120 lines
3.0 KiB
C++
120 lines
3.0 KiB
C++
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/*
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* Copyright (c) 2006-2009 Erin Catto http://www.box2d.org
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*
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* This software is provided 'as-is', without any express or implied
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* warranty. In no event will the authors be held liable for any damages
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* arising from the use of this software.
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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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* 1. The origin of this software must not be misrepresented; you must not
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* claim that you wrote the original software. If you use this software
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* in a product, an acknowledgment in the product documentation would be
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* appreciated but is not required.
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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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* 3. This notice may not be removed or altered from any source distribution.
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*/
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#include "Box2D/Collision/b2BroadPhase.h"
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b2BroadPhase::b2BroadPhase()
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{
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m_proxyCount = 0;
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m_pairCapacity = 16;
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m_pairCount = 0;
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m_pairBuffer = (b2Pair*)b2Alloc(m_pairCapacity * sizeof(b2Pair));
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m_moveCapacity = 16;
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m_moveCount = 0;
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m_moveBuffer = (int32*)b2Alloc(m_moveCapacity * sizeof(int32));
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}
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b2BroadPhase::~b2BroadPhase()
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{
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b2Free(m_moveBuffer);
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b2Free(m_pairBuffer);
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}
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int32 b2BroadPhase::CreateProxy(const b2AABB& aabb, void* userData)
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{
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int32 proxyId = m_tree.CreateProxy(aabb, userData);
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++m_proxyCount;
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BufferMove(proxyId);
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return proxyId;
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}
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void b2BroadPhase::DestroyProxy(int32 proxyId)
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{
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UnBufferMove(proxyId);
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--m_proxyCount;
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m_tree.DestroyProxy(proxyId);
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}
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void b2BroadPhase::MoveProxy(int32 proxyId, const b2AABB& aabb, const b2Vec2& displacement)
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{
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bool buffer = m_tree.MoveProxy(proxyId, aabb, displacement);
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if (buffer)
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{
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BufferMove(proxyId);
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}
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}
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void b2BroadPhase::TouchProxy(int32 proxyId)
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{
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BufferMove(proxyId);
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}
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void b2BroadPhase::BufferMove(int32 proxyId)
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{
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if (m_moveCount == m_moveCapacity)
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{
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int32* oldBuffer = m_moveBuffer;
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m_moveCapacity *= 2;
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m_moveBuffer = (int32*)b2Alloc(m_moveCapacity * sizeof(int32));
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memcpy(m_moveBuffer, oldBuffer, m_moveCount * sizeof(int32));
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b2Free(oldBuffer);
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}
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m_moveBuffer[m_moveCount] = proxyId;
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++m_moveCount;
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}
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void b2BroadPhase::UnBufferMove(int32 proxyId)
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{
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for (int32 i = 0; i < m_moveCount; ++i)
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{
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if (m_moveBuffer[i] == proxyId)
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{
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m_moveBuffer[i] = e_nullProxy;
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}
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}
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}
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// This is called from b2DynamicTree::Query when we are gathering pairs.
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bool b2BroadPhase::QueryCallback(int32 proxyId)
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{
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// A proxy cannot form a pair with itself.
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if (proxyId == m_queryProxyId)
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{
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return true;
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}
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// Grow the pair buffer as needed.
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if (m_pairCount == m_pairCapacity)
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{
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b2Pair* oldBuffer = m_pairBuffer;
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m_pairCapacity *= 2;
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m_pairBuffer = (b2Pair*)b2Alloc(m_pairCapacity * sizeof(b2Pair));
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memcpy(m_pairBuffer, oldBuffer, m_pairCount * sizeof(b2Pair));
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b2Free(oldBuffer);
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}
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m_pairBuffer[m_pairCount].proxyIdA = b2Min(proxyId, m_queryProxyId);
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m_pairBuffer[m_pairCount].proxyIdB = b2Max(proxyId, m_queryProxyId);
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++m_pairCount;
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return true;
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}
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