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- /*
- * Copyright (C) 2020 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/systems/weather-system.hpp"
- #include "scene/directional-light.hpp"
- #include "renderer/passes/sky-pass.hpp"
- #include "renderer/passes/shadow-map-pass.hpp"
- #include "renderer/passes/material-pass.hpp"
- #include "utility/gamma.hpp"
- #include "resources/image.hpp"
- #include <cmath>
- #include <iostream>
-
- static constexpr float seconds_per_day = 24.0f * 60.0f * 60.0f;
-
- weather_system::weather_system(entt::registry& registry):
- entity_system(registry),
- ambient_light(nullptr),
- sun_light(nullptr),
- moon_light(nullptr),
- shadow_light(nullptr),
- sky_pass(nullptr),
- shadow_map_pass(nullptr),
- material_pass(nullptr),
- time_of_day(0.0f),
- time_scale(1.0f),
- sky_palette(nullptr),
- shadow_palette(nullptr),
- sun_direction{0.0f, -1.0f, 0.0f}
- {}
-
- void weather_system::update(double t, double dt)
- {
- set_time_of_day(time_of_day + dt * time_scale);
- }
-
- void weather_system::set_ambient_light(::ambient_light* light)
- {
- this->ambient_light = light;
- }
-
- void weather_system::set_sun_light(directional_light* light)
- {
- sun_light = light;
-
- if (sky_pass)
- {
- sky_pass->set_sun_light(sun_light);
- }
- }
-
- void weather_system::set_moon_light(directional_light* light)
- {
- moon_light = light;
- }
-
- void weather_system::set_sky_pass(::sky_pass* pass)
- {
- sky_pass = pass;
-
- if (sky_pass)
- {
- sky_pass->set_sun_light(sun_light);
- }
- }
-
- void weather_system::set_shadow_map_pass(::shadow_map_pass* pass)
- {
- shadow_map_pass = pass;
-
- if (shadow_map_pass)
- {
- shadow_map_pass->set_light(shadow_light);
- }
- }
-
- void weather_system::set_material_pass(::material_pass* pass)
- {
- material_pass = pass;
-
- if (material_pass)
- {
- material_pass->set_shadow_strength(0.75f);
- }
- }
-
- void weather_system::set_time_of_day(float t)
- {
- time_of_day = std::fmod(t, seconds_per_day);
-
- //sun_azimuth = 0.0f;
- //sun_elevation = (time_of_day / seconds_per_day) * math::two_pi<float> - math::half_pi<float>;
-
- float hour_angle = math::wrap_radians(time_of_day * (math::two_pi<float> / seconds_per_day) - math::pi<float>);
- float declination = math::radians(0.0f);
- float latitude = math::radians(0.0f);
-
-
- sun_elevation = std::asin(std::sin(declination) * std::sin(latitude) + std::cos(declination) * std::cos(hour_angle) * std::cos(latitude));
- sun_azimuth = std::acos((std::sin(declination) * std::cos(latitude) - std::cos(declination) * std::cos(hour_angle) * std::sin(latitude)) / std::cos(sun_elevation));
- if (hour_angle < 0.0f)
- sun_azimuth = math::two_pi<float> - sun_azimuth;
-
- //std::cout << "hour angle: " << math::degrees(hour_angle) << std::endl;
- //std::cout << "azimuth: " << math::degrees(sun_azimuth) << std::endl;
- //std::cout << "time: " << (time_of_day / 60.0f / 60.0f) << std::endl;
-
- math::quaternion<float> sun_azimuth_rotation = math::angle_axis(sun_azimuth, float3{0, 1, 0});
- math::quaternion<float> sun_elevation_rotation = math::angle_axis(sun_elevation, float3{-1, 0, 0});
- math::quaternion<float> sun_rotation = math::normalize(sun_azimuth_rotation * sun_elevation_rotation);
- sun_direction = math::normalize(sun_rotation * float3{0, 0, -1});
-
- if (sun_light)
- {
- sun_light->set_rotation(sun_rotation);
- }
-
- if (sky_pass)
- {
- sky_pass->set_sky_gradient(sky_gradient);
- }
-
- shadow_light = sun_light;
- if (shadow_map_pass)
- {
- shadow_map_pass->set_light(shadow_light);
- }
- }
-
- void weather_system::set_time_scale(float scale)
- {
- time_scale = scale;
- }
-
- void weather_system::set_sky_palette(const ::image* image)
- {
- sky_palette = image;
- if (sky_palette)
- {
- unsigned int w = image->get_width();
- unsigned int h = image->get_height();
- unsigned int c = image->get_channels();
- const unsigned char* pixels = static_cast<const unsigned char*>(image->get_pixels());
-
- for (unsigned int x = 0; x < w; ++x)
- {
- for (unsigned int y = 0; y < std::min<unsigned int>(4, h); ++y)
- {
- unsigned int i = y * w * c + x * c;
- float r = srgb_to_linear(static_cast<float>(pixels[i]) / 255.0f);
- float g = srgb_to_linear(static_cast<float>(pixels[i + 1]) / 255.0f);
- float b = srgb_to_linear(static_cast<float>(pixels[i + 2]) / 255.0f);
-
- sky_gradient[y] = {r, g, b, static_cast<float>(y) * (1.0f / 3.0f)};
- }
- }
- }
- }
-
- void weather_system::set_shadow_palette(const ::image* image)
- {
- shadow_palette = image;
- }
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