float>(component.airglow_illuminance));
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}
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void atmosphere::on_atmosphere_construct(entity::registry& registry, entity::id entity_id, entity::component::atmosphere& component)
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{
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atmosphere_component = &component;
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atmosphere_modified();
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}
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void atmosphere::on_atmosphere_replace(entity::registry& registry, entity::id entity_id, entity::component::atmosphere& component)
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{
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atmosphere_component = &component;
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atmosphere_modified();
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}
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void atmosphere::on_atmosphere_destroy(entity::registry& registry, entity::id entity_id)
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{
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atmosphere_component = nullptr;
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}
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} // namespace system
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} // namespace entity
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