💿🐜 Antkeeper source code
https://antkeeper.com
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479 lines
14 KiB
479 lines
14 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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#include "game/world.hpp"
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#include <engine/color/color.hpp>
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#include <engine/config.hpp>
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#include <engine/debug/log.hpp>
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#include <engine/entity/archetype.hpp>
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#include "game/commands/commands.hpp"
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#include "game/components/atmosphere-component.hpp"
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#include "game/components/blackbody-component.hpp"
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#include "game/components/celestial-body-component.hpp"
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#include "game/components/observer-component.hpp"
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#include "game/components/orbit-component.hpp"
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#include "game/components/terrain-component.hpp"
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#include "game/components/transform-component.hpp"
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#include "game/systems/astronomy-system.hpp"
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#include "game/systems/atmosphere-system.hpp"
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#include "game/systems/orbit-system.hpp"
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#include "game/systems/terrain-system.hpp"
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#include <engine/geom/solid-angle.hpp>
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#include <engine/gl/vertex-array.hpp>
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#include <engine/gl/vertex-buffer.hpp>
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#include <engine/i18n/string-table.hpp>
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#include <engine/math/hash/hash.hpp>
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#include <engine/math/noise/noise.hpp>
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#include <engine/math/angles.hpp>
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#include <engine/physics/light/photometry.hpp>
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#include <engine/physics/light/vmag.hpp>
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#include <engine/physics/orbit/ephemeris.hpp>
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#include <engine/physics/orbit/orbit.hpp>
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#include <engine/physics/time/constants.hpp>
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#include <engine/physics/time/gregorian.hpp>
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#include <engine/physics/time/utc.hpp>
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#include <engine/render/material-flags.hpp>
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#include <engine/render/material.hpp>
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#include <engine/render/model.hpp>
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#include <engine/render/passes/sky-pass.hpp>
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#include <engine/render/vertex-attribute-location.hpp>
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#include <engine/utility/json.hpp>
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#include <engine/resources/resource-manager.hpp>
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#include <engine/scene/directional-light.hpp>
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#include <engine/scene/text.hpp>
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#include <algorithm>
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#include <execution>
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#include <fstream>
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#include <engine/animation/screen-transition.hpp>
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#include <engine/animation/ease.hpp>
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namespace world {
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/// Loads an ephemeris.
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static void load_ephemeris(::game& ctx);
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/// Creates the fixed stars.
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static void create_stars(::game& ctx);
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/// Creates the Sun.
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static void create_sun(::game& ctx);
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/// Creates the Earth-Moon system.
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static void create_earth_moon_system(::game& ctx);
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/// Creates the Earth.
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static void create_earth(::game& ctx);
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/// Creates the Moon.
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static void create_moon(::game& ctx);
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void cosmogenesis(::game& ctx)
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{
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debug::log_trace("Generating cosmos...");
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load_ephemeris(ctx);
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create_stars(ctx);
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create_sun(ctx);
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create_earth_moon_system(ctx);
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debug::log_trace("Generated cosmos");
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}
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void create_observer(::game& ctx)
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{
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debug::log_trace("Creating observer...");
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{
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// Create observer entity
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entity::id observer_eid = ctx.entity_registry->create();
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ctx.entities["observer"] = observer_eid;
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// Construct observer component
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::observer_component observer;
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// Set observer reference body
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if (auto it = ctx.entities.find("earth"); it != ctx.entities.end())
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observer.reference_body_eid = it->second;
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else
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observer.reference_body_eid = entt::null;
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// Set observer location
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observer.elevation = 0.0;
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observer.latitude = 0.0;
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observer.longitude = 0.0;
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// Assign observer component to observer entity
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ctx.entity_registry->emplace<::observer_component>(observer_eid, observer);
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// Set atmosphere system active atmosphere
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ctx.atmosphere_system->set_active_atmosphere(observer.reference_body_eid);
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// Set astronomy system observer
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ctx.astronomy_system->set_observer(observer_eid);
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}
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debug::log_trace("Created observer");
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}
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void set_location(::game& ctx, double elevation, double latitude, double longitude)
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{
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if (auto it = ctx.entities.find("observer"); it != ctx.entities.end())
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{
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entity::id observer_eid = it->second;
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if (ctx.entity_registry->valid(observer_eid) && ctx.entity_registry->all_of<::observer_component>(observer_eid))
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{
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// Update observer location
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ctx.entity_registry->patch<::observer_component>
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(
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observer_eid,
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[&](auto& component)
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{
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component.elevation = elevation;
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component.latitude = latitude;
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component.longitude = longitude;
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}
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);
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}
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}
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}
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void set_time(::game& ctx, double t)
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{
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try
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{
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ctx.astronomy_system->set_time(t);
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ctx.orbit_system->set_time(t);
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// debug::log_info("Set time to UT1 {}", t);
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}
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catch (const std::exception& e)
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{
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debug::log_error("Failed to set time to UT1 {}: {}", t, e.what());
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}
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}
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void set_time(::game& ctx, int year, int month, int day, int hour, int minute, double second)
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{
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double longitude = 0.0;
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// Get longitude of observer
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if (auto it = ctx.entities.find("observer"); it != ctx.entities.end())
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{
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entity::id observer_eid = it->second;
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if (ctx.entity_registry->valid(observer_eid))
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{
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const auto observer = ctx.entity_registry->try_get<::observer_component>(observer_eid);
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if (observer)
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longitude = observer->longitude;
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}
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}
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// Calculate UTC offset at longitude
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const double utc_offset = physics::time::utc::offset<double>(longitude);
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// Convert time from Gregorian to UT1
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const double t = physics::time::gregorian::to_ut1<double>(year, month, day, hour, minute, second, utc_offset);
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set_time(ctx, t);
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}
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void set_time_scale(::game& ctx, double scale)
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{
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// Convert time scale from seconds to days
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const double astronomical_scale = scale / physics::time::seconds_per_day<double>;
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ctx.orbit_system->set_time_scale(astronomical_scale);
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ctx.astronomy_system->set_time_scale(astronomical_scale);
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}
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void load_ephemeris(::game& ctx)
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{
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ctx.orbit_system->set_ephemeris(ctx.resource_manager->load<physics::orbit::ephemeris<double>>("de421.eph"));
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}
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void create_stars(::game& ctx)
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{
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debug::log_trace("Generating fixed stars...");
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// Load star catalog
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auto star_catalog = ctx.resource_manager->load<i18n::string_table>("hipparcos-7.tsv");
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// Allocate star catalog vertex data
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std::size_t star_count = 0;
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if (star_catalog->rows.size() > 0)
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star_count = star_catalog->rows.size() - 1;
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constexpr std::size_t star_vertex_stride = 7 * sizeof(float);
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std::vector<float> star_vertex_data(star_count * star_vertex_stride / sizeof(float));
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float* star_vertex = star_vertex_data.data();
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// Init starlight illuminance
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math::dvec3 starlight_illuminance = {0, 0, 0};
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// Build star catalog vertex data
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for (std::size_t i = 1; i < star_catalog->rows.size(); ++i)
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{
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const auto& row = star_catalog->rows[i];
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// Parse star catalog item
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float ra = 0.0;
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float dec = 0.0;
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float vmag = 0.0;
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float bv = 0.0;
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try
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{
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ra = std::stof(row[1]);
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dec = std::stof(row[2]);
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vmag = std::stof(row[3]);
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bv = std::stof(row[4]);
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}
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catch (const std::exception&)
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{
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debug::log_warning("Invalid star catalog item on row {}", i);
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continue;
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}
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// Convert right ascension and declination from degrees to radians
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ra = math::wrap_radians(math::radians(ra));
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dec = math::wrap_radians(math::radians(dec));
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// Convert ICRF coordinates from spherical to Cartesian
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math::fvec3 position = physics::orbit::frame::bci::cartesian(math::fvec3{1.0f, dec, ra});
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// Convert color index to color temperature
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float cct = color::bv_to_cct(bv);
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// Calculate XYZ color from color temperature
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math::fvec3 color_xyz = color::cct_to_xyz(cct);
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// Transform XYZ color to RGB
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math::fvec3 color_rgb = config::scene_linear_color_space<float>.from_xyz * color_xyz;
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// Convert apparent magnitude to brightness factor relative to a 0th magnitude star
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float brightness = physics::light::vmag::to_brightness(vmag);
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// Build vertex
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*(star_vertex++) = position.x();
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*(star_vertex++) = position.y();
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*(star_vertex++) = position.z();
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*(star_vertex++) = color_rgb.x();
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*(star_vertex++) = color_rgb.y();
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*(star_vertex++) = color_rgb.z();
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*(star_vertex++) = brightness;
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// Calculate spectral illuminance
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math::dvec3 illuminance = math::dvec3(color_rgb * physics::light::vmag::to_illuminance(vmag));
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// Add spectral illuminance to total starlight illuminance
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starlight_illuminance += illuminance;
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}
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// Allocate stars model
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std::shared_ptr<render::model> stars_model = std::make_shared<render::model>();
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// Construct stars VAO
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constexpr gl::vertex_input_attribute star_vertex_attributes[] =
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{
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{
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render::vertex_attribute_location::position,
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0,
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gl::format::r32g32b32_sfloat,
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0
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},
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{
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render::vertex_attribute_location::color,
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0,
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gl::format::r32g32b32a32_sfloat,
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3 * sizeof(float)
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}
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};
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auto& vao = stars_model->get_vertex_array();
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vao = std::make_unique<gl::vertex_array>(star_vertex_attributes);
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// Construct stars VBO
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auto& vbo = stars_model->get_vertex_buffer();
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vbo = std::make_unique<gl::vertex_buffer>(gl::buffer_usage::static_draw, std::as_bytes(std::span{star_vertex_data}));
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stars_model->set_vertex_offset(0);
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stars_model->set_vertex_stride(star_vertex_stride);
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// Construct star model group
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stars_model->get_groups().resize(1);
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render::model_group& stars_model_group = stars_model->get_groups().front();
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stars_model_group.id = "stars";
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stars_model_group.material = ctx.resource_manager->load<render::material>("fixed-star.mtl");
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stars_model_group.primitive_topology = gl::primitive_topology::point_list;
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stars_model_group.first_vertex = 0;
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stars_model_group.vertex_count = static_cast<std::uint32_t>(star_count);
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// Pass stars model to sky pass
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ctx.sky_pass->set_stars_model(stars_model);
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// Pass starlight illuminance to astronomy system
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ctx.astronomy_system->set_starlight_illuminance(starlight_illuminance);
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debug::log_trace("Generated fixed stars");
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}
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void create_sun(::game& ctx)
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{
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debug::log_trace("Generating Sun...");
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{
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// Create sun entity
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auto sun_archetype = ctx.resource_manager->load<entity::archetype>("sun.ent");
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entity::id sun_eid = sun_archetype->create(*ctx.entity_registry);
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ctx.entities["sun"] = sun_eid;
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// Create sun directional light scene object
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ctx.sun_light = std::make_unique<scene::directional_light>();
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ctx.sun_light->set_shadow_caster(true);
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ctx.sun_light->set_shadow_framebuffer(ctx.shadow_map_framebuffer);
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ctx.sun_light->set_shadow_bias(0.005f);
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ctx.sun_light->set_shadow_max_distance(20.0f);
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ctx.sun_light->set_shadow_fade_range(5.0f);
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ctx.sun_light->set_shadow_cascade_count(4);
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ctx.sun_light->set_shadow_cascade_distribution(0.8f);
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// Add sun light scene objects to surface scene
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ctx.surface_scene->add_object(*ctx.sun_light);
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// Pass direct sun light scene object to shadow map pass and astronomy system
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ctx.astronomy_system->set_sun_light(ctx.sun_light.get());
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}
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debug::log_trace("Generated Sun");
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}
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void create_earth_moon_system(::game& ctx)
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{
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debug::log_trace("Generating Earth-Moon system...");
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{
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// Create Earth-Moon barycenter entity
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auto em_bary_archetype = ctx.resource_manager->load<entity::archetype>("em-bary.ent");
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entity::id em_bary_eid = em_bary_archetype->create(*ctx.entity_registry);
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ctx.entities["em_bary"] = em_bary_eid;
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// Create Earth
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create_earth(ctx);
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// Create Moon
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create_moon(ctx);
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}
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debug::log_trace("Generated Earth-Moon system");
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}
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void create_earth(::game& ctx)
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{
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debug::log_trace("Generating Earth...");
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{
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// Create earth entity
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auto earth_archetype = ctx.resource_manager->load<entity::archetype>("earth.ent");
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entity::id earth_eid = earth_archetype->create(*ctx.entity_registry);
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ctx.entities["earth"] = earth_eid;
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// Assign orbital parent
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ctx.entity_registry->get<::orbit_component>(earth_eid).parent = ctx.entities["em_bary"];
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}
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debug::log_trace("Generated Earth");
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}
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void create_moon(::game& ctx)
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{
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debug::log_trace("Generating Moon...");
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{
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// Create lunar entity
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auto moon_archetype = ctx.resource_manager->load<entity::archetype>("moon.ent");
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entity::id moon_eid = moon_archetype->create(*ctx.entity_registry);
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ctx.entities["moon"] = moon_eid;
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// Assign orbital parent
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ctx.entity_registry->get<::orbit_component>(moon_eid).parent = ctx.entities["em_bary"];
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// Pass moon model to sky pass
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ctx.sky_pass->set_moon_model(ctx.resource_manager->load<render::model>("moon.mdl"));
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// Create moon directional light scene object
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ctx.moon_light = std::make_unique<scene::directional_light>();
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// Add moon light scene objects to surface scene
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ctx.surface_scene->add_object(*ctx.moon_light);
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// Pass moon light scene object to astronomy system
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ctx.astronomy_system->set_moon_light(ctx.moon_light.get());
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}
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debug::log_trace("Generated Moon");
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}
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void enter_ecoregion(::game& ctx, const ecoregion& ecoregion)
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{
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debug::log_trace("Entering ecoregion {}...", ecoregion.name);
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{
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// Set active ecoregion
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//ctx.active_ecoregion = &ecoregion;
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// Set location
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::world::set_location(ctx, ecoregion.elevation, ecoregion.latitude, ecoregion.longitude);
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// Setup sky
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ctx.sky_pass->set_sky_model(ctx.resource_manager->load<render::model>("celestial-hemisphere.mdl"));
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ctx.sky_pass->set_ground_albedo(ecoregion.terrain_albedo);
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// Setup terrain
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// ctx.terrain_system->set_patch_material(ecoregion.terrain_material);
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// ctx.terrain_system->set_elevation_function
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// (
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// [](float x, float z) -> float
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// {
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// const math::fvec2 position = math::fvec2{x, z};
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// const std::size_t octaves = 3;
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// const float lacunarity = 1.5f;
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// const float gain = 0.5f;
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// const float fbm = math::noise::fbm
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// (
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// position * 0.005f,
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// octaves,
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// lacunarity,
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// gain
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// );
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// float y = fbm * 4.0f;
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// return y;
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// }
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// );
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}
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debug::log_trace("Entered ecoregion {}", ecoregion.name);
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}
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void switch_scene(::game& ctx)
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{
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ctx.fade_transition_color->set({0, 0, 0});
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ctx.fade_transition->transition(1.0f, false, ease<float>::out_cubic, false, [](){});
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}
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} // namespace world
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