💿🐜 Antkeeper source code
https://antkeeper.com
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96 lines
2.6 KiB
96 lines
2.6 KiB
/*
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* Copyright (C) 2017-2019 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 "steering-system.hpp"
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SteeringSystem::SteeringSystem(ComponentManager* componentManager):
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System(componentManager),
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boids(componentManager)
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{
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boids.addGroupObserver(this);
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}
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SteeringSystem::~SteeringSystem()
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{}
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void SteeringSystem::update(float t, float dt)
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{
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auto members = boids.getMembers();
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for (const SteeringGroup::Member* member: *members)
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{
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SteeringComponent* steering = std::get<0>(member->components);
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// Initialize summed steering force
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steering->force = Vector3(0.0f);
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steering->speed = 0.0f;
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float speedSquared = 0.0f;
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float maxSpeedSquared = steering->maxSpeed * steering->maxSpeed;
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bool truncated = false;
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if (steering->behaviorCount > 0)
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{
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// Sort steering beaviors by priority
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std::sort(steering->behaviors, steering->behaviors + steering->behaviorCount,
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[](const SteeringBehavior& a, const SteeringBehavior& b) -> bool
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{
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return (a.priority >= b.priority);
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}
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);
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}
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// Evaluate steering forces in order
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for (std::size_t i = 0; i < steering->behaviorCount; ++i)
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{
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const SteeringBehavior& behavior = steering->behaviors[i];
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// Skip zero-weighted steering behaviors
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if (behavior.weight == 0.0f)
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{
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continue;
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}
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// Add weighted steering behavior force
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steering->force += behavior.function() * behavior.weight;
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// Limit speed
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speedSquared = glm::length2(steering->force);
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if (speedSquared >= maxSpeedSquared)
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{
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steering->force *= (1.0f / std::sqrt(speedSquared)) * steering->maxSpeed;
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steering->speed = steering->maxSpeed;
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truncated = true;
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break;
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}
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}
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if (!truncated)
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{
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steering->speed = std::sqrt(speedSquared);
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}
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}
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}
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void SteeringSystem::memberRegistered(const SteeringGroup::Member* member)
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{}
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void SteeringSystem::memberUnregistered(const SteeringGroup::Member* member)
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{}
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