💿🐜 Antkeeper source code
https://antkeeper.com
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144 lines
4.5 KiB
144 lines
4.5 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 "tool-system.hpp"
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#include "game/components/collision-component.hpp"
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#include "game/components/tool-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 "orbit-cam.hpp"
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#include "geometry/mesh.hpp"
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#include "geometry/intersection.hpp"
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#include "math/math.hpp"
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using namespace ecs;
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tool_system::tool_system(entt::registry& registry):
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entity_system(registry),
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camera(nullptr),
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orbit_cam(orbit_cam),
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viewport{0, 0, 0, 0},
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mouse_position{0, 0},
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pick_enabled(true)
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{}
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void tool_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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float3 pick_near = camera->unproject({mouse_position[0], viewport[3] - mouse_position[1], 0.0f}, viewport);
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float3 pick_far = camera->unproject({mouse_position[0], viewport[3] - mouse_position[1], 1.0f}, viewport);
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float3 pick_origin = pick_near;
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float3 pick_direction = math::normalize(pick_far - pick_near);
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ray<float> picking_ray = {pick_near, pick_direction};
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float a = std::numeric_limits<float>::infinity();
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bool intersection = false;
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float3 pick;
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// Cast ray from cursor to collision components to find closest intersection
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registry.view<transform_component, collision_component>().each(
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[&](auto entity, auto& transform, auto& collision)
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{
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math::transform<float> inverse_transform = math::inverse(transform.transform);
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float3 origin = inverse_transform * pick_origin;
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float3 direction = math::normalize(math::conjugate(transform.transform.rotation) * pick_direction);
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ray<float> transformed_ray = {origin, direction};
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// Broad phase AABB test
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auto aabb_result = ray_aabb_intersection(transformed_ray, collision.bounds);
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if (!std::get<0>(aabb_result))
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{
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return;
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}
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// Narrow phase mesh test
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auto mesh_result = collision.mesh_accelerator.query_nearest(transformed_ray);
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if (mesh_result)
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{
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intersection = true;
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if (mesh_result->t < a)
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{
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a = mesh_result->t;
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pick = picking_ray.extrapolate(a);
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}
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}
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});
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const float3& camera_position = camera->get_translation();
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float3 pick_planar_position = float3{pick.x, 0, pick.z};
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float3 camera_planar_position = float3{camera_position.x, 0, camera_position.z};
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float pick_angle = 0.0f;
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float3 pick_planar_direction = math::normalize(pick_planar_position - camera_planar_position);
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float3 camera_planar_focal_point = float3{orbit_cam->get_focal_point().x, 0, orbit_cam->get_focal_point().z};
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float3 camera_planar_direction = math::normalize(camera_planar_focal_point - camera_planar_position);
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if (std::fabs(math::length_squared(camera_planar_direction - pick_planar_direction) > 0.0001f))
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{
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pick_angle = std::acos(math::dot(camera_planar_direction, pick_planar_direction));
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if (math::dot(math::cross(camera_planar_direction, pick_planar_direction), float3{0, 1, 0}) < 0.0f)
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pick_angle = -pick_angle;
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}
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// Move active tools to intersection location
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registry.view<tool_component, transform_component>().each(
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[&](auto entity, auto& tool, auto& transform)
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{
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if (!tool.active)
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return;
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if (intersection)
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{
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transform.transform.translation = pick;
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}
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math::quaternion<float> rotation = math::angle_axis(orbit_cam->get_azimuth() + pick_angle, float3{0, 1, 0});
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transform.transform.rotation = rotation;
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});
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}
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void tool_system::set_camera(const ::camera* camera)
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{
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this->camera = camera;
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}
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void tool_system::set_orbit_cam(const ::orbit_cam* orbit_cam)
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{
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this->orbit_cam = orbit_cam;
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}
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void tool_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 tool_system::set_pick(bool enabled)
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{
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pick_enabled = enabled;
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}
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void tool_system::handle_event(const mouse_moved_event& event)
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{
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if (pick_enabled)
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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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}
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