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- /*
- * Copyright (C) 2021 Christopher J. Howard
- *
- * This file is part of Antkeeper source code.
- *
- * Antkeeper source code is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * Antkeeper source code is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with Antkeeper source code. If not, see <http://www.gnu.org/licenses/>.
- */
-
- #include "game/states/loading.hpp"
- #include "application.hpp"
- #include "astro/illuminance.hpp"
- #include "color/color.hpp"
- #include "entity/components/atmosphere.hpp"
- #include "entity/components/blackbody.hpp"
- #include "entity/components/celestial-body.hpp"
- #include "entity/components/orbit.hpp"
- #include "entity/components/terrain.hpp"
- #include "entity/components/transform.hpp"
- #include "entity/systems/astronomy.hpp"
- #include "entity/systems/orbit.hpp"
- #include "game/states/nuptial-flight.hpp"
- #include "game/states/splash.hpp"
- #include "geom/spherical.hpp"
- #include "gl/drawing-mode.hpp"
- #include "gl/vertex-array.hpp"
- #include "gl/vertex-attribute-type.hpp"
- #include "gl/vertex-buffer.hpp"
- #include "physics/light/photometry.hpp"
- #include "physics/orbit/orbit.hpp"
- #include "renderer/material.hpp"
- #include "renderer/model.hpp"
- #include "renderer/passes/shadow-map-pass.hpp"
- #include "renderer/vertex-attributes.hpp"
- #include "resources/resource-manager.hpp"
- #include "scene/ambient-light.hpp"
- #include "scene/directional-light.hpp"
-
- namespace game {
- namespace state {
- namespace loading {
-
- /// Creates the universe and solar system.
- static void cosmogenesis(game::context* ctx);
-
- /// Creates a sun.
- static void heliogenesis(game::context* ctx);
-
- /// Creates a planet.
- static void planetogenesis(game::context* ctx);
-
- /// Creates a moon.
- static void selenogenesis(game::context* ctx);
-
- /// Creates fixed stars.
- static void extrasolar_heliogenesis(game::context* ctx);
-
- /// Creates an ant colony
- static void colonigenesis(game::context* ctx);
-
- void enter(game::context* ctx)
- {
- // Create universe
- ctx->logger->push_task("Creating the universe");
- try
- {
- cosmogenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
-
- // Determine next game state
- application::state next_state;
- if (ctx->option_quick_start.has_value())
- {
- next_state.name = "nuptial flight";
- next_state.enter = std::bind(game::state::nuptial_flight::enter, ctx);
- next_state.exit = std::bind(game::state::nuptial_flight::exit, ctx);
- }
- else
- {
- next_state.name = "splash";
- next_state.enter = std::bind(game::state::splash::enter, ctx);
- next_state.exit = std::bind(game::state::splash::exit, ctx);
- }
-
- // Queue next game state
- ctx->app->queue_state(next_state);
- }
-
- void exit(game::context* ctx)
- {}
-
- void cosmogenesis(game::context* ctx)
- {
- // Init time
- const double time = 0.0;
- ctx->astronomy_system->set_universal_time(time);
- ctx->orbit_system->set_universal_time(time);
-
- // Create sun
- ctx->logger->push_task("Creating the sun");
- try
- {
- heliogenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
-
- // Create planet
- ctx->logger->push_task("Creating the planet");
- try
- {
- planetogenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
-
- // Create moon
- ctx->logger->push_task("Creating the moon");
- try
- {
- selenogenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
-
- // Create fixed stars
- ctx->logger->push_task("Creating fixed stars");
- try
- {
- extrasolar_heliogenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
-
- // Create ant colony
- ctx->logger->push_task("Creating ant colony");
- try
- {
- colonigenesis(ctx);
- }
- catch (...)
- {
- ctx->logger->pop_task(EXIT_FAILURE);
- throw;
- }
- ctx->logger->pop_task(EXIT_SUCCESS);
- }
-
- void heliogenesis(game::context* ctx)
- {
- // Create solar entity
- auto sun_eid = ctx->entity_registry->create();
-
- // Name solar entity
- ctx->named_entities["sun"] = sun_eid;
-
- // Assign solar celestial body component
- entity::component::celestial_body body;
- body.radius = 6.957e+8;
- body.axial_tilt = math::radians(0.0);
- body.axial_rotation = math::radians(0.0);
- body.angular_frequency = math::radians(0.0);
- ctx->entity_registry->assign<entity::component::celestial_body>(sun_eid, body);
-
- // Assign solar orbit component
- entity::component::orbit orbit;
- orbit.elements.a = 0.0;
- orbit.elements.e = 0.0;
- orbit.elements.i = math::radians(0.0);
- orbit.elements.raan = math::radians(0.0);
- orbit.elements.w = math::radians(0.0);
- orbit.elements.ta = math::radians(0.0);
- ctx->entity_registry->assign<entity::component::orbit>(sun_eid, orbit);
-
- // Assign solar blackbody component
- entity::component::blackbody blackbody;
- blackbody.temperature = 5778.0;
- ctx->entity_registry->assign<entity::component::blackbody>(sun_eid, blackbody);
-
- // Assign solar transform component
- entity::component::transform transform;
- transform.local = math::identity_transform<float>;
- transform.warp = true;
- ctx->entity_registry->assign<entity::component::transform>(sun_eid, transform);
-
- // Create direct sun light scene object
- scene::directional_light* sun_direct = new scene::directional_light();
-
- // Create ambient sun light scene object
- scene::ambient_light* sun_ambient = new scene::ambient_light();
- sun_ambient->set_color({1, 1, 1});
- sun_ambient->set_intensity(0.0f);
- sun_ambient->update_tweens();
-
- // Add sun light scene objects to surface scene
- ctx->surface_scene->add_object(sun_direct);
- ctx->surface_scene->add_object(sun_ambient);
-
- // Pass direct sun light scene object to shadow map pass and astronomy system
- ctx->surface_shadow_map_pass->set_light(sun_direct);
- ctx->astronomy_system->set_sun_light(sun_direct);
- }
-
- void planetogenesis(game::context* ctx)
- {
- // Create planetary entity
- auto planet_eid = ctx->entity_registry->create();
-
- // Name planetary entity
- ctx->named_entities["planet"] = planet_eid;
-
- // Assign planetary celestial body component
- entity::component::celestial_body body;
- body.radius = 6.3781e6;
- body.axial_tilt = math::radians(23.4393);
- body.axial_rotation = math::radians(280.46061837504);
- body.angular_frequency = math::radians(360.9856122880876128);
- ctx->entity_registry->assign<entity::component::celestial_body>(planet_eid, body);
-
- // Assign planetary orbit component
- entity::component::orbit orbit;
- orbit.elements.a = 1.496e+11;
- orbit.elements.e = 0.01671123;
- orbit.elements.i = math::radians(-0.00001531);
- orbit.elements.raan = math::radians(0.0);
- const double longitude_periapsis = math::radians(102.93768193);
- orbit.elements.w = longitude_periapsis - orbit.elements.raan;
- orbit.elements.ta = math::radians(100.46457166) - longitude_periapsis;
- ctx->entity_registry->assign<entity::component::orbit>(planet_eid, orbit);
-
- // Assign planetary terrain component
- entity::component::terrain terrain;
- terrain.elevation = [](double, double) -> double
- {
- //return math::random<double>(0.0, 1.0);
- return 0.0;
- };
- terrain.max_lod = 0;
- terrain.patch_material = nullptr;
- ctx->entity_registry->assign<entity::component::terrain>(planet_eid, terrain);
-
- // Assign planetary atmosphere component
- entity::component::atmosphere atmosphere;
- atmosphere.exosphere_altitude = 65e3;
- atmosphere.index_of_refraction = 1.000293;
- atmosphere.rayleigh_density = 2.545e25;
- atmosphere.rayleigh_scale_height = 8000.0;
- atmosphere.mie_density = 14.8875;
- atmosphere.mie_scale_height = 1200.0;
- atmosphere.mie_anisotropy = 0.8;
- ctx->entity_registry->assign<entity::component::atmosphere>(planet_eid, atmosphere);
-
- // Assign planetary transform component
- entity::component::transform transform;
- transform.local = math::identity_transform<float>;
- transform.warp = true;
- ctx->entity_registry->assign<entity::component::transform>(planet_eid, transform);
-
- // Pass planet to astronomy system as reference body
- ctx->astronomy_system->set_reference_body(planet_eid);
-
- // Load sky model
- ctx->surface_sky_pass->set_sky_model(ctx->resource_manager->load<model>("sky-dome.mdl"));
- }
-
- void selenogenesis(game::context* ctx)
- {
- // Create lunar entity
- auto moon_eid = ctx->entity_registry->create();
-
- // Name lunar entity
- ctx->named_entities["moon"] = moon_eid;
-
- // Pass moon model to sky pass
- ctx->surface_sky_pass->set_moon_model(ctx->resource_manager->load<model>("moon.mdl"));
- }
-
- void extrasolar_heliogenesis(game::context* ctx)
- {
- // Load star catalog
- string_table* star_catalog = ctx->resource_manager->load<string_table>("stars.csv");
-
- // Allocate star catalog vertex data
- std::size_t star_count = 0;
- if (star_catalog->size() > 0)
- star_count = star_catalog->size() - 1;
- std::size_t star_vertex_size = 6;
- std::size_t star_vertex_stride = star_vertex_size * sizeof(float);
- float* star_vertex_data = new float[star_count * star_vertex_size];
- float* star_vertex = star_vertex_data;
-
- // Build star catalog vertex data
- for (std::size_t i = 1; i < star_catalog->size(); ++i)
- {
- const string_table_row& catalog_row = (*star_catalog)[i];
-
- double ra = 0.0;
- double dec = 0.0;
- double vmag = 0.0;
- double bv_color = 0.0;
-
- // Parse star catalog entry
- try
- {
- ra = std::stod(catalog_row[1]);
- dec = std::stod(catalog_row[2]);
- vmag = std::stod(catalog_row[3]);
- bv_color = std::stod(catalog_row[4]);
- }
- catch (const std::exception& e)
- {
- continue;
- }
-
- // Convert right ascension and declination from degrees to radians
- ra = math::wrap_radians(math::radians(ra));
- dec = math::wrap_radians(math::radians(dec));
-
- // Transform spherical equatorial coordinates to rectangular equatorial coordinates
- double3 position_bci = geom::spherical::to_cartesian(double3{1.0, dec, ra});
-
- // Transform coordinates from equatorial space to inertial space
- physics::frame<double> bci_to_inertial = physics::orbit::inertial::to_bci({0, 0, 0}, 0.0, math::radians(23.4393)).inverse();
- double3 position_inertial = bci_to_inertial * position_bci;
-
- // Convert color index to color temperature
- double cct = color::index::bv_to_cct(bv_color);
-
- // Calculate XYZ color from color temperature
- double3 color_xyz = color::cct::to_xyz(cct);
-
- // Transform XYZ color to ACEScg colorspace
- double3 color_acescg = color::xyz::to_acescg(color_xyz);
-
- // Convert apparent magnitude to irradiance (W/m^2)
- double vmag_irradiance = std::pow(10.0, 0.4 * (-vmag - 19.0 + 0.4));
-
- // Convert irradiance to illuminance
- double vmag_illuminance = vmag_irradiance * (683.0 * 0.14);
-
- // Scale color by illuminance
- double3 scaled_color = color_acescg * vmag_illuminance;
-
- // Build vertex
- *(star_vertex++) = static_cast<float>(position_inertial.x);
- *(star_vertex++) = static_cast<float>(position_inertial.y);
- *(star_vertex++) = static_cast<float>(position_inertial.z);
- *(star_vertex++) = static_cast<float>(scaled_color.x);
- *(star_vertex++) = static_cast<float>(scaled_color.y);
- *(star_vertex++) = static_cast<float>(scaled_color.z);
- }
-
- // Unload star catalog
- ctx->resource_manager->unload("stars.csv");
-
- // Allocate stars model
- model* stars_model = new model();
-
- // Resize model VBO and upload vertex data
- gl::vertex_buffer* vbo = stars_model->get_vertex_buffer();
- vbo->resize(star_count * star_vertex_stride, star_vertex_data);
-
- // Free star catalog vertex data
- delete[] star_vertex_data;
-
- // Bind vertex attributes to model VAO
- gl::vertex_array* vao = stars_model->get_vertex_array();
- std::size_t vao_offset = 0;
- vao->bind_attribute(VERTEX_POSITION_LOCATION, *vbo, 3, gl::vertex_attribute_type::float_32, star_vertex_stride, 0);
- vao_offset += 3;
- vao->bind_attribute(VERTEX_COLOR_LOCATION, *vbo, 3, gl::vertex_attribute_type::float_32, star_vertex_stride, sizeof(float) * vao_offset);
-
- // Load star material
- material* star_material = ctx->resource_manager->load<material>("fixed-star.mtl");
-
- // Create model group
- model_group* stars_model_group = stars_model->add_group("stars");
- stars_model_group->set_material(star_material);
- stars_model_group->set_drawing_mode(gl::drawing_mode::points);
- stars_model_group->set_start_index(0);
- stars_model_group->set_index_count(star_count);
-
- // Pass stars model to sky pass
- ctx->surface_sky_pass->set_stars_model(stars_model);
- }
-
- void colonigenesis(game::context* ctx)
- {
- // Create queen entity
- auto queen_eid = ctx->entity_registry->create();
- ctx->named_entities["queen"] = queen_eid;
-
- // Create central shaft entity
- auto shaft_eid = ctx->entity_registry->create();
- ctx->named_entities["shaft"] = queen_eid;
-
- // Create entrance "lobby" chamber entity
- auto lobby_eid = ctx->entity_registry->create();
- ctx->named_entities["lobby"] = lobby_eid;
-
- }
-
- } // namespace loading
- } // namespace state
- } // namespace game
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