💿🐜 Antkeeper source code
https://antkeeper.com
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183 lines
5.8 KiB
183 lines
5.8 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 "camera-system.hpp"
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#include "game/components/camera-subject-component.hpp"
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#include "game/components/transform-component.hpp"
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#include "scene/camera.hpp"
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#include "math/math.hpp"
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#include <cmath>
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#include <iostream>
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using namespace ecs;
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camera_system::camera_system(entt::registry& registry):
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entity_system(registry),
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camera(nullptr),
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viewport{0, 0, 0, 0},
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mouse_position{0, 0}
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{}
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void camera_system::update(double t, double dt)
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{
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if (!camera)
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return;
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// Determine focal point
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int subject_count = 0;
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float3 focal_point = {0, 0, 0};
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registry.view<camera_subject_component, transform_component>().each(
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[&](auto entity, auto& subject, auto& transform)
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{
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focal_point += transform.transform.translation;
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++subject_count;
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});
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if (subject_count > 1)
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focal_point /= static_cast<float>(subject_count);
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// Determine focal distance
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float focal_distance = math::log_lerp<float>(focal_distance_far, focal_distance_near, zoom_factor);
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// Determine view point
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quaternion_type rotation = math::normalize(azimuth_rotation * elevation_rotation);
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float3 view_point = focal_point + rotation * float3{0.0f, 0.0f, focal_distance};
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// Update camera transform
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transform_type source_transform = camera->get_transform();
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transform_type target_transform = math::identity_transform<float>;
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target_transform.translation = view_point;
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target_transform.rotation = rotation;
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float2 xz_direction = math::normalize(math::swizzle<0, 2>(focal_point) - math::swizzle<0, 2>(source_transform.translation));
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float source_azimuth = math::wrap_radians(std::atan2(-xz_direction.y, xz_direction.x) - math::half_pi<float>);
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float source_elevation = elevation;
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std::cout << "azimuth: " << math::degrees(azimuth) << "\n";
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std::cout << "source azimuth: " << math::degrees(source_azimuth) << "\n";
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float smooth_factor = 0.1f;
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float smooth_azimuth = math::lerp_angle(source_azimuth, azimuth, smooth_factor);
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float smooth_elevation = math::lerp_angle(source_elevation, elevation, smooth_factor);
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quaternion_type smooth_azimuth_rotation = math::angle_axis(smooth_azimuth, float3{0.0f, 1.0f, 0.0f});
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quaternion_type smooth_elevation_rotation = math::angle_axis(smooth_elevation, float3{-1.0f, 0.0f, 0.0f});
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quaternion_type smooth_rotation = math::normalize(smooth_azimuth_rotation * smooth_elevation_rotation);
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float3 smooth_view_point = focal_point + smooth_rotation * float3{0.0f, 0.0f, focal_distance};
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transform_type smooth_transform;
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smooth_transform.translation = smooth_view_point;
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//smooth_transform.translation = math::lerp(source_transform.translation, target_transform.translation, smooth_factor);
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//smooth_transform.rotation = math::slerp(source_transform.rotation, target_transform.rotation, smooth_factor);
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smooth_transform.rotation = smooth_rotation;
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smooth_transform.scale = math::lerp(source_transform.scale, target_transform.scale, smooth_factor);
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camera->set_transform(smooth_transform);
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// Determine FOV
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float fov = math::log_lerp<float>(fov_far, fov_near, zoom_factor);
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// Determine aspect ratio
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float aspect_ratio = viewport[2] / viewport[3];
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// Determine clipping planes
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float clip_near = math::log_lerp<float>(near_clip_far, near_clip_near, zoom_factor);
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float clip_far = math::log_lerp<float>(far_clip_far, far_clip_near, zoom_factor);
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// Update camera projection
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camera->set_perspective(fov, aspect_ratio, clip_near, clip_far);
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}
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void camera_system::rotate(float angle)
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{
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set_azimuth(azimuth + angle);
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}
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void camera_system::tilt(float angle)
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{
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set_elevation(elevation + angle);
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}
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void camera_system::zoom(float factor)
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{
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set_zoom(std::max<float>(0.0f, std::min<float>(1.0f, zoom_factor + factor)));
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}
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void camera_system::set_camera(::camera* camera)
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{
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this->camera = camera;
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}
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void camera_system::set_viewport(const float4& viewport)
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{
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this->viewport = viewport;
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}
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void camera_system::set_azimuth(float angle)
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{
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azimuth = math::wrap_radians(angle);
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azimuth_rotation = math::angle_axis(azimuth, float3{0.0f, 1.0f, 0.0f});
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}
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void camera_system::set_elevation(float angle)
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{
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elevation = math::wrap_radians(angle);
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elevation_rotation = math::angle_axis(elevation, float3{-1.0f, 0.0f, 0.0f});
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}
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void camera_system::set_zoom(float factor)
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{
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this->zoom_factor = factor;
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}
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void camera_system::set_focal_distance(float distance_near, float distance_far)
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{
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focal_distance_near = distance_near;
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focal_distance_far = distance_far;
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}
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void camera_system::set_fov(float angle_near, float angle_far)
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{
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fov_near = angle_near;
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fov_far = angle_far;
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}
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void camera_system::set_clip_near(float distance_near, float distance_far)
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{
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near_clip_near = distance_near;
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near_clip_far = distance_far;
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}
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void camera_system::set_clip_far(float distance_near, float distance_far)
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{
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far_clip_near = distance_near;
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far_clip_far = distance_far;
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}
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void camera_system::handle_event(const mouse_moved_event& event)
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{
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mouse_position[0] = event.x;
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mouse_position[1] = event.y;
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}
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void camera_system::handle_event(const window_resized_event& event)
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{
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set_viewport({0.0f, 0.0f, static_cast<float>(event.w), static_cast<float>(event.h)});
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}
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