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// MIT License
// Copyright (c) 2019 Erin Catto
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
// AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
// LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
// OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
// SOFTWARE.
#include "box2d/b2_broad_phase.h"
#include <string.h>
b2BroadPhase::b2BroadPhase()
{
m_proxyCount = 0;
m_pairCapacity = 16;
m_pairCount = 0;
m_pairBuffer = (b2Pair*)b2Alloc(m_pairCapacity * sizeof(b2Pair));
m_moveCapacity = 16;
m_moveCount = 0;
m_moveBuffer = (int32*)b2Alloc(m_moveCapacity * sizeof(int32));
}
b2BroadPhase::~b2BroadPhase()
{
b2Free(m_moveBuffer);
b2Free(m_pairBuffer);
}
int32 b2BroadPhase::CreateProxy(const b2AABB& aabb, void* userData)
{
int32 proxyId = m_tree.CreateProxy(aabb, userData);
++m_proxyCount;
BufferMove(proxyId);
return proxyId;
}
void b2BroadPhase::DestroyProxy(int32 proxyId)
{
UnBufferMove(proxyId);
--m_proxyCount;
m_tree.DestroyProxy(proxyId);
}
void b2BroadPhase::MoveProxy(int32 proxyId, const b2AABB& aabb, const b2Vec2& displacement)
{
bool buffer = m_tree.MoveProxy(proxyId, aabb, displacement);
if (buffer)
{
BufferMove(proxyId);
}
}
void b2BroadPhase::TouchProxy(int32 proxyId)
{
BufferMove(proxyId);
}
void b2BroadPhase::BufferMove(int32 proxyId)
{
if (m_moveCount == m_moveCapacity)
{
int32* oldBuffer = m_moveBuffer;
m_moveCapacity *= 2;
m_moveBuffer = (int32*)b2Alloc(m_moveCapacity * sizeof(int32));
memcpy(m_moveBuffer, oldBuffer, m_moveCount * sizeof(int32));
b2Free(oldBuffer);
}
m_moveBuffer[m_moveCount] = proxyId;
++m_moveCount;
}
void b2BroadPhase::UnBufferMove(int32 proxyId)
{
for (int32 i = 0; i < m_moveCount; ++i)
{
if (m_moveBuffer[i] == proxyId)
{
m_moveBuffer[i] = e_nullProxy;
}
}
}
// This is called from b2DynamicTree::Query when we are gathering pairs.
bool b2BroadPhase::QueryCallback(int32 proxyId)
{
// A proxy cannot form a pair with itself.
if (proxyId == m_queryProxyId)
{
return true;
}
const bool moved = m_tree.WasMoved(proxyId);
if (moved && proxyId > m_queryProxyId)
{
// Both proxies are moving. Avoid duplicate pairs.
return true;
}
// Grow the pair buffer as needed.
if (m_pairCount == m_pairCapacity)
{
b2Pair* oldBuffer = m_pairBuffer;
m_pairCapacity = m_pairCapacity + (m_pairCapacity >> 1);
m_pairBuffer = (b2Pair*)b2Alloc(m_pairCapacity * sizeof(b2Pair));
memcpy(m_pairBuffer, oldBuffer, m_pairCount * sizeof(b2Pair));
b2Free(oldBuffer);
}
m_pairBuffer[m_pairCount].proxyIdA = b2Min(proxyId, m_queryProxyId);
m_pairBuffer[m_pairCount].proxyIdB = b2Max(proxyId, m_queryProxyId);
++m_pairCount;
return true;
}
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