💿🐜 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.
216 lines
6.4 KiB
216 lines
6.4 KiB
/*
|
|
* 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 "camera-system.hpp"
|
|
#include "game/components/camera-subject-component.hpp"
|
|
#include "game/components/transform-component.hpp"
|
|
#include "animation/spring.hpp"
|
|
#include "scene/camera.hpp"
|
|
#include "math/math.hpp"
|
|
#include <cmath>
|
|
#include <iostream>
|
|
|
|
using namespace ecs;
|
|
|
|
camera_system::camera_system(entt::registry& registry):
|
|
entity_system(registry),
|
|
camera(nullptr),
|
|
viewport{0, 0, 0, 0},
|
|
mouse_position{0, 0}
|
|
{
|
|
// Init azimuth spring constraint
|
|
azimuth_spring.v = 0.0f;
|
|
azimuth_spring.z = 1.0f;
|
|
azimuth_spring.w = 2.0f * math::two_pi<float>;
|
|
|
|
// Init elevation spring constraint
|
|
elevation_spring.v = 0.0f;
|
|
elevation_spring.z = 1.0f;
|
|
elevation_spring.w = 2.0f * math::two_pi<float>;
|
|
|
|
// Init focal distance spring constraint
|
|
focal_distance_spring.v = 0.0f;
|
|
focal_distance_spring.z = 1.0f;
|
|
focal_distance_spring.w = 5.0f * math::two_pi<float>;
|
|
|
|
// Init fov spring constraint
|
|
fov_spring.v = 0.0f;
|
|
fov_spring.z = 1.0f;
|
|
fov_spring.w = 5.0f * math::two_pi<float>;
|
|
}
|
|
|
|
void camera_system::update(double t, double dt)
|
|
{
|
|
if (!camera)
|
|
return;
|
|
|
|
// Determine target focal point
|
|
int subject_count = 0;
|
|
float3 target_focal_point = {0, 0, 0};
|
|
registry.view<camera_subject_component, transform_component>().each(
|
|
[&](auto entity, auto& subject, auto& transform)
|
|
{
|
|
target_focal_point += transform.transform.translation;
|
|
++subject_count;
|
|
});
|
|
if (subject_count > 1)
|
|
target_focal_point /= static_cast<float>(subject_count);
|
|
|
|
// Get source transform
|
|
transform_type source_transform = camera->get_transform();
|
|
|
|
// Solve azimuth spring
|
|
float2 xz_direction = math::normalize(math::swizzle<0, 2>(target_focal_point) - math::swizzle<0, 2>(source_transform.translation));
|
|
azimuth_spring.x0 = math::wrap_radians(std::atan2(-xz_direction.y, xz_direction.x) - math::half_pi<float>);
|
|
azimuth_spring.x1 = azimuth_spring.x0 + math::wrap_radians(azimuth_spring.x1 - azimuth_spring.x0);
|
|
solve_spring_constraint<float, float>(azimuth_spring, dt);
|
|
|
|
// Sovle elevation spring
|
|
elevation_spring.x0 = elevation;
|
|
elevation_spring.x1 = elevation_spring.x0 + math::wrap_radians(elevation_spring.x1 - elevation_spring.x0);
|
|
solve_spring_constraint<float, float>(elevation_spring, dt);
|
|
|
|
// Solve focal distance spring
|
|
focal_distance_spring.x0 = math::length(source_transform.translation - target_focal_point);
|
|
solve_spring_constraint<float, float>(focal_distance_spring, dt);
|
|
|
|
// Solve FOV spring
|
|
fov_spring.x0 = camera->get_fov();
|
|
solve_spring_constraint<float, float>(fov_spring, dt);
|
|
|
|
// Determine camera rotation
|
|
quaternion_type smooth_azimuth_rotation = math::angle_axis(azimuth_spring.x0, float3{0.0f, 1.0f, 0.0f});
|
|
quaternion_type smooth_elevation_rotation = math::angle_axis(elevation_spring.x0, float3{-1.0f, 0.0f, 0.0f});
|
|
quaternion_type smooth_rotation = math::normalize(smooth_azimuth_rotation * smooth_elevation_rotation);
|
|
|
|
// Determine camera view point
|
|
float3 smooth_view_point = target_focal_point + smooth_rotation * float3{0.0f, 0.0f, focal_distance_spring.x0};
|
|
|
|
// Update camera transform
|
|
transform_type smooth_transform;
|
|
smooth_transform.translation = smooth_view_point;
|
|
smooth_transform.rotation = smooth_rotation;
|
|
smooth_transform.scale = source_transform.scale;
|
|
camera->set_transform(smooth_transform);
|
|
|
|
// Determine aspect ratio
|
|
float aspect_ratio = viewport[2] / viewport[3];
|
|
|
|
// Determine clipping planes
|
|
float clip_near = math::log_lerp<float>(near_clip_far, near_clip_near, zoom_factor);
|
|
float clip_far = math::log_lerp<float>(far_clip_far, far_clip_near, zoom_factor);
|
|
|
|
// Update camera projection
|
|
camera->set_perspective(fov_spring.x0, aspect_ratio, clip_near, clip_far);
|
|
}
|
|
|
|
void camera_system::rotate(float angle)
|
|
{
|
|
set_azimuth(azimuth + angle);
|
|
}
|
|
|
|
void camera_system::tilt(float angle)
|
|
{
|
|
set_elevation(elevation + angle);
|
|
}
|
|
|
|
void camera_system::zoom(float factor)
|
|
{
|
|
set_zoom(zoom_factor + factor);
|
|
}
|
|
|
|
void camera_system::set_camera(::camera* camera)
|
|
{
|
|
this->camera = camera;
|
|
}
|
|
|
|
void camera_system::set_viewport(const float4& viewport)
|
|
{
|
|
this->viewport = viewport;
|
|
}
|
|
|
|
void camera_system::set_azimuth(float angle)
|
|
{
|
|
azimuth = math::wrap_radians(angle);
|
|
azimuth_rotation = math::angle_axis(azimuth, float3{0.0f, 1.0f, 0.0f});
|
|
azimuth_spring.x1 = azimuth;
|
|
}
|
|
|
|
void camera_system::set_elevation(float angle)
|
|
{
|
|
elevation = math::wrap_radians(angle);
|
|
elevation_rotation = math::angle_axis(elevation, float3{-1.0f, 0.0f, 0.0f});
|
|
elevation_spring.x1 = elevation;
|
|
}
|
|
|
|
void camera_system::set_zoom(float factor)
|
|
{
|
|
this->zoom_factor = std::max<float>(0.0f, std::min<float>(1.0f, factor));
|
|
update_focal_distance();
|
|
update_fov();
|
|
}
|
|
|
|
void camera_system::set_focal_distance(float distance_near, float distance_far)
|
|
{
|
|
focal_distance_near = distance_near;
|
|
focal_distance_far = distance_far;
|
|
update_focal_distance();
|
|
}
|
|
|
|
void camera_system::set_fov(float angle_near, float angle_far)
|
|
{
|
|
fov_near = angle_near;
|
|
fov_far = angle_far;
|
|
update_fov();
|
|
}
|
|
|
|
void camera_system::set_clip_near(float distance_near, float distance_far)
|
|
{
|
|
near_clip_near = distance_near;
|
|
near_clip_far = distance_far;
|
|
}
|
|
|
|
void camera_system::set_clip_far(float distance_near, float distance_far)
|
|
{
|
|
far_clip_near = distance_near;
|
|
far_clip_far = distance_far;
|
|
}
|
|
|
|
void camera_system::handle_event(const mouse_moved_event& event)
|
|
{
|
|
mouse_position[0] = event.x;
|
|
mouse_position[1] = event.y;
|
|
}
|
|
|
|
void camera_system::handle_event(const window_resized_event& event)
|
|
{
|
|
set_viewport({0.0f, 0.0f, static_cast<float>(event.w), static_cast<float>(event.h)});
|
|
}
|
|
|
|
void camera_system::update_focal_distance()
|
|
{
|
|
focal_distance = math::log_lerp<float>(focal_distance_far, focal_distance_near, zoom_factor);
|
|
focal_distance_spring.x1 = focal_distance;
|
|
}
|
|
|
|
void camera_system::update_fov()
|
|
{
|
|
fov = math::log_lerp<float>(fov_far, fov_near, zoom_factor);
|
|
fov_spring.x1 = fov;
|
|
}
|