💿🐜 Antkeeper source code
https://antkeeper.com
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
528 lines
15 KiB
528 lines
15 KiB
/*
|
|
* 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/world.hpp"
|
|
#include "scene/text.hpp"
|
|
#include "physics/light/vmag.hpp"
|
|
#include "color/color.hpp"
|
|
#include "game/component/atmosphere.hpp"
|
|
#include "game/component/blackbody.hpp"
|
|
#include "game/component/celestial-body.hpp"
|
|
#include "game/component/orbit.hpp"
|
|
#include "game/component/terrain.hpp"
|
|
#include "game/component/transform.hpp"
|
|
#include "game/component/observer.hpp"
|
|
#include "game/system/astronomy.hpp"
|
|
#include "game/system/orbit.hpp"
|
|
#include "game/system/atmosphere.hpp"
|
|
#include "entity/commands.hpp"
|
|
#include "entity/archetype.hpp"
|
|
#include "geom/spherical.hpp"
|
|
#include "gl/drawing-mode.hpp"
|
|
#include "gl/vertex-array.hpp"
|
|
#include "gl/vertex-attribute.hpp"
|
|
#include "gl/vertex-buffer.hpp"
|
|
#include "physics/light/photometry.hpp"
|
|
#include "physics/orbit/orbit.hpp"
|
|
#include "physics/orbit/ephemeris.hpp"
|
|
#include "physics/time/gregorian.hpp"
|
|
#include "physics/time/constants.hpp"
|
|
#include "physics/time/utc.hpp"
|
|
#include "render/material.hpp"
|
|
#include "render/model.hpp"
|
|
#include "render/passes/shadow-map-pass.hpp"
|
|
#include "render/vertex-attribute.hpp"
|
|
#include "resources/resource-manager.hpp"
|
|
#include "scene/ambient-light.hpp"
|
|
#include "scene/directional-light.hpp"
|
|
#include "gl/texture-wrapping.hpp"
|
|
#include "gl/texture-filter.hpp"
|
|
#include "render/material-flags.hpp"
|
|
#include "geom/solid-angle.hpp"
|
|
#include "config.hpp"
|
|
#include <iostream>
|
|
|
|
namespace game {
|
|
namespace world {
|
|
|
|
/// Loads an ephemeris.
|
|
static void load_ephemeris(game::context& ctx);
|
|
|
|
/// Creates the fixed stars.
|
|
static void create_stars(game::context& ctx);
|
|
|
|
/// Creates the Sun.
|
|
static void create_sun(game::context& ctx);
|
|
|
|
/// Creates the Earth-Moon system.
|
|
static void create_earth_moon_system(game::context& ctx);
|
|
|
|
/// Creates the Earth.
|
|
static void create_earth(game::context& ctx);
|
|
|
|
/// Creates the Moon.
|
|
static void create_moon(game::context& ctx);
|
|
|
|
void cosmogenesis(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating cosmos");
|
|
|
|
load_ephemeris(ctx);
|
|
create_stars(ctx);
|
|
create_sun(ctx);
|
|
create_earth_moon_system(ctx);
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_observer(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Creating observer");
|
|
|
|
try
|
|
{
|
|
// Create observer entity
|
|
entity::id observer_eid = ctx.entity_registry->create();
|
|
ctx.entities["observer"] = observer_eid;
|
|
|
|
// Construct observer component
|
|
game::component::observer observer;
|
|
|
|
// Set observer reference body
|
|
if (auto it = ctx.entities.find("earth"); it != ctx.entities.end())
|
|
observer.reference_body_eid = it->second;
|
|
else
|
|
observer.reference_body_eid = entt::null;
|
|
|
|
// Set observer location
|
|
observer.elevation = 0.0;
|
|
observer.latitude = 0.0;
|
|
observer.longitude = 0.0;
|
|
|
|
// Assign observer component to observer entity
|
|
ctx.entity_registry->emplace<game::component::observer>(observer_eid, observer);
|
|
|
|
// Set atmosphere system active atmosphere
|
|
ctx.atmosphere_system->set_active_atmosphere(observer.reference_body_eid);
|
|
|
|
// Set astronomy system observer
|
|
ctx.astronomy_system->set_observer(observer_eid);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void set_location(game::context& ctx, double elevation, double latitude, double longitude)
|
|
{
|
|
if (auto it = ctx.entities.find("observer"); it != ctx.entities.end())
|
|
{
|
|
entity::id observer_eid = it->second;
|
|
|
|
if (ctx.entity_registry->valid(observer_eid) && ctx.entity_registry->all_of<game::component::observer>(observer_eid))
|
|
{
|
|
// Update observer location
|
|
ctx.entity_registry->patch<game::component::observer>
|
|
(
|
|
observer_eid,
|
|
[&](auto& component)
|
|
{
|
|
component.elevation = elevation;
|
|
component.latitude = latitude;
|
|
component.longitude = longitude;
|
|
}
|
|
);
|
|
}
|
|
}
|
|
}
|
|
|
|
void set_time(game::context& ctx, double t)
|
|
{
|
|
ctx.logger->push_task("Setting time to UT1 " + std::to_string(t));
|
|
try
|
|
{
|
|
ctx.astronomy_system->set_time(t);
|
|
ctx.orbit_system->set_time(t);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void set_time(game::context& ctx, int year, int month, int day, int hour, int minute, double second)
|
|
{
|
|
double longitude = 0.0;
|
|
|
|
// Get longitude of observer
|
|
if (auto it = ctx.entities.find("observer"); it != ctx.entities.end())
|
|
{
|
|
entity::id observer_eid = it->second;
|
|
if (ctx.entity_registry->valid(observer_eid))
|
|
{
|
|
const auto observer = ctx.entity_registry->try_get<game::component::observer>(observer_eid);
|
|
if (observer)
|
|
longitude = observer->longitude;
|
|
}
|
|
}
|
|
|
|
// Calculate UTC offset at longitude
|
|
const double utc_offset = physics::time::utc::offset<double>(longitude);
|
|
|
|
// Convert time from Gregorian to UT1
|
|
const double t = physics::time::gregorian::to_ut1<double>(year, month, day, hour, minute, second, utc_offset);
|
|
|
|
set_time(ctx, t);
|
|
}
|
|
|
|
void set_time_scale(game::context& ctx, double scale)
|
|
{
|
|
// Convert time scale from seconds to days
|
|
const double astronomical_scale = scale / physics::time::seconds_per_day<double>;
|
|
|
|
ctx.orbit_system->set_time_scale(astronomical_scale);
|
|
ctx.astronomy_system->set_time_scale(astronomical_scale);
|
|
}
|
|
|
|
void load_ephemeris(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Loading ephemeris");
|
|
|
|
try
|
|
{
|
|
std::string ephemeris_filename;
|
|
if (ctx.config->contains("ephemeris"))
|
|
{
|
|
ephemeris_filename = (*ctx.config)["ephemeris"].get<std::string>();
|
|
}
|
|
else
|
|
{
|
|
ctx.logger->warning("No ephemeris set in config");
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.orbit_system->set_ephemeris(ctx.resource_manager->load<physics::orbit::ephemeris<double>>(ephemeris_filename));
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_stars(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating fixed stars");
|
|
|
|
// Load star catalog
|
|
string_table* star_catalog = nullptr;
|
|
try
|
|
{
|
|
std::string star_catalog_filename;
|
|
if (ctx.config->contains("star_catalog"))
|
|
{
|
|
star_catalog_filename = (*ctx.config)["star_catalog"].get<std::string>();
|
|
}
|
|
else
|
|
{
|
|
ctx.logger->warning("No star catalog set in config");
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
star_catalog = ctx.resource_manager->load<string_table>(star_catalog_filename);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
// 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 = 7;
|
|
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;
|
|
|
|
// Init starlight illuminance
|
|
double3 starlight_illuminance = {0, 0, 0};
|
|
|
|
// 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];
|
|
|
|
// Parse star catalog item
|
|
double ra = 0.0;
|
|
double dec = 0.0;
|
|
double vmag = 0.0;
|
|
double bv = 0.0;
|
|
try
|
|
{
|
|
ra = std::stod(catalog_row[1]);
|
|
dec = std::stod(catalog_row[2]);
|
|
vmag = std::stod(catalog_row[3]);
|
|
bv = std::stod(catalog_row[4]);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->warning("Invalid star catalog item on row " + std::to_string(i));
|
|
}
|
|
|
|
// Convert right ascension and declination from degrees to radians
|
|
ra = math::wrap_radians(math::radians(ra));
|
|
dec = math::wrap_radians(math::radians(dec));
|
|
|
|
// Convert ICRF coordinates from spherical to Cartesian
|
|
double3 position = physics::orbit::frame::bci::cartesian(double3{1.0, dec, ra});
|
|
|
|
// Convert color index to color temperature
|
|
double cct = color::index::bv_to_cct(bv);
|
|
|
|
// Calculate XYZ color from color temperature
|
|
double3 color_xyz = color::cct::to_xyz(cct);
|
|
|
|
// Transform XYZ color to ACEScg colorspace
|
|
double3 color_acescg = color::aces::ap1<double>.from_xyz * color_xyz;
|
|
|
|
// Convert apparent magnitude to brightness factor relative to a 0th magnitude star
|
|
double brightness = physics::light::vmag::to_brightness(vmag);
|
|
|
|
// Build vertex
|
|
*(star_vertex++) = static_cast<float>(position.x());
|
|
*(star_vertex++) = static_cast<float>(position.y());
|
|
*(star_vertex++) = static_cast<float>(position.z());
|
|
*(star_vertex++) = static_cast<float>(color_acescg.x());
|
|
*(star_vertex++) = static_cast<float>(color_acescg.y());
|
|
*(star_vertex++) = static_cast<float>(color_acescg.z());
|
|
*(star_vertex++) = static_cast<float>(brightness);
|
|
|
|
// Calculate spectral illuminance
|
|
double3 illuminance = color_acescg * physics::light::vmag::to_illuminance(vmag);
|
|
|
|
// Add spectral illuminance to total starlight illuminance
|
|
starlight_illuminance += illuminance;
|
|
}
|
|
|
|
// Unload star catalog
|
|
ctx.resource_manager->unload("stars.csv");
|
|
|
|
// Allocate stars model
|
|
render::model* stars_model = new render::model();
|
|
|
|
// Get model VBO and VAO
|
|
gl::vertex_buffer* vbo = stars_model->get_vertex_buffer();
|
|
gl::vertex_array* vao = stars_model->get_vertex_array();
|
|
|
|
// Resize model VBO and upload vertex data
|
|
vbo->resize(star_count * star_vertex_stride, star_vertex_data);
|
|
|
|
// Free star catalog vertex data
|
|
delete[] star_vertex_data;
|
|
|
|
std::size_t attribute_offset = 0;
|
|
|
|
// Define position vertex attribute
|
|
gl::vertex_attribute position_attribute;
|
|
position_attribute.buffer = vbo;
|
|
position_attribute.offset = attribute_offset;
|
|
position_attribute.stride = star_vertex_stride;
|
|
position_attribute.type = gl::vertex_attribute_type::float_32;
|
|
position_attribute.components = 3;
|
|
attribute_offset += position_attribute.components * sizeof(float);
|
|
|
|
// Define color vertex attribute
|
|
gl::vertex_attribute color_attribute;
|
|
color_attribute.buffer = vbo;
|
|
color_attribute.offset = attribute_offset;
|
|
color_attribute.stride = star_vertex_stride;
|
|
color_attribute.type = gl::vertex_attribute_type::float_32;
|
|
color_attribute.components = 4;
|
|
attribute_offset += color_attribute.components * sizeof(float);
|
|
|
|
// Bind vertex attributes to VAO
|
|
vao->bind(render::vertex_attribute::position, position_attribute);
|
|
vao->bind(render::vertex_attribute::color, color_attribute);
|
|
|
|
// Load star material
|
|
render::material* star_material = ctx.resource_manager->load<render::material>("fixed-star.mtl");
|
|
|
|
// Create model group
|
|
render::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.sky_pass->set_stars_model(stars_model);
|
|
|
|
// Pass starlight illuminance to astronomy system
|
|
ctx.astronomy_system->set_starlight_illuminance(starlight_illuminance);
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_sun(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating Sun");
|
|
|
|
try
|
|
{
|
|
// Create sun entity
|
|
entity::archetype* sun_archetype = ctx.resource_manager->load<entity::archetype>("sun.ent");
|
|
entity::id sun_eid = sun_archetype->create(*ctx.entity_registry);
|
|
ctx.entities["sun"] = sun_eid;
|
|
|
|
// Create sun directional light scene object
|
|
scene::directional_light* sun_light = new scene::directional_light();
|
|
sun_light->set_color({0, 0, 0});
|
|
sun_light->update_tweens();
|
|
|
|
// Create sky ambient light scene object
|
|
scene::ambient_light* sky_light = new scene::ambient_light();
|
|
sky_light->set_color({0, 0, 0});
|
|
sky_light->update_tweens();
|
|
|
|
// Create bounce directional light scene object
|
|
scene::directional_light* bounce_light = new scene::directional_light();
|
|
bounce_light->set_color({0, 0, 0});
|
|
bounce_light->look_at({0, 0, 0}, {0, 1, 0}, {1, 0, 0});
|
|
bounce_light->update_tweens();
|
|
|
|
// Add sun light scene objects to surface scene
|
|
ctx.surface_scene->add_object(sun_light);
|
|
ctx.surface_scene->add_object(sky_light);
|
|
//ctx.surface_scene->add_object(bounce_light);
|
|
|
|
// Pass direct sun light scene object to shadow map pass and astronomy system
|
|
ctx.surface_shadow_map_pass->set_light(sun_light);
|
|
ctx.astronomy_system->set_sun_light(sun_light);
|
|
ctx.astronomy_system->set_sky_light(sky_light);
|
|
ctx.astronomy_system->set_bounce_light(bounce_light);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_earth_moon_system(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating Earth-Moon system");
|
|
|
|
try
|
|
{
|
|
// Create Earth-Moon barycenter entity
|
|
entity::archetype* em_bary_archetype = ctx.resource_manager->load<entity::archetype>("em-bary.ent");
|
|
entity::id em_bary_eid = em_bary_archetype->create(*ctx.entity_registry);
|
|
ctx.entities["em_bary"] = em_bary_eid;
|
|
|
|
// Create Earth
|
|
create_earth(ctx);
|
|
|
|
// Create Moon
|
|
create_moon(ctx);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_earth(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating Earth");
|
|
|
|
try
|
|
{
|
|
// Create earth entity
|
|
entity::archetype* earth_archetype = ctx.resource_manager->load<entity::archetype>("earth.ent");
|
|
entity::id earth_eid = earth_archetype->create(*ctx.entity_registry);
|
|
ctx.entities["earth"] = earth_eid;
|
|
|
|
// Assign orbital parent
|
|
ctx.entity_registry->get<game::component::orbit>(earth_eid).parent = ctx.entities["em_bary"];
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
void create_moon(game::context& ctx)
|
|
{
|
|
ctx.logger->push_task("Generating Moon");
|
|
|
|
try
|
|
{
|
|
// Create lunar entity
|
|
entity::archetype* moon_archetype = ctx.resource_manager->load<entity::archetype>("moon.ent");
|
|
entity::id moon_eid = moon_archetype->create(*ctx.entity_registry);
|
|
ctx.entities["moon"] = moon_eid;
|
|
|
|
// Assign orbital parent
|
|
ctx.entity_registry->get<game::component::orbit>(moon_eid).parent = ctx.entities["em_bary"];
|
|
|
|
// Pass moon model to sky pass
|
|
ctx.sky_pass->set_moon_model(ctx.resource_manager->load<render::model>("moon.mdl"));
|
|
|
|
// Create moon directional light scene object
|
|
scene::directional_light* moon_light = new scene::directional_light();
|
|
moon_light->set_color({0, 0, 0});
|
|
moon_light->update_tweens();
|
|
|
|
// Add moon light scene objects to surface scene
|
|
ctx.surface_scene->add_object(moon_light);
|
|
|
|
// Pass moon light scene object to astronomy system
|
|
ctx.astronomy_system->set_moon_light(moon_light);
|
|
}
|
|
catch (const std::exception&)
|
|
{
|
|
ctx.logger->pop_task(EXIT_FAILURE);
|
|
return;
|
|
}
|
|
|
|
ctx.logger->pop_task(EXIT_SUCCESS);
|
|
}
|
|
|
|
} // namespace world
|
|
} // namespace game
|