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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 "tool-system.hpp"
- #include "game/components/collision-component.hpp"
- #include "game/components/tool-component.hpp"
- #include "game/components/transform-component.hpp"
- #include "scene/camera.hpp"
- #include "animation/orbit-cam.hpp"
- #include "geometry/mesh.hpp"
- #include "geometry/intersection.hpp"
- #include "math/math.hpp"
-
- using namespace ecs;
-
- tool_system::tool_system(entt::registry& registry):
- entity_system(registry),
- camera(nullptr),
- orbit_cam(orbit_cam),
- viewport{0, 0, 0, 0},
- mouse_position{0, 0},
- pick_enabled(true),
- was_pick_enabled(pick_enabled)
- {}
-
- void tool_system::update(double t, double dt)
- {
- if (!camera)
- return;
-
- float3 pick_near = camera->unproject({mouse_position[0], viewport[3] - mouse_position[1], 0.0f}, viewport);
- float3 pick_far = camera->unproject({mouse_position[0], viewport[3] - mouse_position[1], 1.0f}, viewport);
- float3 pick_origin = pick_near;
- float3 pick_direction = math::normalize(pick_far - pick_near);
- ray<float> picking_ray = {pick_near, pick_direction};
-
- float a = std::numeric_limits<float>::infinity();
- bool intersection = false;
- float3 pick;
-
- // Cast ray from cursor to collision components to find closest intersection
- registry.view<transform_component, collision_component>().each(
- [&](auto entity, auto& transform, auto& collision)
- {
- math::transform<float> inverse_transform = math::inverse(transform.transform);
- float3 origin = inverse_transform * pick_origin;
- float3 direction = math::normalize(math::conjugate(transform.transform.rotation) * pick_direction);
- ray<float> transformed_ray = {origin, direction};
-
- // Broad phase AABB test
- auto aabb_result = ray_aabb_intersection(transformed_ray, collision.bounds);
- if (!std::get<0>(aabb_result))
- {
- return;
- }
-
- // Narrow phase mesh test
- auto mesh_result = collision.mesh_accelerator.query_nearest(transformed_ray);
- if (mesh_result)
- {
- intersection = true;
- if (mesh_result->t < a)
- {
- a = mesh_result->t;
- pick = picking_ray.extrapolate(a);
- }
- }
- });
-
- const float3& camera_position = camera->get_translation();
- float3 pick_planar_position = float3{pick.x, 0, pick.z};
- float3 camera_planar_position = float3{camera_position.x, 0, camera_position.z};
-
- float pick_angle = 0.0f;
- float3 pick_planar_direction = math::normalize(pick_planar_position - camera_planar_position);
- float3 camera_planar_focal_point = float3{orbit_cam->get_focal_point().x, 0, orbit_cam->get_focal_point().z};
- float3 camera_planar_direction = math::normalize(camera_planar_focal_point - camera_planar_position);
- if (std::fabs(math::length_squared(camera_planar_direction - pick_planar_direction) > 0.0001f))
- {
- pick_angle = std::acos(math::dot(camera_planar_direction, pick_planar_direction));
- if (math::dot(math::cross(camera_planar_direction, pick_planar_direction), float3{0, 1, 0}) < 0.0f)
- pick_angle = -pick_angle;
- }
-
- // Move active tools to intersection location
- registry.view<tool_component, transform_component>().each(
- [&](auto entity, auto& tool, auto& transform)
- {
- /*
- if (registry.has<model_component>(entity))
- {
-
- }*/
-
- if (!tool.active)
- return;
-
- if (intersection)
- {
- transform.transform.translation = pick + float3{0, tool.hover_distance, 0};
- }
-
- //math::quaternion<float> rotation = math::angle_axis(orbit_cam->get_azimuth() + pick_angle, float3{0, 1, 0});
- //transform.transform.rotation = rotation;
- });
-
- was_pick_enabled = pick_enabled;
- }
-
- void tool_system::set_camera(const ::camera* camera)
- {
- this->camera = camera;
- }
-
- void tool_system::set_orbit_cam(const ::orbit_cam* orbit_cam)
- {
- this->orbit_cam = orbit_cam;
- }
-
- void tool_system::set_viewport(const float4& viewport)
- {
- this->viewport = viewport;
- }
-
- void tool_system::set_pick(bool enabled)
- {
- pick_enabled = enabled;
- }
-
- void tool_system::handle_event(const mouse_moved_event& event)
- {
- if (pick_enabled && was_pick_enabled)
- {
- mouse_position[0] = event.x;
- mouse_position[1] = event.y;
- }
- }
-
- void tool_system::handle_event(const window_resized_event& event)
- {
- set_viewport({0.0f, 0.0f, static_cast<float>(event.w), static_cast<float>(event.h)});
- }
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