💿🐜 Antkeeper source code
https://antkeeper.com
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91 lines
2.8 KiB
91 lines
2.8 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 "snapping-system.hpp"
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#include "ecs/components/collision-component.hpp"
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#include "ecs/components/snap-component.hpp"
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#include "ecs/components/transform-component.hpp"
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#include "ecs/entity.hpp"
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#include "utility/fundamental-types.hpp"
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namespace ecs {
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snapping_system::snapping_system(ecs::registry& registry):
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entity_system(registry)
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{}
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void snapping_system::update(double t, double dt)
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{
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registry.view<transform_component, snap_component>().each(
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[&](ecs::entity entity, auto& snap_transform, auto& snap)
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{
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bool intersection = false;
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float a = std::numeric_limits<float>::infinity();
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float3 pick;
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geom::ray<float> snap_ray = snap.ray;
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if (snap.relative)
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{
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snap_ray.origin += snap_transform.local.translation;
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snap_ray.direction = snap_transform.local.rotation * snap_ray.direction;
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}
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this->registry.view<transform_component, collision_component>().each(
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[&](ecs::entity entity, auto& collision_transform, auto& collision)
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{
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// Transform ray into local space of collision component
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math::transform<float> inverse_transform = math::inverse(collision_transform.local);
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float3 origin = inverse_transform * snap_ray.origin;
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float3 direction = math::normalize(math::conjugate(collision_transform.local.rotation) * snap_ray.direction);
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geom::ray<float> transformed_ray = {origin, direction};
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// Broad phase AABB test
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auto aabb_result = geom::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 = snap_ray.extrapolate(a);
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}
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}
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});
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if (intersection)
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{
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snap_transform.local.translation = pick;
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snap_transform.warp = snap.warp;
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if (snap.autoremove)
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{
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this->registry.remove<snap_component>(entity);
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}
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}
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});
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}
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} // namespace ecs
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