💿🐜 Antkeeper source code
https://antkeeper.com
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224 lines
6.3 KiB
224 lines
6.3 KiB
/*
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* Copyright (C) 2021 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 "animation/orbit-cam.hpp"
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#include "scene/camera.hpp"
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#include "math/math.hpp"
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#include <algorithm>
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#include <cmath>
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#include <limits>
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#include <iostream>
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orbit_cam::orbit_cam():
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azimuth_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()}),
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elevation_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()}),
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focal_distance_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()}),
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fov_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()}),
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clip_near_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()}),
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clip_far_limits({-std::numeric_limits<float>::infinity(), std::numeric_limits<float>::infinity()})
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{
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// Make all springs critically-damped
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focal_point_spring.z = 1.0f;
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azimuth_spring.z = 1.0f;
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elevation_spring.z = 1.0f;
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zoom_spring.z = 1.0f;
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// Init spring oscillation frequencies to 1 rad/s
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focal_point_spring.w = math::two_pi<float>;
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azimuth_spring.w = math::two_pi<float>;
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elevation_spring.w = math::two_pi<float>;
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zoom_spring.w = math::two_pi<float>;
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// Zero spring values and velocities
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focal_point_spring.x1 = {0.0f, 0.0f, 0.0f};
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azimuth_spring.x1 = 0.0f;
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elevation_spring.x1 = 0.0f;
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zoom_spring.x1 = 0.0f;
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reset_springs();
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}
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orbit_cam::~orbit_cam()
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{}
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void orbit_cam::update(float dt)
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{
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if (!get_camera())
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{
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return;
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}
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// Solve springs
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solve_numeric_spring<float3, float>(focal_point_spring, dt);
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solve_numeric_spring<float, float>(azimuth_spring, dt);
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solve_numeric_spring<float, float>(elevation_spring, dt);
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solve_numeric_spring<float, float>(zoom_spring, dt);
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// Calculate zoom-dependent variables
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float focal_distance = math::log_lerp<float>(focal_distance_limits[1], focal_distance_limits[0], zoom_spring.x0);
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float fov = math::log_lerp<float>(fov_limits[1], fov_limits[0], zoom_spring.x0);
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float clip_near = math::log_lerp<float>(clip_near_limits[1], clip_near_limits[0], zoom_spring.x0);
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float clip_far = math::log_lerp<float>(clip_far_limits[1], clip_far_limits[0], zoom_spring.x0);
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// Calculate camera transform
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transform_type transform = math::identity_transform<float>;
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// Determine rotation
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azimuth_rotation = math::angle_axis(azimuth_spring.x0, float3{0.0f, 1.0f, 0.0f});
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elevation_rotation = math::angle_axis(elevation_spring.x0, float3{-1.0f, 0.0f, 0.0f});
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transform.rotation = math::normalize(azimuth_rotation * elevation_rotation);
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// Determine translation
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transform.translation = focal_point_spring.x0 + transform.rotation * float3{0.0f, 0.0f, focal_distance};
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// Update camera transform
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update_transform(transform);
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// Update camera projection
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update_projection(fov, aspect_ratio, clip_near, clip_far);
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}
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void orbit_cam::move(const float3& translation)
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{
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set_target_focal_point(focal_point_spring.x1 + translation);
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}
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void orbit_cam::pan(float angle)
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{
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set_target_azimuth(azimuth_spring.x1 + angle);
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}
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void orbit_cam::tilt(float angle)
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{
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set_target_elevation(elevation_spring.x1 + angle);
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}
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void orbit_cam::zoom(float factor)
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{
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set_target_zoom(zoom_spring.x1 + factor);
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}
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void orbit_cam::reset_springs()
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{
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// Reset values
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focal_point_spring.x0 = focal_point_spring.x1;
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azimuth_spring.x0 = azimuth_spring.x1;
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elevation_spring.x0 = elevation_spring.x1;
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zoom_spring.x0 = zoom_spring.x1;
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// Reset velocities
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focal_point_spring.v = {0.0f, 0.0f, 0.0f};
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azimuth_spring.v = 0.0f;
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elevation_spring.v = 0.0f;
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zoom_spring.v = 0.0f;
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}
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void orbit_cam::set_aspect_ratio(float ratio)
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{
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aspect_ratio = ratio;
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}
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void orbit_cam::set_focal_point(const float3& point)
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{
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focal_point_spring.x0 = point;
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}
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void orbit_cam::set_azimuth(float angle)
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{
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azimuth_spring.x0 = std::max<float>(azimuth_limits[0], std::min<float>(azimuth_limits[1], angle));
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}
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void orbit_cam::set_elevation(float angle)
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{
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elevation_spring.x0 = std::max<float>(elevation_limits[0], std::min<float>(elevation_limits[1], angle));
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}
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void orbit_cam::set_zoom(float factor)
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{
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zoom_spring.x0 = std::max<float>(0.0f, std::min<float>(1.0f, factor));
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}
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void orbit_cam::set_target_focal_point(const float3& point)
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{
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focal_point_spring.x1 = point;
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}
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void orbit_cam::set_target_azimuth(float angle)
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{
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azimuth_spring.x1 = std::max<float>(azimuth_limits[0], std::min<float>(azimuth_limits[1], angle));
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}
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void orbit_cam::set_target_elevation(float angle)
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{
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elevation_spring.x1 = std::max<float>(elevation_limits[0], std::min<float>(elevation_limits[1], angle));
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}
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void orbit_cam::set_target_zoom(float factor)
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{
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zoom_spring.x1 = std::max<float>(0.0f, std::min<float>(1.0f, factor));
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}
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void orbit_cam::set_azimuth_limits(const std::array<float, 2>& limits)
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{
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azimuth_limits = limits;
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}
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void orbit_cam::set_elevation_limits(const std::array<float, 2>& limits)
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{
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elevation_limits = limits;
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}
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void orbit_cam::set_focal_distance_limits(const std::array<float, 2>& limits)
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{
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focal_distance_limits = limits;
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}
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void orbit_cam::set_fov_limits(const std::array<float, 2>& limits)
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{
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fov_limits = limits;
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}
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void orbit_cam::set_clip_near_limits(const std::array<float, 2>& limits)
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{
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clip_near_limits = limits;
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}
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void orbit_cam::set_clip_far_limits(const std::array<float, 2>& limits)
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{
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clip_far_limits = limits;
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}
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void orbit_cam::set_focal_point_oscillation(float frequency)
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{
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focal_point_spring.w = frequency;
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}
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void orbit_cam::set_azimuth_oscillation(float frequency)
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{
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azimuth_spring.w = frequency;
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}
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void orbit_cam::set_elevation_oscillation(float frequency)
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{
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elevation_spring.w = frequency;
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}
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void orbit_cam::set_zoom_oscillation(float frequency)
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{
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zoom_spring.w = frequency;
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}
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