76 lines
3.1 KiB
C++
76 lines
3.1 KiB
C++
/********************************************************************************
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* ReactPhysics3D physics library, http://www.reactphysics3d.com *
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* Copyright (c) 2010-2018 Daniel Chappuis *
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*********************************************************************************
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* *
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* This software is provided 'as-is', without any express or implied warranty. *
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* In no event will the authors be held liable for any damages arising from the *
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* use of this software. *
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* *
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* Permission is granted to anyone to use this software for any purpose, *
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* including commercial applications, and to alter it and redistribute it *
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* freely, subject to the following restrictions: *
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* *
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* 1. The origin of this software must not be misrepresented; you must not claim *
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* that you wrote the original software. If you use this software in a *
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* product, an acknowledgment in the product documentation would be *
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* appreciated but is not required. *
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* *
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* 2. Altered source versions must be plainly marked as such, and must not be *
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* misrepresented as being the original software. *
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* *
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* 3. This notice may not be removed or altered from any source distribution. *
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* *
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********************************************************************************/
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// Libraries
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#include "EntityManager.h"
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#include "Entity.h"
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using namespace reactphysics3d;
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// Constructor
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EntityManager::EntityManager(MemoryAllocator& allocator)
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:mGenerations(allocator), mFreeIndices(allocator) {
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}
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// Create a new entity
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Entity EntityManager::createEntity() {
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uint32 index;
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// If there are already enough free indices to start using them
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if (mFreeIndices.size() > Entity::MINIMUM_FREE_INDICES) {
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// Recycle an index from the free indices
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index = mFreeIndices.getFront();
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mFreeIndices.popFront();
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}
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else {
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// We start at generation 0
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mGenerations.add(0);
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// Create a new indice
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index = static_cast<uint32>(mGenerations.size()) - 1;
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assert(index < (1 << Entity::ENTITY_INDEX_BITS));
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}
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// Return a new entity
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return Entity(index, mGenerations[index]);
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}
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// Destroy an entity
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void EntityManager::destroyEntity(Entity entity) {
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const uint32 index = entity.getIndex();
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// Increment the generation of this index
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mGenerations[index]++;
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// Add the index into the deque of free indices
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mFreeIndices.addBack(index);
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}
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