diff options
author | chai <chaifix@163.com> | 2019-03-19 23:06:27 +0800 |
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committer | chai <chaifix@163.com> | 2019-03-19 23:06:27 +0800 |
commit | 1497dccd63a84b7ee2b229b1ad9c5c02718f2a78 (patch) | |
tree | f8d1bff50da13e126d08c7345653e002e293202d /Source/3rdParty/Box2D/Collision/b2DynamicTree.h | |
parent | 5e2a973516e0729b225da9de0b03015dc5854ac4 (diff) |
*rename
Diffstat (limited to 'Source/3rdParty/Box2D/Collision/b2DynamicTree.h')
-rw-r--r-- | Source/3rdParty/Box2D/Collision/b2DynamicTree.h | 289 |
1 files changed, 0 insertions, 289 deletions
diff --git a/Source/3rdParty/Box2D/Collision/b2DynamicTree.h b/Source/3rdParty/Box2D/Collision/b2DynamicTree.h deleted file mode 100644 index e52b44b..0000000 --- a/Source/3rdParty/Box2D/Collision/b2DynamicTree.h +++ /dev/null @@ -1,289 +0,0 @@ -/* -* Copyright (c) 2009 Erin Catto http://www.box2d.org -* -* This software is provided 'as-is', without any express or implied -* warranty. In no event will the authors be held liable for any damages -* arising from the use of this software. -* Permission is granted to anyone to use this software for any purpose, -* including commercial applications, and to alter it and redistribute it -* freely, subject to the following restrictions: -* 1. The origin of this software must not be misrepresented; you must not -* claim that you wrote the original software. If you use this software -* in a product, an acknowledgment in the product documentation would be -* appreciated but is not required. -* 2. Altered source versions must be plainly marked as such, and must not be -* misrepresented as being the original software. -* 3. This notice may not be removed or altered from any source distribution. -*/ - -#ifndef B2_DYNAMIC_TREE_H -#define B2_DYNAMIC_TREE_H - -#include "Box2D/Collision/b2Collision.h" -#include "Box2D/Common/b2GrowableStack.h" - -#define b2_nullNode (-1) - -/// A node in the dynamic tree. The client does not interact with this directly. -struct b2TreeNode -{ - bool IsLeaf() const - { - return child1 == b2_nullNode; - } - - /// Enlarged AABB - b2AABB aabb; - - void* userData; - - union - { - int32 parent; - int32 next; - }; - - int32 child1; - int32 child2; - - // leaf = 0, free node = -1 - int32 height; -}; - -/// A dynamic AABB tree broad-phase, inspired by Nathanael Presson's btDbvt. -/// A dynamic tree arranges data in a binary tree to accelerate -/// queries such as volume queries and ray casts. Leafs are proxies -/// with an AABB. In the tree we expand the proxy AABB by b2_fatAABBFactor -/// so that the proxy AABB is bigger than the client object. This allows the client -/// object to move by small amounts without triggering a tree update. -/// -/// Nodes are pooled and relocatable, so we use node indices rather than pointers. -class b2DynamicTree -{ -public: - /// Constructing the tree initializes the node pool. - b2DynamicTree(); - - /// Destroy the tree, freeing the node pool. - ~b2DynamicTree(); - - /// Create a proxy. Provide a tight fitting AABB and a userData pointer. - int32 CreateProxy(const b2AABB& aabb, void* userData); - - /// Destroy a proxy. This asserts if the id is invalid. - void DestroyProxy(int32 proxyId); - - /// Move a proxy with a swepted AABB. If the proxy has moved outside of its fattened AABB, - /// then the proxy is removed from the tree and re-inserted. Otherwise - /// the function returns immediately. - /// @return true if the proxy was re-inserted. - bool MoveProxy(int32 proxyId, const b2AABB& aabb1, const b2Vec2& displacement); - - /// Get proxy user data. - /// @return the proxy user data or 0 if the id is invalid. - void* GetUserData(int32 proxyId) const; - - /// Get the fat AABB for a proxy. - const b2AABB& GetFatAABB(int32 proxyId) const; - - /// Query an AABB for overlapping proxies. The callback class - /// is called for each proxy that overlaps the supplied AABB. - template <typename T> - void Query(T* callback, const b2AABB& aabb) const; - - /// Ray-cast against the proxies in the tree. This relies on the callback - /// to perform a exact ray-cast in the case were the proxy contains a shape. - /// The callback also performs the any collision filtering. This has performance - /// roughly equal to k * log(n), where k is the number of collisions and n is the - /// number of proxies in the tree. - /// @param input the ray-cast input data. The ray extends from p1 to p1 + maxFraction * (p2 - p1). - /// @param callback a callback class that is called for each proxy that is hit by the ray. - template <typename T> - void RayCast(T* callback, const b2RayCastInput& input) const; - - /// Validate this tree. For testing. - void Validate() const; - - /// Compute the height of the binary tree in O(N) time. Should not be - /// called often. - int32 GetHeight() const; - - /// Get the maximum balance of an node in the tree. The balance is the difference - /// in height of the two children of a node. - int32 GetMaxBalance() const; - - /// Get the ratio of the sum of the node areas to the root area. - float32 GetAreaRatio() const; - - /// Build an optimal tree. Very expensive. For testing. - void RebuildBottomUp(); - - /// Shift the world origin. Useful for large worlds. - /// The shift formula is: position -= newOrigin - /// @param newOrigin the new origin with respect to the old origin - void ShiftOrigin(const b2Vec2& newOrigin); - -private: - - int32 AllocateNode(); - void FreeNode(int32 node); - - void InsertLeaf(int32 node); - void RemoveLeaf(int32 node); - - int32 Balance(int32 index); - - int32 ComputeHeight() const; - int32 ComputeHeight(int32 nodeId) const; - - void ValidateStructure(int32 index) const; - void ValidateMetrics(int32 index) const; - - int32 m_root; - - b2TreeNode* m_nodes; - int32 m_nodeCount; - int32 m_nodeCapacity; - - int32 m_freeList; - - /// This is used to incrementally traverse the tree for re-balancing. - uint32 m_path; - - int32 m_insertionCount; -}; - -inline void* b2DynamicTree::GetUserData(int32 proxyId) const -{ - b2Assert(0 <= proxyId && proxyId < m_nodeCapacity); - return m_nodes[proxyId].userData; -} - -inline const b2AABB& b2DynamicTree::GetFatAABB(int32 proxyId) const -{ - b2Assert(0 <= proxyId && proxyId < m_nodeCapacity); - return m_nodes[proxyId].aabb; -} - -template <typename T> -inline void b2DynamicTree::Query(T* callback, const b2AABB& aabb) const -{ - b2GrowableStack<int32, 256> stack; - stack.Push(m_root); - - while (stack.GetCount() > 0) - { - int32 nodeId = stack.Pop(); - if (nodeId == b2_nullNode) - { - continue; - } - - const b2TreeNode* node = m_nodes + nodeId; - - if (b2TestOverlap(node->aabb, aabb)) - { - if (node->IsLeaf()) - { - bool proceed = callback->QueryCallback(nodeId); - if (proceed == false) - { - return; - } - } - else - { - stack.Push(node->child1); - stack.Push(node->child2); - } - } - } -} - -template <typename T> -inline void b2DynamicTree::RayCast(T* callback, const b2RayCastInput& input) const -{ - b2Vec2 p1 = input.p1; - b2Vec2 p2 = input.p2; - b2Vec2 r = p2 - p1; - b2Assert(r.LengthSquared() > 0.0f); - r.Normalize(); - - // v is perpendicular to the segment. - b2Vec2 v = b2Cross(1.0f, r); - b2Vec2 abs_v = b2Abs(v); - - // Separating axis for segment (Gino, p80). - // |dot(v, p1 - c)| > dot(|v|, h) - - float32 maxFraction = input.maxFraction; - - // Build a bounding box for the segment. - b2AABB segmentAABB; - { - b2Vec2 t = p1 + maxFraction * (p2 - p1); - segmentAABB.lowerBound = b2Min(p1, t); - segmentAABB.upperBound = b2Max(p1, t); - } - - b2GrowableStack<int32, 256> stack; - stack.Push(m_root); - - while (stack.GetCount() > 0) - { - int32 nodeId = stack.Pop(); - if (nodeId == b2_nullNode) - { - continue; - } - - const b2TreeNode* node = m_nodes + nodeId; - - if (b2TestOverlap(node->aabb, segmentAABB) == false) - { - continue; - } - - // Separating axis for segment (Gino, p80). - // |dot(v, p1 - c)| > dot(|v|, h) - b2Vec2 c = node->aabb.GetCenter(); - b2Vec2 h = node->aabb.GetExtents(); - float32 separation = b2Abs(b2Dot(v, p1 - c)) - b2Dot(abs_v, h); - if (separation > 0.0f) - { - continue; - } - - if (node->IsLeaf()) - { - b2RayCastInput subInput; - subInput.p1 = input.p1; - subInput.p2 = input.p2; - subInput.maxFraction = maxFraction; - - float32 value = callback->RayCastCallback(subInput, nodeId); - - if (value == 0.0f) - { - // The client has terminated the ray cast. - return; - } - - if (value > 0.0f) - { - // Update segment bounding box. - maxFraction = value; - b2Vec2 t = p1 + maxFraction * (p2 - p1); - segmentAABB.lowerBound = b2Min(p1, t); - segmentAABB.upperBound = b2Max(p1, t); - } - } - else - { - stack.Push(node->child1); - stack.Push(node->child2); - } - } -} - -#endif |