💿🐜 Antkeeper source code
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301 lines
10 KiB
301 lines
10 KiB
/*
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* Copyright (C) 2020 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 "game/systems/weather-system.hpp"
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#include "scene/directional-light.hpp"
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#include "scene/ambient-light.hpp"
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#include "renderer/passes/sky-pass.hpp"
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#include "renderer/passes/shadow-map-pass.hpp"
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#include "renderer/passes/material-pass.hpp"
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#include "utility/gamma.hpp"
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#include "resources/image.hpp"
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#include "game/astronomy/celestial-coordinates.hpp"
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#include "game/astronomy/celestial-mechanics.hpp"
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#include "game/astronomy/celestial-time.hpp"
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#include <cmath>
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#include <iostream>
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static constexpr double hours_per_day = 24.0;
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static constexpr double minutes_per_day = hours_per_day * 60.0;
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static constexpr double seconds_per_day = minutes_per_day * 60.0;
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weather_system::weather_system(entt::registry& registry):
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entity_system(registry),
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ambient_light(nullptr),
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sun_light(nullptr),
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moon_light(nullptr),
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shadow_light(nullptr),
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sky_pass(nullptr),
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shadow_map_pass(nullptr),
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material_pass(nullptr),
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time_scale(1.0f),
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sun_direction{0.0f, -1.0f, 0.0f},
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location{0.0f, 0.0f, 0.0f},
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jd(0.0)
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{}
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void weather_system::update(double t, double dt)
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{
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jd += (dt * time_scale) / seconds_per_day;
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const float latitude = location[0];
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const float longitude = location[1];
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// Calculate local time
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double time_correction = longitude / (math::two_pi<double> / 24.0);
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double local_jd = jd + time_correction / 24.0 - 0.5;
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double local_time = (local_jd - std::floor(local_jd)) * 24.0;
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// Solar distance in AU
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//double sr = ...
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// Apparent radius in degrees
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//double sradius = 0.2666 / sr;
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double lmst = ast::jd_to_lmst(jd, longitude);
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double ecl = ast::approx_ecliptic_obliquity(jd);
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double3x3 ecliptic_to_horizontal = ast::ecliptic_to_horizontal(ecl, latitude, lmst);
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double3 sun_ecliptic = ast::approx_sun_ecliptic(jd);
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double3 sun_horizontal = ecliptic_to_horizontal * sun_ecliptic;
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sun_horizontal.z -= 4.25875e-5; // Subtract one earth radius (in AU), for positon of observer
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double3 sun_spherical = ast::rectangular_to_spherical(sun_horizontal);
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double3 sun_positiond = ast::horizontal_to_right_handed * sun_horizontal;
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float2 sun_az_el = {static_cast<float>(sun_spherical.z) - math::pi<float>, static_cast<float>(sun_spherical.y)};
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float3 sun_position = math::normalize(float3{static_cast<float>(sun_positiond.x), static_cast<float>(sun_positiond.y), static_cast<float>(sun_positiond.z)});
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double3 moon_ecliptic = ast::approx_moon_ecliptic(jd);
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double3 moon_horizontal = ecliptic_to_horizontal * moon_ecliptic;
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moon_horizontal.z -= 1.0; // Subtract one earth radius, for position of observer
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double3 moon_spherical = ast::rectangular_to_spherical(moon_horizontal);
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double3 moon_positiond = ast::horizontal_to_right_handed * moon_horizontal;
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float2 moon_az_el = {static_cast<float>(moon_spherical.z) - math::pi<float>, static_cast<float>(moon_spherical.y)};
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float3 moon_position = math::normalize(math::type_cast<float>(moon_positiond));
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//double3 moon_sphericald = ast::rectangular_to_spherical(moon_positiond);
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//std::cout << "old azel: " << math::degrees(moon_az_el.x) << ", " << math::degrees(moon_az_el.y) << std::endl;
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//std::cout << "new azel: " << math::degrees(moon_sphericald.z) << ", " << math::degrees(moon_sphericald.y) << std::endl;
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double3x3 moon_rotation_matrix = ast::horizontal_to_right_handed * ecliptic_to_horizontal;
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math::quaternion<double> moon_rotationd = math::normalize(math::quaternion_cast(moon_rotation_matrix) * math::angle_axis(math::half_pi<double>, double3{0, 1, 0}) * math::angle_axis(-math::half_pi<double>, double3{0, 0, -1}));
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math::quaternion<float> moon_rotation =
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{
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static_cast<float>(moon_rotationd.w),
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static_cast<float>(moon_rotationd.x),
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static_cast<float>(moon_rotationd.y),
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static_cast<float>(moon_rotationd.z)
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};
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if (sun_light)
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{
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math::quaternion<float> sun_azimuth_rotation = math::angle_axis(sun_az_el[0], float3{0, 1, 0});
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math::quaternion<float> sun_elevation_rotation = math::angle_axis(sun_az_el[1], float3{-1, 0, 0});
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math::quaternion<float> sun_az_el_rotation = math::normalize(sun_azimuth_rotation * sun_elevation_rotation);
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sun_light->set_rotation(sun_az_el_rotation);
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}
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if (moon_light)
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{
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math::quaternion<float> moon_azimuth_rotation = math::angle_axis(moon_az_el[0], float3{0, 1, 0});
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math::quaternion<float> moon_elevation_rotation = math::angle_axis(moon_az_el[1], float3{-1, 0, 0});
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math::quaternion<float> moon_az_el_rotation = math::normalize(moon_azimuth_rotation * moon_elevation_rotation);
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moon_light->set_rotation(moon_az_el_rotation);
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}
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float sun_gradient_position = static_cast<float>(std::max<double>(0.0, ((sun_az_el[1] + math::half_pi<double>) / math::pi<double>)));
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float moon_gradient_position = static_cast<float>(std::max<double>(0.0, ((moon_az_el[1] + math::half_pi<double>) / math::pi<double>)));
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float sky_gradient_position = sun_gradient_position;
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float ambient_gradient_position = sun_gradient_position;
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if (sky_pass)
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{
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float3 horizon_color = interpolate_gradient(horizon_colors, sun_gradient_position);
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float3 zenith_color = interpolate_gradient(zenith_colors, sun_gradient_position);
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float3 sun_color = interpolate_gradient(sun_colors, sun_gradient_position);
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float3 moon_color = interpolate_gradient(moon_colors, moon_gradient_position);
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float3 ambient_color = interpolate_gradient(ambient_colors, ambient_gradient_position);
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sun_light->set_color(sun_color);
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sun_light->set_intensity(1.0f);
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moon_light->set_color(moon_color);
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moon_light->set_intensity(1.0f);
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ambient_light->set_color(ambient_color);
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ambient_light->set_intensity(0.5f);
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sky_pass->set_horizon_color(horizon_color);
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sky_pass->set_zenith_color(zenith_color);
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sky_pass->set_time_of_day(static_cast<float>(local_time * 60.0 * 60.0));
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sky_pass->set_observer_location(location[0], location[1], location[2]);
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sky_pass->set_sun_coordinates(sun_position, sun_az_el);
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sky_pass->set_moon_coordinates(moon_position, moon_az_el);
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sky_pass->set_julian_day(static_cast<float>(jd));
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sky_pass->set_moon_rotation(moon_rotation);
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}
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shadow_light = sun_light;
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if (shadow_map_pass)
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{
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if (sun_az_el[1] < 0.0f)
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{
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shadow_map_pass->set_light(moon_light);
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}
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else
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{
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shadow_map_pass->set_light(sun_light);
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}
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}
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if (material_pass)
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{
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float shadow_strength = interpolate_gradient(shadow_strengths, sun_gradient_position).x;
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material_pass->set_shadow_strength(shadow_strength);
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}
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}
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void weather_system::set_location(float latitude, float longitude, float altitude)
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{
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location = {latitude, longitude, altitude};
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}
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void weather_system::set_ambient_light(::ambient_light* light)
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{
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ambient_light = light;
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}
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void weather_system::set_sun_light(directional_light* light)
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{
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sun_light = light;
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}
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void weather_system::set_moon_light(directional_light* light)
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{
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moon_light = light;
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}
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void weather_system::set_sky_pass(::sky_pass* pass)
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{
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sky_pass = pass;
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if (sky_pass)
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{
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sky_pass->set_moon_angular_radius(math::radians(1.0f));
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sky_pass->set_sun_angular_radius(math::radians(1.1f));
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}
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}
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void weather_system::set_shadow_map_pass(::shadow_map_pass* pass)
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{
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shadow_map_pass = pass;
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if (shadow_map_pass)
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{
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shadow_map_pass->set_light(shadow_light);
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}
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}
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void weather_system::set_material_pass(::material_pass* pass)
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{
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material_pass = pass;
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}
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void weather_system::set_time(int year, int month, int day, int hour, int minute, double second, double tc)
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{
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jd = ast::ut_to_jd(year, month, day, hour, minute, second) - tc / 24.0;
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}
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void weather_system::set_time_scale(float scale)
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{
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time_scale = scale;
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}
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void weather_system::set_sky_palette(const ::image* image)
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{
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load_palette(&horizon_colors, image, 0);
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load_palette(&zenith_colors, image, 1);
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}
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void weather_system::set_sun_palette(const ::image* image)
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{
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load_palette(&sun_colors, image, 0);
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}
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void weather_system::set_moon_palette(const ::image* image)
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{
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load_palette(&moon_colors, image, 0);
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}
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void weather_system::set_ambient_palette(const ::image* image)
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{
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load_palette(&ambient_colors, image, 0);
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}
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void weather_system::set_shadow_palette(const ::image* image)
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{
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load_palette(&shadow_strengths, image, 0);
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}
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void weather_system::load_palette(std::vector<float3>* palette, const ::image* image, unsigned int row)
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{
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unsigned int w = image->get_width();
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unsigned int h = image->get_height();
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unsigned int c = image->get_channels();
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unsigned int y = std::min<unsigned int>(row, h - 1);
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palette->clear();
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if (image->is_hdr())
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{
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const float* pixels = static_cast<const float*>(image->get_pixels());
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for (unsigned int x = 0; x < w; ++x)
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{
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unsigned int i = y * w * c + x * c;
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float r = pixels[i];
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float g = pixels[i + 1];
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float b = pixels[i + 2];
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palette->push_back(float3{r, g, b});
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}
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}
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else
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{
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const unsigned char* pixels = static_cast<const unsigned char*>(image->get_pixels());
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for (unsigned int x = 0; x < w; ++x)
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{
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unsigned int i = y * w * c + x * c;
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float r = srgb_to_linear(static_cast<float>(pixels[i]) / 255.0f);
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float g = srgb_to_linear(static_cast<float>(pixels[i + 1]) / 255.0f);
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float b = srgb_to_linear(static_cast<float>(pixels[i + 2]) / 255.0f);
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palette->push_back(float3{r, g, b});
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}
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}
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}
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float3 weather_system::interpolate_gradient(const std::vector<float3>& gradient, float position)
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{
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position *= static_cast<float>(gradient.size() - 1);
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int index0 = static_cast<int>(position) % gradient.size();
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int index1 = (index0 + 1) % gradient.size();
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return math::lerp<float3>(gradient[index0], gradient[index1], position - std::floor(position));
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}
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