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- /*
- * Copyright (C) 2017-2019 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 "collision-system.hpp"
-
- CollisionSystem::CollisionSystem(ComponentManager* componentManager):
- System(componentManager),
- entityGroup(componentManager)
- {}
-
- CollisionSystem::~CollisionSystem()
- {}
-
- void CollisionSystem::update(float t, float dt)
- {
- auto members = entityGroup.getMembers();
-
- // INEFFICIENT! Currently done twice (A vs B, then B vs A)
- // Also no octrees or other structure
- for (const CollisionEntityGroup::Member* memberA: *members)
- {
- CollisionComponent* collisionA = std::get<0>(memberA->components);
- TransformComponent* transformA = std::get<1>(memberA->components);
-
- // Clear previous collisions
- collisionA->collisions.clear();
-
- for (const CollisionEntityGroup::Member* memberB: *members)
- {
- if (memberA == memberB)
- {
- continue;
- }
-
- CollisionComponent* collisionB = std::get<0>(memberB->components);
- TransformComponent* transformB = std::get<1>(memberB->components);
-
- Vector3 difference = transformA->transform.translation - transformB->transform.translation;
- float distanceSquared = glm::length2(difference);
- float collisionRadius = collisionA->radius + collisionB->radius;
-
- if (distanceSquared <= collisionRadius * collisionRadius)
- {
- collisionA->collisions.push_back(memberB->entity);
- }
- }
- }
- }
-
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