💿🐜 Antkeeper source code
https://antkeeper.com
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80 lines
3.0 KiB
80 lines
3.0 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 "ecs/systems/atmosphere-system.hpp"
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#include "physics/atmosphere.hpp"
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namespace ecs {
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atmosphere_system::atmosphere_system(ecs::registry& registry):
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entity_system(registry)
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{
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// RGB wavelengths determined by matching wavelengths to XYZ, transforming XYZ to ACEScg, then selecting the max wavelengths for R, G, and B.
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rgb_wavelengths_nm = {602.224, 541.069, 448.143};
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rgb_wavelengths_m = rgb_wavelengths_nm * 1e-9;
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registry.on_construct<ecs::atmosphere_component>().connect<&atmosphere_system::on_atmosphere_construct>(this);
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registry.on_replace<ecs::atmosphere_component>().connect<&atmosphere_system::on_atmosphere_replace>(this);
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}
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void atmosphere_system::update(double t, double dt)
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{}
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void atmosphere_system::update_coefficients(ecs::entity entity)
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{
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// Abort if entity has no atmosphere component
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if (!registry.has<atmosphere_component>(entity))
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return;
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// Get atmosphere component of the entity
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atmosphere_component& atmosphere = registry.get<atmosphere_component>(entity);
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// Calculate polarization factors
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const double rayleigh_polarization = physics::atmosphere::polarization(atmosphere.index_of_refraction, atmosphere.rayleigh_density);
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const double mie_polarization = physics::atmosphere::polarization(atmosphere.index_of_refraction, atmosphere.mie_density);
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// Calculate Rayleigh scattering coefficients
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atmosphere.rayleigh_scattering =
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{
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physics::atmosphere::scattering_rayleigh(rgb_wavelengths_m.x, atmosphere.rayleigh_density, rayleigh_polarization),
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physics::atmosphere::scattering_rayleigh(rgb_wavelengths_m.y, atmosphere.rayleigh_density, rayleigh_polarization),
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physics::atmosphere::scattering_rayleigh(rgb_wavelengths_m.z, atmosphere.rayleigh_density, rayleigh_polarization)
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};
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// Calculate Mie scattering coefficients
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const double mie_scattering = physics::atmosphere::scattering_mie(atmosphere.mie_density, mie_polarization);
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atmosphere.mie_scattering =
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{
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mie_scattering,
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mie_scattering,
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mie_scattering
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};
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}
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void atmosphere_system::on_atmosphere_construct(ecs::registry& registry, ecs::entity entity, ecs::atmosphere_component& atmosphere)
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{
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update_coefficients(entity);
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}
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void atmosphere_system::on_atmosphere_replace(ecs::registry& registry, ecs::entity entity, ecs::atmosphere_component& atmosphere)
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{
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update_coefficients(entity);
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}
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} // namespace ecs
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